This is accross the network correct? It is likely that the drivers althrough are working are not working bery good based on results. We are assuming that the slowness is the efficiency of the network driver and the network adapter. Can you configure the NDIS driver to run at 100meg half duplex. A lot of NIC cards work better in half duplex when in DOS.
Also the slow down could bee the mass storage controller. How long does it take to create an image when it is saved localy to a different hard drive either internal or external? If it is just as long saving the image locally then the issues are likely with the mass storage controller drivers and you can try a handful of switches for ghost to try and improve the performance.
-noide, -nousb, -fni, -ffx all come to mind as valid switches each to get over a specific issue. Since it is not clear on what issue you are working on you can experiment with each and a combination but that isn't very efficient.
What is genneraly efficient is to use windows pe with the latest vista NIC driver using ghost32.exe. The 32bit OS is way more efficient even if it does take longer to boot up. That is what I would try first.
Cheers.