On Friday May 2nd, 2014, Khalid of 2bits.com, Inc. presented on Drupal Performance.
The presentation covered important topics such as:

Drupal misconception: Drupal is slow/resource hog/bloated
Drupal misconception: Only Anonymous users benefit from caching in Drupal
Drupal misconception: Subsecond response time in Drupal is impossible for logged in users
Drupal misconception: Cloud hosting is more cost effective than dedicated servers

The presentation slides are attached for those who may be interested ...

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