I want to serve as much content out of memory as possible because you can’t get faster than that.  Google’s pagespeed module did not play nice with suexec or phpexec so I had to take that back out.  Memcached also occasionally corrupted pages, so got rid of that.  Now what I’ve done is created an in memory file system and used apache file caching.  Please notify support@eskimo.com if you see any bad behavior like corrupted css files.