See the original announcement about Drupal 6 Performance Tips’s release in the Drupal news section.
This is a practical and solution-based book designed to help you to quickly discover and learn about specific aspects of Drupal performance that you are interested in. In each chapter, Drupal-based modular performance tips and solutions are investigated and explained in detail. This book is written for Drupal beginners, developers, designers, and webmasters who utilize the Drupal content management system to create robust websites. It provides crucial performance-related information for users of all experience levels, including Drupal module contributors, webmasters who simply configure and maintain Drupal websites, and even Drupal themers.This book expects basic knowledge of Drupal operation, configuration and server technologies, and applications including MySQL and PHP.