There are not that many LCM checkpoints available as of yet compared to "normal" SD1.5 and SDXL, though indeed a few.
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The point of LCM (Latent Consistency Model) is to be able to run fewer steps and lower cfg scale to cut down on generation time but still get a high quality.
The rule of thumb is 6-12 steps and 1-4 cfg scale. 10 steps and 1-2 cfg scale seems to be good with most models.
I ran a few ckpt compare tests with plot script and I borrowed the prompt of the great
Devilkkw's delicious Cryptid Babe.
SD1.5 LCM 1024x1280 (notice the tendency for conjoined twins):
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SD1.5 LCM 640x960 (notice the absence of conjoined twins):
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There are also XL LCM models. As most know you can use a higher resolution with XL models.
The rule of thumb is that the resolution should be equal to 2048. You can try different ratios. One that I have found to work well for me is 896x1152.
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(Thanks to the eminent
Synalon for providing this list).
SDXL LCM 896X1152:
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A tip is to never use the standard VAE that was released with the first SDXL model, it's slow as hell.
I recommend fenrisxl VAE instead, it's faster. SDXL LCM is till much slower in general though compared to normal SD1.5 or LCM, at least with an older GPU like the 1070 card I have.
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SDXL LCM with fenrisxl VAE 896X1152:
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