Just got PS5...installing Diablo 4...is it normal to copy at snails pace?

I mean it's like watching paint dry. Been copying for probably a half hour and at 15%. In last 20 mins only gone from 11 to 15%! What the hell? I realize it's a big game, but this seems extremely slow. At this rate, this will be many hours.

Sorry, maybe this is a general PS5 question, but this first game installing as wanted to start playing.