Did the noble and heroic Mihail121 finally solve this problem? I am running VL SOHO 5.8 using the generic Radeon driver and performance is terrible. PPracer is unplayable and my major app blender works lousy too. I know it can be much better because I used to Have Ubuntu on this same machine and the proprietary Radeon driver worked like a charm on the same hardware.
I have downloaded the ati installer and run it, it finishes happily but then when I try to run X it stops and says it can't find fglrx. I must find the right log file and see what's happening. I love the attitude of Vector Linux but it makes you stay on your toes with the occasional package dependency problem and some hardware issues. It must be worth it cause I spend the time fighting and sometimes winning.