my imac is very slow
My iMac has slowed considerably
iMac 21.5″, macOS 11.6
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Download and run Etrecheck. Copy and paste the results into your reply. Etrecheck is a diagnostic tool that was developed by one of the most respected users here in the ASC and recommended by Apple Support to provide a snapshot of the system and help identify the more obvious culprits that can adversely affect a Mac's performance.
Copy the report
and use the Additional Text button to paste the report in your reply.
Then we can evaluate the report to see if we can determine the cause of the problem.