From b47a3ab5857cd06fdc9d01ba253f99a484f947af Mon Sep 17 00:00:00 2001
From: "jeremy@jermolene.com" <jeremy@jermolene.com>
Date: Thu, 4 Nov 2021 16:43:06 +0000
Subject: [PATCH] Precompile the filters for performance

---
 core/modules/filterrunprefixes/cascade.js | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/core/modules/filterrunprefixes/cascade.js b/core/modules/filterrunprefixes/cascade.js
index f016d4346..b42119d7b 100644
--- a/core/modules/filterrunprefixes/cascade.js
+++ b/core/modules/filterrunprefixes/cascade.js
@@ -15,13 +15,17 @@ Export our filter prefix function
 exports.cascade = function(operationSubFunction,options) {
 	return function(results,source,widget) {
 		if(results.length !== 0) {
-			var filterList = operationSubFunction(source,widget);
+			var filterList = operationSubFunction(source,widget),
+				filterFnList = [];
 			var inputResults = results.toArray();
 			results.clear();
 			$tw.utils.each(inputResults,function(title) {
 				var result = ""; // If no filter matches, we return an empty string
-				$tw.utils.each(filterList,function(filter) {
-					var output = options.wiki.filterTiddlers(filter,{
+				$tw.utils.each(filterList,function(filter,index) {
+					if(!filterFnList[index]) {
+						filterFnList[index] = options.wiki.compileFilter(filter);
+					}
+					var output = filterFnList[index](options.wiki.makeTiddlerIterator([title]),{
 							getVariable: function(name) {
 								switch(name) {
 									case "currentTiddler":
@@ -32,7 +36,7 @@ exports.cascade = function(operationSubFunction,options) {
 										return widget.getVariable(name);
 								}
 							}
-						},options.wiki.makeTiddlerIterator([title]));
+						});
 					if(output.length !== 0) {
 						result = output[0];
 						return false;