I was using liftoff with a lemmy.world account and it was terrible. lots of (badly handled) errors, but all the errors came from the app talking to lemmy.world. So I signed up at a smaller, more local instance (find yours at https://the-federation.info/platform/73), and now it's a mostly fast and error free experience. Lemmy has totally exploded after reddit's suicide, growing from 140K to over 2M users in just a few days.