Exactly. Just 30 minutes ago I observed delays between me typing text and the text appearing in Slack's text input box. With my bare eyes on an idle system with 32GB RAM and a quad-core i7-6700! It isn't even rare. That's just absurd.
Back around 2012 I would have Empathy (XMPP) always on and I would use GNOME's wonderful "reply in notification" UI to talk to people. It felt snappy and its resource use wasn't noticeable on a laptop with 4GB RAM and a dual-core CPU. Modern chat apps are crap.
Desktop Slack apps are based on Electron and just so you’ll get a sense of the bloat of it - all Electron apps have bundled in drivers for Xbox 360 controllers.
Back around 2012 I would have Empathy (XMPP) always on and I would use GNOME's wonderful "reply in notification" UI to talk to people. It felt snappy and its resource use wasn't noticeable on a laptop with 4GB RAM and a dual-core CPU. Modern chat apps are crap.