Less is Enough: Training-Free Video Diffusion Acceleration via Runtime-Adaptive Caching

TL;DR

EasyCache is a training-free, runtime-adaptive caching framework that significantly accelerates video diffusion models during inference by reusing computations, without requiring offline profiling or extensive tuning.

Contribution

This work introduces EasyCache, a novel, training-free caching method that dynamically reuses computations to speed up video diffusion inference without additional training.

Findings

Reduces inference time by up to 3.3× compared to baselines.

Maintains high visual fidelity with up to 36% PSNR improvement.

Applicable to various large-scale video generation models.

Abstract

Video generation models have demonstrated remarkable performance, yet their broader adoption remains constrained by slow inference speeds and substantial computational costs, primarily due to the iterative nature of the denoising process. Addressing this bottleneck is essential for democratizing advanced video synthesis technologies and enabling their integration into real-world applications. This work proposes EasyCache, a training-free acceleration framework for video diffusion models. EasyCache introduces a lightweight, runtime-adaptive caching mechanism that dynamically reuses previously computed transformation vectors, avoiding redundant computations during inference. Unlike prior approaches, EasyCache requires no offline profiling, pre-computation, or extensive parameter tuning. We conduct comprehensive studies on various large-scale video generation models, including OpenSora, Wan2.1, and HunyuanVideo. Our method achieves leading acceleration performance, reducing inference time by up to 2.1-3.3$\times$ compared to the original baselines while maintaining high visual fidelity with a significant up to 36% PSNR improvement compared to the previous SOTA method. This improvement makes our EasyCache a efficient and highly accessible solution for high-quality video generation in both research and practical applications. The code is available at https://github.com/H-EmbodVis/EasyCache.