Animations vary according to which browser I'm using.
Brave and Firefox no issues, Opera subject to a lot of drag but hey play Ok eventually, Bing freezes some animations but others are OK, not playing on Chrome at the moment but can't recall any issues with animations.
One thing I have noticed on some browsers is a tendency for the game to spend a lot of time loading when moving to another area or when playing animations, saving before then reloading stops the delay. The bat breeder in the dungeon is one example, the mini game is crap first run through but reload and replay and it's fine.