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

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

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.