LC Speed Boost KSampler (BETA) 🚀

BETA. A KSampler with LC Speed Boost built in: about half the processing time, same VRAM, same detail. Drop it in where your KSampler was. The layout is worked out at a lower resolution, so a seed frames a bit tighter with it on. start_at_step, end_at_step and return_with_leftover_noise work like KSampler (Advanced): stop early with the noise left in and let a regular or ClownShark sampler finish. ClownShark (RES4LYF) samplers are in the sampler list when RES4LYF is installed. Wire a ClownSampler into sampler to use its own settings. Works on Krea 2, Z-Image, Flux.2 Klein, Qwen-Image and Wan. On SDXL-family models, image to image (denoise under 0.9) and inpaint masks it samples like a plain KSampler. Based on SPEED (Xiao, Chao, Yariv and Wetzstein, 2026).

By lonecatone23·Created 2 months ago·Updated about 5 hours ago· 26

model
positive
negative
latent_image
sampler

LATENT

◄speed_boosttrue►

◄grow_at_step4►

◄_gap1►

◄seed0►

◄steps10►

◄cfg1.0►

◄sampler_name▾►

◄scheduler▾►

◄denoise1.00►

◄_gap2►

◄start_at_step0►

◄end_at_step10000►

◄return_with_leftover_noisefalse►

CategoryLC123/sampling

Inputs (18)

Name	Type	Default	Description
model	MODEL		The model used for denoising the input latent.
positive	CONDITIONING		What you want in the image.
negative	CONDITIONING		What you want out of the image.
latent_image	LATENT		The latent to denoise.
speed_boost	BOOLEAN	true	auto = Speed Boost picks the switch step from the schedule (about 2x faster, same quality). grow_at_step = set it yourself below.
grow_at_step	INT	40–200	Used when speed_boost is on grow_at_step: the step where it switches to full resolution. 0 = a plain KSampler.
_gap1	STRING		Layout spacer
seed	INT	00–18446744073709550000	The random seed used for creating the noise.
steps	INT	101–10000	The number of steps.
cfg	FLOAT	1.00–100	How closely it follows the prompt.
sampler_name	COMBO		The sampling algorithm. ClownShark (RES4LYF) samplers are listed too when RES4LYF is installed, and a ClownSampler Selector can be wired in.
scheduler	COMBO		How the noise is removed over the steps.
denoise	FLOAT	1.000–1	1 = a new picture. Lower = image to image (Speed Boost steps aside under 0.9).
_gap2	STRING		Layout spacer
start_at_step	INT	00–10000	Start partway through the steps, like KSampler (Advanced). Above 0, Speed Boost steps aside (the picture is already past the layout steps).
end_at_step	INT	100000–10000	Stop at this step. Hand the rest to another sampler with return_with_leftover_noise on.
return_with_leftover_noise	BOOLEAN	false	enable = stop at end_at_step with the noise left in, for a regular or ClownShark sampler to finish (add_noise off, start_at_step = this end_at_step).
sampleropt	SAMPLER		Optional. A ClownSampler (or any SAMPLER) with its own settings, like eta. Replaces sampler_name.

Outputs (1)

Name	Type	Description
LATENT	LATENT	—