macos High Sierra freeze

Hi,

After upgrading to mcos High Sierra I have been experienced unpleasant freezing which I have never seen before. It usually happens when I am surfing in Safari and witching between multiple tabs, at some point the screen completely freezes and nothing moves anymore, the loading thing shows up instead of the mouse pointer and I have to waiting for 5 solid minutes before being able to control my mac again. What could be the problem? I have already tried to format everything completely but not much was achieved, I still have the same problem as before.