I just wanted to add my name to the list. I'm having the exact same performance issues as everyone else, with the added bonus of my PS5 losing connection to my TV every time I start the game, login, logout and close the game. FFXIV is the only game that does this and it only started happening after the most recent patch.

The performance issues are really strange as the PS5 should be more than capable of maintaining at least 1440p at 60+fps. When the PS5 is in BC mode it doesn't even use all of it's CPU cores so as to imitate a PS4/PS4 Pro, yet the PS4 version is far superior despite the PS5 version having the full capability of the machine at its disposal. It's baffling.