In case you host your websites on a dedicated server, you would expect that they'll perform extremely fast and that the access speed to them shall depend solely on the Internet connection of the website 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 simply just can't deal with high volume of website traffic. If this is the situation, it will take quite a long time for your websites to load if lots of people open them concurrently or visitors may see error messages. Therefore you may lose customers as most probably many people won't revisit your website in case they have experienced problems or slow loading speeds. This is the reason why you must pay attention to the network components of any new hosting machine that you buy and not only to the main hardware which includes Processor, Random access memory or hard disk drive.