What is Caching?
Excessive load times can harm your website in more ways than one way. There are quite a few ways to improve your site’s speed but caching has the greatest impact on your site.
Data of a web page is cached in order to reduce load times of website. Whenever you return back to a frequently accessed website, its higher chances that your browser will have a good portion of the site page files are stored within its cache. That means the browser needs to receive less ‘fresh’ information from the site, resulting in a faster load time of that website.
As Cache Plugins work by saving the dynamically generated HTML files and serving them from the cache (i.e. reusing previously generated data) whenever a request is made, rather than loading all of the PHP scripts from WordPress every time you hit refresh.
But even if you use such cache plugins, using internal caching methods for objects and database results is a good development practice, so that your plugin doesn’t depend on which cache plugins the end user has. Your plugin needs to be fast on its own, not depending on other plugins to do the dirty work. And if you think you need to write your own cache handling code, you are wrong. WordPress comes with everything you need to quickly implement varying degrees of data caching. Just identify the parts of your code to benefit from optimization, and choose a type of caching.
WordPress implements two different caching methods: Non-persistent and Persistent.
In Non-Persistent caching the data remains in the cache during the loading of the page. WordPress uses this to cache most database query results.
Persistent Caching depends on the database to work, and cached data can auto-expire after some time. WordPress uses this to cache RSS feeds, update checks, etc.
Non-Persistent Cache Link
When you use PHP WordPress functions such as get_posts() or get_post_meta(), WordPress first checks to see whether the data you require is cached. If it is, then you will get data from the cache; if not, then a database query is run to get the data. Once the data is retrieved, it is also cached. A non-persistent cache is recommended for database results that might be reused during the creation of a page.
The code for WordPress’ internal non-persistent cache is located in the cache.php file in the wp-includes directory, and it is handled by the WP_Object_Cache class.
We need to use two basic functions: wp_cache_set() and wp_cache_get(), along with the additional functions wp_cache_add(), wp_cache_replace(), wp_cache_flush() and wp_cache_delete().
Cached storage is organized into groups, and each entry needs its own unique key. To avoid mixing with WordPress’ default data, using your own unique group names is best.
How to Choose Best Cache Plugin for Your WordPress Website
The first step is to identify that what is your requirement from your caching plugin and create criteria accordingly. Criteria could include: Cost, Complexity and intuitiveness, Power and functionality & Support.
Some plugins come with extra features such as integration with content delivery networks and minification means removing all unnecessary characters from source code. These all features enable your site to run even faster but are really only necessary for large sites.
Here are list of WordPress Best Cache Plugin as Below:
WP Super Cache
WP Super Cache is among the fast caching engine for WordPress that produces static html files.
WP Super Cache plugin generates static html files from your dynamic WordPress blog. After a html file is generated your web server will serve that file instead of processing the comparatively heavier and more expensive WordPress PHP scripts.
The static html files will be served to the vast majority of your users, but because a user’s details are displayed in the comment form after they leave a comment those requests are handled by the legacy caching engine. Static files are served to:
- Users who are not logged in.
- Users who have not left a comment on your blog.
- Or users who have not viewed a password protected post.
Most of your visitors will be served static html files. Those users who don’t see the static files will still benefit because they will see different cached files that aren’t quite as efficient but still better than not cached. This plugin will help your server cope with a front page appearance on digg.com or other social networking site.
Garbage collection is the act of cleaning up cache files that are out of date and stale. There’s no correct value for the expiry time but a good starting point is 1800 seconds if you’re not using legacy mode. If you are using that mode start with an expiry time of 600 seconds.
Recommended Settings for WP Super Cache
Advanced users will use mod_rewrite caching, but PHP caching is almost as good and recommended for everyone else.
To get benefited from WP Super Cache enable the following:
- PHP caching
- Compress pages
- Don’t cache pages for known users.
- Cache rebuild.
- CDN support.
- Extra homepage checks.
W3 Total Cache
W3 Total Cache improves the user experience of your site by increasing website performance, reducing download times via features like content delivery network (CDN) integration in your WordPress site.
The only WordPress Performance Optimization (WPO) framework is designed to improve user experience and Search Engine Optimization (SEO) and recommended by countless web hosts.
W3 Total Cache plugin is trusted by numerous companies like: AT&T, stevesouders.com, mattcutts.com, mashable.com, smashingmagazine.com, makeuseof.com, kiss925.com, pearsonified.com, lockergnome.com, johnchow.com, ilovetypography.com, webdesignerdepot.com, css-tricks.com and tens of thousands of others.
BENEFITS of Using W3 Total Cache
- W3 Total Cache improves search engine result page rankings, and more effectively for mobile-friendly websites and sites that use SSL.
- User can feel at least 10x fold improvement in overall site performance when fully configured.
