Well, I've done some benchmarks and I got the oppposite result as you guys, my system gets better scores in 64bit, and quite better as you can see. As for the slowdown problem, maybe it's something else, like the graphics, don't know what I can do to find the issue.

@Rayflower: try rebuilding the prebindings, I got that problem the first time and that solved it. I always use mainmenu for that purpose but there are many tools for that.

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CPU: AMD Athlon 64 3000+ @2.3Ghz - Motherboard: ASUS A8N-SLI nForce4 SLI - nForceLAN by eno - SuperNForceATA by Medevil - RAM:2 GB DDR 333Mhz Audio: ALC850 Video: XFX nVidia GeForce 8400GS 256Mb (0x06e4) QE & CI from Chameleon 2 RC4Ethernet: Realtek RTL 8139 Series (working out of the box) OS: Snow Leopard 10.6.4 (aryajuanda's guide) + Windows XP 64bits