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Wordpress Caching: How It Works

WordPress Caching: How It Works

The issue of website load time has been and will still continue for a while. A simple solution is website caching and this article will show you how it works. Your website needs to load within 3 seconds. Why? A website that loads faster will be generally accepted by users – great user experience. Cache in computers means a temporary virtual location that provides information to users as soon as it is needed, hence it saves the device the issue of run time or load time. Caching in WordPress is the process whereby a static page – say the homepage, is created when a user first visits your website and then it is loaded first to the user before the website completely finish loading when next the same user visits your website. It serves the static page first. Furthermore, from the above definitions, you can see that the importance of WordPress caching cannot be overemphasized. WordPress caching is done by a plugin. When your website takes more than 3secs to load chances are that the visitor would close it and not come back. To do this efficiently, you need to know your website’s speed. How long does it take to load a single page of your website?  Tools like Ysolo will help you do this.

There are two ways in which caching works;  Client-Side Caching, and Server-Side Caching.

A) Client – Side Caching. Every website you visit has a JavaScript, CSS file, images text, links, etc all tied to the HTML document. Once a visitor lands on a page on the website, the content is stored on the hard drive as a cache file. If the visitor comes in a second time to the same page, the browser simply loads or serves the cache file as a static web page for the user.

B) Server – Side Caching. There are four types in this category. They are;

  • Page caching
  • Object-based caching
  • Database caching
  • Opcode caching 

Page Caching

This is the same thing as the client-side caching. It bypasses the rigors of loading PHP and MySQL files and just loads the HTML document from the cache file in the computer memory.

Object-Based Caching

This has to do with caching APIs, transient API and object cache. It is done by a caching plugin and simply just neglects calls to the database. It’s a little bit complex. But it can be done by a professional. Also, it is not an everyday thing for WordPress users.

Database Caching

Every time you update your blog or website, the database is updated and the PHP file sees the need to update the client once it is requested. The caching is done when the cache file on the computer memory is deleted and replaced with the most recent update, therefore, clearing any chances of erroneous caching, only update information.

Opcode caching

This simply means saving every PHP file as soon as it is compiled after every request. Since PHP is an object-oriented programming language, it needs to be compiled. Take note, every cache file is stored on your device’s memory, and it consumes space on your hard drive. So, deleting these cache files as soon as possible is necessary.

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