diff --git a/src/main/java/dan200/computercraft/shared/network/NetworkHandler.java b/src/main/java/dan200/computercraft/shared/network/NetworkHandler.java
index a2ac3451e..3d4fd5143 100644
--- a/src/main/java/dan200/computercraft/shared/network/NetworkHandler.java
+++ b/src/main/java/dan200/computercraft/shared/network/NetworkHandler.java
@@ -43,17 +43,17 @@ public static void setup()
             .simpleChannel();
 
         // Server messages
-        registerMainThread( 0, NetworkDirection.PLAY_TO_SERVER, ComputerActionServerMessage::new );
-        registerMainThread( 1, NetworkDirection.PLAY_TO_SERVER, QueueEventServerMessage::new );
-        registerMainThread( 2, NetworkDirection.PLAY_TO_SERVER, RequestComputerMessage::new );
-        registerMainThread( 3, NetworkDirection.PLAY_TO_SERVER, KeyEventServerMessage::new );
-        registerMainThread( 4, NetworkDirection.PLAY_TO_SERVER, MouseEventServerMessage::new );
+        registerMainThread( 0, NetworkDirection.PLAY_TO_SERVER, ComputerActionServerMessage.class, ComputerActionServerMessage::new );
+        registerMainThread( 1, NetworkDirection.PLAY_TO_SERVER, QueueEventServerMessage.class, QueueEventServerMessage::new );
+        registerMainThread( 2, NetworkDirection.PLAY_TO_SERVER, RequestComputerMessage.class, RequestComputerMessage::new );
+        registerMainThread( 3, NetworkDirection.PLAY_TO_SERVER, KeyEventServerMessage.class, KeyEventServerMessage::new );
+        registerMainThread( 4, NetworkDirection.PLAY_TO_SERVER, MouseEventServerMessage.class, MouseEventServerMessage::new );
 
         // Client messages
-        registerMainThread( 10, NetworkDirection.PLAY_TO_CLIENT, ChatTableClientMessage::new );
-        registerMainThread( 11, NetworkDirection.PLAY_TO_CLIENT, ComputerDataClientMessage::new );
-        registerMainThread( 12, NetworkDirection.PLAY_TO_CLIENT, ComputerDeletedClientMessage::new );
-        registerMainThread( 13, NetworkDirection.PLAY_TO_CLIENT, ComputerTerminalClientMessage::new );
+        registerMainThread( 10, NetworkDirection.PLAY_TO_CLIENT, ChatTableClientMessage.class, ChatTableClientMessage::new );
+        registerMainThread( 11, NetworkDirection.PLAY_TO_CLIENT, ComputerDataClientMessage.class, ComputerDataClientMessage::new );
+        registerMainThread( 12, NetworkDirection.PLAY_TO_CLIENT, ComputerDeletedClientMessage.class, ComputerDeletedClientMessage::new );
+        registerMainThread( 13, NetworkDirection.PLAY_TO_CLIENT, ComputerTerminalClientMessage.class, ComputerTerminalClientMessage::new );
         registerMainThread( 14, NetworkDirection.PLAY_TO_CLIENT, PlayRecordClientMessage.class, PlayRecordClientMessage::new );
         registerMainThread( 15, NetworkDirection.PLAY_TO_CLIENT, MonitorClientMessage.class, MonitorClientMessage::new );
         registerMainThread( 16, NetworkDirection.PLAY_TO_CLIENT, SpeakerPlayClientMessage.class, SpeakerPlayClientMessage::new );
@@ -90,24 +90,6 @@ public static void sendToAllTracking( NetworkMessage packet, Chunk chunk )
         network.send( PacketDistributor.TRACKING_CHUNK.with( () -> chunk ), packet );
     }
 
-    /**
-     * /**
-     * Register packet, and a thread-unsafe handler for it.
-     *
-     * @param <T>       The type of the packet to send.
-     * @param id        The identifier for this packet type.
-     * @param direction A network direction which will be asserted before any processing of this message occurs.
-     * @param factory   The factory for this type of packet.
-     */
-    private static <T extends NetworkMessage> void registerMainThread( int id, NetworkDirection direction, Supplier<T> factory )
-    {
-        registerMainThread( id, direction, getType( factory ), buf -> {
-            T instance = factory.get();
-            instance.fromBytes( buf );
-            return instance;
-        } );
-    }
-
     /**
      * /**
      * Register packet, and a thread-unsafe handler for it.
diff --git a/src/main/java/dan200/computercraft/shared/network/NetworkMessage.java b/src/main/java/dan200/computercraft/shared/network/NetworkMessage.java
index da49d0aa7..629223232 100644
--- a/src/main/java/dan200/computercraft/shared/network/NetworkMessage.java
+++ b/src/main/java/dan200/computercraft/shared/network/NetworkMessage.java
@@ -27,18 +27,6 @@ public interface NetworkMessage
      */
     void toBytes( @Nonnull PacketBuffer buf );
 
