The biggest problem of the OCI Image Spec is that a container cannot be started until all the tarball layers are downloaded, even though more than 90% of the tarball contents are often unneeded for the actual workload.

This session will show state-of-the-art alternative image formats, which allow runtime implementations to start a container without waiting for all its image contents to be locally available.

Especially, this session will put focus on CRFS/stargz and its implementation status in containerd (https://github.com/containerd/containerd/issues/3731). The plan for BuildKit integration will be shown as well.