H3 Relay Hires renders a MiniMax H3 take small and finishes it at 1920x1088 in about a quarter of the time of a native render
H3 Relay Hires is a free, MIT-licensed ComfyUI node pack by tazmannner that renders a MiniMax H3 clip at 960x544 and then finishes the same take at 1920x1088 with a small anime upscaler and one DMAD step, keeping the preview's audio. On an RTX 5090 a 5-second clip took about 119 s, against about 503 s for a native 1920 render.
What it does
Pass 1 at 0.5 MP decides layout, motion, acting and audio; AnimeSR, a 1.3 million parameter upscaler trained on H3-style frames, enlarges the frames in about 2 s, and one turbo step from sigma 0.60 redraws the detail. Version 0.3.0 (3 November) adds an input for any ComfyUI upscale model for realistic or painterly clips, and the H3 Fast Tail Sampler takes about 20% off pass 1 without changing the take.
Worth knowing
It is built for 2D anime: ink lines come out at about 3.1 to 3.9 px against 2.2 to 3.0 px for a native render, and very fast action that already melts in the small take stays blurred (the author's de-rope workflow fixes those frames first). It needs MiniMax H3 in ComfyUI with the DMAD 4-step turbo LoRA and a taeh3 loader; the node code is MIT, but the H3 weights are under the MiniMax H3 Community License, which excludes the European Union, the United Kingdom, South Korea and the United States (users there must request a licence from MiniMax).