Hm I haven't had any issues like that. I do have room sync issues where it takes forever to join a large room, but nothing wrong with the app itself. I'm also using the Electron app across platforms and maybe it handles differently across browsers, but I use the Discord Electron app also.
FWIW, slack has this issue as well. It might because unlike IRC, every DM is a room and has similar resources, and 50 people messaging you is the same as joining 50 rooms and I don't have the patience to "leave" a DM.
