title: Xcode 9.3 Playground - diagnosticd
body: <p>I noticed every time I launch a Playground in Xcode (version 9.3) a daemon starts in the background and uses more that 100% of my CPU!</p>
  
  <p>I deleted Xcode's cache and its DerivedData folder but no change.</p>
  
  <p>Does anyone know how to resolve this problem?</p>