Ok fast DL is when you see the filename.bzip downloading whenever you connect to a server, typically its 75% faster to download then non compressed game files and the only compression type supported by source.

a quick synopsis on how its done...
1) admin zips the file and keeps an origonal copy for each that will be downloaded by a connecting client.
2) admin uploads all the unzipped files to the game server.
3) admin uploads all zipped files to a web server in proper...