If you host your websites on a dedicated hosting machine, you would expect that they'll perform very fast and that the access speed to them shall depend solely on the Internet connection of the visitors. Having said that, this is not going to be the case in case the hosting machine has poor network connectivity or relies on a network card, which just can't handle high volume of traffic. If this is the situation, it will take a long time for your websites to load if lots of people open them simultaneously or visitors could see error messages. Because of this you may lose customers as probably many people will not revisit your website in the event that they have experienced issues or slow loading speeds. That's why you must pay attention to the network components of any new hosting server that you buy and not only to the main hardware like Central processing unit, RAM or hard disk.