Is the server using a lot of swap space? Does vmstat show lots of context switching or swap-ins? Is the load average within reason? What processes are using the most cycles? Does your DBMS have enough working memory? Are web spiders hammering your service?
More generally, look at every aspect of your system and its nearby environment, and see what is most busy and what is most scarce. Performance problems often take a lot of time spent just staring at reports until a pattern emerges. And often you'll fix one problem only to uncover another. -- Mark H. Wood, Lead System Programmer [email protected] Friends don't let friends publish revisable-form documents.
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