I have updated to the release of MacOS 11.0.1/Big Slur and now my MacBook Pro 12 (2016) is getting hotter than heck and sounds like a jet engine. The cause seems to be System Interrupts taking a lot of Win10 CPU cycles. I am on Parallels 16, no updates are offered. I have uninstalled Parallels Tools and reinstalled them, no help. I can reboot Win10 and sometimes it settles down but after a bit of them I go into a overheating again. Two things show High CPU in Activity Monitor, my Win10 VM and then "ncPrwsmac". When I shut down my Win10 VM, ncPrwsmac drops away along with the WinVM. Then my laptop stops feeling like it is on fire and the fans spin down. I have a i9 8 Core CPU with 32GB of memory. I also have the mid level ATI card.
this continues to happen. Often is when I am updating (copy/replacing) software from my company. 1.8k files, 145 folders with a total size of around 3GBs. During this copy/replace the Mac started to get hotter/hotter and fan ramping up to full speed. Not until I rebooted my Win10VM did it settle down, matter of fact as soon as it went to booting up Win10 I could tell the heat difference. Before I rebooted, in Win10 Task Manager Windows Interrupts were pegged 100%.
okay, so here some more infor. When I run up my Linux the CPU usage goes nuts. I have Windows with 2 CPUs and Linux with 1. This did not happen before Big Sur/Parallels 16
