I&#x27;ve not done any measurements in terms of latency but from my experience an agent on the host will ask the docker daemon to start a new container in the order of seconds after making an API request to ECS that calls for an additional container to be provisioned.<p>I&#x27;d recommend setting up a private registry within EC2 though, otherwise you&#x27;ll have a fairly significant delay while it pulls the image from wherever and incur bandwidth charges for doing so. You&#x27;ll still have some delay while it pulls the image from your registry running on EC2 but not as significant if it were externally hosted.