Not that it's a bad article (lots of nice detail in there), but the short version of this is: if you're web-serving disk-scale things, use a web server that's d

Not that it's a bad article (lots of nice detail in there), but the short version of this is: if you're web-serving disk-scale things, use a web server that's designed to serve from disk. If you're web-serving memory-scale things, you can use a memory-based web server. Even if you think you're just "caching".