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Issue 831768 link

Starred by 1 user
Status: Assigned
Owner:
mheikal@chromium.org
Cc:
dskiba@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Android
Pri: 3
Type: Bug



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Layout inflation happens on UI thread during activity onCreate

Project Member Reported by mheikal@chromium.org, Apr 11 2018 
Layout inflation takes about 200-300ms on lower end devices. It is
currently done during oncreate way early during startup. It is however
not actually needed until much later (initializeCompositor step).

Inflating the layout in a background task should improve startup performance.

Comment 1 by mheikal@chromium.org, Apr 11 2018 

After analysis of trace with and without BG inflating here are the observations. Inflating the real layout takes 200ms however inflating the fake layout takes 75ms.

I feel that the layout inflation time for the fake layout is very high. 75ms for an almost empty layout seems weird but I am not sure what can be done there.
with_patch_2-cold-webapk-10s~40_15.html
10.5 MB View Download
no_patch_3-cold-webapk-10s~40_25.html
11.5 MB View Download

Comment 2 by dskiba@chromium.org, Apr 11 2018 

We don't need fake layout for WebApks though, because there is a splash screen. I think we need to land support for inflating ChromeActivity layout in the background, and then use that in WebApps.

Comment 3 by mheikal@chromium.org, Apr 11 2018 

Good point, I no longer do any fake layout for WebAppActivity and setContentView is now much faster (4ms) however AsyncInitializationActivity is still taking the same amount of time. I am not sure where it is going now.

Current CL here: cl/1008405
output.html
10.2 MB View Download

Comment 4 by mheikal@chromium.org, Apr 11 2018 

After some tracing, WebappActivity.initializeWebappData takes 8ms if a fake layout is inflated but 120ms if no fake layout is inflated. Most of the time is spent idle/blocking.
fake.html
10.6 MB View Download
nofake.html
10.7 MB View Download

Comment 5 by mheikal@chromium.org, Apr 11 2018 

In WebappActivity.initializeWebappData, findViewById(android.R.id.content) takes 86ms if no fake layout is set.
nofake.html
10.9 MB View Download
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