For some teams, it is as fast as the human can load the totes. For example, Team 2122 Team Tators do this. Because they only use one driver, they use two human players. They make conveyor belt-like structure out of upside down totes behind the HP station and the first human player inserts the totes and opens the door, as well as noodles, while the other human player slides them to the first. The only time they stop loading is when the robot goes to stack. They end up making 3 stacks of 6 with containers and noodles.
It is super cool to watch.
Here is a video, but it has subpar quality.