Some things in the real world simply take longer than milliseconds; this is not a failing. I'm working with a system that takes over 10 seconds to get a list of wifi access points, and you bet we throw up a spinner while that's happening.
Now of course if the spinner is merely cosmetic and doesn't represent any actual work going on, that can be a problem especially if the process you're waiting for dies.
Now of course if the spinner is merely cosmetic and doesn't represent any actual work going on, that can be a problem especially if the process you're waiting for dies.