W3 Total Cache NG

=== Plugin Name === Contributors: fredericktownes, tperalta82 Tags: w3totalcache, w3 totalcache, w3total cache, wpo, web performance optimization, performance, availability, scaling, scalability, user experience, cache, caching, page cache, css cache, js cache, db cache, disk cache, disk caching, database cache, http compression, gzip, deflate, minify, cdn, content delivery network, media library, performance, speed, multiple hosts, css, merge, combine, unobtrusive javascript, compress, optimize, optimizer, javascript, js, cascading style sheet, plugin, yslow, yui, google, google rank, google page speed, mod_pagespeed, new relic, newrelic, aws, s3, cloudfront, sns, elasticache, rds, flash media server, amazon web services, cloud files, rackspace, akamai, max cdn, limelight, cloudflare, mod_cloudflare, microsoft, microsoft azure, iis, nginx, litespeed, apache, varnish, xcache, apc, eacclerator, wincache, mysql, w3 total cache, batcache, wp cache, wp super cache, quick cache, wp minify, bwp-minify, buddypress Requires at least: 3.2 Tested up to: 4.4.2 Stable tag: 0.9.4.1-ng License: GPLv2 or later License URI: http://www.gnu.org/licenses/gpl-2.0.html

This fork comes without any warranty, if it messes up your WP, blame my mother for having me. If you install both this fork and the original version, there will be dragons , do not do it.

Easy Web Performance Optimization (WPO) using caching: browser, page, object, database, minify and content delivery network support.

== Description == This fork comes with the following extras:

PHP7 Support Memcached Support Redis Support

The only WordPress Performance Optimization (WPO) framework; designed to improve user experience and page speed.

Recommended by web hosts like: Page.ly, Synthesis, DreamHost, MediaTemple, Go Daddy, Host Gator and countless more.

Trusted by countless companies like: AT&T, stevesouders.com, mattcutts.com, mashable.com, smashingmagazine.com, makeuseof.com, yoast.com, kiss925.com, pearsonified.com, lockergnome.com, johnchow.com, ilovetypography.com, webdesignerdepot.com, css-tricks.com and tens of thousands of others.

W3 Total Cache improves the user experience of your site by increasing server performance, reducing the download times and providing transparent content delivery network (CDN) integration.

An inside look:

http://www.youtube.com/watch?v=rkmrQP8S5KY

Benefits:

• At least 10x improvement in overall site performance (Grade A in YSlow or significant Google Page Speed improvements) when fully configured
• Improved conversion rates and "site performance" which affect your site's rank on Google.com
• "Instant" subsequent page views: browser caching
• Optimized progressive render: pages start rendering quickly
• Reduced page load time: increased visitor time on site; visitors view more pages
• Improved web server performance; sustain high traffic periods
• Up to 80% bandwidth savings via minify and HTTP compression of HTML, CSS, JavaScript and feeds

Features:

• Compatible with shared hosting, virtual private / dedicated servers and dedicated servers / clusters
• Transparent content delivery network (CDN) management with Media Library, theme files and WordPress itself
• Mobile support: respective caching of pages by referrer or groups of user agents including theme switching for groups of referrers or user agents
• Caching of (minified and compressed) pages and posts in memory or on disk or on CDN (mirror only)
• Caching of (minified and compressed) CSS and JavaScript in memory, on disk or on CDN
• Caching of feeds (site, categories, tags, comments, search results) in memory or on disk or on CDN (mirror only)
• Caching of search results pages (i.e. URIs with query string variables) in memory or on disk
• Caching of database objects in memory or on disk
• Caching of objects in memory or on disk
• Minification of posts and pages and feeds
• Minification of inline, embedded or 3rd party JavaScript (with automated updates)
• Minification of inline, embedded or 3rd party CSS (with automated updates)
• Browser caching using cache-control, future expire headers and entity tags (ETag) with "cache-busting"
• JavaScript grouping by template (home page, post page etc) with embed location control
• Non-blocking JavaScript embedding
• Import post attachments directly into the Media Library (and CDN)
• WP-CLI support for cache purging, query string updating and more

Improve the user experience for your readers without having to change WordPress, your theme, your plugins or how you produce your content.

== Frequently Asked Questions ==

= Why does speed matter? =

Speed is among the most significant success factors web sites face. In fact, your site's speed directly affects your income (revenue) — it's a fact. Some high traffic sites conducted research and uncovered the following:

• Google.com: +500 ms (speed decrease) -> -20% traffic loss [1]
• Yahoo.com: +400 ms (speed decrease) -> -5-9% full-page traffic loss (visitor left before the page finished loading) [2]
• Amazon.com: +100 ms (speed decrease) -> -1% sales loss [1]

A thousandth of a second is not a long time, yet the impact is quite significant. Even if you're not a large company (or just hope to become one), a loss is still a loss. However, there is a solution to this problem, take advantage.

Search engines like Google, measure and factor in the speed of web sites in their ranking algorithm. When they recommend a site they want to make sure users find what they're looking for quickly. So in effect you and Google should have the same objective.

