A key issue to always consider when designing a title is the rate at which data transfers from the CD-ROM to your computer. The Multimedia PC standard establishes a minimum transfer rate of 150K per second. That doesn't mean much until you consider the numbers involved with multimedia data.
An uncompressed 256-color, full screen image (640 by 480 pixels) is about 300K in size. Transferring this image from the CD-ROM to the computer at 150K per second takes about 2 seconds—and this doesn't include any seek time or processing time by Windows to display the image.
Compression and read-ahead techniques can reduce the time involved, but the issue remains intact: you have to factor transfer rate into your product design. You might decide to use smaller images with fewer colors. Or you could transfer large images or audio while text is being displayed for the user to read. There are many different ways to work around this issue, but you need to consider them during design.