This question is an exact duplicate of:
I use Kali Linux since my first pc and the first version I used version 2017.1 and later updated to 2017.2, then I switched to 2018.3 . That's where I found that my system was getting sluggish. I have done everything to fix it: I installed the latest version 2018.4 is the disaster, I formatted my disk and reinstalled version 2017.2 but nothing changes.
The cursor stops from time to time when I seize and this during 5 or 6 seconds, when I try to close a document or a web page it takes 5 or 6 seconds before closing, when I scroll the scroll bar in a site it takes 5 seconds or more before moving; In short, everything I try to do takes time before executing.
What should I do? Where can the problem come from? of my computer? or the system? do I have to reinstall the 2016.2 version of my system?
My computer is a fujitsu series with 8GB of RAM and 500GB of hard disk with intel core i5 processor.