Comment 5 for bug 252970

If you want to verify that it's waveform related, try using an old install of Mixxx 1.5.x. That uses the old waveform, I suspect the performance will not be any better though, because as RJ said the old one used OpenGL too.

Since there is no reason why a GeForce 4 card can't do basic OpenGL (I used to run XGL on a GF4 Ti4400 on Dual P3 800 with no probs), I suspect there is a problem with the video driver or the windows installation, especially because it works on Debian w/ same video hardware.

If the CPU was maxing out when a song loads, I would suspect that is either BPM detect or waveform generation which are issues known to effect slower hardware.