I've solved my performance issues under Windows. It turns out that Soeedstep was fucked up. Disabling it has *massively* improved performance. Like, fucking, night and day. Suddenly it's running so fucking smoothly, Clone Hero gets around 400 fps with 8x MSAA, and I'm willing to bet I could actually get Sonic Forces to run reasonably well now. It's beautiful.
Oh my gods, Sonic Forces works and it works well and AAAAAAAHHHH!!!!
It's goood!
I love this game. I absolutely adore this game. It is the game my inner child has always wanted and it. is. glorious.
I mean, yeah, it could be better, but AAAAAAAAAHHH IT'S GOOOOOOD!!!