No, 85 degrees is not ok. I love macs, but their cooling is worse than poor.

Optifine should actually improve things for you. If you're worrying about temperaturas, you can assign less of the CPU to minecraft, which may slow it down but it won't melt the processor.

What does yours reach when running MC? Mine never goes over 80 but 85 and higher ill turn off some graphics in game. 90 C is what I've heard is the max to run.

Thank you. I lowered my java allocation and now it usually stays at 77C~78C. I tried to see the limit and I intentionally /warped to the marketplace and ran straight inwards, and I could only get the temperature up to 86. Wouldn't go higher.

ehh I have warranty so ima let mine melt

Same holy xD