In the event that you host your sites on a dedicated server, you would expect that they will perform lightning fast and that the access speed to them shall depend solely on the Internet connection of the visitors. Nevertheless, this won't be the case if the hosting machine has bad network connectivity or uses a network card, which simply just can't handle high volume of site traffic. If this is the case, it will take a very long time for your websites to load if a lot of people open them at the same time or visitors may see error messages. Because of that you might lose website visitors as in all probability many people won't return to your website in case they have experienced issues or slow loading speeds. That is why you must pay attention to the network components of any new hosting machine which you buy and not only to the main hardware such as CPU, RAM or hard disk.