This was with both Ubuntu 8.04, and the 8.10 beta.
One in particular was ign.com. It was almost unusable.
After a lot of digging, I found the key, at least for my situation.
In your xorg.conf file (/etc/X11/xorg.conf) add the follwing in the Device section.
Option "AccelMethod" "exa"
Option "MigrationHeuristic" "greedy"
From what I gather, "exa" is the new way for X to handle accerlation for intel chips.
What I know for sure, is that my firefox scrolls nice and fast again, and alot of other wiered graphical anomalies with compiz have stopped happening alltogether.
I am happy!
