Does LR 2 Require Mac OS X 10.5 To Perform Optimally?

I'm running LR 2 on Mac OS X 10.4.11. As many others have reported, it can run very slowly. I've read elsewhere that LR 2 really should be used with OS X 10.5 for optimal performance. As I understand it, LR 2 is a 64-bit app (unlike LR 1.4.1, which was a 32-bit app), and needs the 64-bit libraries of OS X 10.5 to perform at it's best.
Can anyone else confirm that moving to 10.5 speeds things up??
Thanks.

>As I understand it, LR 2 is a 64-bit app (unlike LR 1.4.1, which was a 32-bit app), and needs the 64-bit libraries of OS X 10.5 to perform at it's best.
That's correct, if you have plenty of ram. 64 bit applications can go beyond the <4gig limit of 32 bit apps. So, if you have 4 or more gigs of ram, running Lightroom as a 64 bit app can improve those things that are ram intensive (processing previews, processing raws, exporting). Much of Lightroom is either CPU bottlenecked or disk I/O and 64 bits won't really help there.

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