Weird. I'm on a 2+ year old hackintosh (Core i5, 4 GB RAM, 512 MB GeForce 9800, Mac OS X 10.6.8) and rarely have problems. At least, I certainly don't have any more performance issues than I've had with vanilla Minecraft.
What settings are you guys using? I use the "normal" viewing distance, graphics set to "fast", advanced OpenGL off, and "performance" set to VSync. I also tend to quit most other running apps and only have iTunes and Chrome (usually with a few tabs on wiki pages) in the background.
The only lagging I encounter tends to be due to network congestion, as far as I can tell. I have network and CPU monitors in the menu bar, and I'm never maxing out the CPU on my machine.
edit: Except for the nether, but I think that's a problem with using Minecraft 1.2.x where performance was worse that 1.3.x anyway, and I'm rarely in the nether anyway.
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