I use Windows for work. My setup is a bit unusual, since I run Windows inside a hyper-V VM (itself running on Windows), but the performance gets abysmal between

I use Windows for work. My setup is a bit unusual, since I run Windows inside a hyper-V VM (itself running on Windows), but the performance gets abysmal between logins. Whenever I unlock, everything grinds to a halt, applications shudder, even the start menu takes a couple minutes to activate. It spastically doesn't register window events and then suddenly 50 Alt+Tabs and click events burst through. After about 15 minutes it's mostly back. I'd like to debug, but I have no clue where to start. I tried to follow Randomascii's examples and collect perf traces, but I have a hard time drilling that far in. Weirdly, the reported CPU usage is less than 50% but there's a flood of DPCs of some kind. It wasn't always this bad. I think it's just Winrot. I'm thinking of investing in an unattended image building process so I can just keep swapping "fresh" copies of Windows in, but I shouldn't need to damnit! (Disclaimer: I made the foolish decision to use Insider builds, and I work for MS so I might be eating some bad dogfood. Also, the outer Windows works fine, so it might be hyper-V issues.)