FastSD CPU is a high-performance Stable Diffusion inference engine designed to run on consumer CPUs and Intel AI PCs with NPU/GPU support. It leverages Latent Consistency Models and Adversarial Diffusion Distillation to achieve rapid image generation, reportedly producing 512x512 images in under one second on modern Intel hardware. The project provides multiple interfaces including a Qt desktop GUI, a Gradio-based WebUI with advanced features like LoRA and ControlNet, and a CLI tool.