Re. memcache - In Moodle go to Site administration > Plugins > Cache > Configuration. You need to set up a Memcache instance and then point everything to it in the settings right at the bottom of the config page. (From memory)
I'm sure you know, but beware memcache vs. memcached. They are completely difference cache servers with stupidly similar names.
I'm sure you know, but beware memcache vs. memcached. They are completely difference cache servers with stupidly similar names.