Oh. My quad-core is a PC, though.

I'm fixing up the old iMac for a friend of mine. I might have to see about installing the JJ2 demo here for comparison. (Intel/Dual-Core/Windows 7)

*** EDIT ***

I think I know what it was.

I'm staying at my friend's for a few days and just scored a gaming keyboard over at a nearby thrift store. I haven't had a chance to try the new keyboard on my PC back at home yet, but I was using it to work on the iMac.

When I loaded up JJ2 on my friend's PC, I noticed the loose controls like I'm used to. So I figure I might try the same keyboard that I was using on the iMac... And I think that was it. There's probably some difference in performance, but that'd take more testing than I'm interested in doing.

I didn't really think choice of keyboard mattered that much.

This topic didn't turn out half as interesting as I hoped it would.