title: Python Slow with macOS Mojave 10.14
body: <p>I'm using Python 2.7.3 on recently installed macOS 10.14 (Mojave).
  The code is running within Nuke by Foundry.</p>
  
  <pre><code>a=nuke.selectedNode()
  b=a['file'].value()
  #b now has path to some file
  u=os.path.split(b) [0]
  u = os.path.normpath (u)
  if u != ".":
      subprocess.Popen(['open', '-R', '%s' % (u)])
  </code></pre>
  
  <p>What I'm trying to do is open Finder window where file is located.
  With previous version of macOS it would open Finder instantly.
  With latest upgrade it take 30-60 seconds to open (sometime it does not even work).</p>
  
  <p>Any help please.
  Thank you.</p>