Consistently Lagging in Super Mario Sunshine (and a few other games)

[Saritos]

I've set the shader compilation to Ubershaders here.
I still seem to be getting roughly the same performance. Noticeably choppy and stuttering audio, with pretty much the same framerate as before. It seems to stabilize from anywhere between 22-27 FPS when not doing anything, but it can dip it the 10's and sometimes single digits when attempting any form of movement, or moving from one part of the island to the other.