I looked at the PDFs in question and It appears that because the PDFs you are using are layered with a lot of images they are taking some time to display each page.
What your will need to do it flatten or compress your PDF files using a tool like PDF enhancer.
I looked at the PDFs in question and It appears that because the PDFs you are using are layered with a lot of images they are taking some time to display each page.
What your will need to do it flatten or compress your PDF files using a tool like PDF enhancer.