Your computer is now 6 years old and in gaming tech that is considered pretty ancient. It's not terrible, but it ain't great by any means.

Could the game be better optimized? I'm sure it could but devs usually save the serious optimization for when the game is much closer to being 100% done so don't hold your breath. I'd imagine you'd get at least 5-10 more FPS once all is said and done.

Could your aging computer be better though? It sure could.