Managing large Visio files

Is is better to save multiple tab Visio files (with hyperlinks between) or use separate files?  We have a file that is about 14 MB which has about 10 tabs.  This file needs to be accessed and revised by about 4 people and is located in a SharePoint teamspace.  Would the system work better if each tab was it's own file vs all in one and if so how do we hyperlink to the multiple files?