Hi,
When did this issue started to occur?
Were there any changes made to your PC?
You could try boot into Clean Boot to see if this is affected by third-party apps or extensions.
Also, try these troubleshooting methods:
https://support.microsoft.com/en-us/windows/fix-file-explorer-if-it-won-t-open-or-start-ce614e06-be97-fe4a-a7ce-d6bf13a8cb98
Check out these discussions about similar issue on this thread:
https://learn.microsoft.com/en-us/answers/questions/53735/windows-10-file-explorer-slow-working.html
Best regards.
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