MiniMax H3 ref2video extremely slow: ~150s per step on RTX 5070 Ti vs ~27s for image2video
Most-Trainer-8876 · reddit · 2026-09-13
A Reddit user running MiniMax H3 ref2video (int8, Turbo LoRA enabled) in ComfyUI on an RTX 5070 Ti 16GB + 64GB RAM reports 150 seconds per step for a 10s 9:16, 0.2MP video with single image+video input, versus only 27s per step for image2video at 10s 0.5MP. They ask whether the massive speed gap is expected or a misconfiguration, seeking troubleshooting guidance.
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