You can certainly cache it locally and maybe check it once a day/week or something. The data does not change very often, so that's a safe decision.

@RaulHinojosa24 said:
Should I fetch configuration or just save a copy locally?
Hi. I'm currently fetching configuration to get all image sizes so I can render them properly.
I'm wondering if I could avoid that API call and just save a copy locally, less API calls is better for loading speed.
Is it a good idea or are those values changing over time?
I'm also fetching movie/tv genres list. Is it the same case as the configuration?
Thanks :)

Image sizes are here:
https://developer.themoviedb.org/reference/configuration-details

Genres are here:
https://developer.themoviedb.org/reference/genre-movie-list
https://developer.themoviedb.org/reference/genre-tv-list