Fetch Menus from Strapi

Hello I want to know how performant it is to have my navbar menu in Strapi, and fetch it before loading my react application.

What are the benefits of doing something like this? Besides giving the website admin the possibility to change the navbar menu dynamically.

This kind of behaviour doesn’t add a delay to the initial load of the website? Should also have some mockdata in case my cms is down?

Thank you !