Question edited for clarity and toss in some CAPS.
It is a well known issue.
If you find your Mac is running slowly, there are a number of potential causes that you can check. Your computer's startup disk may not have enough free disk space. To make disk space available, you can move files to another disk or an external storage device, then delete files you no longer need on the startup disk.
If your Mac runs slowly - Apple Support (CA)
Apple Support
https://support.apple.com > guide > mac-help > mchlp1731
macbook m1 is slow
Apple Support Community
https://discussions.apple.com > thread
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Why Is My Mac So Slow? ' Speed Up Your Mac Now
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