It’s always a matter of balancing if you use old equipment to run your server, but thanks to the Apaches, PHPs and MySQLs of this world it can be done. It took me a while to find out where the biggest inefficiencies were on the server. The help of Apache Server monitor was very usefull here. One of the things that improved efficiency was telling Googlebot what to index and what not to index. Fortunatly Googlebot (the spideringtool of Google) visits me up to 100 times a day so it’s important to tell Google what to know. I use robots.txt files to let Google know what is to be done at a certain site.