If you host your internet sites on a dedicated server, you would expect that they shall perform lightning fast and that the access speed to them shall depend only on the Internet connection of the visitors. Having said that, this will not be the case in case the server has poor network connectivity or relies on a network card, which just cannot deal with high volume of traffic. If this is the situation, it'll take quite a long time for your internet sites to load if many people open them simultaneously or visitors may see error messages. Therefore you may lose website visitors as most likely many people won't revisit your website if they have experienced issues or slow loading speeds. That's why you need to pay attention to the network components of any new hosting server which you get and not only to the main hardware like Processor, Random access memory or hard disk drive.