Performance Optimization Modules

What about these 2 wiki's?
http://groups.drupal.org/node/21897
http://groups.drupal.org/node/57563
Either way we should have one source.

I thought I'd create a Wiki listing of all modules that can help beginners and intermediary drupal users (like myself) to optimise their websites' pageloads. Please enter the modules that you are familiar with, and few words of description/review/rating would also be helpful.

CDN integration -- Offers the ability to serve static files via a Content Delivery Network. As mentioned within the project page it does not seem to be ready for production use.

Boost -- Provides static page caching, enabling a potentially very significant performance and scalability boost for heavily-trafficked Drupal sites. Often useful for sites on shared hosting, which don't have many other configuration options.

Cacherouter -- provides a way to use different cache backends for Drupal 6. Slightly controversial, not needed for D7. Any reviews?

Javascript Aggregator -- This module aggregates all your .js scripts, reducing the number of necesserary downloads. It can also delete any unuseful characters (commentaries, unuseful blank spaces...). It provides the possibility to exclude some scripts, because some of them may cause problems (test it before enablig on production). In fact, this is the same functionnality than what already exists in core for CSS.

CSS sprite generation -- (not avail for D6) see http://groups.drupal.org/node/15399

Advanced Cache -- (not avail for D6) Brings caching in Drupal to places where it is historically unavailable.

Memcache API and Integration -- An API for using Memcached and the PECL Memcache library with Drupal.

Block Cache -- a module that creates a cached version of each block.

Elysia Cron -- if cron jobs are a serverload problem, this module separates them by module so they can all be run at different times. Highly recommended.

DB Tuner -- drupal port of https://launchpad.net/mysqltuner

Querycache -- caches common SQL queries

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CDN:

• http://drupal.org/project/cdn

• http://drupal.org/project/cloudfront

• http://drupal.org/project/parallel

• http://drupal.org/project/simplecdn

• http://drupal.org/project/creeper ?

• http://drupal.org/project/sf_cache

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CSS:

• http://drupal.org/project/css_gzip

• http://drupal.org/project/csstidy

• http://drupal.org/project/css_emimage

• http://drupal.org/project/css_preprocessor

• CSS Sprite generation: http://groups.drupal.org/node/15399

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Images:

• http://drupal.org/project/xsend

• http://drupal.org/project/image_optimize

• http://drupal.org/project/imageapi_optimize

• http://drupal.org/project/imagecache_smushit

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JavaScript:

• http://drupal.org/project/ajaxcache

• http://drupal.org/project/closure_compiler

Any other modules that you know of?

Adding best articles, handbook pages, tweaks, would also be helpful

Please add the modules that you've tried and put the ones you recommend most at the top.