I've just started using Ubuntu (10.10) so I have a reasonably fresh install.
Regardless of if I use the Firefox 4 latest beta or 3.6.13. Google image search is dead slow and sometimes intermittently freezes.
It's exceptionally slow compared to the same versions of Firefox when I was using Windows.
As an aside Microsoft's Bing doesn't freeze.
Are you using any add-ons? Do you see the same behaviour if you
firefox -safe-mode
and pressing Enter?I'm sorry, but from what I know, It can only depend on your internet connection (loading pictures can be rather heavy for some internet connections) or googles own servers. It has nothing to with if you use ubuntu or firefox (since firefox 3 works flawlessly for other users).