The game runs like garbage when I load it up, cant even get pass through the loading screen
Perhaps give more examples of your experience. Also, can you try recording some of it happening so it is constructive feedback that can be used to improve the game? I say this because I want o know if your issues differ from the ones others have had with crouching will moving or aiming.
Please see the pinned thread regarding Halo Support and how to submit tickets for issues you may be experiencing.