This one time, at band camp, David Cantrell wrote:
A good halfway house might be to use something like Squid to proxy all incoming requests and to cache very common pages, such as the home page, and serve them from the cache instead of hitting the OG code at all. I'd be happy to help with configgering this.
I'm not a caching expert by any stretch but I don't see how this would work. Squid would ask the web server if the content has changed, and unless you're publishing out static pages OG will always return that it's changed. Otherwise it's gotta do a database hit to see if it's changed anyway, and on the homepage that means the expensive recent changed database hit.