Why is my frame rate so bad on Tsavo Highway?

My friend and I have started marathoning MCC on Legendary for the armor for H5, and we’ve made it through H1 and H2 with no problems, except for the desync bug on H2 Quarantine Zone, but when we got to H3, I get through S117, and Crow’s Nest with absolutely no problems, once I start Tsavo Highway, I instantly have horrible frame rate issues. I know I’m not lagging because I can melee, and throw a grenade and have no delay there, just the frame rate issue. I’ve tried restarting my console as well as my router and there have been zero improvements.

Any ideas or suggestions?