New ComfyUI-ZImageTurboProgressiveLockedUpscale

By vramkickedin | | 2 min read
Colorful muted cards ranging from small to large representing upscaling.

ComfyUI-ZImageTurboProgressiveLockedUpscale is a new custom node for ComfyUI that handles progressive image upscaling through multiple stages. The node takes a different approach than traditional methods by using sigma slicing and tailing instead of typical denoise adjustments.

Developer peterkickasspeter-civit created this tool to solve a personal frustration with complex workflows.

'I worked on it so that I can shrink my old 100 node workflow into 1,'

they explained. The node preserves composition from earlier stages while adding detail at each upscale step.

Streamlined upscaling features

  • Progressive upscaling through multiple stages with adjustable target factors.
  • Sigma slicing technique that tails the last n steps of the schedule.
  • Orthogonal subspace projection to reuse and upscale noise consistently.
  • Optional refine stage using turbo model for final detail enhancement.
  • Single-node design that replaces complex multi-sampler workflows.

Artists and creators working with limited step counts will appreciate how this node maintains image composition across upscale stages. The approach allows each stage to build upon the previous one rather than ignoring earlier work, which helps produce consistent results without manual denoise tweaking.

Practical setup and limitations

The developer notes that Z Image base struggles with very low resolutions like 64x80 or 112x144. Users starting from these sizes either need a compatible LoRA or must sacrifice the first few upscale stages to let the model establish composition. For higher starting resolutions such as 448x576, fewer tail steps are needed since the model can draw proper composition from the start.

The developer recommends using the standard Euler sampler rather than exotic options, as it provides fast results with good quality. Users should keep ModelSamplingAuraFlow values low—starting around 3—to ensure proper sigma scheduling for the tail and refine steps.

Try ComfyUI-ZImageTurboProgressiveLockedUpscale on GitHub.