Fix splitscreen, it's unplayable bro

So, i sometimes have my friends over to play Halo and stuff, but running splitscreen is a total mess. The frame rate drop is unbearable. Only CE and H2 are bearable. Sometimes Reach when it isn’t forge maps. Halo 3 is a huge mess. It drops to like 10 fps fr lol. I’ve heard this happens to other people but can it be fixed?