Bug#719751: iceweasel takes much CPU time on https://www.touscoprod.com/

[Vincent Lefevre]

On 2013-08-15 08:12:41 +0900, Mike Hommey wrote:
> On Wed, Aug 14, 2013 at 11:59:35PM +0200, Vincent Lefevre wrote:
> > Package: iceweasel
> > Version: 23.0-2
> > Severity: important
> > 
> > Iceweasel takes much CPU time on https://www.touscoprod.com/ (65% on
> > the machine from which I report this bug).
> > 
> > I don't know the cause, but there are scrolling images near the bottom
> > of the page. But CPU usage is almost as high when these images are not
> > visible.
> 
> A site constantly using javascript takes cpu. News at 11.

I disagree. It's Firefox bad use of Javascript (or perhaps something
else) that causes the problem. According to upstream, it's a layout
problem.

BTW, it's up to the clients to protect the user's resources when they
get "bad data". This is called security (causing battery drain is some
form of DoS). Having high CPU usage for a long time is not a normal
use of Javascript, and the user agent must have a way to detect that.

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