-    /**
-     * Read this packet from a buffer.
-     *
-     * This may be called on any thread, so this should be a pure operation.
-     *
-     * @param buf The buffer to read data from.
-     */
-    default void fromBytes( @Nonnull PacketBuffer buf )
-    {
-        throw new IllegalStateException( "Should have been registered using a \"from bytes\" method" );
-    }
-
     /**
      * Handle this {@link NetworkMessage}.
      *
diff --git a/src/main/java/dan200/computercraft/shared/network/client/ChatTableClientMessage.java b/src/main/java/dan200/computercraft/shared/network/client/ChatTableClientMessage.java
index b3baff2c6..1fb1a974f 100644
--- a/src/main/java/dan200/computercraft/shared/network/client/ChatTableClientMessage.java
+++ b/src/main/java/dan200/computercraft/shared/network/client/ChatTableClientMessage.java
@@ -16,7 +16,7 @@
 
 public class ChatTableClientMessage implements NetworkMessage
 {
-    private TableBuilder table;
+    private final TableBuilder table;
 
     public ChatTableClientMessage( TableBuilder table )
     {
@@ -24,32 +24,7 @@ public ChatTableClientMessage( TableBuilder table )
         this.table = table;
     }
 
-    public ChatTableClientMessage()
-    {
-    }
-
-    @Override
-    public void toBytes( @Nonnull PacketBuffer buf )
-    {
-        buf.writeVarInt( table.getId() );
-        buf.writeVarInt( table.getColumns() );
-        buf.writeBoolean( table.getHeaders() != null );
-        if( table.getHeaders() != null )
-        {
-            for( ITextComponent header : table.getHeaders() ) buf.writeComponent( header );
-        }
-
-        buf.writeVarInt( table.getRows().size() );
-        for( ITextComponent[] row : table.getRows() )
-        {
-            for( ITextComponent column : row ) buf.writeComponent( column );
-        }
-
-        buf.writeVarInt( table.getAdditional() );
-    }
-
-    @Override
-    public void fromBytes( @Nonnull PacketBuffer buf )
+    public ChatTableClientMessage( @Nonnull PacketBuffer buf )
     {
         int id = buf.readVarInt();
         int columns = buf.readVarInt();
@@ -77,6 +52,26 @@ public void fromBytes( @Nonnull PacketBuffer buf )
         this.table = table;
     }
 
+    @Override
+    public void toBytes( @Nonnull PacketBuffer buf )
+    {
+        buf.writeVarInt( table.getId() );
+        buf.writeVarInt( table.getColumns() );
+        buf.writeBoolean( table.getHeaders() != null );
+        if( table.getHeaders() != null )
+        {
+            for( ITextComponent header : table.getHeaders() ) buf.writeComponent( header );
+        }
+
+        buf.writeVarInt( table.getRows().size() );
+        for( ITextComponent[] row : table.getRows() )
+        {
+            for( ITextComponent column : row ) buf.writeComponent( column );
+        }
+
+        buf.writeVarInt( table.getAdditional() );
+    }
+
     @Override
     public void handle( NetworkEvent.Context context )
     {
diff --git a/src/main/java/dan200/computercraft/shared/network/client/ComputerClientMessage.java b/src/main/java/dan200/computercraft/shared/network/client/ComputerClientMessage.java
index ebdf2cc87..9623622b5 100644
--- a/src/main/java/dan200/computercraft/shared/network/client/ComputerClientMessage.java
+++ b/src/main/java/dan200/computercraft/shared/network/client/ComputerClientMessage.java
@@ -17,15 +17,16 @@
  */
 public abstract class ComputerClientMessage implements NetworkMessage
 {
-    private int instanceId;
+    private final int instanceId;
 
     public ComputerClientMessage( int instanceId )
     {
         this.instanceId = instanceId;
     }
 
-    public ComputerClientMessage()
+    public ComputerClientMessage( @Nonnull PacketBuffer buf )
     {
+        instanceId = buf.readVarInt();
     }
 
     public int getInstanceId()
@@ -39,12 +40,6 @@ public void toBytes( @Nonnull PacketBuffer buf )
         buf.writeVarInt( instanceId );
     }
 
