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They're preparing you to the real-time messaging experience when you're working remote from Mars.

Noticed this today, too. I turned on a computer I haven’t logged in to in 2 months, and clicking a channel took at least 5 seconds to open/load. And then it worked normally after that.

Same here, all channels took 5 seconds to load. I've used Slack on that computer recently though.

I've noticed a big performance drop in the last few weeks as well.

Everything has gotten more sluggish.

There was a performance issue with channel loading, documented here: https://status.slack.com/2023-06-23

Agreed, something changed that made Slack usage across multiple devices much worse. Loading a channel tends to sputter as various state and messages load, messages I already read on different devices change state, it's pretty jarring to watch. The "unread messages" badge is often out of sync.

E: if you reach out to support, they can reset stuck state for you. They were very helpful but didn't sound sure it would work.