I'd like to ask that the Telltale team please make a toggle for real-time shadows.
I've tried running The Penal Zone on both OSX and Windows 7, on the same computer, with a nice GeForce 8800 GTS 320MB. In Windows 7, I can run at graphics level 9 with no slowdowns, and everything looks great. In Mac OSX, anything above graphics level 6 slows the game to a crawl. It seems like level 7 has shadows enabled while level 6 doesn't, which would appear to cause the slowdown.
I guess maybe your OpenGL shadowing system is just slower than the DirectX one. It would be great, of course, if you guys could make it run at a similar speed, but if not, it would be really nice if I could just turn off shadows so that I could run everything else at high graphics levels.
Thanks for whatever solution you come up with.