Windows 11 after July 25 update - pegging performance cores, keeping fans running

Hi -

Macbook Pro M3, latest Sequoia 15.5, latest Parallels build, just loaded Windows 23H2 July update. Everything seemed to work fine - but I noticed that the machine was still pegged (fan running, temp high). I rebooted the mac, booted back into Parallels/Win11, and it ended up with the same issue. If I run Task Manager, it shows the CPU at 60%, with the highest (and only) task showing as "Task Manager". I've let it sit like this for 30+ minutes, hoping it's some type of setup or cleanup task, but that doesn't appear to be the case.

Something with today's Microsoft Windows update disagrees with Parallels - and it will make it unusable on battery. It may work while plugged in, something clearly isn't working correctly.

 

Exactly the same here - after the update (23H2), running on M3 Max/Sequoia 15.5, my Windows 11 VM in Activity Monitor running at 700% CPU.

Restarted, reinstalled Parallels Tools, Restarted, let it sit for 24 hours, still the same. Not good.

 

I'm seeing the same thing with my setup - MacBook M3