iceweasel tab groups: 100% cpu load

[Davide Anchisi <danchisi@gmail.com>]

Hi,

it is very frustrating when I use tab groups in iceweasel, because it is so sloooow.
The problem seems to be xorg which loads the cpu to 100% when displaying and managing tab groups.
I have the same problem on occasional web pages.

My system:
 - cpu: Intel Core2 Duo 64 bit;
 - debian amd64, stable and testing;
 - iceweasel 16.0.2 (but I  had the problem also with version 10.x and previous);
 - video card nNVIDIA quadro135M and nvidia driver (nvidia-kernel-legacy-173xx-2.6.32-3-amd64).

Thanks for any help,

   Davide