PUBLIC MARKS from holyver with tags cache & performance

APC (Alternative PHP Cache) is a PHP opcode cache. It stores PHP pages in RAM and reduces hard disk activity. This makes a real difference to the performance in Moodle, and you should be able to achieve a 50% increase in system capacity and your CPU will be 50% less busy. This guide is for installation of APC on a Windows server. The instructions have been tested on a Windows 2003 server, and they should also be applicable if you are using Windows XP as a test server.

Obtaining Optimal Performance From Drupal And The LAMP Stack

Improving Drupal's Performance with the Boost Module for the UN's Millennium Campaign. How the Boost Module Helped a Very High Traffic Drupal Site Stay Online

A Web cache sits between one or more Web servers (also known as origin servers) and a client or many clients, and watches requests come by, saving copies of the responses — like HTML pages, images and files (collectively known as representations) — for itself. Then, if there is another request for the same URL, it can use the response that it has, instead of asking the origin server for it again.

Caching is a great example of the ubiquitous time-space tradeoff in programming. You can save time by using space to store results. In the case of websites, the browser can save a copy of images, stylesheets, javascript or the entire page. The next time the user needs that resource (such as a script or logo that appears on every page), the browser doesn’t have to download it again. Fewer downloads means a faster, happier site.

Vey useful links for cache control and browser behaviors * Explain of cache control in detail (very nice article! ) http://betterexplained.com/articles/how-to-optimize-your-site-with-http-caching/ * The State of Browser Caching: http://www.mnot.net/blog/2006/05/11/browser_caching * XMLHttpRequest caching: http://www.mnot.net/javascript/xmlhttprequest/cache.html