Lemmy.ml was just upgraded pretty substantially a couple of weeks ago with the first large reddit exodus, so unless there is a ton more monetary support from users, i don't really know that the problem will be solved. It's been like this since the 29th. Jerboa is all but unusable for me unless it's late at night.
Generally it is suggested to jump to a different instance and your performance may improve, lemmy.ml has been way overloaded for a long time
This was happening to me on jerboa with my lemmy.ml account for a week or so; I think the app is still just wigging out due to the influx of users. I'd just wait it out and use the browser on mobile and it will probably come around as I don't have issues with that now. Or try reinstalling?