After I used javascript and html5 to develop an othello game, I find that javascript actually is a really fast language. It can calculate 8-10 steps,about 10k nodes in less than three seconds.Based on my testing, I found chrome javascript engine is faster than firefox.

This is my othello game link: http://bwchess.sinaapp.com

A snapshot:
http://bwchess.sinaapp.com/snapshot.jpg