While making this I discovered a 5x speedup of build context creation with an 18 line patch to docker :) <a href="https:&#x2F;&#x2F;github.com&#x2F;docker&#x2F;docker&#x2F;pull&#x2F;20088" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;docker&#x2F;docker&#x2F;pull&#x2F;20088</a>