It seems that experience has slowed down, and players are noticing! Multiple players on the official Diablo 4 forums and Discord are reporting a significant halt to experience progression at soon as the mid to early 70s.
After testing, WoWHead has calculated the current rates of experience. Below are two forum posts – one posted by one of Wowhead’s Necromancer writers a few days ago, the other being the most recent post referring to this issue.