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Viewer now measures inter-frame intervals on both clocks (present side and producer side): stddev/p99/max, late-frame counters vs the producer's median interval, and a cumulative LONGRUN summary every 30 s. The addon exposes the producer timestamp (produceMs) for this. Measured on M1 Pro: 50 fps and 25 fps cadences are clean (late frames only at startup; residual jitter is 120 Hz rAF grid quantization, bounded by one display tick), and 4K25 HDR10 PQ/BT.2020 is tonemapped to SDR by mpv before readback at full rate with unchanged copy costs. RESULTS.md carries the tables and HDR-clip repro commands. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>