Many sites that get too much traffic from digg create static pages to handle this. Just save the page, you need to make some edits, then upload that static page and redirect traffic to that page with .htaccess, this can help to reduce the server load. It also depends on what type of server you have and how much it is used. A shared server, when the web host start the server, it can handle load better, but they add more sites to it until it reach servers capacity, at this point it will not handle much traffic.