Open Bug 1292179 Opened 5 years ago Updated 3 years ago

Large performance slowdown when <canvas> width is greater than 16384


(Core :: Canvas: 2D, defect, P3)

51 Branch





(Reporter: jerryj, Unassigned)



(Whiteboard: [gfx-noted])

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36

Steps to reproduce:

1. Visit
2. click on gear icon
3. under 'background image', set megapixel value to 50
4. notice in display that background image width is >16384

Actual results:

when background image width is >16384, performance all of sudden tanks.

Tested on Dell Inspiron 15 (Intel HD Graphics 5500)

Expected results:

no dramatic slowdown
QA Whiteboard: [bugday-20160808]
Component: Untriaged → Canvas: 2D
Product: Firefox → Core
Ethan, is this related to your current canvas 2d work?
Flags: needinfo?(ethlin)
Whiteboard: [gfx-noted]
I'm not working on canvas 2d work now, so clear the needinfo.
Flags: needinfo?(ethlin)
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