Move some arrays into functions so they don't get cloned on each new context.

src/uri.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 21 matching lines @@
 
 function URIAddEncodedOctetToBuffer(octet, result, index) {
   result[index++] = 37; // Char code of '%'.
   result[index++] = hexCharCodeArray[octet >> 4];
   result[index++] = hexCharCodeArray[octet & 0x0F];
   return index;
 }
 
 
 function URIEncodeOctets(octets, result, index) {
+  if (hexCharCodeArray === 0) {
+    hexCharCodeArray = [48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
+                        65, 66, 67, 68, 69, 70];
+  }
   index = URIAddEncodedOctetToBuffer(octets[0], result, index);
   if (octets[1]) index = URIAddEncodedOctetToBuffer(octets[1], result, index);
   if (octets[2]) index = URIAddEncodedOctetToBuffer(octets[2], result, index);
   if (octets[3]) index = URIAddEncodedOctetToBuffer(octets[3], result, index);
   return index;
 }
 
 
 function URIEncodeSingle(cc, result, index) {
   var x = (cc >> 12) & 0xF;
@@ skipping 257 matching lines @@
     if (cc == 126) return true;
     
     return false;
   };
 
   var string = ToString(component);
   return Encode(string, unescapePredicate);
 }
 
 
-const hexCharArray = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
-                      "A", "B", "C", "D", "E", "F"];
-
-const hexCharCodeArray = [48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
-                          65, 66, 67, 68, 69, 70];
+// Lazily initialized.
+var hexCharArray = 0;
+var hexCharCodeArray = 0;
 
 
 function HexValueOf(c) {
   var code = c.charCodeAt(0);
   
   // 0-9
   if (code >= 48 && code <= 57) return code - 48;
   // A-F
   if (code >= 65 && code <= 70) return code - 55;
   // a-f
   if (code >= 97 && code <= 102) return code - 87;
   
   return -1;
 }
 
 
 // Convert a character code to 4-digit hex string representation
 // 64 -> 0040, 62234 -> F31A.
 function CharCodeToHex4Str(cc) {
   var r = "";
+  if (hexCharArray === 0) {
+    hexCharArray = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
+                    "A", "B", "C", "D", "E", "F"];
+  }
   for (var i = 0; i < 4; ++i) {
     var c = hexCharArray[cc & 0x0F];
     r = c + r;
     cc = cc >>> 4;
   }
   return r;
 }
 
 
 // Converts hex string to char code. Not efficient.
@@ skipping 46 matching lines @@
     "unescape", URIUnescape,
     "decodeURI", URIDecode,
     "decodeURIComponent", URIDecodeComponent,
     "encodeURI", URIEncode,
     "encodeURIComponent", URIEncodeComponent
   ));
 }
 
 SetupURI();