Honestly your hardware is massively overkill for the game and I would imagine if you're playing multiplayer you're not the one slowing the game down. It's an unfortunate downside of the game engine being largely single threaded while doing realtime calculations of all projectiles, pathing, veterancy, and so on. If you're doing unranked games then check out the quality of performance mod, and also take a look at this thread talking about an optimization you can do: https://forum.faforever.com/topic/123/guide-fake-fullscreen-and-optimisation/2