Unsolicited advise@HurricaneWeasel The problem isn't the browser cache but rather that the frontend keeps an internal state which consists of posts, user profiles etc. and never unloads stale data. So over time, as more posts keep coming in, the app just keeps using more and more memory. This can be fixed with a regular refresh, but it's annoying because just switching to the tab will freeze the page for about a solid minute. pl-fe seems to handle this better.
