drop in arale web performance metrics around image 419

[kevin gunn]

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.

[Pat McGowan (pat-mcgowan)]

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.

[Michał Sawicz (saviq)]

There's a chance this change influenced the results because now the test is actually being rendered - before, the app was told it's invisible, so if behaved well, it skipped actually drawing things.

[Daniel van Vugt (vanvugt)]

Related to regression bug 1627743 ?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.