I've encounted a bit of a problem. Framebuffer effects aren't working for me at all. I'm in DirectX mode. I'm using version Rice Daedalus 5.4.2.
I was trying Banjo-Kazooie to see how slow framebuffer emulation would be and stepped up through all of the framebuffer options but got no slowdown or framebuffer emulation.
OpenGL mode is worse. Not only do the framebuffer effects not work (although I don't think they're supposed to in this mode) but the lighting seems screwed (making a lot of stuff darker than it should be) and it keep pausing. The pausing gets more frequent as the game goes on.
Edit: OK, this is weird. It seems the plugin randomly chooses which games that the framebuffer works on. Super Smash Brothers, Star Fox 64 and Turok displayed the characteristic slowdown. Banjo-Kazooie, Super Mario 64 and Mario Kart 64 didn't.
Oh yeah, and Mario Kart 64 refused to display ANYTHING.