I’ve had Slack running on multiple Macs for years. I have plenty of complaints about Slack, but none involve performance. What’s the actual complaint? Do people just look at their memory usage and see Slack taking a lot, and if so, is that actually a problem?

Slack is incredibly slow by any metric.

Startup takes tens of seconds.

Typing messages with formatting is visibly sluggish.

And in common cases it just crash's and restarts.

Memory usage is also an issue if you compare it to the usefulness of Slack.

Just communicating with my team shouldn't take 1/5th of my laptop's resources.

The problem is to install such a distractive application like Slack as an app on your computer. I leave these kind of solutions all in their website so I can control when I want to see messages. So neither accepting desktop notifications. That's nice thing about async messaging solutions, no expectation you respond within in a second.

If they need to talk straight away they can call :)