Your videos upload to a server closer to you.

When you upload a video from your phone, it used to travel all the way across the country to a central server. Now it goes to a server much closer to you first, then syncs from there.

This fixes the long stalls you'd hit on uploads from far away. Your video moves faster and you spend less time staring at a loading bar. It's especially noticeable if you're in a rural area or on a spotty connection.