Improve the real or perceived speed of the site, or monitor performance metrics.
The php-resque integration module. Based on the https://github.com/resque/php-resque.
Drupal Static File Cache (SFC) module helps locking down critical cache Bins/CIDs while still allow for a Memcache/DB/[YourCache] fallback for data caching.
This module aims to provide better AJAX support for Commerce checkout pages as documented here, https://www.drupal.org/node/1329308.
This module will resize uploaded images to be below the set dimensions. It is not an image style or other presentation layer module.
First, we had drush_ecl (which is exclusively a drush plugin). Now, we'll have ECL.
There are a couple really good modules out there for periodic revision maintenance and keeping node revisions in check, namely