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Issue 912608 link

Starred by 1 user
Status: Available
Owner: ----
Cc:
pdr@chromium.org
█ alphaome...@gmail.com
chrishtr@chromium.org
vmp...@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: 3
Type: Bug



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RunxxxLifecyclePhase is slow

Project Member Reported by xidac...@chromium.org, Dec 6 
Attached trace report are uploaded from:
https://bugs.chromium.org/p/chromium/issues/detail?id=854451

User attached the trace report and seeing that scrolling is very janky. I looked at the trace, and found that:
RunCompositingLifecyclePhase took 27.688ms in average
RunPrepaintLifecyclePhase took 19.038ms in average
RunPaintLifecyclePhase took 32.45ms in average

User did mention that testing on firefox is much smoother.

The tracing was capture with this site:
https://picclick.com/Optical-Fiber-Optic-Inspection-Scope-400x-Fiber-Microscope125-250mm-252118428566.html
trace_Input Latency.json.gz
4.1 MB Download

Comment 1 by schenney@chromium.org, Dec 6

Status: Available (was: Untriaged)
It's not at all surprising this scrolls slowly. It's got lots and lots of touch event handlers and hundreds if not thousands of overlapping paint layers due to just about everything being explicitly positioned.

Firefox is smoother, verified, though it also starts to slow down as more and more stuff comes in.

I doubt we will explicitly try to optimize for this site. It should benefit from generic changes.
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