title: Xcode: Mac freezes while compiling
body: <p>I recently downloaded the Beta version of Xcode 10. I opened an existing project and wanted to start it on a Simulator. But as soon as the Simulator started, may whole mac just froze. I could not do anything. The only thing that worked was moving the mouse. </p>
  
  <p>After rebooting my Mac I thought the freezing was a beta bug in the Xcode 10 Release. So I went back to Xcode 9.4. But when I was using a small playground file, it happened again, while compiling the playground file. After another reboot I tried to recreate the issue with an existing Xcode project I had (the same I used for Xcode 10) but this time the simulator worked without any problems.</p>
  
  <p>I am using:</p>
  
  <ul>
  <li>MacBook Pro 2010</li>
  <li>2.2 Ghz Intel Core2Duo Processor</li>
  <li>16 Gb RAM</li>
  <li>SSD Storage</li>
  </ul>
  
  <p>Is my Mac just too old to work properly with Xcode or does anyone of you knows if this is an issue I can resolve?</p>