never affected me one bit. there's occassions where darkplaces is FASTER than GLquake even on REALLY CRAPPY VIDEO CARDS (like 4mb video memory)- think about that!
I think the perception of all this slowness comes from some ill-realised GDI Generic GL ICD being used. that's all the whining i've seen about or so. My crappy PCs (around 233mhz) with relatively exotic and old video hardware can run Darkplaces just fine, if it doesnt run fine then you are doing something terribly wrong
update your drivers. There is no valid reason why a PSP should run fitzquake better than your computer