I've been working on the performance of my Drupal site and thought I'd share my results to date in case they might help someone else. My baseline performance using out-of-the-box settings was around 28 requests per second, and the end result is a rate of 68 requests per second.

Just edit .htaccess file in your Drupal root directory. For example, I added the following two lines.

php_value post_max_size 100M
php_value upload_max_filesize 100M
php_value memory_limit 96M (this is vital for Drupal 6)

# PHP 4, Apache 2.