On the Windows machine I spent the past year using for work, I absolutely massive (many seconds, and I could induce it to as many seconds as desired, even for minutes) input lag when moving windows around that required me to kill DWM.exe every single day, sometimes multiple times a day.

I didn't permanently kill it like in the article, though. Just killed the process and let it restart.

I don't know for sure that dwm.exe itself was the cause. It could have been an issue with some of the endpoint management crap my employer forces on users, somehow, or maybe MS PowerToys (though I think I eventually ruled that out at some point). But killing dwm.exe fixes it.