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#41
By no means I am an expert, but try this. On one of the Windows 10 machines that is slow; open Run > type services.msc and then hit enter.
Services popup appears. Scroll and find "Computer Browser", write down what your setting is (should be manual). Stop the service and then change the startup to "Disabled", reboot
Try your Windows 10 and see if that helps. If not then go back and set back your settings.