Use the Devel Module to Analyze Performance

The Devel module provides a set of developer UI tools and code hooks to analyze performance. It also includes a Performance Logging tool to measure PHP's RAM usage per Drupal page.

Note: use Devel on development sites, not on production environments. This module is of course a resource hog and should not be active all the time. You may temporarily use it on live sites to identify problems of course.

Advantages

  • Identify slow database queries
  • Identify slow PHP functions
  • Identify Drupal page RAM consumptions

References