I am managing to play with decent frame rates over land and sea now (80+ fps over sea sometimes), with few stutters. The trick for me was to simply select the lower screen resolution from the GUI. It means I now have a letterbox screen, but that's fine with me if it means I can play the game. I'm hoping the patch will allow me to revert to max screen res, but we'll see
This is/is going to be such a great game. It's such a shame it launched with such problems. Not the birth Oleg was looking forward to, I'm sure.