We just got a support call from a user at a remote site running NX at 20Mb. He reported that ever since OpenOffice 3.1 was installed, images are moving very slowing in Draw. 3.1 introduced anti-aliased images, so that was my first thought. I had him disable this new setting, and he said it immediately got faster. I just tested at 100mb, and it's doing the same thing. Slow scrolling and movement.
Thanks for all of the comments and ideas on the Qt/Google Earth 5 font rendering problems. Over the next few days, I'll be tinkering with libraries to see if I can make it work better.