Apparently faster than NAG

>This node implements Value Sign Flip (VSF) for negative guidance without CFG in ComfyUI. It is designed for object removal in video generation (e.g., removing bike wheels), not for quality improvement. Using prompts like "low quality" as negative could increase quality, but could also decrease it.

https://github.com/weathon/VSF/tree/main/comfyui/custom_nodes/value_sign_flip
https://www.reddit.com/r/StableDiffusion/comments/1mfh3e8/vsf_negative_guidance_for_wan_t2i/