When working with large Drupal sites which connects to web services, which is protected by IP address or you are lock out by company firewalls. SSH port forwarding (also known as SSH tunnels) can be the solution.

The users browser don't cache static content, if your web-server don't sets the right expire or max-age headers. Drupal sets these headers for static content in the .htaccess file that comes with Drupal, if you have the expire Apache extension enabled.

This post explains how to install the aegir queue runner, so that the tasks will be executed as once.