I do virtual hosting on ONE ip. Well there's one site that gets extremely high amount of traffic. Am i able to limit this site's maxclient so that ALL the other sites does not feel the great amount of lag and cpu processing. Right now my box is going through so much traffic on one site. Thus making everything lagged. I use ensim control panel to add the site, but i added it wrong so i need a way to limit this manually that it does not lag all the sites on the server.

Can you not now give that site a dedicated IP? Just a thought.