Originally Posted by SeoShizune

I'm playing with Firefox

I have found your problem!

Jokes aside, most nutaku games play horribly on firefox (GK is an exception) and way better on chrome/opera. I would recommend changing browser.

If you do not feel like it and are keen on keeping firefox for other things than browsing non-nutaku sites, you should remember to disable hardware acceleration in firefox (google it, nutaku games have problems handling that one too).