Hey WilsonRh,
Thanks for the question. Because Home Sharing utilizes your Wi-Fi connection, the transfer speed is going to vary based on your internet speed. If the import is slugging along, you may want to explore other options of moving your iTunes library (preferably via external drive):
iTunes: How to move your music to a new computer
http://support.apple.com/kb/HT4527
It is also good to note that the Home Sharing option allows you to share music between multiple computers if you continue to use both, but it doesn't create a lasting backup. To create a lasting backup, use an external drive or CDs or DVDs.
Thanks,
Matt M.