XCODE CONSTANTLY PHONES HOME

Summary from the TLDR Web Dev newsletter

Slow Xcode builds can often be due to unnecessary connections to developerservices2.apple.com during the "Gather provisioning inputs" phase. This developer blocked these connections with Little Snitch, which sped up builds. He also found that Xcode connects to devimages-cdn.apple.com on launch and appstoreconnect.apple.com whenever an Xcode project is opened, likely to send data to Apple.