Merge pull request socketio#689 from bwillard/master

Improve performance of parser.decodePayload

Author: rauchg

lib/parser.js

@@ -234,7 +234,7 @@ exports.decodePayload = function (data) {
 
     for (var i = 1, length = ''; i < data.length; i++) {
       if (data[i] == '\ufffd') {
-        ret.push(exports.decodePacket(data.substr(i + 1).substr(0, length)));
+        ret.push(exports.decodePacket(data.substr(i + 1, length)));
         i += Number(length) + 1;
         length = '';
       } else {