Performance and Scalability

NOTE: there is a related patch available for boost that we have not yet tested that might make this module unnecessary: https://www.drupal.org/node/2277703#comment-8941407

We have created a custom module called "BOOST BLAST" that is designed to work with boost and expire. If you want something similar for varnish, please have a look at varnish_vanish which was initially a port from boost_blast.

Adds the lazyload XT library and initiates it on configurable selectors and elements.

Installation:
Download LazyLoadxt from https://github.com/ressio/lazy-load-xt/ and install at sites/all/libraries/lazyloadxt/ (make note of the folder name, as you might need to change it)

Configure:
Configure the module at admin/config/development/lazyloadxt

Enable static caching for file entities. Written by Fabian Franz.

This module helps clear specific Boost cache pages (delete particular static boost cache pages) on Drupal events - Node create, Node edit/update, Node delete, Node comment create, Node comment edit/update and Node comment delete.

See https://www.drupal.org/project/big_pipe.

This module makes it easy to visualize the impact BigPipe can have for a site. Because it's just a module that provides two blocks, it's very easy/unobtrusive to install on your site, to see what the impact would be of using BigPipe for your site.

Normally on a cron run, all cron tasks will be execute. This is not always necessary, because some of your cron tasks must i.e. only run once at day.

Our module is slim and wil remain so in future, "small but nice".

With this lightweight and simple module you can change the time of execution of each cron task. We recommend to run the main cron (URL) all 5min.

Page Cache Clear was built as a simple way to flush a page's cache when working with Varnish and Workbench moderation.
Uses Rules integration to fire the action and adds a 'Ban' to Varnish.

This module was originally developed to allow for cache clearing with Workbench moderation states, however it will work with other Rules conditions.

Provides integration with bLazy to lazy load and multi-serve images to save bandwidth and server requests. The user will have faster load times and save data usage if they don't browse the whole page.
A friend of mobile devices. Do not let images, especially iframes, kill mobile device traffics.

Complete Drupal Varnish Cache 3.x/4.x integration.

Ported from my Wordpress plugin https://wordpress.org/plugins/vcaching/

This plugin handles all integration with Varnish Cache. It was designed for high traffic websites.

Using the hooks provided by Imageinfo Cache and AdvAgg, this module allows you to copy image/css/js files to another file store like S3.