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I am having a problem in my brother's computer- scrolling in pages (no matter what app), and watching youtube videos, and other streaming videos are working slow (playing videos in vlc from my computer works just fine)..

I tried 2 things:

  1. I thought it might be a problem with the GPU driver - so I reinstalled it, nothing changed.

  2. I used Ubuntu Live CD (without installing) to play videos and scroll through pages in order to check whether the GPU is defected - using Ubuntu Live everything works great (I chose Ubuntu because all drivers are pre-installed)

What should I do next to find and solve this problem?

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As a troublshooting step, I suggest trying other browsers (ie, Firefox, Chrome, IE). Let us know if you still have problems with other browsers. –  EntropyWins Mar 28 '13 at 16:29
    
Also, what graphics card do you have? lspci | grep VGA out to reveal this if you don't know. –  Seth Mar 29 '13 at 3:48

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