Slack recently migrated its web environments into HHVM, and experienced significant drops in latency for all endpoints
Taking PHP Seriously
Keith Adams

The most important question to validate (or not) this phrase is: from what PHP version into HHVM? It’s easy to say you got an improvement moving from 5.x into HHVM, but 7.x is said to be as fast as HHVM, as both share a lot.

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