I have several students who are observing truly impressive UI delays in using DrRacket. Specifically, it often happens when they type a double-quote (“) with “automatic parentheses” enabled, and after typing the key, it will take more than 16 seconds for the screen to update and for the quotes to appear. The delay seems to be shortened significantly by clicking or hitting the arrow keys, and I suspect this may be related to OS X’s “app nap” feature, that will shut down an application when it thinks that it doesn’t need foreground processing.
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