Juq-089-mosaic-javhd-today-1230202202-29-19 Min Official

| Issue | Root Cause | Evidence | |-------|------------|----------| | | Lock‑contention on tile‑stitching barrier when all 8 threads converge each frame. | Thread‑dump shows 2‑3 threads waiting ~0.8 ms per frame. | | Latency +7 ms | Decoder queue depth too low for burst‑load on 4K frames, causing occasional back‑pressure. | jvisualvm shows queue size hitting max (5) 12× during test. |