Performance and Scalability

If your talking about very very very fast file transfer then here is the destiny.

Why xsend module is made for?

xsend is a simple module to help you to speed up your private file transfers. Normally Drupal private file transfer is quite troublesome and not secure if the files folder is located at public_html. This module will also help protect your files from unauthorized access.

Entity cache puts core entities into Drupal's cache API.

Due to the entity loading changes in Drupal 7, no core patches are required.

Backport of Drupal 7 Queue API.

Note: if you use Drupal Queue, make sure to configure Drupal cron and Drupal Queue's own cron entry point. See README.txt for details.

Drupal Queue Drupal 7 issues

• #391340 Job Queue API
• #578676 Use queue for cron

Based on an initial patch to Drupal 7 core by chx, dww, neclimdul et. al.

This module provides configurable actions upon events that will expire URLs from caches like reverse proxy caches, internal page caches, etc.This module make more sense when Minimum Cache Lifetime setting is set to a value other than none.

There is now integration with the following modules:

This module aims to utilize Google Closure Compiler API/application to optimize your cached JavaScript files.

More info about the application/service:
http://code.google.com/closure/compiler/

Closure Compiler module looks at the cached JavaScript folder (sites/default/files/js) and processes files on cron run. It basically supports 3 different modes:

MongoDB integration for Drupal. This is a collection of several modules which allow sites to store different types of Drupal data in MongoDB.

Cache plugins for Panels module. Currently implemented node based cache plugin. Node based cache is intended for panels/panes which update together with nodes they contain.
Advantages:

• Instant updates. Users don't see old content.
• Granular updates: only panes/panels containing changed nodes are flushed. Highest cache efficiency.
• Works for registered users too and complements anonymous page caching

Supported cache backends: Memcached (both Memcache API and Cacherouter-Memcache should work). Other cache backends are not supported because of the way Namespice module works.

This module is not recommended for production use yet: because of undecided status of Namespice module, Advanced Panels Cache remains experimental too.

Namespace for cache. Namespice implements simple API containing wrapper functions for cache management using concept of tags.
Supported cache backend: Memcached (both Memcache API and Cacherouter-Memcache should work).
This is an API module for developers, it doesn't have any usage on it's own. Install it only when required by other module.

State of this module

Namespice is experimental. It's features and ideas will likely be incorporated into some cache backend project, to fully support cache lifetime, stampede protection etc.

Features

• Tagging of cache entries.
• Optimized serial storage
• Atomic serial operations. Multiple thread friendly

A middleware client. This module is a client for middleware server module.

Middleware is used to establish XML-RPC based nearly realtime data exchange among any number of Drupal sites and external systems. Data can be replicated in many directions using different routes with different rules applied. Creations, updates and removals are separated. Pluggable connectors take care of system-specific implementations.

Already implemented features:

Provides the ability to load the contents of a field via Ajax.