You can play the entire series with a monthly subscription. Microsoft Store: Native versions for Windows users.
Go to Options > Graphics and adjust the "HUD Scale" or "UI Scale" if you are playing on a 4K monitor. Lag in Big Battles: Disable "Bloom" and "Anti-Aliasing" in graphics settings.
If you already have the game and are looking for "features" or fixes to improve performance, try these steps: