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Got it working! This did not work: -force-glcore This did work: -force-opengl The filesystem didn't matter; I was able to run without stuttering from an APFS partition.

Moving the KSP installation to a brand-new "Mac OS Extended (Journaled)" partition did not solve the issue. FWIW, this seems very much like a graphics issue and not an IO-bound issue.

I hate to be one of those "I really need this, please fix ASAP" people, but........ I'm scheduled to give a talk at a programming conference near the end of October, using KSP as the main interaction mechanism. So.... I really need this, please fix ASAP. (Same issue, just started happening with High Sierra on my 2017 MacBook Pro w/ TouchBar; Intel Iris Plus Graphics 650 1536 MB)