diff --git a/src/algorithms/PVT/libs/monitor_pvt_udp_sink.cc b/src/algorithms/PVT/libs/monitor_pvt_udp_sink.cc
index d46259cc8..af039f276 100644
--- a/src/algorithms/PVT/libs/monitor_pvt_udp_sink.cc
+++ b/src/algorithms/PVT/libs/monitor_pvt_udp_sink.cc
@@ -34,7 +34,7 @@
 #include <iostream>
 #include <sstream>
 
-Monitor_Pvt_Udp_Sink::Monitor_Pvt_Udp_Sink(std::vector<std::string> addresses, const uint16_t& port) : socket{io_service}
+Monitor_Pvt_Udp_Sink::Monitor_Pvt_Udp_Sink(const std::vector<std::string>& addresses, const uint16_t& port) : socket{io_service}
 {
     for (auto address : addresses)
         {
diff --git a/src/algorithms/PVT/libs/monitor_pvt_udp_sink.h b/src/algorithms/PVT/libs/monitor_pvt_udp_sink.h
index bec163986..f8c6552ae 100644
--- a/src/algorithms/PVT/libs/monitor_pvt_udp_sink.h
+++ b/src/algorithms/PVT/libs/monitor_pvt_udp_sink.h
@@ -38,7 +38,7 @@
 class Monitor_Pvt_Udp_Sink
 {
 public:
-    Monitor_Pvt_Udp_Sink(std::vector<std::string> addresses, const uint16_t &port);
+    Monitor_Pvt_Udp_Sink(const std::vector<std::string>& addresses, const uint16_t& port);
     bool write_monitor_pvt(Monitor_Pvt monitor_pvt);
 
 private:
diff --git a/src/algorithms/PVT/libs/nmea_printer.cc b/src/algorithms/PVT/libs/nmea_printer.cc
index 3d4ebc74a..8f4122c58 100644
--- a/src/algorithms/PVT/libs/nmea_printer.cc
+++ b/src/algorithms/PVT/libs/nmea_printer.cc
@@ -269,7 +269,7 @@ bool Nmea_Printer::Print_Nmea_Line(const std::shared_ptr<rtklib_solver>& pvt_dat
 }
 
 
-char Nmea_Printer::checkSum(std::string sentence)
+char Nmea_Printer::checkSum(const std::string& sentence)
 {
     char check = 0;
     // iterate over the string, XOR each byte with the total sum:
diff --git a/src/algorithms/PVT/libs/nmea_printer.h b/src/algorithms/PVT/libs/nmea_printer.h
index 6e18d7451..b7373f45b 100644
--- a/src/algorithms/PVT/libs/nmea_printer.h
+++ b/src/algorithms/PVT/libs/nmea_printer.h
@@ -82,7 +82,7 @@ private:
     std::string get_UTC_NMEA_time(boost::posix_time::ptime d_position_UTC_time);
     std::string longitude_to_hm(double longitude);
     std::string latitude_to_hm(double lat);
-    char checkSum(std::string sentence);
+    char checkSum(const std::string& sentence);
     bool print_avg_pos;
     bool d_flag_nmea_output_file;
 };
diff --git a/src/algorithms/acquisition/adapters/beidou_b1i_pcps_acquisition.cc b/src/algorithms/acquisition/adapters/beidou_b1i_pcps_acquisition.cc
index 7ee2a7277..050e44eb4 100644
--- a/src/algorithms/acquisition/adapters/beidou_b1i_pcps_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/beidou_b1i_pcps_acquisition.cc
@@ -39,15 +39,16 @@
 #include "gnss_sdr_flags.h"
 #include <boost/math/distributions/exponential.hpp>
 #include <glog/logging.h>
+#include <utility>
 
 
 using google::LogMessage;
 
 BeidouB1iPcpsAcquisition::BeidouB1iPcpsAcquisition(
     ConfigurationInterface* configuration,
-    const std::string& role,
+    std::string role,
     unsigned int in_streams,
-    unsigned int out_streams) : role_(role),
+    unsigned int out_streams) : role_(std::move(role)),
                                 in_streams_(in_streams),
                                 out_streams_(out_streams)
 {
diff --git a/src/algorithms/acquisition/adapters/beidou_b1i_pcps_acquisition.h b/src/algorithms/acquisition/adapters/beidou_b1i_pcps_acquisition.h
index 334aff555..3b6c185a8 100644
--- a/src/algorithms/acquisition/adapters/beidou_b1i_pcps_acquisition.h
+++ b/src/algorithms/acquisition/adapters/beidou_b1i_pcps_acquisition.h
@@ -55,7 +55,7 @@ class BeidouB1iPcpsAcquisition : public AcquisitionInterface
 {
 public:
     BeidouB1iPcpsAcquisition(ConfigurationInterface* configuration,
-        const std::string& role, unsigned int in_streams,
+        std::string role, unsigned int in_streams,
         unsigned int out_streams);
 
     virtual ~BeidouB1iPcpsAcquisition();
diff --git a/src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition.cc b/src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition.cc
index 5f4137f7d..8e81cc18f 100644
--- a/src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition.cc
@@ -37,6 +37,7 @@
 #include "gnss_sdr_flags.h"
 #include <boost/math/distributions/exponential.hpp>
 #include <glog/logging.h>
+#include <utility>
 
 
 using google::LogMessage;
@@ -44,9 +45,9 @@ using google::LogMessage;
 
 GalileoE1PcpsAmbiguousAcquisition::GalileoE1PcpsAmbiguousAcquisition(
     ConfigurationInterface* configuration,
-    const std::string& role,
+    std::string role,
     unsigned int in_streams,
-    unsigned int out_streams) : role_(role),
+    unsigned int out_streams) : role_(std::move(role)),
                                 in_streams_(in_streams),
                                 out_streams_(out_streams)
 {
diff --git a/src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition.h b/src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition.h
index ee4538022..13dd5fe4a 100644
--- a/src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition.h
+++ b/src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition.h
@@ -52,7 +52,7 @@ class GalileoE1PcpsAmbiguousAcquisition : public AcquisitionInterface
 {
 public:
     GalileoE1PcpsAmbiguousAcquisition(ConfigurationInterface* configuration,
-        const std::string& role,
+        std::string role,
         unsigned int in_streams,
         unsigned int out_streams);
 
diff --git a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition.cc b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition.cc
index e27f37581..9d6d74d86 100644
--- a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition.cc
@@ -41,6 +41,7 @@
 #include "gps_sdr_signal_processing.h"
 #include <boost/math/distributions/exponential.hpp>
 #include <glog/logging.h>
+#include <utility>
 
 
 using google::LogMessage;
@@ -48,9 +49,9 @@ using google::LogMessage;
 
 GpsL1CaPcpsAcquisition::GpsL1CaPcpsAcquisition(
     ConfigurationInterface* configuration,
-    const std::string& role,
+    std::string role,
     unsigned int in_streams,
-    unsigned int out_streams) : role_(role),
+    unsigned int out_streams) : role_(std::move(role)),
                                 in_streams_(in_streams),
                                 out_streams_(out_streams)
 {
diff --git a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition.h b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition.h
index efca26bdd..ed9767a81 100644
--- a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition.h
+++ b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition.h
@@ -56,7 +56,7 @@ class GpsL1CaPcpsAcquisition : public AcquisitionInterface
 {
 public:
     GpsL1CaPcpsAcquisition(ConfigurationInterface* configuration,
-        const std::string& role,
+        std::string role,
         unsigned int in_streams,
         unsigned int out_streams);
 
diff --git a/src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition.cc b/src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition.cc
index 00fcb7624..9cc6f5633 100644
--- a/src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition.cc
@@ -39,6 +39,7 @@
 #include "gps_l2c_signal.h"
 #include <boost/math/distributions/exponential.hpp>
 #include <glog/logging.h>
+#include <utility>
 
 
 using google::LogMessage;
@@ -46,9 +47,9 @@ using google::LogMessage;
 
