Optimisation

Hello, first of all, please know that I absolutely love your game — it is literally one of the best games I have ever had the pleasure of playing. However, I don't play it as much as I'd like, and the reason is optimization. I own a setup that exceeds the recommended requirements, and while my PC isn't the latest and greatest, it can still run pretty much any game except... Marathon. It is literally the only game I own on which I can't even maintain a constant 60 fps. Whether I'm on LOW or Ultra settings (except for the perimeter) I'm hovering around 50 fps. This is very frustrating because I can see that my GPU never goes above 40% usage. I imagine you've already received feedback on this, so my message is more of a way to check in for any updates. I know the game still looks great even on low settings, but would it be possible to go even lower than that? (I should mention that I have already tried most of the optimizations and tips from the forum)