- Generally, what are some ways to diagnose why a computer is running so slow? To find out whether it is because of insufficient memory, busy CPU, or some other reasons? What are some distinct symptoms of each cause?
For example, my Ubuntu is now using 1.2 GB out of 1.9 GB RAM, 1.7 GB out of 3.8 GB swap, and Dual core CPU's usage is about 75%. Switching between programs can take long. Sometimes keyboard doesn't respond, but it is fine itself.
I think I have a big lesson. My laptop is Lenovo T400, bought in 2009. It was fast at the time, but it gradually became slow, probably because the internet has changed so quickly, and a lot of memory consuming features have been adopted. So in general, how do you realize you have to update your hardware in time?
Thanks!
smartctl -a /dev/sda
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