Framerate:
- FPS limitation: off
- Frame skipping: off
- FPS limit: Auto
Two suggestions on your configuration. First, check FPS limitation (use FPS limit). More often than not, auto FPS limit slows you down. In the FPS limit box, put either 50 or 60 (depending on whether you are playing PAL or NTSC games). If that does not improve the performance enough (your sound plugin may be a slow one too, but you haven't listed it), check frame skipping. That can increase your speed dramatically, even if it often comes at the cost of decreased quality.