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) => MichaƂ Sawicz (saviq)

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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.

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