PS4 framerate drops after update

I've been playing this game smoothly since launch on PS4 Pro but immediately after the Season 2 update my game now gets really bad framerate drops to the point of being unplayable. In fact, I have stopped playing it because of this.

Looking online, I see a few others are getting the same, look at the replies to the season 2 announcement on your twitter.

Please can you look into this as soon as possible.