cache authenticated handler

Hello.

I create this issue after spending some hours of searchin any complete "to do list" which will tell all steps how to provide Authenticated User Cache and make it as fast as possible.

As far as I know by know there are 2 user-kind of cache:

1. Anonymous - which is pretty easy to provide (boost module is quite enough).
   However probably some cache handler and additional non-drupal software lik APC and other can give greater performance

2. Authenticated Cache
   There is a module like "AuthCache".
   However