**NOTICE: This plugin is no longer maintained.** Quick Cache has been renamed to ZenCache.
To understand how Quick Cache works, first you have to understand what a cached file is, and why it is absolutely necessary for your site and every visitor that comes to it. WordPress® (by its very definition) is a database-driven publishing platform. That means you have all these great tools on the back-end of your site to work with, but it also means that every time a Post/Page/Category is accessed on your site, dozens of connections to the database have to be made, and literally thousands of PHP routines run in harmony behind-the-scenes to make everything jive. The problem is, for every request that a browser sends to your site, all of these routines and connections have to be made (yes, every single time). Geesh, what a waste of processing power, memory, and other system resources. After all, most of the content on your site remains the same for at least a few minutes at a time. If you've been using WordPress® for very long, you've probably noticed that (on average) your site does not load up as fast as other sites on the web. Now you know why!
In computer science, a cache (pronounced /kash/) is a collection of data duplicating original values stored elsewhere or computed earlier, where the original data is expensive to fetch (owing to longer access time) or to compute, compared to the cost of reading the cache. In other words, a cache is a temporary storage area where frequently accessed data can be stored for rapid access. Once the data is stored in the cache, it can be used in the future by accessing the cached copy rather than re-fetching or recomputing the original data.
Quick Cache is extremely reliable, because it runs completely in PHP code, and does not hand important decisions off to the
mod_rewrite engine or browser cache; also making Quick Cache MUCH easier to setup and configure.
In addition, Quick Cache actually sends a no-cache header (yes, a no-cache header); which allows it to remain in control at all times. It might seem weird that a caching plugin would send a no-cache header :-). Well, no-cache headers are a key component in this plugin, and they will NOT affect performance negatively. On the contrary, this is how the system can accurately serve cache files to public users vs. users who are logged-in, commenters, etc.
If you care about the speed of your site, Quick Cache is one of those plugins that you absolutely MUST have installed :-) Quick Cache takes a real-time snapshot (building a cache) of every Page, Post, Category, Link, etc. These snapshots are then stored (cached) intuitively, so they can be referenced later, in order to save all of that processing time that has been dragging your site down and costing you money.
The Quick Cache plugin uses configuration options that you select from the options panel. See: Quick Cache -› Options in your Dashboard. Once a file has been cached, Quick Cache uses advanced techniques that allow it to recognize when it should and should not serve a cached version of the file. By default, Quick Cache does not serve cached pages to users who are logged in, or to users who have left comments recently. Quick Cache also excludes administrative pages, login pages, POST/PUT/DELETE/GET(w/ query string) requests and/or CLI processes.
WordPress® Multisite Networking is a special consideration in WordPress®. If Quick Cache is installed under a Multisite Network installation, it will be enabled for ALL blogs the same way. The centralized config options for Quick Cache, can only be modified by a Super Administrator operating on the main site. Quick Cache has internal processing routines that prevent configuration changes, including menu displays; for anyone other than a Super Administrator operating on the main site.
You don't have to use an
.htaccess file to enjoy the performance enhancements provided by this plugin; caching is handled by WordPress®/PHP alone. That being said, if you want to take advantage of GZIP compression (and we do recommend this), then you WILL need an
.htaccess file to accomplish that part. This plugin fully supports GZIP compression on its output. However, it does not handle GZIP compression directly. We purposely left GZIP compression out of this plugin, because GZIP compression is something that should really be enabled at the Apache level or inside your
If you want to enable GZIP, create an
.htaccess file in your WordPress® installation directory and put the following few lines in it. Alternatively, if you already have an
.htaccess file, just add these lines to it, and that is all there is to it. GZIP is now enabled!
If your installation of Apache does not have
mod_deflate installed. You can also enable GZIP compression using PHP configuration alone. In your
php.ini file, you can simply add the following line anywhere:
zlib.output_compression = on
Ordinarily you can just deactivate Quick Cache from the plugins menu in WordPress. However, if you're having a more serious issue, please follow the instructions here.
Quick Cache is now completely uninstalled and you can start fresh :-)
TIP: you can preview Pro features in the free version by clicking the "Preview Pro Features" link at the top of your Quick Cache options.
Quick Cache Pro is a wholly contained plugin that does not require Quick Cache Lite to be installed. To install Quick Cache Pro,
Requires: 3.7 or higher
Compatible up to: 4.1.3
Last Updated: 2015-3-15
Active Installs: 100,000+
2 of 3 support threads in the last two months have been resolved.
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