10 years ago, hd4830 with no DPM did 1 fps software rendering with radeon; and 300 fps in catalyst, with 40fps at pixel_vomit map with bloom+flares+hires textures.
Today hd830 with radeon has automatic DPM and it does 280 fps and 40 fps at pixel_vomit map with bloom+flares+hires textures (since kernel 3.15+Mesa 10.2.2).
Alone the fact how open radeon destroyed closed source macos, which has similar marketshare to linux, shows a LOT.
Your R100 card is over 10 years old, what improvement do you expect? Pick more modern card and do a time travel. This is considering Linux.
With windumbs, there is no point in time travel because it has HUGE marketshare. So referencing windumbs has only a point as a maximum achievable performance and not as a usable alternatives. Because in that case, thats completely wrong forum.