If you host your internet sites on a dedicated server, you would expect that they shall perform very fast and that the access speed to them shall depend only on the Internet connection of the site visitors. Having said that, this will not be the case in the event that the hosting machine has poor network connectivity or employs a network card, which simply can't handle high volume of site traffic. If this is the situation, it shall take a very long time for your websites to load if a lot of people open them simultaneously or visitors might even see error messages. Because of that you might lose customers as in all probability many people will not return to your internet site in the event that they have experienced problems or slow loading speeds. That is why you must pay attention to the network components of any new server that you purchase and not only to the main hardware like Processor, Ram memory or hard drive.