Dude, just try it. Close your browser and monitor your network traffic. Compile a hello world with a unique text string. Run it. It calls home the first tim

Dude, just try it. Close your browser and monitor your network traffic. Compile a hello world with a unique text string. Run it. It calls home the first time you run it. Then it doesn't. If you are not connected to the internet, it does not call home indeed. Here is a concrete description of this experiment: https://sigpipe.macromates.com/2020/macos-catalina-slow-by-design/ https://sigpipe.macromates.com/2020/macos-catalina-slow-by-d... I just reproduced it on a newly installed macOS 10.15.6