Svgs increase a lot my document size

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I made a book by several svgs.
The total size of the svg files are 12 mb, and every page has a 18kb png on the bottom.
There are 65 pages in total.
Why my file is 60 MB?
The document is so big that the program runs very slowly when I try to edit something....
I'm on a MacBook pro 2011 (High Sierra)