Xcode 12.3 is not responding a few seconds after opening it I updated to Xcode 12.3 on my MacBook Pro 2018 13&quot; yesterday and face a strange problem right now.
Problem: Every time I open up Xcode, it will first work fine. However, after a few actions / seconds, the screen freezes and the circle loading indicator is displayed. The app does not respond anymore and I have to force close it.
More Information:

The freezing is Xcode specific. I can use all other Programs while Xcode is frozen and the circle is spinning. It doesn't seem like a resource problem.

This not only happens with existing projects. I created a new one and encountered the same Problem.

I alredy reinstalled Xcode, but that does not solve the problem.

I already deleted the ~/Library/Developer Folder (like a few other posts recommended) and installed the components on Xcode start again. Still the same problem.


Has anyone an idea on how to solve this problem?
This is a recently reported bug with Xcode 12.3. I am not aware of any response from Apple yet, but you might be able to fix this issue by turning off the over-the-air test device builds.

Top Menu: Window &gt; Devices &amp; Simulators
Uncheck &quot;Connect via Network&quot; for each physical device

I recommend filing bugs with Apple and watching the forum thread about this.
You also revert to Xcode 12.2.