Tim Abbott de6f724bc5 middleware: Avoid doing work for statsd when not enabled. ...

This saves about 8% of the runtime of our total response middleware,
or equivalently close to 2% of the total Tornado response time.  Which
is pretty significant given that we're not sure anyone is using statsd
in production.

It's also useful outside Tornado, but the effect is particularly
significant because of how important Tornado performance is.

2019-02-27 17:53:15 -08:00

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