this has been explored in the beta - ill link the thread. theres a video inside!
TLDR:
ingame animations seem to be missing frames or have stuttery playback while the editor shows smooth animations.
this is true for reforged as well as wc3 classic, all the way back to very old versions - i tested 1.20.
this should be updated or fixed, as it looks really not great with everything else running smooth at over 100 fps on a high refresh rate display.
this will also help the not optimal readability of the game. its a serious consideration for esport aswell.