 GpsL2MPcpsAcquisition::GpsL2MPcpsAcquisition(
     ConfigurationInterface* configuration,
-    const std::string& role,
+    std::string role,
     unsigned int in_streams,
-    unsigned int out_streams) : role_(role),
+    unsigned int out_streams) : role_(std::move(role)),
                                 in_streams_(in_streams),
                                 out_streams_(out_streams)
 {
diff --git a/src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition.h b/src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition.h
index da1c7ef6e..f296e6304 100644
--- a/src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition.h
+++ b/src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition.h
@@ -53,7 +53,7 @@ class GpsL2MPcpsAcquisition : public AcquisitionInterface
 {
 public:
     GpsL2MPcpsAcquisition(ConfigurationInterface* configuration,
-        const std::string& role,
+        std::string role,
         unsigned int in_streams,
         unsigned int out_streams);
 
diff --git a/src/algorithms/acquisition/adapters/gps_l5i_pcps_acquisition.cc b/src/algorithms/acquisition/adapters/gps_l5i_pcps_acquisition.cc
index d3b722823..6d36db29b 100644
--- a/src/algorithms/acquisition/adapters/gps_l5i_pcps_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/gps_l5i_pcps_acquisition.cc
@@ -39,6 +39,7 @@
 #include "gps_l5_signal.h"
 #include <boost/math/distributions/exponential.hpp>
 #include <glog/logging.h>
+#include <utility>
 
 
 using google::LogMessage;
@@ -46,9 +47,9 @@ using google::LogMessage;
 
 GpsL5iPcpsAcquisition::GpsL5iPcpsAcquisition(
     ConfigurationInterface* configuration,
-    const std::string& role,
+    std::string role,
     unsigned int in_streams,
-    unsigned int out_streams) : role_(role),
+    unsigned int out_streams) : role_(std::move(role)),
                                 in_streams_(in_streams),
                                 out_streams_(out_streams)
 {
diff --git a/src/algorithms/acquisition/adapters/gps_l5i_pcps_acquisition.h b/src/algorithms/acquisition/adapters/gps_l5i_pcps_acquisition.h
index af8cabb81..02f48d11d 100644
--- a/src/algorithms/acquisition/adapters/gps_l5i_pcps_acquisition.h
+++ b/src/algorithms/acquisition/adapters/gps_l5i_pcps_acquisition.h
@@ -53,7 +53,7 @@ class GpsL5iPcpsAcquisition : public AcquisitionInterface
 {
 public:
     GpsL5iPcpsAcquisition(ConfigurationInterface* configuration,
-        const std::string& role,
+        std::string role,
         unsigned int in_streams,
         unsigned int out_streams);
 
diff --git a/src/algorithms/acquisition/gnuradio_blocks/galileo_e5a_noncoherent_iq_acquisition_caf_cc.cc b/src/algorithms/acquisition/gnuradio_blocks/galileo_e5a_noncoherent_iq_acquisition_caf_cc.cc
index c6f14d597..a3579ee23 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/galileo_e5a_noncoherent_iq_acquisition_caf_cc.cc
+++ b/src/algorithms/acquisition/gnuradio_blocks/galileo_e5a_noncoherent_iq_acquisition_caf_cc.cc
@@ -53,7 +53,7 @@ galileo_e5a_noncoherentIQ_acquisition_caf_cc_sptr galileo_e5a_noncoherentIQ_make
     int samples_per_ms, int samples_per_code,
     bool bit_transition_flag,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     bool both_signal_components_,
     int CAF_window_hz_,
     int Zero_padding_)
@@ -73,7 +73,7 @@ galileo_e5a_noncoherentIQ_acquisition_caf_cc::galileo_e5a_noncoherentIQ_acquisit
     int samples_per_code,
     bool bit_transition_flag,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     bool both_signal_components_,
     int CAF_window_hz_,
     int Zero_padding_) : gr::block("galileo_e5a_noncoherentIQ_acquisition_caf_cc",
diff --git a/src/algorithms/acquisition/gnuradio_blocks/galileo_e5a_noncoherent_iq_acquisition_caf_cc.h b/src/algorithms/acquisition/gnuradio_blocks/galileo_e5a_noncoherent_iq_acquisition_caf_cc.h
index c95a74b82..7ef061db4 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/galileo_e5a_noncoherent_iq_acquisition_caf_cc.h
+++ b/src/algorithms/acquisition/gnuradio_blocks/galileo_e5a_noncoherent_iq_acquisition_caf_cc.h
@@ -56,7 +56,7 @@ galileo_e5a_noncoherentIQ_make_acquisition_caf_cc(unsigned int sampled_ms,
     int samples_per_ms, int samples_per_code,
     bool bit_transition_flag,
     bool dump,
-    std::string dump_filename,
+    const std::string& dump_filename,
     bool both_signal_components_,
     int CAF_window_hz_,
     int Zero_padding_);
@@ -78,7 +78,7 @@ private:
         int samples_per_ms, int samples_per_code,
         bool bit_transition_flag,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         bool both_signal_components_,
         int CAF_window_hz_,
         int Zero_padding_);
@@ -90,7 +90,7 @@ private:
         int samples_per_ms, int samples_per_code,
         bool bit_transition_flag,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         bool both_signal_components_,
         int CAF_window_hz_,
         int Zero_padding_);
diff --git a/src/algorithms/acquisition/gnuradio_blocks/galileo_pcps_8ms_acquisition_cc.cc b/src/algorithms/acquisition/gnuradio_blocks/galileo_pcps_8ms_acquisition_cc.cc
index cb528d0b1..06a249bb5 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/galileo_pcps_8ms_acquisition_cc.cc
+++ b/src/algorithms/acquisition/gnuradio_blocks/galileo_pcps_8ms_acquisition_cc.cc
@@ -47,7 +47,7 @@ galileo_pcps_8ms_acquisition_cc_sptr galileo_pcps_8ms_make_acquisition_cc(
     int64_t fs_in,
     int32_t samples_per_ms,
     int32_t samples_per_code,
-    bool dump, std::string dump_filename)
+    bool dump, const std::string &dump_filename)
 {
     return galileo_pcps_8ms_acquisition_cc_sptr(
         new galileo_pcps_8ms_acquisition_cc(sampled_ms, max_dwells, doppler_max, fs_in, samples_per_ms,
@@ -63,9 +63,9 @@ galileo_pcps_8ms_acquisition_cc::galileo_pcps_8ms_acquisition_cc(
     int32_t samples_per_ms,
     int32_t samples_per_code,
     bool dump,
-    std::string dump_filename) : gr::block("galileo_pcps_8ms_acquisition_cc",
-                                     gr::io_signature::make(1, 1, sizeof(gr_complex) * sampled_ms * samples_per_ms),
-                                     gr::io_signature::make(0, 0, sizeof(gr_complex) * sampled_ms * samples_per_ms))
+    const std::string &dump_filename) : gr::block("galileo_pcps_8ms_acquisition_cc",
+                                            gr::io_signature::make(1, 1, sizeof(gr_complex) * sampled_ms * samples_per_ms),
+                                            gr::io_signature::make(0, 0, sizeof(gr_complex) * sampled_ms * samples_per_ms))
 {
     this->message_port_register_out(pmt::mp("events"));
     d_sample_counter = 0ULL;  // SAMPLE COUNTER
diff --git a/src/algorithms/acquisition/gnuradio_blocks/galileo_pcps_8ms_acquisition_cc.h b/src/algorithms/acquisition/gnuradio_blocks/galileo_pcps_8ms_acquisition_cc.h
index 0c1b81e20..372ce1fd6 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/galileo_pcps_8ms_acquisition_cc.h
+++ b/src/algorithms/acquisition/gnuradio_blocks/galileo_pcps_8ms_acquisition_cc.h
@@ -51,7 +51,7 @@ galileo_pcps_8ms_make_acquisition_cc(uint32_t sampled_ms,
     int32_t samples_per_ms,
     int32_t samples_per_code,
     bool dump,
-    std::string dump_filename);
+    const std::string& dump_filename);
 
