Spinning beachball
I get the spinning beachball everyday minutes after I open the iMac. Often right after I open something. Force quit does not open. Have to cut power to start over. Usually that solves the problem, whatever it is
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Try booting to Safe Mode. That boot up takes minutes and clears caches and other things that may resolve your problem.
How to use safe mode on your Mac - Apple Support
A lot of times just boot to Safe Mode followed by normal boot resolves problems.