If you host your websites on a dedicated hosting machine, you would expect that they'll perform lightning fast and that the access speed to them shall depend entirely on the Internet connection of the visitors. Having said that, this is not going to be the case if the hosting machine has poor network connectivity or employs a network card, which simply just can't cope with high volume of website traffic. If this is the situation, it will take a very long time for your sites to load if a lot of people open them concurrently or visitors may see error messages. Because of that you may lose website visitors as almost certainly many people will not return to your site in the event that they have experienced difficulties or slow loading speeds. This is the reason why you need to pay attention to the network components of any new hosting server you purchase and not only to the main hardware which includes Processor, Ram memory or hard disk.