title: Build extremely slow after upgrade to Xcode 12
body: <p>After upgraded to Xcode 12, the build progress will last for about 10 minutes when the target is a real device. But it's only need less then 1 minutes in Xcode 11 with the same project and the same device.</p>
  <p>When i check the build log, i found the signing progress cost a lot of time</p>
  <blockquote>
  <p>Showing All Messages sent 187539 bytes  received 70 bytes  375218.00
  bytes/sec</p>
  <p>total size is 188006  speedup is 1.00</p>
  <p>Code Signing
  /Users/cc/Library/Developer/Xcode/DerivedData/MarkDaily-abnizdojrgeyrjayljkajexbcxcn/Build/Products/Debug-iphonesimulator/MarkDaily.app/Frameworks/LCNetwork.framework
  with Identity -</p>
  <p>/usr/bin/codesign --force --sign -
  --preserve-metadata=identifier,entitlements '/Users/cc/Library/Developer/Xcode/DerivedData/MarkDaily-abnizdojrgeyrjayljkajexbcxcn/Build/Products/Debug-iphonesimulator/MarkDaily.app/Frameworks/LCNetwork.framework'</p>
  <p>/Users/cc/Library/Developer/Xcode/DerivedData/MarkDaily-abnizdojrgeyrjayljkajexbcxcn/Build/Products/Debug-iphonesimulator/MarkDaily.app/Frameworks/LCNetwork.framework:
  replacing existing signature</p>
  <p>rsync --delete -av --filter P .*.?????? --links --filter &quot;- CVS/&quot;
  --filter &quot;- .svn/&quot; --filter &quot;- .git/&quot; --filter &quot;- .hg/&quot; --filter &quot;- Headers&quot; --filter &quot;- PrivateHeaders&quot; --filter &quot;- Modules&quot;
  &quot;/Users/cc/Library/Developer/Xcode/DerivedData/MarkDaily-abnizdojrgeyrjayljkajexbcxcn/Build/Products/Debug-iphonesimulator/MBProgressHUD/MBProgressHUD.framework&quot;
  &quot;/Users/cc/Library/Developer/Xcode/DerivedData/MarkDaily-abnizdojrgeyrjayljkajexbcxcn/Build/Products/Debug-iphonesimulator/MarkDaily.app/Frameworks&quot;</p>
  <p>building file list ... done</p>
  <p>MBProgressHUD.framework/</p>
  <p>MBProgressHUD.framework/MBProgressHUD</p>
  <p>MBProgressHUD.framework/_CodeSignature/CodeResources</p>
  <p>sent 173429 bytes  received 70 bytes  346998.00 bytes/sec</p>
  <p>total size is 173884  speedup is 1.00</p>
  <p>Code Signing
  /Users/cc/Library/Developer/Xcode/DerivedData/MarkDaily-abnizdojrgeyrjayljkajexbcxcn/Build/Products/Debug-iphonesimulator/MarkDaily.app/Frameworks/MBProgressHUD.framework
  with Identity -</p>
  <p>/usr/bin/codesign --force --sign -
  --preserve-metadata=identifier,entitlements '/Users/cc/Library/Developer/Xcode/DerivedData/MarkDaily-abnizdojrgeyrjayljkajexbcxcn/Build/Products/Debug-iphonesimulator/MarkDaily.app/Frameworks/MBProgressHUD.framework'</p>
  <p>/Users/cc/Library/Developer/Xcode/DerivedData/MarkDaily-abnizdojrgeyrjayljkajexbcxcn/Build/Products/Debug-iphonesimulator/MarkDaily.app/Frameworks/MBProgressHUD.framework:
  replacing existing signature</p>
  <p>rsync --delete -av --filter P .*.?????? --links --filter &quot;- CVS/&quot;
  --filter &quot;- .svn/&quot; --filter &quot;- .git/&quot; --filter &quot;- .hg/&quot; --filter &quot;- Headers&quot; --filter &quot;- PrivateHeaders&quot; --filter &quot;- Modules&quot;
  &quot;/Users/cc/Library/Developer/Xcode/DerivedData/MarkDaily-abnizdojrgeyrjayljkajexbcxcn/Build/Products/Debug-iphonesimulator/MJRefresh/MJRefresh.framework&quot;
  &quot;/Users/cc/Library/Developer/Xcode/DerivedData/MarkDaily-abnizdojrgeyrjayljkajexbcxcn/Build/Products/Debug-iphonesimulator/MarkDaily.app/Frameworks&quot;</p>
  <p>building file list ... done</p>
  <p>MJRefresh.framework/</p>
  <p>MJRefresh.framework/MJRefresh</p>
  <p>MJRefresh.framework/_CodeSignature/CodeResources</p>
  </blockquote>