UI is almost entirely dependent on VIDEO, and somewhat on CPU, not RAM. Adding RAM will never help drawspeed, unless video memory is shared.
The video chip looks to be a real dog. Your speed issues are probably coming from badly optimized video drivers. However, I leave open the possibility that the Transmeta chip simply doesn't handle video instructions as well as other types of instructions.
Anyway, I just want to make sure that when people are troubleshooting problems with these units, that they are starting in the right places. Adding RAM to solve video issues is the _last_ thing you should do. Tracking down better drivers should be first.