I know I've said it before, but this is the most bizarre performance gap I've seen on PC in a LONG time. If not THE worst TBH. I've had slight micro stutters here and there, but nothing that's been annoying or ruined gameplay. It's running buttery smooth in 2K otherwise. When it occurs it's like less than half a second, and then it goes away. I feel like I've noticed it maybe 10-15 times in the 30 hours that I've played.
I think a lot of it has to do with the anti-cheat software on PC, which is why the performance there has been so different compared to other platforms. But, like others have said, PC specs are SO incredibly varied, there are moments where it can be incredibly hard to make performance and optimization as close as possible across every time of system. It's also FS's first true open world title, so while no excuse there's bound to be some issues.
It seems like they've been working on it pretty hard though, so there's that. Just hope people dealing with issues that were super excited about playing can very soon.