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[Bug] z-image-turbo very slow on mac #1030

@bjoernrenzel-optadata

Description

@bjoernrenzel-optadata

Git commit

My MacBook with an M3 chip takes 600 seconds per iteration. With ComfyUI, it only takes 19 seconds per iteration. Is this normal? Or am I doing something wrong?

Operating System & Version

macOS 26.1

GGML backends

Metal

Command-line arguments used

./sd --diffusion-model z_image_turbo-Q3_K.gguf --vae vae.sft --llm Qwen3-4B-Instruct-2507-Q4_K_M.gguf -p "A cinematic, melancholic photograph of a solitary hooded figure walking through a sprawling, rain-slicked metropolis at night." --cfg-scale 1.0 -v --offload-to-cpu --diffusion-fa -H 1024 -W 512

Steps to reproduce

download
https://github.com/leejet/stable-diffusion.cpp/releases/download/master-387-e4c50f1/sd-master-e4c50f1-bin-Darwin-macOS-15.7.2-arm64.zip

unzip

copy models to folder

SET DYLD_LIBRARY_PATH to folder of binary

run
./sd --diffusion-model z_image_turbo-Q3_K.gguf --vae vae.sft --llm Qwen3-4B-Instruct-2507-Q4_K_M.gguf -p "A cinematic, melancholic photograph of a solitary hooded figure walking through a sprawling, rain-slicked metropolis at night." --cfg-scale 1.0 -v --offload-to-cpu --diffusion-fa -H 1024 -W 512

What you expected to happen

Iteration of 20 seconds per step

What actually happened

Iteration of 600 seconds per step

Logs / error messages / stack trace

No response

Additional context / environment details

No response

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