I only seem to lag in Halo 5 but its not constant its random and lasts anywhere from 5seconds to 1min. My internet provider is Time Warner cable i have 18 ping 37 download and 6upload. I have looked everywhere and the things i have tried are restarting xbox, internet, game and messed around with port forwarding. If anyone has the same problem please speak up so 343 can do something. I am in the xbox preview program. I know a lot of people are having the same issue so if someone sees a solution on another forum try any spread the word!