Docker is incredibly good at caching, the assumption that Docker is slow is incorrect. The first time you build or pull an image on a machine, it might take a few to get the base images, but past that it is lightning fast, and it works the same for any language and any stack.<p>For most companies that operate several services, having one trusted and strong way to deploy and orchestrate is way more important than an occasional load&#x2F;build time when working on a new laptop &#x2F; instance.<p>Edit: I&#x27;m not saying Capsule isn&#x27;t useful, it just doesn&#x27;t make any sense to say it compares to Docker, because the use-case is quite different in reality.