-    @Override
-    public void fromBytes( @Nonnull PacketBuffer buf )
-    {
-        instanceId = buf.readVarInt();
-    }
-
     public ClientComputer getComputer()
     {
         ClientComputer computer = ComputerCraft.clientComputerRegistry.get( instanceId );
diff --git a/src/main/java/dan200/computercraft/shared/network/client/ComputerDataClientMessage.java b/src/main/java/dan200/computercraft/shared/network/client/ComputerDataClientMessage.java
index d2ec44e87..d13be3198 100644
--- a/src/main/java/dan200/computercraft/shared/network/client/ComputerDataClientMessage.java
+++ b/src/main/java/dan200/computercraft/shared/network/client/ComputerDataClientMessage.java
@@ -18,8 +18,8 @@
  */
 public class ComputerDataClientMessage extends ComputerClientMessage
 {
-    private ComputerState state;
-    private CompoundNBT userData;
+    private final ComputerState state;
+    private final CompoundNBT userData;
 
     public ComputerDataClientMessage( ServerComputer computer )
     {
@@ -28,8 +28,11 @@ public ComputerDataClientMessage( ServerComputer computer )
         userData = computer.getUserData();
     }
 
-    public ComputerDataClientMessage()
+    public ComputerDataClientMessage( @Nonnull PacketBuffer buf )
     {
+        super( buf );
+        state = buf.readEnum( ComputerState.class );
+        userData = buf.readNbt();
     }
 
     @Override
@@ -40,14 +43,6 @@ public void toBytes( @Nonnull PacketBuffer buf )
         buf.writeNbt( userData );
     }
 
-    @Override
-    public void fromBytes( @Nonnull PacketBuffer buf )
-    {
-        super.fromBytes( buf );
-        state = buf.readEnum( ComputerState.class );
-        userData = buf.readNbt();
-    }
-
     @Override
     public void handle( NetworkEvent.Context context )
     {
diff --git a/src/main/java/dan200/computercraft/shared/network/client/ComputerDeletedClientMessage.java b/src/main/java/dan200/computercraft/shared/network/client/ComputerDeletedClientMessage.java
index 033e8f19a..22e6069d6 100644
--- a/src/main/java/dan200/computercraft/shared/network/client/ComputerDeletedClientMessage.java
+++ b/src/main/java/dan200/computercraft/shared/network/client/ComputerDeletedClientMessage.java
@@ -6,6 +6,7 @@
 package dan200.computercraft.shared.network.client;
 
 import dan200.computercraft.ComputerCraft;
+import net.minecraft.network.PacketBuffer;
 import net.minecraftforge.fml.network.NetworkEvent;
 
 public class ComputerDeletedClientMessage extends ComputerClientMessage
@@ -15,8 +16,9 @@ public ComputerDeletedClientMessage( int instanceId )
         super( instanceId );
     }
 
-    public ComputerDeletedClientMessage()
+    public ComputerDeletedClientMessage( PacketBuffer buffer )
     {
+        super( buffer );
     }
 
     @Override
diff --git a/src/main/java/dan200/computercraft/shared/network/client/ComputerTerminalClientMessage.java b/src/main/java/dan200/computercraft/shared/network/client/ComputerTerminalClientMessage.java
index 29eea30ee..824f007e6 100644
--- a/src/main/java/dan200/computercraft/shared/network/client/ComputerTerminalClientMessage.java
+++ b/src/main/java/dan200/computercraft/shared/network/client/ComputerTerminalClientMessage.java
@@ -12,7 +12,7 @@
 
 public class ComputerTerminalClientMessage extends ComputerClientMessage
 {
-    private TerminalState state;
+    private final TerminalState state;
 
     public ComputerTerminalClientMessage( int instanceId, TerminalState state )
     {
@@ -20,8 +20,10 @@ public ComputerTerminalClientMessage( int instanceId, TerminalState state )
         this.state = state;
     }
 
-    public ComputerTerminalClientMessage()
+    public ComputerTerminalClientMessage( @Nonnull PacketBuffer buf )
     {
+        super( buf );
+        state = new TerminalState( buf );
     }
 
     @Override
@@ -31,13 +33,6 @@ public void toBytes( @Nonnull PacketBuffer buf )
         state.write( buf );
     }
 
