MiniMax H3 Video Generation Stalls for 1 Hour on RTX 5090
Johnwick1536 · reddit · 2026-08-10
A developer encountered severe performance bottlenecks while running the MiniMax H3 image-to-video (i2v) model on ComfyUI with an RTX 5090 (96GB DDR5).
When combined with the Spectrum node and Sage Attention, the workflow randomly stalls at 40% or 50% progress. A 25-second video took 1 hour and 20 minutes to generate after getting stuck at 50%. The author is seeking expert advice from the community to resolve this abnormal processing time.
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