diff --git a/.gitignore b/.gitignore
index 940719b0..62465364 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 bin/
-externLog.txt
\ No newline at end of file
+externLog.txt
+*.memoized
\ No newline at end of file
diff --git a/kiss/src/kiss/KissInterp.hx b/kiss/src/kiss/KissInterp.hx
index 5fdb3fd9..36a6a7f7 100644
--- a/kiss/src/kiss/KissInterp.hx
+++ b/kiss/src/kiss/KissInterp.hx
@@ -48,8 +48,23 @@ class KissInterp extends Interp {
         variables.set("kiss", {});
     }
 
+    public var cacheConvertedHScript = false;
+
     public function evalKiss(kissStr:String):Dynamic {
-        return evalHaxe(Prelude.convertToHScript(kissStr));
+        #if !(sys || hxnodejs)
+        if (cacheConvertedHScript) {
+            throw "Cannot used cacheConvertedHScript on a non-sys target";
+        }
+        #end
+
+        var convert =
+            #if (sys || hxnodejs)
+            if (cacheConvertedHScript) {
+                Prelude.cachedConvertToHScript;
+            } else
+            #end
+                Prelude.convertToHScript;
+        return evalHaxe(convert(kissStr));
     }
 
     public function evalHaxe(hscriptStr:String):Dynamic {
diff --git a/kiss/src/kiss/Prelude.hx b/kiss/src/kiss/Prelude.hx
index 336275bc..8fa2723a 100644
--- a/kiss/src/kiss/Prelude.hx
+++ b/kiss/src/kiss/Prelude.hx
@@ -506,6 +506,10 @@ class Prelude {
         #end
     }
 
+    #if (sys || hxnodejs)
+    public static var cachedConvertToHScript:String->String = cast(fsMemoize(convertToHScript, "convertToHScript"));
+    #end
+
     public static function getTarget():KissTarget {
         return #if cpp
             Cpp;
diff --git a/projects/kiss-vscode/src/ktxt2/KTxt2.kiss b/projects/kiss-vscode/src/ktxt2/KTxt2.kiss
index fe3b8712..7916c296 100644
--- a/projects/kiss-vscode/src/ktxt2/KTxt2.kiss
+++ b/projects/kiss-vscode/src/ktxt2/KTxt2.kiss
@@ -69,6 +69,7 @@
     (let [&mut sourceText ""
             &mut outputText ""
             interp (new KissInterp)]
+        (set interp.cacheConvertedHScript true)
         (doFor ktxtElement (splitFileElements fileStream)
             (case ktxtElement
                 ((Block (objectWith source output))