Ridge Racers(Asian version) is a slideshow :(

[montcer9012]

The game runs a bit better, but still hovers around 25-30fps and dips a bit lower on certain parts of the track.

First try with JPCSP x64 build, set the same config that you have before and now set the compiler option MaximumMethod Size to 50 or 100; if you want try the 5 options until you found better results.

Also, on Video Options try toggling ON: -Disable Optimized VertexInfo.