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LTX-2.5 on one GPU: 130 s → 43 s per clip. The fast attention path was silently falling back 384× per clip (profiling write-up)

We profiled LTX-2.5 (image + prompt → 10 s of 1080p with audio) end to end on an RTX PRO 6000 Blackwell , then rebuilt the slow parts. Same model, same picture and prompt, same 600 W power cap, warm runs: Stock ComfyUI: 130.1 s and 19.2 Wh per clip. Ours: 42.9 s and 6.9 Wh : (board power sampled ev…

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  1. 2026-10-19 02:52 · r/comfyui
    LTX-2.5 on one GPU: 130 s → 43 s per clip. The fast attention path was silently falling back 384× per clip (profiling write-up)

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