ui lag is most likely due to uwp introduction (well its actualy piece of s*** .net but they call it uwp), and changes to DWM they made
so it doesn't always run via GPU acceleration but CPU as well
and if i'm not mistaken, i recall they killed off D2D after win7, so i guess that also makes things slower in some instances...
also in windows 11 its obvious that .net UI runs on top of win32 shell, which is i guess a double killer right there
who knows what else is there underneath all that junk...
they never bothered to get ridd of tablet related crap, so i guess it all runs side by side
honestly i'm happy i'm still on win7
the longer the better