Delta RPMs in Fedora

Gone are the days when we would download whole packages to update into the Fedora system. Delta RPMs only provide downloads of components that have changed over the main RPM available. This has saved me tremendous amount of time as it only downloads deltas versus whole packages. Great piece of work on Fedora! I do not know if Ubuntu supports it. Am still having 179 mb worth of Ubuntu updates getting downloaded since past 2 hours.