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) => Michał Sawicz (saviq) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1625202 Title: drop in performance metrics To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1625202/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs