Performance and Scalability

AppInsight provides tools to actively monitor your Drupal websites and notify you of performance and security vulnerabilities.

CloudFlare is a FREE reverse proxy, firewall, and global content delivery network and can be implemented without installing any server software or hardware.

On average, CloudFlare-powered websites load 30% faster, use 60% less bandwidth, and process 65% fewer requests. CloudFlare-powered websites are protected from many forms of malicious activity including: comment spam, email harvesting, SQL injection, cross-site scripting, and DDoS (denial of service) attacks.

A node I found describes how to do it manually, this is a minimalistic module that adds a button to the admin interface.

Dependencies

• Progress (D7 only)

Modules that utilize Background Process

• Cache Graceful

OVERVIEW

• IaaS is a subsidiary modules which co-work with Cloud.

OVERVIEW

Clanavi 「クラナビ」 (Cloud module) is a project name of Drupal-based Cloud Dashboard like Amazon Management Console, ElasticFox, etc. The module is not only support public cloud like Amazon EC2 but also private cloud like OpenStack and XCP (Xen Cloud Platform) because the system is highly modularized by Drupal architecture.

A very simple module that allows certain users (based on role) to clear the site caches without requiring access to the full set of Site Configuration and Performance settings.

http://drupal.org/node/1078060
http://drupal.org/project/css_emimage
I need a sandbox to make commits & patching easier for the integration of advagg

UPDATE: Looking at Cache Backport, this module seems somewhat ridiculous ... I have now abandoned it.

Provides multiple caching backends framework. Use any drupal 6 cache.inc file for a given cache table.

This module works by generating php source-code in order to separate cache_get(), and so on, into different "namespaces" by prefixing the function names.

As this module auto-generates code, it might not be considered production-grade. Use with caution.

The following example uses the memcache backend for all cache tables except cache_form:

INTRODUCTION

The Cache Heuristic module gathers information on which cache entries are used
on a page, and bulk-loads these cache entries on following requests.