I have 8 Gb RAM and 2 CPU, I install Ubuntu 12.10 on my laptop. The system works strangely. The computer becomes slow for no reasons! I ran top and Htop and there is nothing that uses my CPU or my RAM (I mean nothing that use the whole RAM or CPU). I even change the platform several time(now is Xubuntu). But still it freezes when I do simple things. (Like when I'm editing a document!) But surprisingly when I run a program (that use lots of memory) the laptop functions normal! I have no idea what is the problem! Or how can I find it! I even thought it might be because of Chrome! But the computer freeze even when I'm not using chrome! it freeze for few minutes (the mouse moves really slow, the windows change slowly) and then it's okay for few more minutes!
Can someone tell me what I should do! Or how can I find out what is the problem?