In the event that you host your websites on a dedicated hosting machine, you would expect that they will perform ultra fast and that the access speed to them will depend entirely on the Internet connection of the website visitors. However, this is not going to be the case in the event that the hosting server has lousy network connectivity or employs a network card, which simply cannot cope with high volume of traffic. If this is the case, it'll take a long time for your sites to load if lots of people open them at the same time or visitors may see error messages. Therefore you might lose site visitors as most probably many people will not return to your website in the event that they have experienced difficulties or slow loading speeds. That is why you ought to pay attention to the network components of any new server you get and not only to the main hardware like CPU, RAM or hard disk.