The source code of high-performance clients utilizes a custom built on optimized method handles or lamda factories. When the player moves, a MotionEvent is posted. Modules listening to this event can modify the player's X, Y, and Z coordinates or rotation angles in real-time before the packet is sent to the server. Advanced Networking: Explaining Packet Manipulation
: Utility classes for math, networking, and rendering (e.g., RenderUtil PacketUtil assets/minecraft rise client source code