How to fix mac os high sierra, freeze?
I was faced with the same dilemma, it seemed like my MacBook Pro (mid-2015) was 'freezing.' I stumbled across a the fix to it after seeing your post - you can read about it here: https://jrgarrigues.github.io/2017/11/05/high-sierra-freezing/ 

The gist of the linked article is this:


  Reset your NVRAM and the SMC [System Management Controller]
  
  First reset your NVRAM.
  Turn off your Mac. Then turn it on and hold Command+Option+P+R while the computer is booting up. You will
  hear two chimes or on newer MacBook Pro models you will see the screen
  come on and go off twice.
  
  Now, shut your computer down again and reset the SMC [System
  Management Controller].With your Mac off, press Shift+Control+Option and then hold these keys while pressing and holding the power
  button for 10 seconds.