 /*!
  * \brief This class implements a Parallel Code Phase Search Acquisition for
@@ -69,7 +69,7 @@ private:
         int32_t samples_per_ms,
         int32_t samples_per_code,
         bool dump,
-        std::string dump_filename);
+        const std::string& dump_filename);
 
     galileo_pcps_8ms_acquisition_cc(
         uint32_t sampled_ms,
@@ -79,7 +79,7 @@ private:
         int32_t samples_per_ms,
         int32_t samples_per_code,
         bool dump,
-        std::string dump_filename);
+        const std::string& dump_filename);
 
     void calculate_magnitudes(
         gr_complex* fft_begin,
diff --git a/src/algorithms/acquisition/gnuradio_blocks/pcps_assisted_acquisition_cc.cc b/src/algorithms/acquisition/gnuradio_blocks/pcps_assisted_acquisition_cc.cc
index 5e8100f59..e41af55c2 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/pcps_assisted_acquisition_cc.cc
+++ b/src/algorithms/acquisition/gnuradio_blocks/pcps_assisted_acquisition_cc.cc
@@ -49,7 +49,7 @@ using google::LogMessage;
 pcps_assisted_acquisition_cc_sptr pcps_make_assisted_acquisition_cc(
     int32_t max_dwells, uint32_t sampled_ms, int32_t doppler_max, int32_t doppler_min,
     int64_t fs_in, int32_t samples_per_ms, bool dump,
-    std::string dump_filename)
+    const std::string &dump_filename)
 {
     return pcps_assisted_acquisition_cc_sptr(
         new pcps_assisted_acquisition_cc(max_dwells, sampled_ms, doppler_max, doppler_min,
@@ -60,9 +60,9 @@ pcps_assisted_acquisition_cc_sptr pcps_make_assisted_acquisition_cc(
 pcps_assisted_acquisition_cc::pcps_assisted_acquisition_cc(
     int32_t max_dwells, uint32_t sampled_ms, int32_t doppler_max, int32_t doppler_min,
     int64_t fs_in, int32_t samples_per_ms, bool dump,
-    std::string dump_filename) : gr::block("pcps_assisted_acquisition_cc",
-                                     gr::io_signature::make(1, 1, sizeof(gr_complex)),
-                                     gr::io_signature::make(0, 0, sizeof(gr_complex)))
+    const std::string &dump_filename) : gr::block("pcps_assisted_acquisition_cc",
+                                            gr::io_signature::make(1, 1, sizeof(gr_complex)),
+                                            gr::io_signature::make(0, 0, sizeof(gr_complex)))
 {
     this->message_port_register_out(pmt::mp("events"));
     d_sample_counter = 0ULL;  // SAMPLE COUNTER
diff --git a/src/algorithms/acquisition/gnuradio_blocks/pcps_assisted_acquisition_cc.h b/src/algorithms/acquisition/gnuradio_blocks/pcps_assisted_acquisition_cc.h
index b27f920df..8cfff7f41 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/pcps_assisted_acquisition_cc.h
+++ b/src/algorithms/acquisition/gnuradio_blocks/pcps_assisted_acquisition_cc.h
@@ -67,7 +67,7 @@ pcps_make_assisted_acquisition_cc(
     int32_t doppler_min,
     int64_t fs_in,
     int32_t samples_per_ms,
-    bool dump, std::string dump_filename);
+    bool dump, const std::string& dump_filename);
 
 /*!
  * \brief This class implements a Parallel Code Phase Search Acquisition.
@@ -82,12 +82,12 @@ private:
     pcps_make_assisted_acquisition_cc(int32_t max_dwells, uint32_t sampled_ms,
         int32_t doppler_max, int32_t doppler_min, int64_t fs_in,
         int32_t samples_per_ms, bool dump,
-        std::string dump_filename);
+        const std::string& dump_filename);
 
     pcps_assisted_acquisition_cc(int32_t max_dwells, uint32_t sampled_ms,
         int32_t doppler_max, int32_t doppler_min, int64_t fs_in,
         int32_t samples_per_ms, bool dump,
-        std::string dump_filename);
+        const std::string& dump_filename);
 
     void calculate_magnitudes(gr_complex* fft_begin, int32_t doppler_shift,
         int32_t doppler_offset);
diff --git a/src/algorithms/acquisition/gnuradio_blocks/pcps_cccwsr_acquisition_cc.cc b/src/algorithms/acquisition/gnuradio_blocks/pcps_cccwsr_acquisition_cc.cc
index 17082ae25..0d8609934 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/pcps_cccwsr_acquisition_cc.cc
+++ b/src/algorithms/acquisition/gnuradio_blocks/pcps_cccwsr_acquisition_cc.cc
@@ -53,7 +53,7 @@ pcps_cccwsr_acquisition_cc_sptr pcps_cccwsr_make_acquisition_cc(
     int64_t fs_in,
     int32_t samples_per_ms,
     int32_t samples_per_code,
-    bool dump, std::string dump_filename)
+    bool dump, const std::string &dump_filename)
 {
     return pcps_cccwsr_acquisition_cc_sptr(
         new pcps_cccwsr_acquisition_cc(sampled_ms, max_dwells, doppler_max, fs_in,
@@ -69,9 +69,9 @@ pcps_cccwsr_acquisition_cc::pcps_cccwsr_acquisition_cc(
     int32_t samples_per_ms,
     int32_t samples_per_code,
     bool dump,
-    std::string dump_filename) : gr::block("pcps_cccwsr_acquisition_cc",
-                                     gr::io_signature::make(1, 1, sizeof(gr_complex) * sampled_ms * samples_per_ms),
-                                     gr::io_signature::make(0, 0, sizeof(gr_complex) * sampled_ms * samples_per_ms))
+    const std::string &dump_filename) : gr::block("pcps_cccwsr_acquisition_cc",
+                                            gr::io_signature::make(1, 1, sizeof(gr_complex) * sampled_ms * samples_per_ms),
+                                            gr::io_signature::make(0, 0, sizeof(gr_complex) * sampled_ms * samples_per_ms))
 {
     this->message_port_register_out(pmt::mp("events"));
     d_sample_counter = 0ULL;  // SAMPLE COUNTER
diff --git a/src/algorithms/acquisition/gnuradio_blocks/pcps_cccwsr_acquisition_cc.h b/src/algorithms/acquisition/gnuradio_blocks/pcps_cccwsr_acquisition_cc.h
index b1edf0106..8776ab37f 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/pcps_cccwsr_acquisition_cc.h
+++ b/src/algorithms/acquisition/gnuradio_blocks/pcps_cccwsr_acquisition_cc.h
@@ -58,7 +58,7 @@ pcps_cccwsr_make_acquisition_cc(
     int32_t samples_per_ms,
     int32_t samples_per_code,
     bool dump,
-    std::string dump_filename);
+    const std::string& dump_filename);
 
