My MacBook Pro freezes up when working with Parallels Desktop 11
Parallels desktop 11 does not support macOS Sierra.

Requirements According to their Knowledge Base:


  Software:  
  
  
  OS X El Capitan 10.11.1 or later
  OS X Yosemite 10.10.4 or later
  OS X Mavericks 10.9.5 or later