In the event that you host your sites on a dedicated hosting machine, you would expect that they will perform extremely fast and that the access speed to them will depend only on the Internet connection of the visitors. Having said that, this is not going to be the case in case the server has lousy network connectivity or uses a network card, which just can't deal with high volume of traffic. If this is the situation, it'll take a very long time for your internet sites to load if lots of people open them concurrently or visitors could see error messages. Because of that you could lose visitors as most likely many people won't revisit your website in the event that they have experienced problems or slow loading speeds. This is why you need to pay attention to the network components of any new hosting machine which you acquire and not just to the main hardware like CPU, Random access memory or hard drive.