In case you host your sites on a dedicated hosting server, you would expect that they will perform extremely fast and that the access speed to them shall depend only on the Internet connection of the visitors. Having said that, this will not be the case in case the hosting server has lousy network connectivity or employs a network card, which simply cannot deal with high volume of site traffic. If this is the case, it'll take a very long time for your sites to load if many people open them simultaneously or visitors may see error messages. As a result you may lose site visitors as most probably many people won't return to your site in the event that they have experienced difficulties or slow loading speeds. That is why you need to pay attention to the network components of any new hosting server which you acquire and not only to the main hardware such as CPU, RAM or hard drive.