Sounds like permissions issues in the user account. Create a test user on the computer and don't connect to any email, appleID, or other account. Then open the app and try it. Does the issue persist? Then it os a problem with the App or the System. Does the issue go away? Then the issue is with the user account settings.
For slowness on a Mac start with clearing the PRAM or SMC. If the issue persists look at Startup items and study what is happening in Activity Monitor.
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