MiniMax H3 FirstBlockCache node cuts ComfyUI generation time 30-33%

Fixed-seed benchmark on RTX 5090 (MiniMax H3 INT8 ConvRot, 0.5 MP, 20 steps) shows generation time dropping from 90.64s to 60.82s (~33%) using a lightweight, dependency-free MODEL patch node for native ComfyUI MiniMax H3.
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