4090 Tested: Ultimate ComfyUI Setup for High-Speed Minimax H3 Video Generation
BigWideBaker · reddit · 2026-08-05
The author shares a ComfyUI configuration guide to significantly boost Minimax H3 video generation speeds on an RTX 4090. Key optimizations include:
- Environment: Using the latest portable ComfyUI, Python 3.13, PyTorch 2.13, and installing KJ nodes directly from GitHub to access the experimental MiniMax H3 Mem Eff Sage Attention Patch.
- Attention Mechanism: Installing Sage Attention via ComfyUI-Sage-EasyInstall.
- Workflow Parameters: Utilizing euler sampler and linearquadratic scheduler at only 15 steps with fp16 accumulation enabled, drastically reducing gen time with little to no quality loss.
- Model: Using the minimaxh3fl2vaprunedint8convrot.safetensors quantized model.
Related event: MiniMax H3 Local Benchmarks: Performance and Optimization Across GPUs(13 posts)→
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