Introduction

You’re in an intense online shooter, perfectly lined up for the winning shot. You pull the trigger—but your opponent teleports three feet to the left, and suddenly you’re dead. “Lag!” you shout. But what’s really happening under the hood? The protocol war between UDP and TCP determines whether you experience buttery-smooth gameplay or a slideshow of frustration.

Why TCP Fails at Fast-Paced Gaming

TCP seems like the obvious choice—it guarantees packet delivery, maintains order, and handles retransmission automatically. Perfect for gaming, right? Wrong. TCP’s reliability mechanisms become its Achilles’ heel in real-time multiplayer games.