JPCSP extremely slow?

[Itaru]

You need to enable several options in the Video configuration to get decent speed: Use vertex cache, Use shaders, Use a Geometry shader, Enable VAO, Enable saving GE screen to Textures, and Enable decoding of indexed textures. The option that most affect speed is the Enable saving GE screen to Textures one, so you need to enable that one at all times and experiment with the other options to see if they help or not on your system.