I really love to use overlays on my digital scrap pages, but it makes the pages so slow to load! Recently, I ran across a video at the My Digital Studio website that explained how to change things a bit and make the pages quicker to load.
Basically, you start a page and put in your background paper and the overlays you want. Then you save it as a jpeg.
Next, you open a new page and go to background papers and choose custom. Then you choose what you just created and it will all be in one piece and now will be your backgroup paper. (If that doesn't make sense, the video shows every step and explains it very well.)