How to avoid reoptimizing all images between builds?

[kwyoung11]

It seems that on each build, all images are re-optimized (not just new images) and this slows down the build. What's the best way to only build images that are not in the .next/static/images folder yet (i.e. new images)? Is there a recommended way to cache these files?

[naavis]

I would like to know too. I'm building a very image-heavy website, and reprocessing images all the time slows down work significantly.

EDIT: After some testing I was able to pinpoint that using the lqip-loader for creating placeholder images causes most of the slowdown.