If you look at Hiphop vs. HHVM there is certainly a significant performance upside in taking advantage of clangs or gccs ability to produce efficient code. I'm

If you look at Hiphop vs. HHVM there is certainly a significant performance upside in taking advantage of clangs or gccs ability to produce efficient code. I'm not sure why Facebook decided to stop maintaining hiphop. Perhaps manageability wasn't great.