If you are suddenly receiving a lot of request within a short period of time because you’ve been linked by a large site like Digg or Slashdot, your hosting solution might not be able to handle the load.
This article should help your to prepare your WordPress blog for such a case or if you’re just using a slow webhost and want to improve the general performance.
Note that your room for maneuver is limited in most shared-hosting environments, so you won’t be able to implement all possible options with a $2.95 hosting account.
On the whole there are two areas where we can try to save processing time by caching frequently loaded data. The first one is the server system like the web- and database-server software, the second one is the application (WordPress) itself.
(Read on …)