In addition to the comments above regarding BIT Locker and Antivirus, there is another overlooked area within access itself that affects performance. If you have compression enabled, that could also lead to performance issues.
As for anti-virus, a lot of System Admins like to blame software for their weaknesses, and a lot them are highly prejudicial on Office Products, especially Access. They will implement Anti-virus and harden it to the point where applications just stop functioning or become terribly slow. Access itself is not the culprit. A trusted application should be placed in a trusted location where there is no pro-active defense. I personally do not run any 3rd party anti-virus software. I rely entirely on built-in windows security. I have had nothing but bad experiences with all the popular 3rd anti-virus software, mainly regarding performance of office products.
Also, if you are running any Emulator Software, make sure your Office components have been updated. Older Emulators like to install office core dll's in the older folder structures. The problem is this cause ambiguity when certain functions are called.
I am not sure why or how upgrading from Windows 10 to 11 would affect this, but it is worth looking into. Make sure the "Name AutoCorrect Options" are disabled in your production application. Thise feature is enabled by default in new Access Databases. This feature tracks name changes to objects and can track in run mode if enabled.
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