I’m still finding this site to be unmanageably slow at times. One other trick that’s been suggested is to install eAccelerator to cache the compiled PHP scripts. (WP-cache only caches the output pages.) I’ve now done that. At first glance it does feel like a dramatic speed-up, but we’ll have to see how it handles under load. Please holler if anything seems broken.
The install was shockingly easy for a Unix server program: took me about ten minutes total including time to write this entry. That’s less time than it took me to install PHP in the first place.