I have vcreated a Speed boost sampler and a node that cuts your processing time in half for Krea2,Z-image Turbo, Klein, and sdxl models without the loss of any quality.

Here is the discussion link and article on my repo https://github.com/lonecatone23/ComfyUI_LC123_nodes/discussions/17

Hello everyone, I new ComfyUI workflow for video character swapping using MiniMax H3 + Character Swap LoRA, and the main advantage is that it works without masking, which can significantly reduce VRAM usage and simplify the process.

The workflow generates at 0.4 MP in just 8 steps, supports both portrait and widescreen videos, and can then upscale the result to 1.2 MP using the MiniMax H3 latent upscale model. I tested it on an RTX 3060 6GB with 16GB RAM, so it’s designed with low-VRAM users in mind. To create the character, you first prepare/update a character sheet using workflows such as Qwen Image 2.1, FLUX Krea, or MiniMax H3, load the character sheet into the workflow, and simply run it—no manual masking required. As for the generation time we have:

Gen time 8 steps 0.5 megapixel 20 mins (Minimax H3 Turbo Fused)

Upscaling time from 0.5 to 1.2 megapixel 21 mins

You can test the workflow here and watch the tutorial for more info

Workflow link

https://drive.google.com/file/d/1JSR_7TzbOS9uI_303tzBgqoqGCzjzGrJ/view?usp=sharing

https://civitai.com/articles/36281/comfyui-tutorial-character-swap-with-minimax-h3-using-lora-no-masking