How NOT to launch my Mac mini into orbit?

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When running KSP, even while I'm still on the ground in Mission Control or the VAB, my mid-2011 Mac mini (2.3 GHz Intel Core i5, 8 GB RAM, Intel HD Graphics 3000 with 512 MB) appears to make serious attempts to follow my constructions into orbit - the CPU fan is running on full power all of the time, and I am worried about the long-term effects of the heat stress. What are the most effective ways of lowering the overall load that KSP produces while still keeping it playable?
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Mac Mini Stuck at Boot/Startup
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