title: Xcode 12.5 Debugger Slow Since macOS Big Sur 11.3 (Native Swift Project)
body: <p>I just updated macOS Big Sur 11.3 today. Nothing is weird until I open Xcode and run my app in simulator. The app launch is becoming veryyy slow and sometimes it crash when there is background thread like URLSession. I have xcode 12.5 before in macOS 11.2.1 and no problem with debugging dan running in simulator.</p>
  <p>These are what I have done so far but still no luck:</p>
  <ul>
  <li><strong>Try create new blank project, problem still exist</strong></li>
  <li><strong>Clean derived data</strong></li>
  <li><strong>Clean project</strong></li>
  <li><strong>Force quit xcode.</strong></li>
  <li><strong>Restart macbook</strong></li>
  </ul>
  <p>These are my assumtion of solution but still have no chance to do right now:</p>
  <ul>
  <li><strong>Reinstall iOS 14 simulator/ install another simulator with different OS version</strong> (I will try this when I am in somewhere with high speed internet connection)</li>
  <li><strong>Reinstall xcode</strong> (Still no high speed internet connection)</li>
  <li><strong>Downgrade macOS and xcode</strong> (Still no high speed internet connection)</li>
  <li><strong>Install di real device</strong> (I have no single iphone)</li>
  </ul>
  <p>Have you experience this? How to solve this problem? I have not tested in real device because I don't have iOS device.</p>