-    @Override
-    public void fromBytes( @Nonnull PacketBuffer buf )
-    {
-        super.fromBytes( buf );
-        state = new TerminalState( buf );
-    }
-
     @Override
     public void handle( NetworkEvent.Context context )
     {
diff --git a/src/main/java/dan200/computercraft/shared/network/server/ComputerActionServerMessage.java b/src/main/java/dan200/computercraft/shared/network/server/ComputerActionServerMessage.java
index 2590e33b7..f65559bba 100644
--- a/src/main/java/dan200/computercraft/shared/network/server/ComputerActionServerMessage.java
+++ b/src/main/java/dan200/computercraft/shared/network/server/ComputerActionServerMessage.java
@@ -13,7 +13,7 @@
 
 public class ComputerActionServerMessage extends ComputerServerMessage
 {
-    private Action action;
+    private final Action action;
 
     public ComputerActionServerMessage( int instanceId, Action action )
     {
@@ -21,8 +21,10 @@ public ComputerActionServerMessage( int instanceId, Action action )
         this.action = action;
     }
 
-    public ComputerActionServerMessage()
+    public ComputerActionServerMessage( @Nonnull PacketBuffer buf )
     {
+        super( buf );
+        action = buf.readEnum( Action.class );
     }
 
     @Override
@@ -32,13 +34,6 @@ public void toBytes( @Nonnull PacketBuffer buf )
         buf.writeEnum( action );
     }
 
-    @Override
-    public void fromBytes( @Nonnull PacketBuffer buf )
-    {
-        super.fromBytes( buf );
-        action = buf.readEnum( Action.class );
-    }
-
     @Override
     protected void handle( @Nonnull ServerComputer computer, @Nonnull IContainerComputer container )
     {
diff --git a/src/main/java/dan200/computercraft/shared/network/server/ComputerServerMessage.java b/src/main/java/dan200/computercraft/shared/network/server/ComputerServerMessage.java
index 637494dfd..27c071416 100644
--- a/src/main/java/dan200/computercraft/shared/network/server/ComputerServerMessage.java
+++ b/src/main/java/dan200/computercraft/shared/network/server/ComputerServerMessage.java
@@ -22,15 +22,16 @@
  */
 public abstract class ComputerServerMessage implements NetworkMessage
 {
-    private int instanceId;
+    private final int instanceId;
 
     public ComputerServerMessage( int instanceId )
     {
         this.instanceId = instanceId;
     }
 
-    public ComputerServerMessage()
+    public ComputerServerMessage( @Nonnull PacketBuffer buf )
     {
+        instanceId = buf.readVarInt();
     }
 
     @Override
@@ -39,12 +40,6 @@ public void toBytes( @Nonnull PacketBuffer buf )
         buf.writeVarInt( instanceId );
     }
 
-    @Override
-    public void fromBytes( @Nonnull PacketBuffer buf )
-    {
-        instanceId = buf.readVarInt();
-    }
-
     @Override
     public void handle( NetworkEvent.Context context )
     {
diff --git a/src/main/java/dan200/computercraft/shared/network/server/KeyEventServerMessage.java b/src/main/java/dan200/computercraft/shared/network/server/KeyEventServerMessage.java
index 35a156916..506127bb5 100644
--- a/src/main/java/dan200/computercraft/shared/network/server/KeyEventServerMessage.java
+++ b/src/main/java/dan200/computercraft/shared/network/server/KeyEventServerMessage.java
@@ -18,8 +18,8 @@ public class KeyEventServerMessage extends ComputerServerMessage
     public static final int TYPE_REPEAT = 1;
     public static final int TYPE_UP = 2;
 
-    private int type;
-    private int key;
+    private final int type;
+    private final int key;
 
     public KeyEventServerMessage( int instanceId, int type, int key )
     {
@@ -28,8 +28,11 @@ public KeyEventServerMessage( int instanceId, int type, int key )
         this.key = key;
     }
 
-    public KeyEventServerMessage()
+    public KeyEventServerMessage( @Nonnull PacketBuffer buf )
     {
+        super( buf );
+        type = buf.readByte();
+        key = buf.readVarInt();
     }
 
     @Override
@@ -40,14 +43,6 @@ public void toBytes( @Nonnull PacketBuffer buf )
         buf.writeVarInt( key );
     }
 
-    @Override
-    public void fromBytes( @Nonnull PacketBuffer buf )
-    {
-        super.fromBytes( buf );
-        type = buf.readByte();
-        key = buf.readVarInt();
-    }
-
     @Override
     protected void handle( @Nonnull ServerComputer computer, @Nonnull IContainerComputer container )
     {
diff --git a/src/main/java/dan200/computercraft/shared/network/server/MouseEventServerMessage.java b/src/main/java/dan200/computercraft/shared/network/server/MouseEventServerMessage.java
index bad6556a8..2fa73fb63 100644
--- a/src/main/java/dan200/computercraft/shared/network/server/MouseEventServerMessage.java
+++ b/src/main/java/dan200/computercraft/shared/network/server/MouseEventServerMessage.java
@@ -19,10 +19,10 @@ public class MouseEventServerMessage extends ComputerServerMessage
     public static final int TYPE_UP = 2;
     public static final int TYPE_SCROLL = 3;
 