 /*!
  * \brief This class implements a Parallel Code Phase Search Acquisition with
@@ -71,12 +71,12 @@ private:
     pcps_cccwsr_make_acquisition_cc(uint32_t sampled_ms, uint32_t max_dwells,
         uint32_t doppler_max, int64_t fs_in,
         int32_t samples_per_ms, int32_t samples_per_code,
-        bool dump, std::string dump_filename);
+        bool dump, const std::string& dump_filename);
 
     pcps_cccwsr_acquisition_cc(uint32_t sampled_ms, uint32_t max_dwells,
         uint32_t doppler_max, int64_t fs_in,
         int32_t samples_per_ms, int32_t samples_per_code,
-        bool dump, std::string dump_filename);
+        bool dump, const std::string& dump_filename);
 
     void calculate_magnitudes(gr_complex* fft_begin, int32_t doppler_shift,
         int32_t doppler_offset);
diff --git a/src/algorithms/acquisition/gnuradio_blocks/pcps_quicksync_acquisition_cc.cc b/src/algorithms/acquisition/gnuradio_blocks/pcps_quicksync_acquisition_cc.cc
index a55b352c9..e43f0d079 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/pcps_quicksync_acquisition_cc.cc
+++ b/src/algorithms/acquisition/gnuradio_blocks/pcps_quicksync_acquisition_cc.cc
@@ -52,7 +52,7 @@ pcps_quicksync_acquisition_cc_sptr pcps_quicksync_make_acquisition_cc(
     int32_t samples_per_code,
     bool bit_transition_flag,
     bool dump,
-    std::string dump_filename)
+    const std::string& dump_filename)
 {
     return pcps_quicksync_acquisition_cc_sptr(
         new pcps_quicksync_acquisition_cc(
@@ -72,9 +72,9 @@ pcps_quicksync_acquisition_cc::pcps_quicksync_acquisition_cc(
     int32_t samples_per_ms, int32_t samples_per_code,
     bool bit_transition_flag,
     bool dump,
-    std::string dump_filename) : gr::block("pcps_quicksync_acquisition_cc",
-                                     gr::io_signature::make(1, 1, (sizeof(gr_complex) * sampled_ms * samples_per_ms)),
-                                     gr::io_signature::make(0, 0, (sizeof(gr_complex) * sampled_ms * samples_per_ms)))
+    const std::string& dump_filename) : gr::block("pcps_quicksync_acquisition_cc",
+                                            gr::io_signature::make(1, 1, (sizeof(gr_complex) * sampled_ms * samples_per_ms)),
+                                            gr::io_signature::make(0, 0, (sizeof(gr_complex) * sampled_ms * samples_per_ms)))
 {
     this->message_port_register_out(pmt::mp("events"));
     d_sample_counter = 0ULL;  // SAMPLE COUNTER
diff --git a/src/algorithms/acquisition/gnuradio_blocks/pcps_quicksync_acquisition_cc.h b/src/algorithms/acquisition/gnuradio_blocks/pcps_quicksync_acquisition_cc.h
index cf24625a5..8e41d903d 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/pcps_quicksync_acquisition_cc.h
+++ b/src/algorithms/acquisition/gnuradio_blocks/pcps_quicksync_acquisition_cc.h
@@ -76,7 +76,7 @@ pcps_quicksync_make_acquisition_cc(
     int32_t samples_per_code,
     bool bit_transition_flag,
     bool dump,
-    std::string dump_filename);
+    const std::string& dump_filename);
 
 /*!
  * \brief This class implements a Parallel Code Phase Search Acquisition with
@@ -95,7 +95,7 @@ private:
         int32_t samples_per_ms, int32_t samples_per_code,
         bool bit_transition_flag,
         bool dump,
-        std::string dump_filename);
+        const std::string& dump_filename);
 
     pcps_quicksync_acquisition_cc(uint32_t folding_factor,
         uint32_t sampled_ms, uint32_t max_dwells,
@@ -103,7 +103,7 @@ private:
         int32_t samples_per_ms, int32_t samples_per_code,
         bool bit_transition_flag,
         bool dump,
-        std::string dump_filename);
+        const std::string& dump_filename);
 
     void calculate_magnitudes(gr_complex* fft_begin, int32_t doppler_shift,
         int32_t doppler_offset);
diff --git a/src/algorithms/acquisition/gnuradio_blocks/pcps_tong_acquisition_cc.cc b/src/algorithms/acquisition/gnuradio_blocks/pcps_tong_acquisition_cc.cc
index 7fc685028..72271cefc 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/pcps_tong_acquisition_cc.cc
+++ b/src/algorithms/acquisition/gnuradio_blocks/pcps_tong_acquisition_cc.cc
@@ -69,7 +69,7 @@ pcps_tong_acquisition_cc_sptr pcps_tong_make_acquisition_cc(
     uint32_t tong_init_val,
     uint32_t tong_max_val,
     uint32_t tong_max_dwells,
-    bool dump, std::string dump_filename)
+    bool dump, const std::string &dump_filename)
 {
     return pcps_tong_acquisition_cc_sptr(
         new pcps_tong_acquisition_cc(sampled_ms, doppler_max, fs_in, samples_per_ms, samples_per_code,
@@ -87,9 +87,9 @@ pcps_tong_acquisition_cc::pcps_tong_acquisition_cc(
     uint32_t tong_max_val,
     uint32_t tong_max_dwells,
     bool dump,
-    std::string dump_filename) : gr::block("pcps_tong_acquisition_cc",
-                                     gr::io_signature::make(1, 1, sizeof(gr_complex) * sampled_ms * samples_per_ms),
-                                     gr::io_signature::make(0, 0, sizeof(gr_complex) * sampled_ms * samples_per_ms))
+    const std::string &dump_filename) : gr::block("pcps_tong_acquisition_cc",
+                                            gr::io_signature::make(1, 1, sizeof(gr_complex) * sampled_ms * samples_per_ms),
+                                            gr::io_signature::make(0, 0, sizeof(gr_complex) * sampled_ms * samples_per_ms))
 {
     this->message_port_register_out(pmt::mp("events"));
     d_sample_counter = 0ULL;  // SAMPLE COUNTER
diff --git a/src/algorithms/acquisition/gnuradio_blocks/pcps_tong_acquisition_cc.h b/src/algorithms/acquisition/gnuradio_blocks/pcps_tong_acquisition_cc.h
index e2443fa33..027f5d58a 100644
--- a/src/algorithms/acquisition/gnuradio_blocks/pcps_tong_acquisition_cc.h
+++ b/src/algorithms/acquisition/gnuradio_blocks/pcps_tong_acquisition_cc.h
@@ -74,7 +74,7 @@ pcps_tong_make_acquisition_cc(
     uint32_t tong_max_val,
     uint32_t tong_max_dwells,
     bool dump,
-    std::string dump_filename);
+    const std::string& dump_filename);
 
