Usability research has shown that the biggest factor in user satisfaction is speed of response. Optimising your website for response speed means people will enjoy using it
But it’s more important than that. The number of Internet users in developing countries is estimated to have quadrupled between 2000 and 2005. These users could access an increasing amount of valuable information.
Yet broadband connections are extremely expensive in the developing world. Most users cannot afford them, so have great difficulty using the many sites designed for high bandwidth connections. No matter how important its content, if a site takes too long to load it becomes unusable.