Manjaro is very slow

Hi!
I had installed Manjaro less than a week ago. I did some basic things: install timeshift, create backups, install Chromium and some official programs from official repositories.
But now the system is very slow. Moving a shortcut on desktop takes 2 second. Top command in the terminal shows maximum CPU usage 5-10% in that moment. Sometimes the system slows down so much that I wait 5-20 seconds for the window to expand.

Hardware:

  • Intel® Core™ i5-7300HQ CPU @ 2.50GHz
  • 8 GB RAM
  • 1 TB HDD

What is the problem?
Thanks in advance!

Please read this.:
https://forum.manjaro.org/t/how-to-provide-good-information/874/36