Otherwise, I can't explain why you are getting choppiness with playback in the timeline. Try resetting the NVRAM or PRAM, although this issue would be fairly rare: Try resetting the System Management Controller (but no longer available for the new M1 computers): Here are a couple of other simple procedures that you can try to see if they can fix the issue: Try going to Utilities/Activity Monitor.app and see of other processes are running and consuming excessive CPU processing power.
So you might check that.Īlso, sometimes the Mac can be running other CPU intensive processes without you knowing about it, and these can reduce efficiency of iMovie. Choppiness can be caused by insufficient application space on your drive to enable iMovie to function efficiently. See note below as to how to check the frame rate. I have found that when adding a 4k 60 clip to the timeline iMovie reduces it to 4k 30, so that is what will export whether the timeline is choppy or not. But, that might not be the cause because the lack of support for 4k 60 seems to apply only to exporting 4k 60. That might account for the choppy playback.
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