If you host your websites on a dedicated hosting machine, you would expect that they shall perform extremely fast and that the access speed to them shall depend entirely on the Internet connection of the visitors. However, this will not be the case if the hosting server has poor network connectivity or employs a network card, which simply just can't cope with high volume of traffic. If this is the situation, it shall take a while for your sites to load if many people open them simultaneously or visitors could see error messages. Therefore you may lose website visitors as most likely many people will never return to your website in the event that they have experienced issues or slow loading speeds. This is the reason why you should pay attention to the network components of any new hosting machine you acquire and not just to the main hardware which includes CPU, Ram memory or hard disk drive.