The download speed of any file does not only depend on your own internet connection speed, but also on many different factors such as your LW version (pro or basic), the amount of hosts sharing the file, (just to name a view things.)
For more hints on increasing the download speed read here:
http://www.gnutellaforums.com/showth...download+speed 
Regarding the DVD question, take a look here:
http://www.gnutellaforums.com/showthread.php?t=53593