I work with a music streaming app, I have mp3 files in a remote location (dropbox). I load url and the audio games. However, it takes time before it actually plays sound, where services such as Spotify, Soundcloud, Apple Music, etc. start playing the sound of the sound millisecond after you click on the song you want to play. It doesn't matter if it's a song you've never played before (as if playing before I think it's a cache).
What is the backside I don't understand …