Humm, don’t really know the DVD programs and don’t know why they’d be slower, but here are some ideas:
I have a program that tries to contact a time server upon startup to set the time. I know this, as that what’s set in its options. When there’s no Internet connection, it stalls during startup for several seconds. Apparently, it can’t find the server, and eventually gives up (but starts up eventually).
Maybe the DVD programs try to do something like this.
To be sure, you can go to http://www.networkactiv.com/PIAFCTM.html and get a Network Sniffer that now has a fancy name of “PIAFCTM”. Once installed, select Packet Mode, then Start. (you can shut off the annoying beep by unchecking “Make sound for new packets” option.)
I think it shows you IP packets only if you’re connected to the Internet.
It will show you each and every single packet that goes in or out through your PC. If those programs are sending anything, you’ll see from where to where it’s being sent.
You may not be able to tell what exactly they are sending, if the data is encoded in some way.
To be sure that it’s the DVD programs that are sending something, make sure you run only the DVD program, and shut off all others. Otherwise you may see what i.e. your browser or email programs are sending and receiving if they are up and running.