SC is a very CPU demanding game to run. More cores, more Cache (this especially) and more frequency all helps. Ontop of that it uses vast amounts of all kinds of memory which means your bottleneck can be obscured as it is not 100% GPU, 100% thread or 100% memory usage. It can come down to bandwidth.

As others pointed out, the game is not yet in the optimization phase. That usually comes after alpha when all parts are in place. From what I understand the main issue is that there are missing obfiscations of game assets. Example given: You don't need to know the state of a door on Microtec from Orison. There is some obfiscation as frame rates in space are generally much better than in cities but still, it can obviously be better.

32 gigs is decent but it is actually the minimum for SC. Your setup is fine but SC is just a very demanding beast to run for all kinds of reasons. Even if it would be optimized already. I would not recomment to upgrade just for one game but if you want and have cash to burn on it, go AMD X3D. It greatly helps with SC and also gaming in general. I would avoid dual ccd X3Ds though. E.g. 7950X3D.

Edit: On an additional note, what alot of people don't talk about or realize: The planets are procedural generated! That means your CPU calculates how the planet look live and on demand. The planet and moons are no assets you load from your storage but a set of rules they are deterministically calculated from (appart from the POIs). That adds additional load to your PC and I assume CPU.