It isn't worse but it's the same. Random stutters, really bad memory leak when using the upgrade system / paint system, bad performance after consecutive extra long races.
Plus I can't play offline, I even changed everything from the ground up and wasted one of those 3 uses you have per 6 months / year but nothing changed.
Congratulations you stumbled upon the (what used to be called) Homestead glitch.
What settings are you running the game at? As far as playing offline goes, the only time I ran into it was caused by a server error. Not sure you can disconnect form the internet and still launch the game.