Spectrum: training-free diffusion sampling acceleration via Chebyshev polynomial feature forecasting. Drop-in KSampler replacement that skips transformer blocks on predicted steps for ~2-3x speedup.
https://github.com/sorryhyun/ComfyUI-Spectrum-KSampler
git clone https://github.com/sorryhyun/ComfyUI-Spectrum-KSampler
comfy node install comfyui-spectrum-ksampler