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off-topic: why does slack keep a few gb cache in mac app? most of it is indexeddb data I guess. what kind of data can be held that is really worth being this big?

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It's not just the Mac app. My local storage for slack.com on Firefox currently takes 1.5 GB. It goes up with time and Slack takes longer and longer to open, so every so often I go to preferences and clear it out.

The upside of a larger cache is that everything is more responsive and old threads load faster. What’s the downside?

You can still purchase a laptop with 32GB and 64GB of disk.

That’s a pretty large portion of it for a chat app.

Does it scale based on disk size or does it just grow forever?

It will be in the cache directory on MacOS, which is pruned by the OS when it thinks space is low.

That's not what I'm asking. I wonder what a messaging app does with that much cache. and this is a pretty slow app despite the cache

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