If you host your sites on a dedicated server, you would expect that they will perform ultra fast and that the access speed to them will depend only on the Internet connection of the site visitors. However, this won't be the case in the event that the server has lousy network connectivity or employs a network card, which simply cannot cope with high volume of traffic. If this is the case, it will take a while for your sites to load if a lot of people open them at the same time or visitors might even see error messages. Therefore you might lose visitors as most probably many people won't return to your website in case they have experienced difficulties or slow loading speeds. This is the reason why you must pay attention to the network components of any new hosting machine you get and not only to the main hardware which includes CPU, Random access memory or hard disk.