Questions about Graphql data

My current site right now fills some elements in the home page (the menu content, some featured posts) from a wordpress backend using graphql. Also every individual page/post will also get its content from there.

How does webstudio "cache" these queries? And for how long? I remember reading something you guys said about increasing the time that info lives. In the designer itself the result of the query pretty much remains until you manually refresh and I wanted to check if there was a way to set the lifespan of that information.
The current site doesn´t change information that often and increasing the life of the information before needing a query to the backend would reduce the load on the backend significantly.

I also would like to know about the call itself to the backend: Is it done by the server that holds the webstudio site itself? or by the browser client? I have been dealing with some unwanted ddos attacks on the site and backend and I am wondering If i can restrict the graphql endpoint to only allow requests from the IP of the webstudio server..

Overall I´m just looking to understand a little better how webstudio retrieves the info from a backend to try to come up with better solutions to keep the site up with less dependency on the backend site.