new diff algorithm that knows more about the kind of data we are pushing – large files containing compiled executables.  Here are the sizes in bytes for the recent 190.1->190.4 update on the developer channel

bsdiff and bspatch are tools for building and applying patches to binary files. By using suffix sorting (specifically, Larsson and Sadakane's qsufsort) and taking advantage of how executable files change, bsdiff routinely produces binary patches 50-80% smaller than those produced by Xdelta, and 15% smaller than those produced by .RTPatch (a $2750/seat commercial patch tool).