The embedded type PDF viewer or PDF Flipbook is the basic and default viewer from DearPDF. These are great to have on-page where the main page about the book or there needs a single PDF to display on the whole page.
Example: Embedded Viewer in a Page
But things change when there are more than one PDF document to display in a single page. A single Embedded viewer or PDF Flipbook consume certain amount of time to load and consumes memory. Thus multiple embedded viewers will increase that page load time and memory consumption additively.