 /*!
  * \brief This class implements a Parallel Code Phase Search Acquisition with
@@ -88,13 +88,13 @@ private:
         int64_t fs_in, int32_t samples_per_ms,
         int32_t samples_per_code, uint32_t tong_init_val,
         uint32_t tong_max_val, uint32_t tong_max_dwells,
-        bool dump, std::string dump_filename);
+        bool dump, const std::string& dump_filename);
 
     pcps_tong_acquisition_cc(uint32_t sampled_ms, uint32_t doppler_max,
         int64_t fs_in, int32_t samples_per_ms,
         int32_t samples_per_code, uint32_t tong_init_val,
         uint32_t tong_max_val, uint32_t tong_max_dwells,
-        bool dump, std::string dump_filename);
+        bool dump, const std::string& dump_filename);
 
     void calculate_magnitudes(gr_complex* fft_begin, int32_t doppler_shift,
         int32_t doppler_offset);
diff --git a/src/algorithms/signal_generator/gnuradio_blocks/signal_generator_c.cc b/src/algorithms/signal_generator/gnuradio_blocks/signal_generator_c.cc
index 84a90d555..378ef90cc 100644
--- a/src/algorithms/signal_generator/gnuradio_blocks/signal_generator_c.cc
+++ b/src/algorithms/signal_generator/gnuradio_blocks/signal_generator_c.cc
@@ -48,7 +48,7 @@
 * a boost shared_ptr. This is effectively the public constructor.
 */
 signal_generator_c_sptr
-signal_make_generator_c(std::vector<std::string> signal1, std::vector<std::string> system, const std::vector<unsigned int> &PRN,
+signal_make_generator_c(const std::vector<std::string> &signal1, const std::vector<std::string> &system, const std::vector<unsigned int> &PRN,
     const std::vector<float> &CN0_dB, const std::vector<float> &doppler_Hz,
     const std::vector<unsigned int> &delay_chips, const std::vector<unsigned int> &delay_sec, bool data_flag, bool noise_flag,
     unsigned int fs_in, unsigned int vector_length, float BW_BB)
diff --git a/src/algorithms/signal_generator/gnuradio_blocks/signal_generator_c.h b/src/algorithms/signal_generator/gnuradio_blocks/signal_generator_c.h
index 2201a849c..a57f2f1b3 100644
--- a/src/algorithms/signal_generator/gnuradio_blocks/signal_generator_c.h
+++ b/src/algorithms/signal_generator/gnuradio_blocks/signal_generator_c.h
@@ -61,7 +61,7 @@ using signal_generator_c_sptr = boost::shared_ptr<signal_generator_c>;
 * interface for creating new instances.
 */
 signal_generator_c_sptr
-signal_make_generator_c(std::vector<std::string> signal1, std::vector<std::string> system, const std::vector<unsigned int> &PRN,
+signal_make_generator_c(const std::vector<std::string> &signal1, const std::vector<std::string> &system, const std::vector<unsigned int> &PRN,
     const std::vector<float> &CN0_dB, const std::vector<float> &doppler_Hz,
     const std::vector<unsigned int> &delay_chips, const std::vector<unsigned int> &delay_sec, bool data_flag, bool noise_flag,
     unsigned int fs_in, unsigned int vector_length, float BW_BB);
@@ -80,7 +80,7 @@ private:
 
     /* Create the signal_generator_c object*/
     friend signal_generator_c_sptr
-    signal_make_generator_c(std::vector<std::string> signal1, std::vector<std::string> system, const std::vector<unsigned int> &PRN,
+    signal_make_generator_c(const std::vector<std::string> &signal1, const std::vector<std::string> &system, const std::vector<unsigned int> &PRN,
         const std::vector<float> &CN0_dB, const std::vector<float> &doppler_Hz,
         const std::vector<unsigned int> &delay_chips, const std::vector<unsigned int> &delay_sec, bool data_flag, bool noise_flag,
         unsigned int fs_in, unsigned int vector_length, float BW_BB);
diff --git a/src/algorithms/tracking/adapters/glonass_l1_ca_dll_pll_c_aid_tracking.cc b/src/algorithms/tracking/adapters/glonass_l1_ca_dll_pll_c_aid_tracking.cc
index e3ca80dbe..804f93148 100644
--- a/src/algorithms/tracking/adapters/glonass_l1_ca_dll_pll_c_aid_tracking.cc
+++ b/src/algorithms/tracking/adapters/glonass_l1_ca_dll_pll_c_aid_tracking.cc
@@ -42,14 +42,15 @@
 #include "configuration_interface.h"
 #include "gnss_sdr_flags.h"
 #include <glog/logging.h>
+#include <utility>
 
 
 using google::LogMessage;
 
 
 GlonassL1CaDllPllCAidTracking::GlonassL1CaDllPllCAidTracking(
-    ConfigurationInterface* configuration, const std::string& role,
-    unsigned int in_streams, unsigned int out_streams) : role_(role), in_streams_(in_streams), out_streams_(out_streams)
+    ConfigurationInterface* configuration, std::string role,
+    unsigned int in_streams, unsigned int out_streams) : role_(std::move(role)), in_streams_(in_streams), out_streams_(out_streams)
 {
     DLOG(INFO) << "role " << role;
     //################# CONFIGURATION PARAMETERS ########################
diff --git a/src/algorithms/tracking/adapters/glonass_l1_ca_dll_pll_c_aid_tracking.h b/src/algorithms/tracking/adapters/glonass_l1_ca_dll_pll_c_aid_tracking.h
index d50003964..5911b4288 100644
--- a/src/algorithms/tracking/adapters/glonass_l1_ca_dll_pll_c_aid_tracking.h
+++ b/src/algorithms/tracking/adapters/glonass_l1_ca_dll_pll_c_aid_tracking.h
@@ -54,7 +54,7 @@ class GlonassL1CaDllPllCAidTracking : public TrackingInterface
 {
 public:
     GlonassL1CaDllPllCAidTracking(ConfigurationInterface* configuration,
-        const std::string& role,
+        std::string role,
         unsigned int in_streams,
         unsigned int out_streams);
 
diff --git a/src/algorithms/tracking/adapters/glonass_l2_ca_dll_pll_c_aid_tracking.cc b/src/algorithms/tracking/adapters/glonass_l2_ca_dll_pll_c_aid_tracking.cc
index 419ccc462..091f68df4 100644
--- a/src/algorithms/tracking/adapters/glonass_l2_ca_dll_pll_c_aid_tracking.cc
+++ b/src/algorithms/tracking/adapters/glonass_l2_ca_dll_pll_c_aid_tracking.cc
@@ -40,14 +40,15 @@
 #include "configuration_interface.h"
 #include "gnss_sdr_flags.h"
 #include <glog/logging.h>
+#include <utility>
 
 
 using google::LogMessage;
 
