adding lots of filenames to a listbox from a drive

I`m trying to add lot of items to a listbox from a function
that does recursive search on a drive

unfortuanatelly when I have a lot of items (thousands actually) it takes a long time in which the user is unable to do anything

1)is there a way to speed it up
2) how could I do that so many items get added up so user can do whatever and in the mean time the rest of the items get loaded up ... in background or something ...
any general ideas ,suggestions ?
3) would api be faster then native vb routines (I`m using recursive function at the moment) .. if so which ones

thanks

Here's a link to a page (from Brad's VB-32 Programs & Samples website) that has an example.

http://www.mvps.org/btmtz/drvscan/

There's many comments in the code that explain the speed enhancements.