By default, Docker adds all files as the build context when doing a docker build. Hence, if you have a monorepo like us, your build context is HUGE. Such a big build context is usually a problem when you want to build your Docker images fast, as Docker needs to gather the context before actually building any layer of the image. However, there is also a common pitfall: when you add files to your image using the ADD or COPY instructions, you might add more than you actually need if you are adding directories.