It looks though ORES is currently deploying large binary blobs from git via scap3. Unfortunately, git does not scale when checking in large binary objects--they do not diff well so git can only pack them but so tightly. Performance quickly becomes an issue.
Scap has the ability to move large binaries about by using git-fat to fetch them over rsync from some source. We should figure out where to fetch these files from so we can have a much smaller (and usable) repository.
Docs on setting up git-fat (don't worry, it's not really archiva-specific).