Well you are right, system animations is separate from the home screen launcher, and i think this is bug not a feature. Also poco launcher works great with same animations speed like system thank u for good answer but unfortunately poco launcher doesn't support navigation bar (full screen indicator) and it has different (old) multitasking system, also no options to open control center with right slide up on lower part of screen.anyway i appreciate your suggestions.

did u got any solution? I'm also on miui 11 QFKMIXM .. i used miui 12 before.problem same like you. now I'm little bit confused about new update . how's that rom bro?