 
 GlonassL2CaDllPllCAidTracking::GlonassL2CaDllPllCAidTracking(
-    ConfigurationInterface* configuration, const std::string& role,
-    unsigned int in_streams, unsigned int out_streams) : role_(role), in_streams_(in_streams), out_streams_(out_streams)
+    ConfigurationInterface* configuration, std::string role,
+    unsigned int in_streams, unsigned int out_streams) : role_(std::move(role)), in_streams_(in_streams), out_streams_(out_streams)
 {
     DLOG(INFO) << "role " << role;
     //################# CONFIGURATION PARAMETERS ########################
diff --git a/src/algorithms/tracking/adapters/glonass_l2_ca_dll_pll_c_aid_tracking.h b/src/algorithms/tracking/adapters/glonass_l2_ca_dll_pll_c_aid_tracking.h
index b5659c527..5946b8713 100644
--- a/src/algorithms/tracking/adapters/glonass_l2_ca_dll_pll_c_aid_tracking.h
+++ b/src/algorithms/tracking/adapters/glonass_l2_ca_dll_pll_c_aid_tracking.h
@@ -52,7 +52,7 @@ class GlonassL2CaDllPllCAidTracking : public TrackingInterface
 {
 public:
     GlonassL2CaDllPllCAidTracking(ConfigurationInterface* configuration,
-        const std::string& role,
+        std::string role,
         unsigned int in_streams,
         unsigned int out_streams);
 
diff --git a/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_c_aid_tracking.cc b/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_c_aid_tracking.cc
index 5531be4e0..af3dcff79 100644
--- a/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_c_aid_tracking.cc
+++ b/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_c_aid_tracking.cc
@@ -41,14 +41,15 @@
 #include "configuration_interface.h"
 #include "gnss_sdr_flags.h"
 #include <glog/logging.h>
+#include <utility>
 
 
 using google::LogMessage;
 
 
 GpsL1CaDllPllCAidTracking::GpsL1CaDllPllCAidTracking(
-    ConfigurationInterface* configuration, const std::string& role,
-    unsigned int in_streams, unsigned int out_streams) : role_(role), in_streams_(in_streams), out_streams_(out_streams)
+    ConfigurationInterface* configuration, std::string role,
+    unsigned int in_streams, unsigned int out_streams) : role_(std::move(role)), in_streams_(in_streams), out_streams_(out_streams)
 {
     DLOG(INFO) << "role " << role;
     //################# CONFIGURATION PARAMETERS ########################
diff --git a/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_c_aid_tracking.h b/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_c_aid_tracking.h
index a1c54aa46..d48474ead 100644
--- a/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_c_aid_tracking.h
+++ b/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_c_aid_tracking.h
@@ -53,7 +53,7 @@ class GpsL1CaDllPllCAidTracking : public TrackingInterface
 {
 public:
     GpsL1CaDllPllCAidTracking(ConfigurationInterface* configuration,
-        const std::string& role,
+        std::string role,
         unsigned int in_streams,
         unsigned int out_streams);
 
diff --git a/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_c_aid_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_c_aid_tracking_cc.cc
index 21a040646..a3d70f0e8 100644
--- a/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_c_aid_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_c_aid_tracking_cc.cc
@@ -65,7 +65,7 @@ glonass_l1_ca_dll_pll_c_aid_make_tracking_cc(
     int64_t fs_in,
     uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float pll_bw_narrow_hz,
@@ -88,7 +88,7 @@ void glonass_l1_ca_dll_pll_c_aid_tracking_cc::forecast(int noutput_items,
 }
 
 
-void glonass_l1_ca_dll_pll_c_aid_tracking_cc::msg_handler_preamble_index(pmt::pmt_t msg)
+void glonass_l1_ca_dll_pll_c_aid_tracking_cc::msg_handler_preamble_index(const pmt::pmt_t &msg)
 {
     //pmt::print(msg);
     DLOG(INFO) << "Extended correlation enabled for Tracking CH " << d_channel << ": Satellite " << Gnss_Satellite(systemName[sys], d_acquisition_gnss_synchro->PRN);
@@ -105,7 +105,7 @@ glonass_l1_ca_dll_pll_c_aid_tracking_cc::glonass_l1_ca_dll_pll_c_aid_tracking_cc
     int64_t fs_in,
     uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float pll_bw_narrow_hz,
diff --git a/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_c_aid_tracking_cc.h b/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_c_aid_tracking_cc.h
index 2a5102942..7af766d60 100644
--- a/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_c_aid_tracking_cc.h
+++ b/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_c_aid_tracking_cc.h
@@ -59,7 +59,7 @@ glonass_l1_ca_dll_pll_c_aid_tracking_cc_sptr
 glonass_l1_ca_dll_pll_c_aid_make_tracking_cc(
     int64_t fs_in, uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string& dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float pll_bw_narrow_hz,
@@ -90,7 +90,7 @@ private:
     glonass_l1_ca_dll_pll_c_aid_make_tracking_cc(
         int64_t fs_in, uint32_t vector_length,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         float pll_bw_hz,
         float dll_bw_hz,
         float pll_bw_narrow_hz,
@@ -101,7 +101,7 @@ private:
     glonass_l1_ca_dll_pll_c_aid_tracking_cc(
         int64_t fs_in, uint32_t vector_length,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         float pll_bw_hz,
         float dll_bw_hz,
         float pll_bw_narrow_hz,
@@ -169,7 +169,7 @@ private:
     int32_t d_extend_correlation_ms;
     bool d_enable_extended_integration;
     bool d_preamble_synchronized;
-    void msg_handler_preamble_index(pmt::pmt_t msg);
+    void msg_handler_preamble_index(const pmt::pmt_t& msg);
 
     //Integration period in samples
     int32_t d_correlation_length_samples;
diff --git a/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_tracking_cc.cc
index 68d94e82f..469978680 100644
--- a/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_tracking_cc.cc
@@ -62,7 +62,7 @@ glonass_l1_ca_dll_pll_make_tracking_cc(
     int64_t fs_in,
     uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float early_late_space_chips)
@@ -86,7 +86,7 @@ Glonass_L1_Ca_Dll_Pll_Tracking_cc::Glonass_L1_Ca_Dll_Pll_Tracking_cc(
     int64_t fs_in,
     uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float early_late_space_chips) : gr::block("Glonass_L1_Ca_Dll_Pll_Tracking_cc", gr::io_signature::make(1, 1, sizeof(gr_complex)),
diff --git a/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_tracking_cc.h b/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_tracking_cc.h
index 15bc1c90f..80a04dedf 100644
--- a/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_tracking_cc.h
+++ b/src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_tracking_cc.h
@@ -56,7 +56,7 @@ glonass_l1_ca_dll_pll_tracking_cc_sptr
 glonass_l1_ca_dll_pll_make_tracking_cc(
     int64_t fs_in, uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string& dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float early_late_space_chips);
@@ -84,7 +84,7 @@ private:
     glonass_l1_ca_dll_pll_make_tracking_cc(
         int64_t fs_in, uint32_t vector_length,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         float pll_bw_hz,
         float dll_bw_hz,
         float early_late_space_chips);
@@ -92,7 +92,7 @@ private:
     Glonass_L1_Ca_Dll_Pll_Tracking_cc(
         int64_t fs_in, uint32_t vector_length,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         float pll_bw_hz,
         float dll_bw_hz,
         float early_late_space_chips);
diff --git a/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_c_aid_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_c_aid_tracking_cc.cc
index ae689ab8a..78f29b10f 100644
--- a/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_c_aid_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_c_aid_tracking_cc.cc
@@ -62,7 +62,7 @@ glonass_l2_ca_dll_pll_c_aid_make_tracking_cc(
     int64_t fs_in,
     uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float pll_bw_narrow_hz,
@@ -85,7 +85,7 @@ void glonass_l2_ca_dll_pll_c_aid_tracking_cc::forecast(int noutput_items,
 }
 
