Steve Howell b4470ac8e1 performance: Add get_subscriptions_for_send_message. ...

This new function optimizes how we fetch subscriptions
for streams.  Basically, it excludes most long-term-idle
users from the query.

With 8k users, of which all but 400 are long term idle,
this speeds up get_recipient_info from about 150ms
to 50ms.

Overall this change appears to save a factor of 2-3 in the backend
processing time for sending or editing a message in large, public
streams in chat.zulip.org (at 18K users today).

2021-05-12 08:10:57 -07:00

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