Steve Howell 18771099e4 performance: Introduce new_stream_user_ids. ...

Let
    U = number of users to subscribe
    S = number of streams to subscribe

We were technically doing N^3 amount of work
when we sent certain events, or to be more
precise, U * S * S amount of work.  For each
stream, we were looping through a list of tuples
of size U * S to find the users for the stream.

In practice either U or S is usually 1, so the
performance gains here are probably negligible,
especially since the constant factors here
were just slinging around Python data.

But the code is actually more readable now, so
it's a double win.

2020-10-13 11:28:17 -07:00

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