 
-void glonass_l2_ca_dll_pll_c_aid_tracking_cc::msg_handler_preamble_index(pmt::pmt_t msg)
+void glonass_l2_ca_dll_pll_c_aid_tracking_cc::msg_handler_preamble_index(const pmt::pmt_t &msg)
 {
     //pmt::print(msg);
     DLOG(INFO) << "Extended correlation enabled for Tracking CH " << d_channel << ": Satellite " << Gnss_Satellite(systemName[sys], d_acquisition_gnss_synchro->PRN);
@@ -102,7 +102,7 @@ glonass_l2_ca_dll_pll_c_aid_tracking_cc::glonass_l2_ca_dll_pll_c_aid_tracking_cc
     int64_t fs_in,
     uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float pll_bw_narrow_hz,
diff --git a/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_c_aid_tracking_cc.h b/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_c_aid_tracking_cc.h
index 1be8d3c7f..e71970e39 100644
--- a/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_c_aid_tracking_cc.h
+++ b/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_c_aid_tracking_cc.h
@@ -57,7 +57,7 @@ glonass_l2_ca_dll_pll_c_aid_tracking_cc_sptr
 glonass_l2_ca_dll_pll_c_aid_make_tracking_cc(
     int64_t fs_in, uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string& dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float pll_bw_narrow_hz,
@@ -88,7 +88,7 @@ private:
     glonass_l2_ca_dll_pll_c_aid_make_tracking_cc(
         int64_t fs_in, uint32_t vector_length,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         float pll_bw_hz,
         float dll_bw_hz,
         float pll_bw_narrow_hz,
@@ -99,7 +99,7 @@ private:
     glonass_l2_ca_dll_pll_c_aid_tracking_cc(
         int64_t fs_in, uint32_t vector_length,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         float pll_bw_hz,
         float dll_bw_hz,
         float pll_bw_narrow_hz,
@@ -167,7 +167,7 @@ private:
     int32_t d_extend_correlation_ms;
     bool d_enable_extended_integration;
     bool d_preamble_synchronized;
-    void msg_handler_preamble_index(pmt::pmt_t msg);
+    void msg_handler_preamble_index(const pmt::pmt_t& msg);
 
     //Integration period in samples
     int32_t d_correlation_length_samples;
diff --git a/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_tracking_cc.cc
index 8156ea09b..b8311938d 100644
--- a/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_tracking_cc.cc
@@ -62,7 +62,7 @@ glonass_l2_ca_dll_pll_make_tracking_cc(
     int64_t fs_in,
     uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float early_late_space_chips)
@@ -86,7 +86,7 @@ Glonass_L2_Ca_Dll_Pll_Tracking_cc::Glonass_L2_Ca_Dll_Pll_Tracking_cc(
     int64_t fs_in,
     uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float early_late_space_chips) : gr::block("Glonass_L2_Ca_Dll_Pll_Tracking_cc", gr::io_signature::make(1, 1, sizeof(gr_complex)),
diff --git a/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_tracking_cc.h b/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_tracking_cc.h
index 29f6bb077..20ebca8c2 100644
--- a/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_tracking_cc.h
+++ b/src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_tracking_cc.h
@@ -54,7 +54,7 @@ glonass_l2_ca_dll_pll_tracking_cc_sptr
 glonass_l2_ca_dll_pll_make_tracking_cc(
     int64_t fs_in, uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string& dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float early_late_space_chips);
@@ -82,7 +82,7 @@ private:
     glonass_l2_ca_dll_pll_make_tracking_cc(
         int64_t fs_in, uint32_t vector_length,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         float pll_bw_hz,
         float dll_bw_hz,
         float early_late_space_chips);
@@ -90,7 +90,7 @@ private:
     Glonass_L2_Ca_Dll_Pll_Tracking_cc(
         int64_t fs_in, uint32_t vector_length,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         float pll_bw_hz,
         float dll_bw_hz,
         float early_late_space_chips);
diff --git a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_cc.cc
index 45a890cbe..1cb3eab43 100644
--- a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_cc.cc
@@ -54,7 +54,7 @@ gps_l1_ca_dll_pll_c_aid_make_tracking_cc(
     int64_t fs_in,
     uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float pll_bw_narrow_hz,
@@ -77,7 +77,7 @@ void gps_l1_ca_dll_pll_c_aid_tracking_cc::forecast(int noutput_items,
 }
 
 
-void gps_l1_ca_dll_pll_c_aid_tracking_cc::msg_handler_preamble_index(pmt::pmt_t msg)
+void gps_l1_ca_dll_pll_c_aid_tracking_cc::msg_handler_preamble_index(const pmt::pmt_t &msg)
 {
     //pmt::print(msg);
     DLOG(INFO) << "Extended correlation enabled for Tracking CH " << d_channel << ": Satellite " << Gnss_Satellite(systemName[sys], d_acquisition_gnss_synchro->PRN);
@@ -94,7 +94,7 @@ gps_l1_ca_dll_pll_c_aid_tracking_cc::gps_l1_ca_dll_pll_c_aid_tracking_cc(
     int64_t fs_in,
     uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float pll_bw_narrow_hz,
diff --git a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_cc.h b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_cc.h
index ecbe2c15f..f35affeef 100644
--- a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_cc.h
+++ b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_cc.h
@@ -57,7 +57,7 @@ gps_l1_ca_dll_pll_c_aid_tracking_cc_sptr
 gps_l1_ca_dll_pll_c_aid_make_tracking_cc(
     int64_t fs_in, uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string& dump_filename,
     float pll_bw_hz,
     float dll_bw_hz,
     float pll_bw_narrow_hz,
@@ -88,7 +88,7 @@ private:
     gps_l1_ca_dll_pll_c_aid_make_tracking_cc(
         int64_t fs_in, uint32_t vector_length,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         float pll_bw_hz,
         float dll_bw_hz,
         float pll_bw_narrow_hz,
@@ -99,7 +99,7 @@ private:
     gps_l1_ca_dll_pll_c_aid_tracking_cc(
         int64_t fs_in, uint32_t vector_length,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         float pll_bw_hz,
         float dll_bw_hz,
         float pll_bw_narrow_hz,
@@ -163,7 +163,7 @@ private:
     int32_t d_extend_correlation_ms;
     bool d_enable_extended_integration;
     bool d_preamble_synchronized;
-    void msg_handler_preamble_index(pmt::pmt_t msg);
+    void msg_handler_preamble_index(const pmt::pmt_t& msg);
 
     //Integration period in samples
     int32_t d_correlation_length_samples;
diff --git a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_kf_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_kf_tracking_cc.cc
index 96c478a3f..15c806123 100644
--- a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_kf_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_kf_tracking_cc.cc
@@ -64,7 +64,7 @@ gps_l1_ca_kf_make_tracking_cc(
     int64_t fs_in,
     uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     float dll_bw_hz,
     float early_late_space_chips,
     bool bce_run,
@@ -95,7 +95,7 @@ Gps_L1_Ca_Kf_Tracking_cc::Gps_L1_Ca_Kf_Tracking_cc(
     int64_t fs_in,
     uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string &dump_filename,
     float dll_bw_hz,
     float early_late_space_chips,
     bool bce_run,
diff --git a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_kf_tracking_cc.h b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_kf_tracking_cc.h
index e4acf778b..91e4b4b47 100644
--- a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_kf_tracking_cc.h
+++ b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_kf_tracking_cc.h
@@ -60,7 +60,7 @@ gps_l1_ca_kf_make_tracking_cc(uint32_t order,
     int64_t if_freq,
     int64_t fs_in, uint32_t vector_length,
     bool dump,
-    std::string dump_filename,
+    const std::string& dump_filename,
     float pll_bw_hz,
     float early_late_space_chips,
     bool bce_run,
@@ -93,7 +93,7 @@ private:
         int64_t if_freq,
         int64_t fs_in, uint32_t vector_length,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         float dll_bw_hz,
         float early_late_space_chips,
         bool bce_run,
@@ -106,7 +106,7 @@ private:
         int64_t if_freq,
         int64_t fs_in, uint32_t vector_length,
         bool dump,
-        std::string dump_filename,
+        const std::string& dump_filename,
         float dll_bw_hz,
         float early_late_space_chips,
         bool bce_run,
diff --git a/src/core/libs/INIReader.cc b/src/core/libs/INIReader.cc
index 63c076b82..454986615 100644
--- a/src/core/libs/INIReader.cc
+++ b/src/core/libs/INIReader.cc
@@ -64,7 +64,7 @@ int INIReader::ParseError()
 }
 
