822965 - app startup animation costs 100-200ms in firstPaint

Status: RESOLVED WONTFIX

(Firefox OS Graveyard :: Gaia, defect)

Description

[Zibi Braniecki [:zbraniecki][:gandalf]]

Tested with changes from bug 780692 the startup animation still costs between 100 and 200ms depending on the load.

I don't know which CSS does Homescreen boot transition but I expect it to be affected as well.


firstPaint, avg of 5 cold boots:

           || 63fa5a2 || noanim ||    %
===========||=========||=========||=========
Settings   ||  1508   ||  1398   ||  -7.3%
Dialer     ||  1745   ||  1550   ||  -11.1%
SMS        ||  1647   ||  1523   ||  -7.5%
Email      ||  5048   ||  4963   ||  -1.7%
Calendar   ||  2231   ||  2044   ||  -8.4%
Contacts   ||  1865   ||  1697   ||  -9.0%

Comment 1

[Zibi Braniecki [:zbraniecki][:gandalf]]

Attachment: patch

patch of the code I use to disable animation

Comment 2

[Chris Jones [:cjones] inactive; ni?/f?/r? if you need me]

We should investigate optimizing it in the future, but the animation is a UX-P1 issue so we've decided this overhead is acceptable.

Comment 3

[Zibi Braniecki [:zbraniecki][:gandalf]]

Attachment: updated patch

updated patch that I use

Comment 4

[Zibi Braniecki [:zbraniecki][:gandalf]]

With the better test framework from bug 825137, I retested the impact of noanim patch on the current gaia:


           || master      || noanim      ||    %
===========||=============||=============||=========
Template   ||  1027 (30)  ||   821 (25)  ||  -206
Settings   ||  2685 (265) ||  2283 (140) ||  -401
SMS        ||  1877 (27)  ||  1628 (17)  ||  -248
Calendar*  ||  2626 (103) ||  2578 (641) ||  -47
Email      ||  5511 (290) ||  5369 (134) ||  -141
Contacts   ||  3247 (144) ||  2924 (46)  ||  -323

*) In case of Calendar app I observed many more outliers with slower startup time (in the 3800ms zone) with the patch than without, but too little sample to draw any conclusions.

Based on the trends that I observed, there are apps that get a very clear win when animation is removed - Template app, SMS app, Settings app and Contacts app all received a clear and easy to reproduce boost and a drop in variance on top of that.

The Calendar app did not follow this pattern. The variance actually increased with the animations off, and there were multiple very-slow cases. No idea why.
I'd like to retest it with patch from bug 812396 landing.

Overall, it seems that I'm seeing a greater impact than expected 100ms

Comment 5

[Zibi Braniecki [:zbraniecki][:gandalf]]

In case of Template app: 150ms of that slows down mozbrowserloadstart on the child process (so slows down before the document loading happens), 50ms slows down document loading.

Comment 6

[Dietrich Ayala (:dietrich)]

A lot of how app windows are created has changed over the last year. Probably worth looking to see if this is still valid.

Comment 7

[Nicholas Nethercote [inactive]]

Closing this old B2G bug.