[webkit-gtk] extremely slow reflow and/or painting on certain pages (due to xorg xserver 1.16?)

Michael Gratton mike at vee.net
Tue Sep 16 19:28:03 PDT 2014


I'm running Ephy 3.12.1 w/ WebKitGtk 2.4.5 on the current Ubuntu GNOME 
beta. Recently, certain pages started updating *really* slowly, such 
that it takes a second or two before the effects of scrolling or key 
presses are seen. Duck Duck Go's search interface 
<https://duckduckgo.com/> and results lists are two examples. Others 
however are fine, and it's something that can can change dynamically - 
in GMail's message composer, displaying the formatting pop-up toolbar 
triggers the problem, and it goes away when the toolbar is hidden.

It's hard to pin down exactly when the issue started, but I think it is 
related to upgrading to xorg's xserver 1.16.

I thought it may have been related to pages using colours with an alpha 
channel less than 1, but I haven't been able to create a minimal test 
case that reproduces the issue. Does anyone have some suggestions for 
getting some debug info about  reflow/painting times so I can try to 
work out what the problem is?


⊨ Michael Gratton, Percept Wrangler.
⚙ <http://mjog.vee.net/>

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