Smart feature caching with motion awareness can dramatically accelerate video world models without retraining, but requires adaptive thresholds and blending rather than static feature reuse.
WorldCache speeds up video generation from diffusion transformers by intelligently reusing computed features across denoising steps. Instead of naively reusing old features, it adapts based on motion and visual importance, using blending and warping to keep videos smooth and artifact-free—achieving 2.3× speedup with minimal quality loss.