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Surprising given that Slack's performance is something people regularly complain about

Or.... it's not surprising at all.

Surprising because it's probably the lowest hanging fruit possible

I fully agree.

My thoughts are that there must be a lot of low hanging fruit, judging by the way a chat app can rev up my maxed out Macbook Pro.

If you collapse all of the animated GIFs that does significantly reduce resource usage, even when the app isn't in the foreground.