Huge lag when smoke / semi-transparent / alpha effect

[[Unknown]]

PSP games often use alpha testing, which modern hardware doesn't like. Modern games don't use alpha testing anymore, it's considered an outdated technique.

Additionally, the PSP supported complicated alpha blending modes, which modern hardware does not natively support. Sometimes we have to do extra work to emulate these correctly. You can check "Disable slow framebuffer effects" in the settings to disable this extra effort - but it may make it look bad.

What game or games is this even happening in?

-[Unknown]