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[Elijah Murphy]

The core failure mode you’re hitting almost always comes down to who owns the transform for root-motioned characters. When a client plays a root-motion clip, the animation is driving the character’s position frame-by-frame, but if your server is authoritative on kinematics, the server’s predicted position and the client’s animation-driven position will diverge on every non-trivial movement. The tell-tale sign is the “rubber-banding” snap you see on acceleration, deceleration, and any animation that applies lateral velocity the server didn’t predict for—dashes, movement animations with inherent side-step, or animated attacks. The fix isn’t to disable root motion globally; it’s to strip the root-motion velocity contribution out of the animation and feed that delta into your movement query instead, so the server prediction and the client’s animated position share the same kinematic source. Otherwise you’re essentially running two independent movement systems that disagree.

For debugging, stop eyeballing positions and start logging three synchronized values per tick: the server’s last authoritative transform, the client’s predicted transform, and the animation-solved root velocity vector. The moment those three diverge tells you exactly whose system is lying. Most often you’ll find the state machine is

[Elijah Murphy]

Jitter buffering is fundamentally a latency-vs-stability negotiation, and most competitive players completely misunderstand where the tradeoff lives. A static buffer set to 40-60ms sounds safe on paper, but you’re committing that delay permanently regardless of actual network conditions, which is lethal in a fast TTK shooter where 40ms of input lag is the difference between winning and dying. The smarter approach is a dynamic buffer that samples recent RTT variance and adjusts on the fly—targeting the lowest buffer that keeps packet reorder rate under ~2-3%. In my benchmarking, dynamic smoothing held steady at 15-20ms buffers during stable runs and only expanded to 35ms+ during actual network congestion, which is dramatically better than a flat 50ms preset. The catch is the algorithm’s reaction time: if it’s too aggressive, it chases every minor RTT spike and creates a sawtooth delay pattern that’s worse than a static buffer because your game client can never settle.

On the hardware side, most of the jitter you see at low latencies isn’t coming from your ISP—it’s CPU scheduling and NIC processing variance. I disable TCP/UDP offloading flags in

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