Build 417 included the change at lp:1620297 which introduced some sort of timer in qtmir when showing surfaces. I don't see any other changes between 417 and 419 that seem relevant changelogs at http://people.canonical.com/~lzemczak/landing-team/ubuntu-touch/rc-proposed/meizu.en/arale/
The last Oxide release was Aug 29th and dropoff happened after Sep 9. ** Also affects: qtmir (Ubuntu) Importance: Undecided Status: New ** Changed in: canonical-devices-system-image Assignee: (unassigned) => MichaĆ Sawicz (saviq) -- You received this bug notification because you are a member of Ubuntu WebApps bug tracking, which is subscribed to Oxide. https://bugs.launchpad.net/bugs/1625202 Title: drop in performance metrics Status in Canonical System Image: New Status in Oxide: New Status in qtmir package in Ubuntu: New Bug description: please see https://platform-qa-dashboard.canonical.com/dashboard/db/arale-web-browser-and-webapp-container drop in all three Dromaeo Sunspider V8 Granted these tests were run/reported on arale, but the expectation is that this effect will be present across all devices including desktops. To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1625202/+subscriptions -- Mailing list: https://launchpad.net/~ubuntu-webapps-bugs Post to : ubuntu-webapps-bugs@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-webapps-bugs More help : https://help.launchpad.net/ListHelp