to anyone looking for somewhere other than Lemmy I'd like to suggest mbin. I'll admit it's not perfect (especially on mobile, interstellar is decent but it's the only app and has some bugs) but it handles reddit-style content pretty much the same as Lemmy except for the lack of read-marking on posts. as a bonus, it handles microblogs so you can see those without an account on mastodon or something similar.
What bugs/issues does Interstellar have that you would like to see fixed? I'm Interstellar's developer btw. I tried to get the majority of the know bugs fixed in the last big update. If there's anything specific you're running into, I can try to focus on that.
the main one I'm still having repeatably right now is that sometimes when I go to post something, especially a comment, the button does not seem to work, so I press it again thinking I missed and it gets posted twice.
I also sometimes have an issue where up/downvoting makes a thing pop up saying "null check operator used on null value". it also happened when trying to unfollow a community from an instance I had recently blocked.
That was something I specifically tried to fix in the last update (the posting button not appearing to work). After the update, almost all buttons that connect to the api have a loading indicator now. Would you be able to verify you are on the latest version: v0.7.1.
I have seen that error before (null check), which I can definitely try to investigate, but I'll likely need more context (such as a post it happens on) to be able to figure out exactly what's causing the issue.
I ran a kbin instance, which kbin forked, and man it was so resource heavy compared to lemmy. Quite expensive to run at scale. Has mbin fork helped with that?