Ran `arc lint --everything --never-apply-patches --xprofile=profile.json` in rP. Compared [[https://secure.phabricator.com/xhprof/profile/PHID-FILE-k4qrjifhmfxkuaef5e7s/?symbol=Future::waitForSockets | before]] and [[https://secure.phabricator.com/xhprof/profile/PHID-FILE-m74verekyuu6eys6s7ad/?symbol=Future::waitForSockets | after]].