20,000 files? Ooops. Check the preferences that you are only sharing the folders you want. You can add and remove shared foldersin the prefs. The first time you start Limewire, it creates a "hash" (coded list) of the files you want to share. This can take a long time to make the list the first time, and can be very processor intensive. I recall 10 minutes for a even a couple of hundred files/ 5 GB.