In my opinion w10 & w11 can use resources and cpu better but the UI, DPI, WDDM, Pagination. Memory compression... make the user experience slower losing cpu cycles that's the reason the benchmarks are higher on w10&w11 but general usage and ui is slower. As always, the more new hardware you have the less you won't feel this.
I really don't understand why w10 and w11 can't run file explorer (explorer.exe) and a common browser (chrome / firefox) without lag as in w7, w8 or w8.1.
And the GUI.... I really don't like it... Windows XP and Windows 8 have the best gui, in terms of taking advantage of the screen. and also taskbar and caption buttons and fonts... of course can be tweaked as I have done in another post but one can't be productive with w10 & w11 taskbar.
But I don't want to go offtopic. I try my tweaks with every new windows version and then I try opening programs, dragging new tab on chrome for example and it all has lag drawing... 2D and ui drawing it's slow even on high end hardware. It's not a personal opinion.
Do you remember how did you feel installing Vista on hardware that runs XP? That's how I feel when I install Windows 10 or 11 on hardware that can run windows 8. This is 100% accurate description of how it feels.
In my opinion they are currently inspired by Android and MacOS X (and bit a of Elementary Os maybe) offering all easy and pretty and its own app store. But I'm old school and also NEW is not better when something runs fine. It's all Programmed obsolescence, starting from 2008 hardware, all desktops and laptops with windows 8 / 8.1 can give a good computer usage experience: Word, Excel, Powerpoint, Youtube, Web, Emails... just put SSD on it... but we are all forced to upgrade.... non sense. blackwingcat proved that it is not necessary to have the last operating system to run new versions of MS Office for example. Same happens with One Core api...
Of course it's not all bad, we have tons of gigabytes of ram nowadays and web is bigger than ever and resource usage is really high so they introduced memory compression and cache improvements that aren't present on w7,w8 and w8.1 but.... the lag is the lag. I can see both sides: the good and the bad of all this new Vista aka 10/11 oses... but I can't see nothing bad on w8 and w8.1 only benefits and no lag.