Site slow when activated

I idea of this plugin is excellent. I activated it and then required authentication for the users endpoint and it made my site extremely slow. Any ideas if this can be fixed. For security reasons I do not want to allow people to view the users endpoint unless they are authenticated. Odd, that shouldn’t affect site performance. What’s the site URL? Or you can e-mail it to me if you don’t want to post it publicly: pete@petenelson.com