Suse 11.4 firefox kde smoothscrolling

When I installed suse, scrolling in firefox was really laggy(<20 fps) on my 1920x1200 monitor and hd 4200 igp. After playing with some system settings, I realized that smooth scrolling was on by default in Firefox 4. Disabling it made firefox useable as a browser.

My question is why the suse engineers would do such an idiotic thing. The setting is turned off by default for a reason on all of the firefox channels, so it's stupid for a distro to enable the feature, especially when it reduces system useability.