tccd stuck and taking up lots of cpu
I found this blog post titled: Fix TCCD process consuming high CPU usage when run Xcode.

excerpt


  Using Xcode 8 is really a frustrating experience. When compile swift source files or write code in Sierra(the latest macOS), Xcode frequently freeze. It's nuking productivity. After a long time of searching, I found this is caused by a process named tccd which take up to 70% of CPU usage. What is tccd? It seems to be a access controller that manage the permission to user's contacts. So the solution is quite easy, go to
  
  System Preferences &rarr; Security &amp; Privacy &rarr; Privacy &rarr; Contacts
  
  uncheck Xcode and restart it. Then, it works again.


So it would seem, simply disabling contacts will disable tccd thereby dropping the high CPU load.