The third common delivery method is the hypermedia of the World Wide Web. A designer can create a learning environment very similar to a more conventional multimedia computer based training program, as delivered on CD-ROM or laserdisc. It is even possible to combine Web based hypertext with media distributed to the student on a CD-ROM, thus allowing for flexible content and speedy access to media. The obvious disadvantage being the distribution of the disks. Given that most designers don't have unlimited storage capacity on their computers and that many learners are limited to a SLIP connection it is essential that designers make careful use of media in their programs.
Text is the smallest medium.
An average page of text has between 1500-2500 characters on it. And videos are even larger. Compare this to some average transfer times. A 14,400 baud modem, with a good connection averages 1000 bytes per second transfer. A good ethernet connection will average ten times that speed, or 10,000 bytes per second.