You have a very large PDF file with high definition photos. It could be difficult to host on a server. So, to reduce its weight (and its quality of course), you can use ghostscript like this :
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.6 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf
Of course this suppose you use Linux.
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.6 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf
Enjoy!