Open Bug 1515473 Opened 5 years ago Updated 2 years ago

CPU intensive slideshow on http://thesantaclausparade.com/

Categories

(Core :: Graphics, defect, P3)

Product:
Core
Component:
Graphics
Version:
62 Branch
Type:
defect

Tracking

()

Project Flags:
Performance Impact medium

People

(Reporter: miketaylr, Unassigned)

References

(
URL
)

Details

(Keywords: perf, perf:responsiveness, Whiteboard: [gfx-noted]) 

This was originally reported @ https://github.com/webcompat/web-bugs/issues/21436.

STR:

1. go to http://thesantaclausparade.com/
2. click the arrows to transition slides in the carousel

Sergiu recorded a profile: https://perfht.ml/2BxrZAZ
I'm going to assign the "Core: General" component for it.
Component: Untriaged → General
Product: Firefox → Core
Here's a profile on linux with WebRender force-enabled (which is still janky):
https://perfht.ml/2QmcOiy
Whiteboard: [qf] → [qf:p2:responsiveness]
In my webrender profile (comment 2), it looks like much of our time is spent in graphical operations to handle calls from JS into CanvasRenderingContext2D -- i.e. this is perhaps some <canvas> case that we haven't optimized but maybe should.

Vicky compared against Chrome (on Mac), and says this site is much smoother there, so we have room for improvement.
Component: General → Graphics
Keywords: perf
Priority: -- → P3
Whiteboard: [qf:p2:responsiveness] → [qf:p2:responsiveness] [gfx-noted]
Webcompat Priority: --- → ?
Performance Impact: --- → P2
Keywords: perf:responsiveness
Whiteboard: [qf:p2:responsiveness] [gfx-noted] → [gfx-noted]
Webcompat Priority: ? → ---
Severity: normal → S3
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