Hi,
There have been reports confirming that File Explorer in Windows 11 is noticeably slower than in Windows 10. Microsoft has acknowledged the issue and is actively working on performance improvements. These fixes are currently available in build 26220.7271, and hopefully the problem will be resolved once this update reaches the stable release.
For the meantime, you can try reverting to the Windows 10 File Explorer by using this free third-party tool and check whether the functionality you need works as expected after switching.
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