At 1080p? I think the game is three years older than the release date of the card! But then that's another reason why I quit gaming years ago. Developers remain drunk on creating software that exceeds most users' hardware.
This might be just me, but I've always gotten the impression that's not the issue with NMS.
All maxed out, it's not exactly far beyond what other games can do (and yes, I'm talking about the current version). If anything, it's a bit below what I'd expect. Particularly the terrible detail render distance (like grass and such, and no you cant increase it much).
Even my machine gets a bit weird about it, which absolutely shouldnt happen. I've seen the flight sim on high settings work better. And that takes DRASTICALLY more resources and power.
The fact that NMS actually DOES NOT slow down if I put it into VR itself says something as well. Seriously, there's no performance hit that I can notice (and VR is where performance is most important and noticeable)... that shouldnt be.
Something has always just been off about the game, technically.
They're doing a game with really, REALLY extreme feature creep but they tend not to actually fix long-running issues and bugs, because it's time to add more stuff. You should see how often they release expansion-level updates to the game. It's WAY beyond what any sensible dev team should be doing. You cant do that at that rate without constantly breaking stuff.
I love the game and I have a lot of respect for the devs, but they never actually learned to control the feature creep and focus properly, or fix technical issues in general, and it shows. It's a very frequent complaint among the fanbase. All the stuttering and framerate problems and buggy weirdness.
After all, it doesnt matter how much power you have if the underlying core simply doesnt work right.