Habe ich alles schon probiert, steht auch in meinem Post "was ich schon gemacht habe". Aber ich habe schonmal die Ursache für das seltsame Verhalten des Spiels gefunden: es ist wieder mal das von allen so geliebte Easy Anti Cheat!
Zitat aus dem Ubisoft Forum: "
First of all, it's a known bug caused by the recent EAC driver update. Many games using Easy anti cheat like Lostark, Apex, Warhammer affected by this bug.
The driver itself is located at C:\Program Files (x86)\EasyAntiCheat\EasyAntiCheat.sys. If you right click it and open it's properties and check the digital signatures tab you can find the timestamp is Nov. 28th,2022 that means the bug version driver.
What this bug will casue is the high CPU usage in System process (ntkernel), you can check that in task manager. In some case, the bug driver even cost more CPU than the game. And what's more, the driver is bugged and cannot unload even you exit the game, that leads to an unkillable division2.exe process.
The only temp fix for players is reboot ( reboot,yes ) your PC to auto unload the kernel mode driver and pray the next time you enter the game wont run into this bug ( about 80% to run into the bug I guess)"