Quick answer: Unreal Iris prediction drifting after a brief network jitter spike? Iris's prediction window doesn't re-baseline after jitter - call ResetPrediction on the affected actor.
Player teleports backward 50cm after a ping spike. Replication corrects then continues; prediction stays off.
Reset prediction on jitter
Actor->ResetIrisPrediction();Re-baselines the prediction state. Subsequent ticks predict from current authoritative state, not pre-jitter.
Tune prediction window
Per-actor prediction window of 100-150ms covers most jitter. Larger windows feel laggy; smaller miss spikes.
Use rollback for combat
For competitive gameplay, prediction + rollback handles jitter naturally. The cost is implementation complexity.
“Prediction is a guess. Guesses need correction paths.”
If your game targets variable mobile networks, jitter-tolerant prediction is non-optional. Plan it in from day one.