some microbenchmark updates, slight speed improvement

lib/parser/javascript.js

@@ -24,6 +24,17 @@ util.inherits(FasterReplyParser, events.EventEmitter);
 
 exports.Parser = FasterReplyParser;
 
+// Buffer.toString() is quite slow for small strings
+function small_toString(buf, start, end) {
+    var tmp = "", i;
+
+    for (i = start; i < end; i++) {
+        tmp += String.fromCharCode(buf[i]);
+    }
+
+    return tmp;
+}
+
 FasterReplyParser.prototype._parseResult = function (type) {
     var start, end, offset, packetHeader;
   
@@ -38,7 +49,11 @@ FasterReplyParser.prototype._parseResult = function (type) {
         if (this.options.return_buffers) {
             return this._buffer.slice(start, end);
         } else {
-            return this._buffer.toString(this._encoding, start, end);
+            if (end - start < 65536) { // completely arbitrary
+                return small_toString(this._buffer, start, end);
+            } else {
+                return this._buffer.toString(this._encoding, start, end);
+            }
         }
     } else if (type === 58) { // :
         // up to the delimiter
@@ -49,7 +64,7 @@ FasterReplyParser.prototype._parseResult = function (type) {
         this._offset = end + 2;
 
         // return the coerced numeric value
-        return +this._buffer.toString(this._encoding, start, end);
+        return +small_toString(this._buffer, start, end);
     } else if (type === 36) { // $
         // set a rewind point, as the packet could be larger than the
         // buffer in memory
@@ -185,8 +200,8 @@ FasterReplyParser.prototype.append = function(newBuffer) {
 
 FasterReplyParser.prototype.parseHeader = function () {
     var end   = this._packetEndOffset(),
-        value = this._buffer.toString(this._encoding, this._offset, end - 1);
-  
+        value = small_toString(this._buffer, this._offset, end - 1); 
+
     this._offset = end + 1;
 
     return value;