As many of you know, since the latest patch I was getting horrible graphics lag. To the point where I had to run in an 800x600 window on the lowest graphical settings.
My card is an ATI Radeon Mobility 9200.
Disabling the hardware cursor helped to remove most of the problems. I wasn't losing dozens of frame a second anymore, but I was stuck with a crappy software cursor.
After reading a lot of the Blizzard support forums I found a link to a site that provides unoffical drivers for ATI cards (and others).
Things were so bad, I figured I'd give it a shot.
By far my graphics, framerate and performace have improved with these drivers. Of course, they come with all the standard warnings you'll get when you use unoffical driver releases, but they made such a huge difference for me I can't not bring them up for others who may have similar problems.
http://www.omegadrivers.net/
The only thing they don't fix is the underwater bug with fullscreen glow on ATI cards. So, until Blizzard fixes that, no fullscreen glow, but everything else is great!