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My computer has an old dual-core CPU with 1 GiB of RAM

On normal work, such as using firefox, the CPU usage is more than 50%, and if I open more than couple browser tabs, it happens lag because of the high CPU usage

Is it a normal CPU usage or there's something hung in the system? What can I do about it?

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    You have very little RAM for Ubuntu. Ubuntu needs around 2GB to be "lag free" because it caches a lot of data, and needs more memory to run smoothly than Windows. – Alvar Jul 30 '13 at 11:45
  • did you install Ubuntu 64-bit with that low amount of RAM? I would upgrade the RAM to around 4GB or install Lubuntu. – Alvar Jul 30 '13 at 11:49
  • If you just want to learn C. Install a server version and start coding, you will get much more speed out of the computer without a GUI. Or upgrade the RAM. – Alvar Jul 30 '13 at 11:56
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The main reason for installing a lightweight version of Ubuntu such as Xubuntu or Lubuntu is to get better performance. If you want to get better performance, you should try using a lightweight *buntu version, even if your hardware will support Ubuntu and Unity.

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