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ComfyUI-MiniMax-H3-FastVideo

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Two files that let ComfyUI run **MiniMax H3 video generation in 4 steps** using FastVideo's Video Sparse Attention. On a 24 GB RTX 3090 Ti, this drops a 5-second, 0.8 MP clip from ~8 minutes (base, 20 steps) to under 1 minute (draft) or ~2.5 minutes (best quality). Requires the companion custom node — you can't load these with a normal LoRA loader alone. > **Most people should probably use one of the established H3 turbo LoRAs** (e.g. Comfy-Org's official 4-step turbo, lightx2v's 8-step turbo) — they're simpler to set up and don't need a custom node. This project exists for people who want to experiment with FastVideo's sparse-attention approach and see if the speed/quality tradeoff works better for their use case, or for people on older cards (RTX 3090 / 4090) who can't run FastVideo's latest official releases that target Hopper/Blackwell GPUs. Compare and pick what you like. > ⚠️ **Experimental.** Tested on one machine (RTX 3090 Ti). Requires the companion custom node — this is not a drop-in for standard LoRA loading. See the node repo before downloading.

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Monthly input tokens 10 MMonthly output tokens 2 M1 M = 1 million tokens · USD
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ComfyUI-MiniMax-H3-FastVideo

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