I did some research and it seems this is indeed an Intel chipset issue that is plaguing many new Windows 10 machines. Some newer firmware seems to have the issue, the older Intel firmware doesn’t. Many people don’t realize the memory leak is occurring and when the computer gets slow, they just restart it. I’ve found a good way to reset DWM.exe when this happens. One example of a command line restart is here (for Windows 8, but applicable for 10 too): https://superuser.com/questions/656162/windows-8-restart-desktop-window-manager
There’s also talk about rolling back to an old version of the Intel driver which will also fix the issue: https://answers.microsoft.com/en-us/windows/forum/all/desktop-windows-manager-dwm-memory-leakage-in/c2968fb0-ee26-4483-9f08-dfa19149cd24?page=1
But it seems there were security concerns with it, and I’m not sure I want to take that chance. So…
I’m trying a batch file with this code set to run when Windows starts - will let you know how it goes. Hopefully Intel can patch this soon.