See http://running.ph/
It just hangs chrome for a while, while all the buttons load. I\'ve read using IFrame avoids this but I really want to use XFBML JS for all th
I had problems with this, too.
It's Social network's API fault. If you look in Chrome to the NET tab, you'll see that there are 252 requests per page! (Facebook, g+, Twitter, your resources)
This is part of problem
loadScriptAsync('//connect.facebook.net/en_US/all.js');
it loads all scripts possible, maybe multiple times without caching. I think there's no chance to avoid this from your side
OT: Why do you require offline&SMS access when logging on your site? I think nobody wise would like to give you him/her phone number and/or offline access