diff --git a/lib/msg.py b/lib/msg.py
index 439ca85..dc194de 100644
--- a/lib/msg.py
+++ b/lib/msg.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python2
 # -*- coding: UTF-8 -*-
 # File: msg.py
-# Date: Wed Jan 07 23:30:41 2015 +0800
+# Date: Wed Jan 07 23:59:45 2015 +0800
 # Author: Yuxin Wu <ppwwyyxxc@gmail.com>
 
 import re
@@ -22,6 +22,8 @@ TYPE_VOIP = 50
 TYPE_WX_VIDEO = 62  # video took by wechat
 TYPE_SYSTEM = 10000
 TYPE_CUSTOM_EMOJI = 1048625
+TYPE_LOCATION_SHARING = -1879048186
+TYPE_APP_MSG = 16777265
 
 class WeChatMsg(object):
     FIELDS = ["msgSvrId","type","isSend","createTime","talker","content","imgPath"]
@@ -56,8 +58,6 @@ class WeChatMsg(object):
             except:
                 pass
             return "LOCATION:" + label + " ({},{})".format(loc['x'], loc['y'])
-        elif self.type == TYPE_VOIP:
-            return "REQUEST VIDEO CHAT"
         elif self.type == TYPE_LINK:
             pq = PyQuery(self.content)
             url = pq('url').text()
@@ -67,10 +67,6 @@ class WeChatMsg(object):
                         u"No title or url found in TYPE_LINK: {}".format(self.content)
                 return u"FILE:{}".format(title)
             return u"URL:{}".format(url)
-        elif self.type == TYPE_VIDEO_FILE:
-            return "VIDEO FILE"
-        elif self.type == TYPE_WX_VIDEO:
-            return "WeChat VIDEO"
         elif self.type == TYPE_NAMECARD:
             try:
                 pq = PyQuery(self.content)
@@ -87,10 +83,22 @@ class WeChatMsg(object):
             if not name:
                 name = ""
             return u"NAMECARD: {}".format(name)
+        elif self.type == TYPE_APP_MSG:
+            pq = PyQuery(self.content)
+            return pq('title').text()
+        elif self.type == TYPE_VIDEO_FILE:
+            return "VIDEO FILE"
+        elif self.type == TYPE_WX_VIDEO:
+            return "WeChat VIDEO"
+        elif self.type == TYPE_VOIP:
+            return "REQUEST VIDEO CHAT"
+        elif self.type == TYPE_LOCATION_SHARING:
+            return "LOCATION SHARING"
         elif self.type == TYPE_EMOJI:
             # TODO add emoji name
             return self.content_no_first_line
         else:
+            # TODO replace smiley with text
             return self.content_no_first_line
 
     @property
diff --git a/lib/msgslice.py b/lib/msgslice.py
index 013a7e3..bb13c9b 100644
--- a/lib/msgslice.py
+++ b/lib/msgslice.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python2
 # -*- coding: UTF-8 -*-
 # File: msgslice.py
-# Date: Wed Dec 24 22:06:41 2014 +0800
+# Date: Thu Jan 08 00:15:49 2015 +0800
 # Author: Yuxin Wu <ppwwyyxxc@gmail.com>
 
 class MessageSlicerByTime(object):
diff --git a/lib/render.py b/lib/render.py
index e0e428d..3925de3 100644
--- a/lib/render.py
+++ b/lib/render.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python2
 # -*- coding: UTF-8 -*-
 # File: render.py
-# Date: Wed Jan 07 23:43:59 2015 +0800
+# Date: Thu Jan 08 00:22:33 2015 +0800
 # Author: Yuxin Wu <ppwwyyxxc@gmail.com>
 
 import os
@@ -60,18 +60,27 @@ class HTMLRender(object):
             js = ensure_unicode(open(js).read())
             self.js_string.append(js)
 
-    def get_all_css(self):
+    @property
+    def all_css(self):
+        if hasattr(self, 'final_css'):
+            return self.final_css
         def process(css):
             css = css_compress(css)
             return u'<style type="text/css">{}</style>'.format(css)
-        return u"\n".join(map(process, self.css_string))
+        self.final_css = u"\n".join(map(process, self.css_string))
+        return self.final_css
 
-    def get_all_js(self):
+    @property
+    def all_js(self):
+        if hasattr(self, 'final_js'):
+            return self.final_js
         def process(js):
             # TODO: add js compress
             return u'<script type="text/javascript">{}</script>'.format(js)
-        return u"\n".join(map(process, self.js_string))
+        self.final_js = u"\n".join(map(process, self.js_string))
+        return self.final_js
 
+    #@timing(total=True)
     def render_msg(self, msg):
         """ render a message, return the html block"""
         # TODO for chatroom, add nickname on avatar
@@ -155,11 +164,12 @@ class HTMLRender(object):
             blocks.extend([self.render_msg(m) for m in slice])
             self.prgs.trigger(len(slice))
 
-        return self.html.format(extra_css=self.get_all_css(),
-                                extra_js=self.get_all_js(),
-                                talker=msgs[0].talker_name,
-                                messages=u''.join(blocks)
-                               )
+        # string operation is extremely slow
+        return self.html.format(extra_css=self.all_css,
+                            extra_js=self.all_js,
+                            talker=msgs[0].talker_name,
+                            messages=u''.join(blocks)
+                           )
 
     def prepare_avatar_css(self, talkers):
         avatar_tpl= ensure_unicode(open(FRIEND_AVATAR_CSS_FILE).read())
diff --git a/lib/res.py b/lib/res.py
index 30bfe99..6decf9c 100644
--- a/lib/res.py
+++ b/lib/res.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python2
 # -*- coding: UTF-8 -*-
 # File: res.py
-# Date: Wed Jan 07 22:30:40 2015 +0800
+# Date: Thu Jan 08 00:08:43 2015 +0800
 # Author: Yuxin Wu <ppwwyyxxc@gmail.com>
 
 import glob
@@ -53,6 +53,7 @@ class Resource(object):
                     "Error interpreting the protocol, this is potentially a bug!"
                 self.speak_data[key] = full_path
 
+    #@timing(total=True)
     def get_voice_mp3(self, imgpath):
         """ return base64 string, and voice duration"""
         amr_fpath = self.speak_data[imgpath]