process time for create a package

Hi,

currently I have a client with large document size (1870k), and this document is combination of several other documents, some of them with signatures, and some of them without . 

I am looking for the option to optimize the process time. does it make difference i separate this documents as smaller ones?

for example, I separated this document into 4 smaller size documents, and I create a package with 4 documents. does it make any difference when creating a package with 4 documents vs. a package with big size of document?

does eSignLive flattern each page as jpeg file no matter this page contains signature or not? 

thanks,

Cindy