Like Mech said, sending in all the original documents will expedite the process. If you only send in the copies, it'll need to get verified and that's gonna elongate the process. Unlike corrupted govt. officials in Nepal, I found those working here portraying themselves as thorough professionals. They were even considerate enough to rectify some errors on my application w/o sending it back to me. 

Bear in mind, the process can take up to 3 months. There's also an option to get it expedited but you'll have to cough up $300 (twice as much as the normal processing fees).