Bug#792270: iceweasel: redraw when scrolling sometimes takes several seconds

[Vincent Lefevre]

Control: found -1 38.2.1esr-1
Control: severity -1 normal

On 2015-07-13 14:39:11 +0200, Vincent Lefevre wrote:
> Redraw when scrolling sometimes takes several seconds, while the
> machine is idle. This occurs when scrolling the keyword area on
> the IMDb, e.g.
> 
>   http://akas.imdb.com/search/keyword?keywords=shooting-gallery
> 
> but not always. Once this happens, this always occurs, possibly
> until the keyword area is no longer visible (something like that).
> I've attached a snapshot of this keyword area.

This occurs very often and this is particularly annoying, as it is
so slow that it is more or less impossible to see the whole list of
keywords, and Iceweasel becomes unusable for this task.

This happens both with nouveau and the proprietary nVidia driver,
so that this is not a driver issue.

Currently, it seems to occur only when I have 5 rows of tabs (I'm
using the Tab Mix Plus extension), but not always, so that I wonder
whether this is a real cause (and I don't see why it would matter).

-- 
Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)