-    private int type;
-    private int x;
-    private int y;
-    private int arg;
+    private final int type;
+    private final int x;
+    private final int y;
+    private final int arg;
 
     public MouseEventServerMessage( int instanceId, int type, int arg, int x, int y )
     {
@@ -33,8 +33,13 @@ public MouseEventServerMessage( int instanceId, int type, int arg, int x, int y
         this.y = y;
     }
 
-    public MouseEventServerMessage()
+    public MouseEventServerMessage( @Nonnull PacketBuffer buf )
     {
+        super( buf );
+        type = buf.readByte();
+        arg = buf.readVarInt();
+        x = buf.readVarInt();
+        y = buf.readVarInt();
     }
 
     @Override
@@ -47,16 +52,6 @@ public void toBytes( @Nonnull PacketBuffer buf )
         buf.writeVarInt( y );
     }
 
-    @Override
-    public void fromBytes( @Nonnull PacketBuffer buf )
-    {
-        super.fromBytes( buf );
-        type = buf.readByte();
-        arg = buf.readVarInt();
-        x = buf.readVarInt();
-        y = buf.readVarInt();
-    }
-
     @Override
     protected void handle( @Nonnull ServerComputer computer, @Nonnull IContainerComputer container )
     {
diff --git a/src/main/java/dan200/computercraft/shared/network/server/QueueEventServerMessage.java b/src/main/java/dan200/computercraft/shared/network/server/QueueEventServerMessage.java
index a0ca4c06e..e6e45f6dd 100644
--- a/src/main/java/dan200/computercraft/shared/network/server/QueueEventServerMessage.java
+++ b/src/main/java/dan200/computercraft/shared/network/server/QueueEventServerMessage.java
@@ -22,8 +22,8 @@
  */
 public class QueueEventServerMessage extends ComputerServerMessage
 {
-    private String event;
-    private Object[] args;
+    private final String event;
+    private final Object[] args;
 
     public QueueEventServerMessage( int instanceId, @Nonnull String event, @Nullable Object[] args )
     {
@@ -32,8 +32,13 @@ public QueueEventServerMessage( int instanceId, @Nonnull String event, @Nullable
         this.args = args;
     }
 
-    public QueueEventServerMessage()
+    public QueueEventServerMessage( @Nonnull PacketBuffer buf )
     {
+        super( buf );
+        event = buf.readUtf( Short.MAX_VALUE );
+
+        CompoundNBT args = buf.readNbt();
+        this.args = args == null ? null : NBTUtil.decodeObjects( args );
     }
 
     @Override
@@ -44,16 +49,6 @@ public void toBytes( @Nonnull PacketBuffer buf )
         buf.writeNbt( args == null ? null : NBTUtil.encodeObjects( args ) );
     }
 
-    @Override
-    public void fromBytes( @Nonnull PacketBuffer buf )
-    {
-        super.fromBytes( buf );
-        event = buf.readUtf( Short.MAX_VALUE );
-
-        CompoundNBT args = buf.readNbt();
-        this.args = args == null ? null : NBTUtil.decodeObjects( args );
-    }
-
     @Override
     protected void handle( @Nonnull ServerComputer computer, @Nonnull IContainerComputer container )
     {
diff --git a/src/main/java/dan200/computercraft/shared/network/server/RequestComputerMessage.java b/src/main/java/dan200/computercraft/shared/network/server/RequestComputerMessage.java
index 91014401c..f1a57b8d1 100644
--- a/src/main/java/dan200/computercraft/shared/network/server/RequestComputerMessage.java
+++ b/src/main/java/dan200/computercraft/shared/network/server/RequestComputerMessage.java
@@ -15,15 +15,16 @@
 
 public class RequestComputerMessage implements NetworkMessage
 {
-    private int instance;
+    private final int instance;
 
     public RequestComputerMessage( int instance )
     {
         this.instance = instance;
     }
 
-    public RequestComputerMessage()
+    public RequestComputerMessage( @Nonnull PacketBuffer buf )
     {
+        instance = buf.readVarInt();
     }
 
     @Override
@@ -32,12 +33,6 @@ public void toBytes( @Nonnull PacketBuffer buf )
         buf.writeVarInt( instance );
     }
 
-    @Override
-    public void fromBytes( @Nonnull PacketBuffer buf )
-    {
-        instance = buf.readVarInt();
-    }
-
     @Override
     public void handle( NetworkEvent.Context context )
     {