Well everything nowadays is slowed down by the 20 abstraction layers, so I wouldn't be that surprised if someone managed to make one slower than a 35 year old calculator.
It also takes about 20 seconds to disable all animations in Windows, which makes it feel as snappy as XFCE (even on my 5-year-old machine).
For what I do now (Office, email, programming using IDE hooked into Docker containers), it really doesn't hinder me to be on a non-*nix OS.
One reason I moved from Windows phone was the massive delay in switching apps.
Now on iPhone the animations are annoying, yes, but they are at least consistent in length, meaning I expect them and know how long to take a (tiny) pause. I know some work is happening that’s being disguised and that’s why they can’t (all) be turned off.