You mean the apps I use could be the main problem ?
It's right that I sometimes use two or three apps at the same time : GNOME
Mplayer for music and abrowser or midori for browsing for example. I also
often use audacity. Now for example, with midori opened and a movie copying
from my hard drive to a usb stick my cpu is 100% used all the time with half
of my ram memory.
Should I run only one app at a time to have a good speed ? Can adding some
ram fix the problem ?
Concerning my graphics card I renounced using 3D apps until I have no money
for buying an intel one. I can't find any of my graphics cards, even the
olders, on h-node.