Will there be any graphical performance optimizations coming in a future release?
does the sun rise in the east? 
I think we can safely assume that they will continue optimizing.
Did anything happen in that regard?
I wanted to begin Grim dawn for the very first time and would be glad to have it visually and hopefully physics-wise updated to modern standards and not have the pathfinding and hitboxes of warcraft 3…
Welcome to the forum. 
Zantai: “We raise the bar with every expansion, but a complete visual overhaul of the game would be like a remaster’s amount of work, not just in art assets, but underlying code to take advantage of the latest tech for particle effects and lighting.”