If you can't improve on the old-gen versions, at least do something for PS5 and Xbox Series players (they have issues like that too).
It would be possible to improve the streaming with the SSD? I'm not a developer but I know your engine is old so shouldn't you completely switch to Enfusion? You have the tools so what are you waiting for?
Players are porting DayZ to Arma Reforger so don't let amateurs do a better job than you.