Improve the real or perceived speed of the site, or monitor performance metrics.

Resque

The php-resque integration module. Based on the https://github.com/resque/php-resque.

Static File Cache

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.

Commerce Checkout AJAX Pages

This module aims to provide better AJAX support for Commerce checkout pages as documented here, https://www.drupal.org/node/1329308.

Max Image Size

This module will resize uploaded images to be below the set dimensions. It is not an image style or other presentation layer module.

Entity Cache Loader

First, we had drush_ecl (which is exclusively a drush plugin). Now, we'll have ECL.

Node Revision Cleanup

There are a couple really good modules out there for periodic revision maintenance and keeping node revisions in check, namely

Pages

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