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The remaining jitter after the in-place DOM rewrite was caused by RSSI fluctuations propagating directly into dot positions on every 200ms update cycle. Two fixes: 1. Client-side EMA (alpha=0.25) on x/y coordinates per device. Each render blends 25% toward the new raw position and retains 75% of the smoothed position, filtering high-frequency RSSI noise without hiding genuine distance changes. positionCache is keyed by device_key and cleared on device removal or radar reset. 2. CSS transition (transform 0.6s ease-out) on each wrapper element. Switching from SVG transform attribute to style.transform enables native CSS transitions, so any remaining position change (e.g. a band crossing) animates smoothly rather than snapping. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>