once i tested apc opcode cache plugin was little faster than wp-cache , if i am not mistaken.
so there is an idea to use it with super-cache instead of wp-cache (for users who has commented and others). but i have now understood that wp-cache can be used commonly while apc cache is not.
and it was a little faster, so it probably is not worth(?) to(?) do.
13:58 gmt: this is that apc opcode cache: http://quentin.unblog.fr/wordpress-mu-wpmu/wpmu-caching/wpmu-object-cache-using-apc/
it has other 2 older versions.