Many of the other consequences of poor performance were discovered more than a decade ago:

• Lower perceived credibility (Fogg et al. 2001)
• Lower perceived quality (Bouch, Kuchinsky, and Bhatti 2000)
• Increased user frustration (Ceaparu et al. 2004)
• Increased blood pressure (Scheirer et al. 2002)
• Reduced flow rates (Novak, Hoffman, and Yung 200)
• Reduced conversion rates (Akamai 2007)
• Increased exit rates (Nielsen 2000)
• Are perceived as less interesting (Ramsay, Barbesi, and Preece 1998)
• Are perceived as less attractive (Skadberg and Kimmel 2004)

There are a number of resources that have been documenting the role of performance in success on the web, W3 Total Cache exists to give you a framework to tune your application or site without having to do years of research.

= Why is W3 Total Cache better than other cache plugins? =

It's a complete framework. Most cache plugins available do a great job at achieving a couple of performance aims. Our plugin remedies numerous performance reducing aspects of any web site going far beyond merely reducing CPU usage (load) and bandwidth consumption for HTML pages alone. Equally important, the plugin requires no theme modifications, modifications to your .htaccess (mod_rewrite rules) or programming compromises to get started. Most importantly, it's the only plugin designed to optimize all practical hosting environments small or large. The options are many and setup is easy.

= I've never heard of any of this stuff; my site is fine, no one complains about the speed. Why should I install this? =

Rarely do readers take the time to complain. They typically just stop browsing earlier than you'd prefer and may not return altogether. This is the only plugin specifically designed to make sure that all aspects of your site are as fast as possible. Google is placing more emphasis on the speed of a site as a factor in rankings; this plugin helps with that too.

It's in every web site owner's best interest is to make sure that the performance of your site is not hindering its success.

= Which WordPress versions are supported? =

To use all features in the suite, a minimum of version WordPress 2.8 with PHP 5 is required. Earlier versions will benefit from our Media Library Importer to get them back on the upgrade path and into a CDN of their choosing.

= Why doesn't minify work for me? =

Great question. W3 Total Cache uses several open source tools to attempt to combine and optimize CSS, JavaScript and HTML etc. Unfortunately some trial and error is required on the part of developers is required to make sure that their code can be successfully minified with the various libraries W3 Total Cache supports. Even still, if developers do test their code thoroughly, they cannot be sure that interoperability with other code your site may have. This fault does not lie with any single party here, because there are thousands of plugins and theme combinations that a given site can have, there are millions of possible combinations of CSS, JavaScript etc.

A good rule of thumb is to try auto mode, work with a developer to identify the code that is not compatible and start with combine only mode (the safest optimization) and increase the optimization to the point just before functionality (JavaScript) or user interface / layout (CSS) breaks in your site.

We're always working to make this more simple and straight forward in future releases, but this is not an undertaking we can realize on our own. When you find a plugin, theme or file that is not compatible with minification reach out to the developer and ask them either to provide a minified version with their distribution or otherwise make sure their code is minification-friendly.

= Who do you recommend as a CDN (Content Delivery Network) provider? =

That depends on how you use your site and where most of your readers read your site (regionally). Here's a short list:

• MaxCDN, Discount Coupon Code
• EdgeCast / MediaTemple ProCDN
• Amazon Cloudfront
• Rackspace Cloud Files
• Limelight Networks
• Akamai

= What about comments? Does the plugin slow down the rate at which comments appear? =

On the contrary, as with any other action a user can perform on a site, faster performance will encourage more of it. The cache is so quickly rebuilt in memory that it's no trouble to show visitors the most current version of a post that's experiencing Digg, Slashdot, Drudge Report, Yahoo Buzz or Twitter effect.

= Will the plugin interfere with other plugins or widgets? =

No, on the contrary if you use the minify settings you will improve their performance by several times.

= Does this plugin work with WordPress in network mode? =

Indeed it does.

= Does this plugin work with BuddyPress (bbPress)? =

Yes.

= Will this plugin speed up WP Admin? =

Yes, indirectly - if you have a lot of bloggers working with you, you will find that it feels like you have a server dedicated only to WP Admin once this plugin is enabled; the result, increased productivity.

= Which web servers do you support? =

We are aware of no incompatibilities with apache 1.3+, IIS 5+ or litespeed 4.0.2+. If there's a web server you feel we should be actively testing (e.g. lighttpd), we're interested in hearing.

= Is this plugin server cluster and load balancer friendly? =

Yes, built from the ground up with scale and current hosting paradigms in mind.

= What is the purpose of the "Media Library Import" tool and how do I use it? =

The media library import tool is for old or "messy" WordPress installations that have attachments (images etc in posts or pages) scattered about the web server or "hot linked" to 3rd party sites instead of properly using the media library.

The tool will scan your posts and pages for the cases above and copy them to your media library, update your posts to use the link addresses and produce a .htaccess file containing the list of of permanent redirects, so search engines can find the files in their new location.

You should backup your database before performing this operation.

= How do I find the JS and CSS to optimize (minify) them with this plugin? =

Use the "Help" button available on the Minify settings tab. Once open, the tool will look for and populate the CSS and JS files used in each template of the site for the active theme. To then add a file to the minify settings, click the checkbox next to that file. The embed location of JS files can also be specified to improve page render performance. Minify settings for all installed themes can be managed from the tool as well by selecting the theme from the drop down menu. Once done configuring minify settings, click the apply and close button, then save settings in the Minify settings tab.

= I don't understand what a CDN has to do with caching, that's completely different, no? =

Technically no, a CDN is a high performance cache that stores static assets (your theme files, media library etc) in various locations throughout the world in order to provide low latency access to them by readers in those regions.

= What if I don't want to work with a CDN right now, is there any other use for this feature? =

Yes! You can take advantage of the pipelining support in