This has been my approach (together with CiviCoop) to load test a big site with CiviCRM where most visitors where expected to login.
Let me know if you would agree with this approach or if you have a better alternative.
Every big drupal site needs load testing before going live.
These are the key questions you should have answered in the final stages before deployment:
The CiviDay for the Benelux in Apeldoorn was visited by about 25 people. Quite a few were new.
The day started with an explanation about CiviCooP bij Erik Hommel. CiviCooP will be a formal organisation where smaller CiviCRM organsations are able to do the work they like most, and cooperating with others for everything else.
Each organisation would then be able to offer the full CiviCRM service (hosting, building, maintenance, custom code, design).