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Disk transfer speed deterioration since installing Windows 11
I am not sure whether this question belongs in Windows 11 or PC hardware, it seems to be hardware but the change in O/S has introduced the issue. If an admin wants to move this into a more approp...
Your situation involves a notable drop in network transfer speeds and erratic disk performance after upgrading from Windows 10 to Windows 11 on your custom desktop. Since you've already ruled out hardware or network issues, the problem likely relates to Windows 11's configuration or drivers.