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internet is now pretty fast and reliableNo, it's not. The bandwidth has dramatically increased, yes, but latency is still quite high. With pure TCP you need the server tick time to be more than the max affordable latency, unless you do packet squishing - which is best done at the client via UDP. The problem is that some info in a game needs to be reliable, while some other needs to be fast. Custom protocols on top of UDP allow for that, as well as a bunch of proprietary ones that give you everything you need in a nice package.t0that is never received, then you send the new world state at timet1, you don't have to wait until the client actually receive the first package, which is already obsolete.