Well, I just rebuilt QT with WITHOUT_OPENGL=yes, and that solved the problems of QT programs segfaulting on exit. With my 1.2ghz Athlon, 768mb ram, GF2 Ti (honestly don't know more than that offhand) running on FreeBSD 4.8, GLXGears gives me:
10244 frames in 5.0 seconds = 2048.800 FPS
11627 frames in 5.0 seconds = 2325.400 FPS
11635 frames in 5.0 seconds = 2327.000 FPS
11425 frames in 5.0 seconds = 2285.000 FPS
11696 frames in 5.0 seconds = 2339.200 FPS
Now, if anyone would care to show me how to get Half-Life and mods to run under WINE without totally screwing with every single texture (everything is super stretched out), I would be most happy.