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.
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;
Use, the information below only as a guide to what May be slowing things down.
Ubuntu has a package called
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;
Lastly, you may want to also Check Ubuntu 12.04 system requirements.
I hope that this helps to start you in the right direction.