Drupal performance architecture

CSS Aggregation

Menu caching

Memcache back-end

Configuring Memcache servers

Optimizing Memcache servers

Sharing one memcache server between many Drupal installatins

Advance cache module

Views, blocks, users, comments and node caching

Session caching (myths and facts)

Header caching policy

Caching images by browser

HTML code caching

Java Scripts Ads and caching

Using proxy servers

QueryCache module

What to cache and how to cache

Creating good QueryCache policy

Event cache mechanism

Apache cache

PHP Code Optimization

Zend Optimizer

XDebug and other tools