Perfect orbital lines, completely eliminated the stuttering, the fps almost doubled, the 4K resolution I was able to bring it to ultra and have 60fps synchronized.
The orbit line shader fix isn't the source of any performance differential seen; something else is going on here.
But basically I think this game was never expected to run well on 4K rigs.
In GPU limited scenarios, the game runs fine on all my half-way decent GPUs, given appropriate settings...it's just that there are some remaining incompatibilities with AMD cards and that Odyssey in general has obtrusive aliasing when it comes to high-contrast edges.
Where it doesn't run well, it essentially doesn't run well on anything except faster gaming oriented CPU/platforms, because it's bottlenecked by memory subsystem and lightly threaded CPU performance.