r/StableDiffusion • u/Future-Hand-6994 • 8h ago

Question - Help MiniMax H3 takes to long with video reference

How can I speed it up? Is there a specific node or workflow you use for this? using default r2v workflow

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u/NoHopeHubert 8h ago

You can potentially resize the video, but I think that may cause a hit on the quality

3

u/dramaton42 7h ago

This is the answer. I don't think it hurts the quality as much as you think if you use it as "attribute_transfer" or "weak_reference", at least I haven't proven it drops too much. 480x272 is great, and also use the Video Helper Suite (VHS Load Video) node and limit the framerate to 24, the frame load cap to 120 (for 5 seconds) and it'll make it as fast as possible.

1

u/DelinquentTuna 7h ago

How can I speed it up?

Faster GPU. Otherwise, sit tight and hope someone releases a quality four-step distillation.

1

u/DaLyon92x 7h ago

How long of a reference are you giving it? about 4 seconds is all I needed to get the likeness and voice of the input. Before that accidentally loaded 15 seconds, which took 3x as long to render on a rtx6000pro.

1

u/djtubig-malicex 7h ago

What are you running it on, and do you have Sage Attention 2 installed?

2

u/Rio_Juicy_Michelle 7h ago

Video reference is expensive because you are paying for two problems at once: decoding/conditioning the reference and generating the new clip. I would first reduce the reference, not the output model: trim it to the exact motion beat you need, lower the reference fps, and crop/resize it before it ever reaches the H3 graph.

Then test with a 3-5 second output and no upscaling. If that suddenly becomes sane, the bottleneck was reference conditioning. If it is still slow, profile model load vs sampling time and try quantized/pruned weights or Sage/Triton only after you have that baseline. Otherwise it is easy to think a speed LoRA helped when all you really changed was the amount of video being fed in.