X11 config/performance

[benchmark]

I've been trying to get X11 config/perform the last couple of days.

Basic info: Thinkpad t40, freeBSD 5.3 stable

I know that my video card (ATI Redeon 250) can do 1280x1024 (as I did
that with my linux setup), but with BSD, i can only do 1024x768. Is
there a version of a driver that i need to upgrade?

Web browsering is very sluggish with Konqueror -- though ping replies
quickly. Is this a browser problem or an X problem?

thanks