Sorry, but it's not quite clear to me what the query is. Do you mean you just want to load new information and not all the information contained in the QVD file?
I'm guessing you're dealing with an incremental load and you'd like to load just new info rather than all the historic info or something like that?
Need a bit more clarity before anyone will be able to help!
QVD files typically load pretty fast, unless you are doing transformations on them.
Try using the buffer load statement.
buffer (Stale after 1 day)
Another approach is to separate the static tables and put them into a staging qvw file and use binary load to bring them all in at once. Then load the other changing data after the binary load.