Anyone else having a problem with Desktop Window Manager hogging a whole load of GPU resources and crashing my frame rate? It’s only started recently but I’m struggling to find a solution.
I can run FS2020 normally in 3D but when I switch to 3D with my Reverb G2, Windows Mixed Reality starts up and triggers DWM to start using up to 100% of GPU and the frame rate drops really low, even when I’m in FS2020 menus.
DWM continues to be a problem even after closing FS2020, until I manually close WMR. Graphics card is an Nvidia Geforce RTX 3090, driver version 511.79
It’s not just Nvidia graphics. I have Radeon 6900 xt and just noticed this yesterday. My flight was somewhat jittery so I had opened HWInfo64 to check my stats. I didn’t notice anything unusual in those stats however after quitting the sim I went away from the computer for 5 minutes. When I came back HWInfo64 was showing my GPU was still running at 80% utilization. Checking task manager I saw it was from “Desktop Window Manager”. I quit the Mixed Reality Portal app and the GPU utilization dropped to normal.
Today I had 2 1-hour long flights and both were extremely smooth. No stuttering at all so it’s not a repeating issue I think.
I think I’ve found the reason: it appears it was a setting in Nvidia control panel. Changing Power management mode to ‘Prefer maximum performance’ and I’ve not had the problem again, yet.
There is definitely a problem with the interaction between MSFS and Mixed Reality Portal (MRP) that results in high DWM GPU usage. The following procedure can be reproduced with consistency:
Start MSFS and wait for it to load the main screen.
Spawn into an airport and stay in PC mode [DWM GPU < 1%]
Now start MRP [DWM GPU < 21%]
Enter VR mode [DWM GPU < 2%]
Exit VR mode, going back to PC mode [DWM GPU > 98%]