Iirc Out of Bounds video of the game showed an ocean the size of a planet that is constantly loaded ingame, i bet that had a bit to do with the performance of the game. If someone could cut that to even a 1/6 pretty sure the game would perform better
Ferrari is like 1-2h at max, depending on queues, most of the time is inside Port Aventura. I suggest you to enter Ferrari first thing in the morning and then just go to the main park the rest of the day.
You can go to Tibidabo in Barcelona, and there's Port Aventura within train distance too (i suggest you go on weekdays, almost no queues)
https://www.tibidabo.cat/en
https://www.portaventuraworld.com/