In case you host your sites on a dedicated hosting server, you would expect that they shall perform ultra fast and that the access speed to them will depend exclusively on the Internet connection of the website visitors. Having said that, this is not going to be the case if the server has bad network connectivity or employs a network card, which just cannot cope with high volume of traffic. If this is the case, it shall take a very long time for your sites to load if a lot of people open them simultaneously or visitors could see error messages. Because of this you could lose site visitors as in all probability many people won't return to your site in the event that they have experienced problems or slow loading speeds. That is why you ought to pay attention to the network components of any new server that you get and not just to the main hardware which includes CPU, Ram memory or hard drive.