Maybe both. The size of your picture FRAME is 2X3, but I bet the original
image is much larger in dimension and file size. If you took the images on a
digital camera at high resolution (200 to 300 dpi) or scan them at high
resolution then the images could be several megabytes big. If you have a lot
of them embedded in your publisher doc, then your video card may be choking
on trying to redraw them as you scroll. For web sites you want your pictures
to be optimized and sized as small as possible but still look good. The
smaller the picture, the faster it will load. Your 3X5 image might be 2+megs
and it should be probably around 10 to 20 kb at the most for the web. A 2
meg picture will take about 2 minutes to load with a dial-up internet
connection. Print quality images are at a higher resolution...web pictures
should be at 72 to 96 dpi.
If you want to try a simple experiment, select one of your images > format >
Picture > Size tab. Look at the Size, and compare to the Original size, and
then the scale. Ideally if you resize and optimize your picture before
inserting it into the pub page, the scale should be 100%. But that is an
ideal world. The compress graphics tool in Publisher is for the less than
ideal world. It resamples and compresses your original images to fit the
picture frame on the page.
Optimizing and how best to use graphics is one of the most important topics
for web building. At the minimum use the Compress graphics features. If you
have more time then I suggest the following articles:
How to Prepare Images for Your Web Site by Herman Drost :
http://msmvps.com/blogs/dbartosik/pages/80829.aspx
How to Prepare Images for Your Web Site - Part 2 by Herman Drost:
http://msmvps.com/blogs/dbartosik/pages/80828.aspx
And probably the best source I have run across for really understanding
digital graphics:
http://www.scantips.com/
This one you will want to bookmark and go back and study every once in a
while.
As I said, it may or may not be the size of your graphics, but it is worth
compressing them anyway. Also don't forget to check for an update video card
driver. Good luck.
DavidF