Okay, give me a second. I even tried a fresh copy of Win7 on the Mac Mini, and it still got 60FPS.
Okay, thanks! But, what do I do now? Wait for a Mojang employee?
Now, on the MBP, I am getting maybe 20 on a good day, on the Mini, it gets 5 - 15 FPS. This isn't a hardware issue, I decided to dual boot Windows XP on the mini, and I can easily get 60FPS with VSync, Far, Fancy, and Smooth Lighting. If you'd like, I can link to several unresolved forum threads from around the web. The Mini should be playable on the lowest settings. Nothing I do to the settings help it. Optifine did nothing. Its really strange.
Log.