One major difference was that C News was written with portability in mind.
The authors claimed that relaynews could process articles 19 times as quickly as B News.
This allowed newsreaders to rapidly retrieve header and threading information with relatively little load on the server.
Virtually all current[update] news servers continue to use this method in the form of the NNTP XOVER command.
Development of C News stopped about 1995, and the package was largely superseded by INN.