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I have had this laptop for about 3 months running Ubuntu and it is now considerably slow performing every function than when I first installed Ubuntu 12.04. I have tried running a virus scanner. I have turned on "preload". I am running "zram". Even tried "bleachbit" but nothing seems to help.

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System performance, as I'm sure you are aware is a very complicated subject.

However, I think that it would be fair to say that at a basic level it's the result of three things;

  1. CPU Utilization
  2. Memory Utilization
  3. Disk Utilization

Use, the information below only as a guide to what May be slowing things down.

Ubuntu has a package called top for monitoring system processes and their CPU and Memory % utilization More information on the top command.

Using top you should be able to identify any processor, or memory hogging tasks.

  1. Open a terminal prompt,
  2. type $ top,
  3. Look at the top processes and their CPU and Memory utilization

Obviously, the list should not add up to 100% of CPU or Memory ;o).

If it does (or close >80%) you may look to increase the resources or reduce the load.

To reduce the load;

  1. Locate the processes that you do not need and make a note of its name,
  2. Exit $ top using (Ctrl-C),
  3. Get the process details, type $ sudo ps -ef | grep my-unwanted-process-name,
  4. Stop the unwanted process, type $ sudo pkill my-unwanted-process-name,

Lastly, you may want to also Check Ubuntu 12.04 system requirements.

I hope that this helps to start you in the right direction.

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you can also use htop, gives you a nice overview of what's running and you can configure how it is displayed. – steabert Aug 31 '12 at 7:13
Deleting 100 and more gigabytes helped me ;) – Aleksandar Aug 31 '12 at 7:23

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