MiniMax H3 open weights run 32 minutes down to 7.2 minutes on an L40S
ashishsanu · reddit · 2026-08-04
A developer benchmarked MiniMax H3 open weights locally on an L40S and cut a 10-second clip from 32 minutes to 7.2 minutes without repacking the checkpoints.
The gains came from three changes:
- Shrinking the transformer by deriving a low-rank basis for the huge modulation projection, cutting about 26 GB.
- Splitting the prompt-encoding phase from denoising so the 32B text encoder and denoiser never occupy the GPU together, which made denoising about 5.9× faster.
- Keeping the video VAE resident when memory allows instead of streaming every leaf module, saving another 25 minutes per render.
They also report peak figures of 38.9 GB VRAM and 46.7 GB unreclaimable system RAM for a full run, and say 64 GB system memory is comfortable.
Related event: MiniMax H3 Local Tests: Benchmark Results and Comparisons Across GPUs(88 posts)→
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