If you host your sites on a dedicated server, you would expect that they'll perform ultra fast and that the access speed to them shall depend exclusively on the Internet connection of the site visitors. Having said that, this won't be the case in case the server has lousy network connectivity or employs a network card, which simply just can't deal with high volume of website traffic. If this is the situation, it shall take a while for your websites to load if lots of people open them concurrently or visitors might even see error messages. Because of that you might lose visitors as most likely many people won't revisit your internet site if they have experienced issues or slow loading speeds. That's why you need to pay attention to the network components of any new server that you purchase and not only to the main hardware like Processor, RAM or hard drive.