If you re an e-commerce site, your customer satisfaction depends on a great buying experience. That means adequate security. Encrypting web-based traffic consumes so much processing power that even minimal load brings sites down. A single bad experience not only costs you the transaction, but also the customer. A fast, consistent online experience is crucial to e-commerce success.
Most content providers add more web servers.
Expensive and difficult. Or maybe they add specialized cards. Better than before, but still difficult. And it adds more complexity to mission-critical servers. Content Delivery is the newest technology to help you scale your web site.