I bought this game roughly a month ago and can report from my personal experience, there were absolutely no framedrops or stutters ever and planetary rings were absolutely stunning. I remember specifically the very first time I came too close to a ring. I have always been afraid to "crash" into it and one time I pulled away just in time to fly alongside it and I was almost shocked by the beautiful transition into actual asteroids and the amount of detail. That is gone now. Entirely. You can even see the disgustingly low resolution blurr, which is supposed to be the ring, until the very moment you get forced out of super cruise.
Additionally the stuttering has become so bad within stations, it's literally giving me headaches while using Trackir and has reduced my playing time a lot recently.
They haven't improved anything, they haven't fixed anything. They basically just broke things that always worked, as far as I'm concerned.
For the record, since I got this game I have not changed a SINGLE setting in my software, not changed any drivers, not changed, added, removed any hardware whatsoever. Even the ingame settings were setup on my very first launch and never altered again. This is some proper right there.