Ok I think I found the issue. The rocket ship, when it lands causes the game to get more and more laggy overtime. I don't know how to fix this. I destroyed the ship in sandbox and it didn't do anything to the performance issue.
I've reached around cycle 500 in my world with decent fps with no stuttering whatsoever until today. After cycle 513 in my world my game's framerate drops and stutters more than it has ever had. I've had another world (before the release) that was 1500 cycles long and didn't lag so it's definitely not my computer being slow. I've gone back in auto saves but everytime it reaches around that cycle it lags a lot.