Fastvid110 I installed and tried fastvid. I achieved a whole one one-half frame per second in the crusher.dm2 time demo test. While the fastvid install and vspeed test demonstrated a large increase in the bytes of throughput for my video. The overall performance in Quake2 was neglible. Tweakit Tweakit is an interesting utility.
Benchmarks show an increase in performance.
I cranked all applicable values for my mother board up to the max. My own perceptions and benchmarks leads me to believe that it gives me a performance increase. I say try it and see if it works for you.