Tim Abbott ccba1e7c0e cache: Limit which realms we access when filling caches. ...

For realms that don't have any presence-active users, we know for a
fact that there aren't any active clients that will be reloading just
after the server restarts, so we can skip filling the cache with data
related to that realm.

For zulipchat.com, this results in a significant performance
optimization for the recipient and stream caches, and a moderate
performance improvement for the user caches as well.

2018-08-01 14:22:49 -07:00

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