Two, they may take too long to load onto a client's machine, and they will abort the transfer. Your information will not be distributed. Choose appropriate graphics Choose graphics that truly enhance your message. Don't use graphics just because you can. If you can't think of a good graphic to add, chances are you don't need one anyway.
Photographs can be especially useful in describing something.
If you use photographs, do not use them at their full size. Crop the photographs to include only the relevant portion. Also scale down the photo as small as possible while maintaining the image. This makes the graphics load faster and less likely to distract from the real information. Remember, several smaller photos will tell a better story than one large photo.