I’m on Windows with a Core 2 Quad @ 2.66 ghz and a Geforce 9600 GT. Not the fastest system in the world but until recently it was running ppsspp just fine with 2x resolution. Now the framerate is dropping to ~14 FPS. Even with native resolution, during cutscenes in Growlanser IV, the audio doesn’t seem to be able to keep up. I just updated the core yesterday, but I don’t know how long is was before then, so I don’t know when the problem started.
Scratch that, you said windows indeed. Well the core hasn’t been updated since March, so it’s highly unlikely that “updating” caused this