For anyone else browsing the new driver fixed it for me. I am running DDPM with Current version：1.1.1.0028 and the new monitor driver from June 8th(you need to click other formats to download the actual driver and not just a pdf of instructions).I have not had any performance issues for a few days now. So calling this solved.[IMAGE]
I recently (month) started using the DDPM 1.1.1.0017 because I want the KVM feature but the price for enabling that feature is my entire MacBook Pro M1 is unusable after awhile. DDPM uses so much resources that my whole display lags, apps wont open, clicks are not registered, everything is unusable.  And the solution that fixes it instantly is quitting DDPM. I either need to pray the right click menu comes down and I can quit or more likely I'll try to open activity monitor find DDPM right at the top of the CPU list and click it and Force Quit. The absolute second that DDPM is off everything comes back instantly everything works fast again.
U3223QE, MacBook Pro M1/Intel, DDPM 1.1.1, terrible slowness