Editing ghost images slows down deploying image time as ghost images (gho/ghs) become fragmented.
This fragmentation is caused due to add/remove/modify of files done from Ghost Explorer.
To increase performance, open modified gho files in Ghost Explorer. Goto File > Compile.
Save As Dialog box will appear.
Write the file name and click on Save button.
Ghost Explorer will compile the image and will create a new image.
Use the new image for better performance.