Key Info

A thread by RisingSayak explains how KV caching is incorporated in QwenImage 2.1, separating fixed context from image positions that change at every denoising step, leading to a measured 2.55x speedup.

Highlights

  • KV caching separates fixed context from dynamically changing image positions.
  • Caching the fixed part once makes subsequent denoising steps much cheaper.
  • The technique achieves a 2.55x speedup in image generation.