Well truely and honestly I'd suggest updating your PC sometimes soon, this game has some outdated stuff.
But since that's probably not an option. Make sure to use WSE2. Or atleast try it out, it can give you FPS boosts, it did to me. Limit your FPS to about 80 or 100. Don't go over that or you'll start to rubberband. So just keep it at a limit. WSE2 allows more graphical options. Just enable it in the launcher