Apple announced that macOS will now run on an ARM-based Apple processor, replacing Intel chips after nearly two decades. The transition to Apple silicon will take place over two years, with Rosetta 2 allowing most Intel-built software to run on Apple silicon. However, certain types of software such as kernel extensions and virtual machine apps may not be compatible. To assist developers during the transition process, a guide has been created, recommending steps such as reviewing official documentation, updating Xcode and dependencies, testing apps with Simulators and real devices locally, and using Instruments or Xcode debugging tools to monitor for crashes or performance issues. Additionally, Apple silicon's ARM architecture requires ensuring compatibility with new architectures, updating dependencies, and potentially recompiling certain tools or utilities. The transition process can be challenging, but the benefits of improved build speed on Apple silicon machines are significant, with some tests showing a 40% reduction in build times.