my experience overall with discord is okay. However, later updates seem unoptimized for older devices. When I've used the app for a while (an hour or two), it starts to lag more and more, from loading messages, sending messages, changing chats, the UI will lag and/or freeze. I'm using an S8+, which has 4gb of ram and should be enough to properly run discord, but it only fixes when the app is closed and restarted. It now comes with the feature of crashing by itself frequently though...