Steve Howell e804f39f0e performance: Avoid expensive call in stream_data.is_active. ...

Calling `set_filter_out_inactives` is expensive, since we
count up the number of subscribed streams, which iterates
through all your streams, creates a new list of subscribed
streams, then counts them.

In my dev setup, I created 700 streams, and this shaved
about 700ms off of the initial call to `build_stream_list`.

2019-12-30 09:45:46 -08:00

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