1188972 - We checkerboard when scrolling Facebook all the time

Status: RESOLVED DUPLICATE of bug 1256677

(Core :: Graphics, defect)

Description

[(no longer active)]

http://people.mozilla.org/~bgirard/cleopatra/#report=e85a19cd298ab102a65fe9e1d5b794dda87cf04e

Comment 1

[Jeff Muizelaar [:jrmuizel]]

Here's a summary of the profile

22.4% in display list building
13.9% in BuildContainerLayerFor
4.4% in WillEndTransaction
37.7% in DrawPaintedLayer
 - 22% in CanvasBackgroundColor
 - 17.4% in Text
 - 13% in DisplayImage
 - 11% in BackgroundColor
13.6% in ValidateTile

Nothing suggests that we are painting particularly slowly. i.e having 22% of painting in CanvasBackgroundColor (basically memset) suggests that we are painting pretty fast.

I expect the big problems here are the non-paint overhead and the fact that we might be painting too much and not the right stuff.

Comment 2

[Mason Chang [Inactive] [:mchang]]

Side note, this is on OS X. 22% spent in CanvasBackgroundColor still seems too slow. I see chunks of 8ms to paint a background color. That seems really bad. There is even one chunk that is 17 ms, which is a whole frame.