The spinning rainbow wheel is a common macOS wait cursor. This wheel comes up when an application that you’re running doesn’t respond for a few moments.
Why do I get a spinning color wheel on my Mac?
When you see the spinning colored beach ball, it means the Mac is slowing down due to low resources, such as memory, hard drive or processing power. It’s telling you to wait while the computer chugs through its work. Sometimes, it means the app is “frozen” and unable to continue.
