I haven't actually tried running the non-Steam version to compare. I'd check right now if I weren't too lazy to switch it to windowed mode or didn't hate windowed mode so much (I consider it unplayable that way, doubly so on a tiny laptop screen). Or if the OS X version responded to cmd-tab so I could actually switch out of the game and check that way. That's probably my biggest annoyance with the Mac version. Seems to run plenty fast, even with the really ghetto Mac Steam client (seriously, the Windows one running in VirtualBox is twice as good/half as flaky, when it should be worse just by definition) running, though. Heh.