better performances of ox.js.minify

ox/js.py

@@ -1,6 +1,7 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
 # vi:si:et:sw=4:sts=4:ts=4
+import sys
 
 from ox.utils import json
 
@@ -8,6 +9,12 @@ def minify(source, comment=''):
     # see https://github.com/douglascrockford/JSMin/blob/master/README
     def get_next_non_whitespace_token():
         pass
+    # python2 performance with unicode string is terrible
+    if sys.version[0] == '2':
+        if isinstance(source, unicode):
+            source = source.encode('utf-8')
+        if isinstance(comment, unicode):
+            comment = comment.encode('utf-8')
     tokens = tokenize(source)
     length = len(tokens)
     minified = '/*' + comment + '*/' if comment else ''