I can confirm I have the same problem, where the computer becomes unresponsive for 15 to 30 seconds when starting windows, resuming from sleep, or coming out of idle. (See
this thread). I worked around the idle issue by setting up Windows to never put my monitors to sleep (I now manually power off my monitors while I keep my computer running). But the resume from sleep and windows startup are still affected with this very annoying delay. Problem goes away the moment I don't use displaylink, so definitely related.