Starting today, “Discord but smol” gets a fresh set of updates for touch input on the screen that fits in your pocket. Check out everything that’s rolling out to your phone!
It's gotten a lot better lately but it's still not 100% there yet. Push notifications still aren't reliable, I often find myself getting a notification 10+ minutes after I get a message (sometimes more). It also uses too much mobile data because it seems to be updating too many things on startup.
I often find that happens if it notifies a different device first. Discord tries to figure out where you are "active" and notify you only there, so if you do something on a PC with Discord installed, it won't ping your phone until it assumes you're not looking at the PC anymore.
10+ minutes sounds like about the amount of time it takes for discord to recognise you're away (ie. auto-away status). If it thinks you're there (ie. online status), then it shouldn't be also pinging your phone. It's the same as when you have discord on your phone and open and it doesn't ping you with every message while you're already looking at it.
I just had a look at Matrix and it seems that the settings let you choose between Off/On/Noisy. Apps like whatsapp default and keep you stuck on "Noisy".