Why is high cfg increasing time of image generation? #2081
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I'm running SDXL models with LCM. As recomended, I set cfg to 1 and time to iterate 1 step is 12seconds. When I trying to change cfg to 1.5 it becomes exactly 2 times slower.
Why is it so? Tested it several times. Even after ComfyUI reloading I have the same results. |
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Replies: 1 comment 2 replies
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cfg 1.0 means the negative prompt is ignored so only the positive noise is predicted which is why it's 2x faster. |
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Is it possible to ignore negative prompt with high cfg? I have almost nothing in negative. |
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Oh, empty negative prompt is around 30% slower. 15 seconds. But even this is good, I think. Thanks. |
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cfg 1.0 means the negative prompt is ignored so only the positive noise is predicted which is why it's 2x faster.