Improve the real or perceived speed of the site, or monitor performance metrics.
This module flushes and rebuilds all caches used on a single page without forcing you to clear all caches on the site.
Add Views time based cache per group.
Top-notch cache invalidation on Acquia Cloud!
Google pagespeed for drupal
Logs access statistics for your site using MongoDB & provide a replacement for the core statistics module.
This module provides a closure table for comments.