Television anime and most donghua are produced at 1080p, so the HD stream is the real one and 4K adds little except for the theatrical films. 480p is the data-saver tier on a phone.
Data
A twelve-episode cour is about six gigabytes in HD and two at 480p; a donghua season of fifty short episodes is about the same. The downloads page explains how to take a season over Wi-Fi.
Buffering
"why does aniwave keep buffering" was a question about the old site's servers; here the video plays on the service you open, and dropping one tier in its player settles a slow connection.
