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When I got my new iMac a few months back it was fantastic! iMovies worked at top speed but now its sluggish and takes forever to convert files
Why??
iMac Line (2012 and Later)
Is your hard drive almost full?
It should never have more than 75% for efficient performance.
Go to the Apple menu at the top left corner of the screen, select "About This Mac" and click on the "Storage" tab to see how much free space you have.
If that is OK try restarting your iMac to clear away some of the accumulated garbage and refresh the memory.
Have you got the Chrome browser or CleanMyMac installed as they have been implicated in performance problems with Final Cut Pro and iMovie?
Download the free version of Etrecheck. Run it and post the results on here.
It is perfectly safe and will not show any private information. Give it full drive access.
Did you try restarting your iMac?
Is the iMovie Library particularly large?
Have you got loads of 4K footage?
Earlier this year my 2017 iMac suddenly started beach balling when I tried to play clips in the Final Cut Pro timeline.
It turned out there was one corrupt clip in the project which I deleted and reimported.
Everything was fine after that but finding a corrupt clip involves a bit of detective work.
Try a new project with new clips.
Less than a 1/4 used
Run the etrecheck and no major issues
I have restarted a few times
Its weird speed just started slowing down! Im not happy as this machine is new!!
Try trashing the preferences.
Start up iMovie while holding down the Command and Option keys.
In the window that opens select "Delete Preferences".
One more thought . . . have you recently upgraded to Monterey and iMovie 10.3 as I think some people doing so have had serious performance issues?
My new iMac M1 2021 has dropped processing speed dramatically particulalrly on iMovies!! Why??