- Improved conversion rates and “site performance” which affect your site’s rank on Google.com
“Instant” repeat page views: browser caching
- Optimized progressive render: pages start rendering quickly and can be interacted with more quickly
- Reduced page load time: increased visitor time on site; visitors view more pages
- Improved web server performance; sustain high traffic periods
- Comparability 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
- Accelerated Mobile Pages (AMP) support
- Secure Socket Layer (SSL) support
- Caching of (minified and compressed) pages and posts in memory or on disk or on (FSD) CDN (by user agent group)
- Caching of feeds (site, categories, tags, comments, search results) in memory or on disk or on CDN
- 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
- Caching of fragments in memory or on disk
- Minification of posts and pages and feeds
- 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”
- Import post attachments directly into the Media Library (and CDN)
- WP-CLI support for cache purging, query string updating and more
- Various security features
- Caching statistics for performance insights
- Extension framework for customization or extensibility e.g. New Relic, Cloudflare, WPML and more
- Reverse proxy integration via Nginx or Varnish
WP Fastest Cache
WP Fastest Cache plugin creates static html files from your dynamic WordPress blog. When a page is rendered, php and mysql are used. Therefore, system needs RAM and CPU. If many visitors come to a site, system uses lots of RAM and CPU so page is rendered so slowly. In this case, you need a cache system not to render page again and again. Cache system generates a static html file and saves. Other users reach to static html page
Features of WP Fastest Cache
- Mod_Rewrite which is the fastest method is used in this plugin
- All cache files are deleted when a post or page is published
- Admin can delete all cached files from the options page
- Admin can delete minified css and js files from the options page
- Block cache for specific page or post with Short Code
- Cache Timeout – All cached files are deleted at the determinate time
- Cache Timeout for specific pages
- Enable/Disable cache option for mobile devices
- Enable/Disable cache option for logged-in users
- SSL support
- CDN support
- Preload Cache – Create the cache of all the site automatically
- Exclude pages and user-agents
- Performance Optimization
- Generating static html files from your dynamic WordPress blog
- Minify Html – You can decrease the size of page
- Minify Css – You can decrease the size of css files
- Enable Gzip Compression – Reduce the size of files sent from your server to increase the speed to which they are transferred to the browser.
- Leverage browser caching – Reduce page load times for repeat visitors
- Combine CSS – Reduce number of HTTP round-trips by combining multiple CSS resources into one
Hyper Cache is a cache plugin specifically written to get the maximum speed for your WordPress blog. It can be used in low resources hosting as well on high end servers.
Hyper Cache is purely PHP and works on every blog: no complex configurations are needed and when you deactivate it no stale settings are left around.
Hyper Cache features:
- Mobile aware: double cache for desktop and mobile site versions
- HTTPS ready
- Mobile theme switch option: change the theme on mobile device detection
- Able to serve expired pages to bots to increase the perceived blog speed by bots
- Manages compression even on the fly for non cached pages
- Lots of configurable bypasses: matching cookies, matching urls, user agents
- Comments aware: is able to serve cached pages even to visitors who commented the blog (perfect for blog with great readers paritipation)
- Cache folder can be moved outside your blog space to exclude it from backups
- Controls over cache cleaning on blog events (post edited, comments, …)
- Autoclean to controls the cache used disk space
- CDN support
- Other special options
- Response header signature to check the working status
- bbPress specific integration
Simple Cache was constructed after getting frustrated with the major caching plugins available and building sites with developer-only complex caching solutions that get millions of page views per day.
Simple Cache features:
- Extremely simple one-click install. There is an on-off switch. That’s it. No need to wade through 50 complicated settings.
- Simple Cache makes your site run very fast so you can handle lots of traffic.
- Extremely easy to delete. Don’t like the plugin? You can remove it, and your website won’t break.
- Easily clear the cache if you need to.
- Want to get advanced with object caching. An advanced mode is available that will automatically setup Batcache and Memcached/Redis for you.
WP Rocket is one of the best caching solutions for WordPress and the only premium plugin on our list. It is tremendously user-friendly and a lifesaver for webmasters who find technical terms and web programming to be perplexing.
The plugin will function correctly after activation; as a result you won’t be racking your head against the wall trying to configure it. Those of you who are technologically literate can dive into it’s advanced options and set up a custom configuration.
It’s lazy image loading feature sets it apart from the other popular caching solutions. Those of you who don’t already know, this feature makes it so that the images you have set on your page are loaded only when the user scrolls down the page. This non-preemptive approach significantly improves load times.
Here are some other features you’ll find on every license of the caching plugin:
- Simple, fast, and intuitive setup
- Page caching is immediately activated
- Google Fonts Optimization minimizes HTTP requests
- Integrates seamlessly with CloudFlare
There is many more WordPress Cache plugin, and Selecting a Cache Plugin completely dependent on your website requirement.