If you have a dual core Intel Mac, OS X 10.4.9, X-Plane 8.60 and an Intel Graphics chip, try running the sim with this command-line option:

–use_threaded_ogl

You can read about how to use X-Plane with command-line options here.

About Ben Supnik

Ben is a software engineer who works on X-Plane; he spends most of his days drinking coffee and swearing at the computer -- sometimes at the same time.