The round-4 fused crop loops re-derived each frame's detection image with
one single-row converter call per frame - N host sync points where the
round-3 crop did one batch. The grouped form converts the chunk's gathered
rows in one elementwise pass (bitwise the per-row rows) and is bounded by
the caller's chunk; the paste-fallback row form stays. Pins guard the
conversion count. The paste stage itself is proven byte-equivalent to
32e6628 (dispatch, cores, tails); timed CPU stubs show no superlinear
term in either tree - the real-box burn needs the owner's log to attribute
(the device-mode verdict under real VRAM pressure is the only paste-stage
quantity this diff can move).
WildAi
e2fdbbf453