 
-std::string INIReader::Get(const std::string& section, const std::string& name, std::string default_value)
+std::string INIReader::Get(const std::string& section, const std::string& name, const std::string& default_value)
 {
     std::string key = MakeKey(section, name);
     return _values.count(key) ? _values[key] : default_value;
diff --git a/src/core/libs/INIReader.h b/src/core/libs/INIReader.h
index bfe168bd9..1a9f0f3e5 100644
--- a/src/core/libs/INIReader.h
+++ b/src/core/libs/INIReader.h
@@ -67,7 +67,7 @@ public:
 
     //! Get a string value from INI file, returning default_value if not found.
     std::string Get(const std::string& section, const std::string& name,
-        std::string default_value);
+        const std::string& default_value);
 
     //! Get an integer (long) value from INI file, returning default_value if not found.
     int64_t GetInteger(const std::string& section, const std::string& name, int64_t default_value);
diff --git a/src/core/monitor/gnss_synchro_udp_sink.cc b/src/core/monitor/gnss_synchro_udp_sink.cc
index 54f489433..b07ee5d11 100644
--- a/src/core/monitor/gnss_synchro_udp_sink.cc
+++ b/src/core/monitor/gnss_synchro_udp_sink.cc
@@ -35,7 +35,7 @@
 #include <iostream>
 #include <sstream>
 
-Gnss_Synchro_Udp_Sink::Gnss_Synchro_Udp_Sink(std::vector<std::string> addresses, const uint16_t& port) : socket{io_service}
+Gnss_Synchro_Udp_Sink::Gnss_Synchro_Udp_Sink(const std::vector<std::string>& addresses, const uint16_t& port) : socket{io_service}
 {
     for (auto address : addresses)
         {
diff --git a/src/core/monitor/gnss_synchro_udp_sink.h b/src/core/monitor/gnss_synchro_udp_sink.h
index d72b2f18a..70aaf0c1e 100644
--- a/src/core/monitor/gnss_synchro_udp_sink.h
+++ b/src/core/monitor/gnss_synchro_udp_sink.h
@@ -42,7 +42,7 @@
 class Gnss_Synchro_Udp_Sink
 {
 public:
-    Gnss_Synchro_Udp_Sink(std::vector<std::string> addresses, const uint16_t& port);
+    Gnss_Synchro_Udp_Sink(const std::vector<std::string>& addresses, const uint16_t& port);
     bool write_gnss_synchro(const std::vector<Gnss_Synchro>& stocks);
 
 private:
diff --git a/src/core/receiver/gnss_flowgraph.cc b/src/core/receiver/gnss_flowgraph.cc
index 82cc49e09..95a954016 100644
--- a/src/core/receiver/gnss_flowgraph.cc
+++ b/src/core/receiver/gnss_flowgraph.cc
@@ -1340,7 +1340,7 @@ void GNSSFlowgraph::apply_action(unsigned int who, unsigned int what)
 }
 
 
-void GNSSFlowgraph::priorize_satellites(std::vector<std::pair<int, Gnss_Satellite>> visible_satellites)
+void GNSSFlowgraph::priorize_satellites(const std::vector<std::pair<int, Gnss_Satellite>>& visible_satellites)
 {
     size_t old_size;
     Gnss_Signal gs;
diff --git a/src/core/receiver/gnss_flowgraph.h b/src/core/receiver/gnss_flowgraph.h
index 67f86bc6b..4862ca181 100644
--- a/src/core/receiver/gnss_flowgraph.h
+++ b/src/core/receiver/gnss_flowgraph.h
@@ -141,7 +141,7 @@ public:
     /*!
      * \brief Priorize visible satellites in the specified vector
      */
-    void priorize_satellites(std::vector<std::pair<int, Gnss_Satellite>> visible_satellites);
+    void priorize_satellites(const std::vector<std::pair<int, Gnss_Satellite>>& visible_satellites);
 
 private:
     void init();  // Populates the SV PRN list available for acquisition and tracking
diff --git a/src/tests/unit-tests/signal-processing-blocks/acquisition/gps_l1_ca_pcps_acquisition_test.cc b/src/tests/unit-tests/signal-processing-blocks/acquisition/gps_l1_ca_pcps_acquisition_test.cc
index 5cc30eeb1..08102c802 100644
--- a/src/tests/unit-tests/signal-processing-blocks/acquisition/gps_l1_ca_pcps_acquisition_test.cc
+++ b/src/tests/unit-tests/signal-processing-blocks/acquisition/gps_l1_ca_pcps_acquisition_test.cc
@@ -70,7 +70,7 @@ class GpsL1CaPcpsAcquisitionTest_msg_rx : public gr::block
 {
 private:
     friend GpsL1CaPcpsAcquisitionTest_msg_rx_sptr GpsL1CaPcpsAcquisitionTest_msg_rx_make();
-    void msg_handler_events(pmt::pmt_t msg);
+    void msg_handler_events(const pmt::pmt_t &msg);
     GpsL1CaPcpsAcquisitionTest_msg_rx();
 
 public:
@@ -85,7 +85,7 @@ GpsL1CaPcpsAcquisitionTest_msg_rx_sptr GpsL1CaPcpsAcquisitionTest_msg_rx_make()
 }
 
 
-void GpsL1CaPcpsAcquisitionTest_msg_rx::msg_handler_events(pmt::pmt_t msg)
+void GpsL1CaPcpsAcquisitionTest_msg_rx::msg_handler_events(const pmt::pmt_t &msg)
 {
     try
         {
@@ -236,14 +236,14 @@ void GpsL1CaPcpsAcquisitionTest::plot_grid()
 }
 
 
-TEST_F(GpsL1CaPcpsAcquisitionTest, Instantiate)
+TEST_F(GpsL1CaPcpsAcquisitionTest /*unused*/, Instantiate /*unused*/)
 {
     init();
     boost::shared_ptr<GpsL1CaPcpsAcquisition> acquisition = boost::make_shared<GpsL1CaPcpsAcquisition>(config.get(), "Acquisition_1C", 1, 0);
 }
 
 
-TEST_F(GpsL1CaPcpsAcquisitionTest, ConnectAndRun)
+TEST_F(GpsL1CaPcpsAcquisitionTest /*unused*/, ConnectAndRun /*unused*/)
 {
     int fs_in = 4000000;
     int nsamples = 4000;
@@ -276,7 +276,7 @@ TEST_F(GpsL1CaPcpsAcquisitionTest, ConnectAndRun)
 }
 
 
-TEST_F(GpsL1CaPcpsAcquisitionTest, ValidationOfResults)
+TEST_F(GpsL1CaPcpsAcquisitionTest /*unused*/, ValidationOfResults /*unused*/)
 {
     std::chrono::time_point<std::chrono::system_clock> start, end;
     std::chrono::duration<double> elapsed_seconds(0.0);