I am posting this as I've posted another question that is related to this particular question...
Is a 10.3 MB file a super-huge file in Illustrator CS6? I'm just trying to figure out why my machine is running so slowly; was working well a few days ago when I worked on this particular piece of artwork. I have around seven layers.
Nancy in Tucson
The filesize 10.3 MB is far from unusual (if anything, some here might ask: when do you really start working on it? You may also create a new document of the same size, and then save it without any artwork too see what you actually start with).
There may be many reasons for slowdowns, including other things running. You may (also) have a look at the speed with only Illy working.