I was having a friend over, (He's really new to Minecraft, so expect unrealistic things to be said), and he was in Default terrain gen when his FPS rates plumited from a decent 60 to a terrible 5! He was like "Evan, make it not lag!!!" Details about computer:
Bought in 2011, an Apple iMac, haven't used Boot Camp, 1TB drive, and 12GB of RAM, and 4GB dedicated to Minecraft. I don't know how to replicate it. It's not the newer, thinner Macs, it's 1 inch thick on the side and 2 inches thick in the middle. It is also the model with the gray square at the bottom.
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CubeTheThird
RAM has little influence on game performance. The main contributing factors are CPU and GPU. Currently all performance related snapshot issues are being linked to MC-45458. Should issues continue in 1.7.9 their video settings should be reduced, or they can seek support from tech support.
For technical support please use the Mojang Support Center.
Can't confirm, MC 14w21b is running nicely on my even worse machine: MacBook Air 11" i5 1.7GHz 4GB RAM