1.1. Introduction

As electronic business expands all around the world, so do technical problems associated with it. Consequences of surges in volumes of e-business transactions, delays and outages occur as systems and networks become overloaded. Surveys and studies [6] indicate that slow downloading time is one of the most often cited reasons that an online customer leaves a site and looks for another vendor's website instead. Since online companies' entire business depends on the behavior of their sites, long waiting times and unavailability can be disastrous.

Online companies must continuously offer good quality electronic service to avoid losing sales and customers. In any e-business site, whether online brokerage service, merchant, or auctioneer, ...

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