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Vessels move only when a poll lands, yet enabling the layer held the continuous render loop for its lifetime, so a parked vessels-only scene rendered every frame. The layer now: - requests a frame for every forced visibility pass (new data, selection); - leaves one trailing frame when the camera moved inside the 800 ms visibility cadence, so the view the camera stopped on is evaluated. It is keyed to camera motion alone: the pass's own label publication requests a frame, and scheduling on that looped at ~1.2 Hz; - holds 'ais-vessels' only while focus emphasis is animating. The 80 ms focus pass, which runs while anything is tracked, also skips hidden sprites whose focus state is at rest (new spriteFocusAtRest) and whose alpha is already 1: advancing them changes nothing, and with a 12k worldwide feed they are most of the fleet. Measured: a parked vessels-only scene (headless SwiftShader) went from continuous mode and 28 frames in 5 s to idle and 0; horizon visibility had no mismatches after the camera moved and settled. The focus pass over 12,000 vessels (11,353 hidden) went from ~4.0 ms to ~1.2 ms. Co-Authored-By: Claude Opus 5.5 <[email protected]>