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There's also weird bugs/features. Have an animated emoji in the currently active channel. Just one. Put Slack in the background - it's still using 10%-15% of a 2016 MBP CPU. WTF.

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I noticed this a while back too. Switch to a private chat that only contains text when you tab out of a team and it doesn't hog. I think the "don't draw in inactive windows/tabs" feature implemented in most browsers is missing.

Even without the optimisation - I recall seeing animated gifs on older hardware without a huge cost. What is it doing? It's like when Google Play Music takes 20% of my 4-thread 1-2GHz i5. I'm pretty sure I listened to MP3s on a Pentium 166 without it pegging the CPU completely.

(And Google Play on Android... on a Nexus 5, I'll sometimes wait 5+ seconds for the playlist to open after clicking the icon.)

> I'm pretty sure I listened to MP3s on a Pentium 166 without it pegging the CPU completely.

I can collaborate that. I remember upgrading from a 486 to a Pentium 166 and being excited that I could finally play 44khz stereo MP3s at full quality and not be constantly skipping. I could even browse the web at 56k at the same time!

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