normal FPS, but some games are slow.

[nosisab Ken Keleh]

This effect is mostly due to excess VU cycle stealing. That's what people calls false FPS (what is kind of a nonsense because the FPS is indeed increased, just that things happening slower at greater FPS do lag...).

Try reducing VU cycle stealing a bit, this might cause the FPS to go down a bit, try compensating with increasing EE cyclerate. Notice this last might cause sound desync issues in some games.

You may want to play with these two speedhacks till finding the best compromise.Be aware some games are more sensible to speedhacks than other, where a game would accept a high speedhack value another could lag or desync for much less.

Edit for cleanness: different from media like for example actual celluloid movies, the number of times a frame is presented is not what defines the pace the action happens in PC. Is easy to understand this observing how a PC game running at 30 FPS looks like the same running at 300 FPS, what changes is the smoothness the action happens.

VU cycle stealing works interrupting the normal EE processing (hence it steals cycles from EE, it forces EE to interrupt what is doing to send data to the VUs out of due time) what might cause the game to process slower. The final result being if EE is interrupted too much the action happens slower despite the number of frames per second increases. Sometimes is better living with a slight slower FPS having near the normal game pace than with a greater FPS where things changing at each frame are slow. Remember a still image is yet still be it at 1 FPS or 1000 FPS.