Updated: Nov 3, 2026
tool
A minimal ComfyUI workflow for Qwen-Image 2.1 on a low-end PC with 8GBvram. Ten nodes, no custom packs, no reference images, no ControlNet.
WHAT YOU NEED (4 files)
- models/diffusion_models/ -> Qwen GGUF Q4
- models/text_encoders/ -> Qwen3-VL 8B int8
- models/vae/ -> Qwen Image VAE
- models/loras/ -> lightning 4-step LoRA
The GGUF loader is built into ComfyUI — no extra extension needed.
THE FOUR NUMBERS THAT MATTER
Steps 8 · CFG 2.0 · Lightning LoRA 0.5 · euler / simple
Sizes: 1024x1408 · 1408x1024 · 1024x1024.
Speed mode: 4 steps / CFG 1.0 / LoRA 1.0. Twice as fast, but the negative prompt stops working at CFG 1.
PROMPT STYLE — plain language, not tag lists
"a quiet greenhouse at dawn, morning light through fogged glass, rows of potted plants, a wooden bench, soft volumetric light, detailed, cinematic"
What it is unusually good at: legible text inside the image (signs, labels, posters, English or Chinese), photographic depth (glass, haze, reflections), and spatial logic (behind, in front of, reflected in).
TWO THINGS TO KNOW
- CFG 1.0 silently kills the negative prompt. Not weakened — ignored.
- Raise steps before raising CFG. 20 steps at CFG 3 drifts toward photorealism and takes four times as long.
SPEED ON A LOW-END PC
~50 s at 1024x1408 with 8 steps, ~20 s in 4-step mode. First run after a restart is slower.