@Jaymart7 said:

Hi, I have a question about append_to_response Performance

https://api.themoviedb.org/3/movie/157336?api_key={api_key}&append_to_response=videos,images

VS

/movie/{movie_id}
/movie/{movie_id}/videos
/movie/{movie_id}/images

I have a mobile app, as you scroll down it request more details, videos, images individually.
I'm planning to use this append_to_response.
My question is in terms of waiting time is it the same with individual request?

Example:

Individual request: 
get Detail request = 1 second
get Images request = 1 second
get Video request = 1 second

==

`append_to_response` [Detail, images, videos] = 3 seconds

The best person to answer your question is Travis Bell.
He is the creator and manager of TMDb. But I think you're on vacation.
I am not a programmer. So excuse my intrusion.
But I think I can help.
First look at this link for the response time for an API Request, which will only send data.
Including the necessary data, image paths and video IDs.
TMDb Service Status https://status.themoviedb.org/
The response time for my location is:

tmdb-api = Response Time: 24 ms  

In a more basic API Request
https://api.themoviedb.org/3/movie/157336?api_key=THE_KEY
you already receive the Path of the Main Poster and Backdrop.

So I believe that the first API Request may already be the complete one you gave as an example.
https://api.themoviedb.org/3/movie/157336?api_key=THE_KEY&append_to_response=videos,images
You can receive the path of all images and use the paths to request the images themselves.

tmdb-image = Response Time: 273 ms  

I'm not sure but I think it's time for 1 image.
As for the video, you will receive the Vimeo and/or Youtube ID.
I don't know what the response time is.

http://api.themoviedb.org/3/movie/157336?append_to_response=videos,images,reviews,credits,similar = 464ms

VS

http://api.themoviedb.org/3/movie/157336 = 360ms

So if I'm displaying all the details it is better to use append_to_response to improve the user experience? :)

let's also wait for Travis Bell for his opinion :)

In your example above, append_to_response is certainly the way to go. You will not be able to request the videos, images, reviews, credits and similar items within 464ms. Get details is 360ms all by itself. With append_to_response, that's 1 request over the wire for all 6 methods at a cost of only 100ms.