Starting point: so, I have a brand-new laptop with a fresh Win10 and the apps lag while I move windows around the desktop. Great!
The first recommendations were already checked: Win is up to date; graphics driver for the integrated Intel GPU and for the Nvidia one as well. No, I won’t roll back the system and no, a “clean start” won’t fix this either.
Of course, I was also suspicious if the virusscanner or the dockingstation-three-monitor-setup is the issue. But come one: that are just 6 mio pixel and the hardware is top notch.
0. open the “Dell Power Manager” and set the “Temperaturverwaltung” to “Optimiert” (before “Ruhig”)
1. configure via the Nvidia that their GPU shall be the preferred one for apps: “Grundprofil” = “Hochleistungs-GPU”; check as well if any app has preset the integrated GPU (change this!)
2. disable automatic scaling of applications: System > Display. Under the scaling drop-down, select the Advanced scaling settings link. Disable “fix blurry ..”
3. change the display settings to Performance: run “sysdm.cpl” and then “Advanced (Erweitert)” > “Performance (Leistung)” and then put everything to performance (radio button) and just enable “smooth font rendering”
4. change the graphic settings to “High Performance” for all “classic” and “universal” apps:
Problem is, that the dwm.exe and the csrss.exe use GPU0 no matter what you configure.
The idea to disable the integrated Intel GPU via UEFI/BIOS is not possible, because the Nvidia GPU is not a full replacement card, but relies on the iGPU ..