It looks like it's worse on 0.0.34 (more features = more performance penalty), but not upgrading may not work because the backend API is changing in an incompatible way.
If you could try on 0.0.34 and post back here with a video or something, that could help quantify the issue.
Android 13 here. The only bug I habitually notice is that when I load a comment thread, previously loaded comments from an old thread will briefly be displayed. That and when I subscribe to a new community, the button will keep saying Pending until I refresh.
Over all, it's a feature-light app but for the price it's as good as I would ask for. Hopefully some folks will join the dev team as the community grows.