Tarballs must be compressed in a very particular way to support random access, and even that only works with on-demand decompression using a slow compressor (zl

Tarballs must be compressed in a very particular way to support random access, and even that only works with on-demand decompression using a slow compressor (zlib). In Fly's model this would probably also need to happen inside the container's VM. All together it might save a little one-time startup cost, at the expense of making every other operation on the filesystem much slower for the life of each container.