On viens de tester avec Lm22 un petit truc qui semble bien fonctionner sur sa connexion 2 Mega .
Today i find out that Ubuntu's Firefox packages are compiled and packed with Pango support (You may want to read more about Pango here.) This is quite useless and problematic on Ubuntu so it is better to disable it to gain speed. I am talking about real speeds up to %30 - %40. There are a couple ways to disable it :
1- You can compile Firefox yourself
2- You can compile Firefox via ubuntuzilla
3- Or you can continue reading and finish this title in a couple of seconds 
Open a terminal and edit your .bashrc file :
gedit ~/.bashrc
at the end of that file add the following and save it :
export MOZ_DISABLE_PANGO=1
Restart your firefox ($pkill firefox) and see the difference.
A tester,pour ceux que ca intéresse, merci de vos retours .
