LCM-LoRA: Unleashing the Speed and Power of Latent Diffusion Models

Latent diffusion models like Stable Diffusion have captivated the AI world with their ability to generate stunning high-resolution images from text prompts. But their Achilles heel has always been speed – with inference times stretching into minutes per image, these models remain impractical for most real-world applications.

Enter LCM-LoRA, a new acceleration module that unlocks the full potential of latent diffusion models. As an open source plugin, LCM-LoRA can boost Stable Diffusion performance by up to 10x with no loss in image quality or diversity.

We’ll dive into how LCM-LoRA achieves these speedups and what it means for the future of AI image generation. Whether you’re a researcher looking to push the boundaries of generative modeling or a startup looking to deploy diffusion models in production, LCM-LoRA is an exciting new tool that removes a major bottleneck for working with these powerful models. Read on to learn how LCM-LoRA is poised to unleash the speed and capabilities of latent diffusion models.

Why does this matter?

LCM-LoRA’s order-of-magnitude speedup for latent diffusion models is a potential game-changer for real-world applications of AI image generation. With inference times reduced from minutes to seconds per image, these models become viable for uses that require fast iteration or real-time response.

For artists and researchers, faster inference means quicker feedback and more productive workflows. Multiple variations and higher resolution images that once took ages to generate are now accessible within seconds. This unlocks new creative possibilities.

For businesses, the improvements in speed open the door to deploying latent diffusion models in production systems and services. Real-time image generation with Stable Diffusion, previously infeasible, now becomes possible with LCM-LoRA. And running diffusion models efficiently on CPUs rather than expensive GPUs greatly reduces infrastructure costs.

More broadly, increased accessibility to fast and capable generative AI will further accelerate progress in this rapidly evolving field. When developers and creators don’t have to wait minutes for results, they can build and experiment more freely. LCM-LoRA helps diffusion models fulfill their potential as versatile creative tools.

In essence, by removing the performance barriers of latent diffusion models, LCM-LoRA has the potential to profoundly impact how these AI systems are used and developed. The leap in speed it enables will shape the next generation of generative applications across industries.

Imagine you’re a chef (the model) trying to learn how to make a variety of dishes. However, you have limited kitchen space (memory) to store all the recipes. Now, you come across a cool technique called “LoRA” that helps you condense and streamline the recipes, making them more efficient.

In the paper, they’re introducing LoRA into a process called LCM, which is like a cooking class for models. By doing this, they’re making it so that the chef (model) can now learn more complex recipes without taking up too much kitchen space (reduce memory overhead).

The diagram shows “acceleration vectors” and “style vectors.” Think of these as special tools that the chef can use. The acceleration vector is like a tool that helps the chef cook faster, while the style vector is a tool that adds a unique touch or flair to the dishes.

What the researchers found is that by combining the acceleration tool from the cooking class with the style tool obtained from another special training session focused on a particular style of cooking, they can create a chef that can quickly whip up dishes in that specific style without needing extra training.

How does LCM-LoRA work?

LCM-LoRA, or Latent Consistency Model-LoRA, is a universal training-free acceleration module for Stable-Diffusion (SD). It can be directly plugged into various Stable-Diffusion fine-tuned models or LoRAs without training, representing a universally applicable accelerator for diverse image generation tasks. LCM-LoRA is based on the concept of Latent Consistency Models (LCMs), which have achieved impressive performance in accelerating text-to-image generative tasks, producing high-quality images with minimal inference steps.

LCM-LoRA can serve as an independent and efficient neural network-based solver module to predict the solution of PF-ODE, enabling fast inference with minimal steps on various fine-tuned SD models and SD LoRAs. It demonstrates robust generalization capabilities across various fine-tuned SD models and LoRAs. LCM-LoRA can be combined with LoRA parameters fine-tuned on specific style datasets, allowing for the generation of customized images with minimal sampling steps. The combination of LCM-LoRA parameters with specific style LoRA parameters enables the model to generate images of a specific painting style without the need for further training. LCM-LoRA represents a novel class of neural network-based PF-ODE solvers module with strong generalization abilities.


To demonstrate the power of real-time latent diffusion models, Martin on X (Twitter) take this example using a new tool called Krea. The artist wanted to take a hand-drawn image and iteratively adjust lighting, perspective, and other elements to refine the image. With Krea’s fast inference speeds, updates reflected in the rendered image within seconds rather than minutes. This allowed for quick experimentation with modifying camera angle, lighting, and more as if working in 3D, but starting from a 2D sketch. According to the artist, this hybrid workflow combining the control of digital 3D with the expressiveness of 2D drawing points to an exciting future. Real-time feedback from AI models like Krea, built on top of accelerated frameworks like LCM-LoRA, will increasingly blur the lines between mediums. Artists can iterate visually without losing momentum, merging imagination and final rendering in an immersive creative flow. While traditional techniques remain essential, these AI tools remove technical barriers and expand the realm of possible expressions.


The speedup enabled by LCM-LoRA is significant across a range of hardware, from consumer laptops to cutting-edge GPUs. To illustrate, generating a single 1024×1024 image with the standard SDXL model takes about a minute on an M1 Mac. With LCM-LoRA, the same result is achieved in just 6.5 seconds.

On a high-end RTX 4090 GPU, LCM-LoRA can generate images in well under a second. Even running on a single CPU core, inference takes just 29 seconds. This massive boost makes real-time image generation viable even on modest hardware.

Below are some benchmark times for different hardware configurations, comparing standard SDXL to the 4-step LCM-LoRA model:

  • M1 Mac: 64s vs 6.5s
  • RTX 2080 Ti: 10.2s vs 4.7s
  • RTX 3090: 7s vs 1.4s
  • RTX 4090: 3.4s vs 0.7s
  • T4 (Colab): 26.5s vs 8.4s
  • A100 GPU: 3.8s vs 1.2s
  • Intel i9 CPU: 219s vs 29s

With throughput increasing dramatically, LCM-LoRA opens the door to new workflows and applications with latent diffusion models. The ability to rapidly generate variations or iterate on prompts is now accessible to all users, not just those with cutting-edge hardware.


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