LWSCache vs SQLite Object Cache

This plugin, created by LWS help to automatically manage your LWSCache purge when you edit your pages, post, messages… It provide a way to purge all your LWSCache. This plugin works only on servers using the LWSCache system. This cache is pre-installed with Classic shared web hosting, WordPress hosting and soon cPanel hosting from LWS. The loading speed of your site is crucial to its success. The more visitors your site has, the more RAM and CPU memory the system uses. The page is loaded slowly. So you need a cache system to avoid reloading the page when it is not necessary. In addition, the site’s page load speed is used in Google’s ranking algorithm. So caching plugins that can improve load times will improve your SEO ranking. Low rankings, and therefore insufficient exposure, often do not allow you to make a living from your website. The loading time of most websites is less than three seconds. Beyond that, many users have already left the page. The LWS Cache tool is a system designed and developed by LWS. It optimize the loading performance of your website through the use of advanced caching mechanisms, configured at the server level. The tool uses the technologies provided by NGINX. Functioning When LWS Cache is enabled, a cache server is introduced between the visitor and the web server. The aim is to reduce the number of script executions required. For that it keeps the result of the execution in memory for future requests requiring the same response. This means that the same script is no longer executed several times to achieve the same result. Thus, we eliminate the waiting time of the script execution on the page loading time. At the same time, we save the resources used during the script execution. The visitor requests the page from the web server. Example: index.php. LWS Cache checks if the page has already been generated and stored in the cache If yes, the page is returned directly to the visitor without the need to access the web service and without executing the script If not, the page is requested to be generated on the web service as a result of the script execution (PHP, NodeJS, Perl, Ruby, …). Once the page is generated, LWS Cache determines if the page can be cached (via headers, URL, …) If yes, the page is saved in the cache and returned to the visitor If not, the page is saved in the microcache (short-lived cache) and returned to the visitor Managing LWS Cache with the plugin The WordPress LWS Cache plugin allows you to automatically purge the cache of your pages when you modify them or when you add/approve comments. To manage the plugin, once connected to your WordPress administration console, go to the “Settings” menu and then “LWS Cache”. From the settings page, you can enable/disable automatic emptying. You can define when to automatically empty the LWS Cache and completely purge the cache. A button for emptying the entire cache can be found anywhere in the WordPress admin console (in the quick access bar at the top of the screen). Key Features Several settings are available to manage your LWS Cache, you can enable or disable these settings: Automatic purge Home Page Purge (when a post is modified or added, when a published post is trashed) Purge Post/Page/Custom Post Type (when a post is published, when a comment is approved/published, when a comment is unapproved/deleted) Purge Archives (date, category, tag, author, custom taxonomies) Purge all cache

A persistent object cache helps your site perform well. This one uses the widely available SQLite3 extension, and optionally the igbinary and APCu extensions to php. Many hosting services offer those extensions, and they are easy to install on a server you control. What is this about? It’s about making your site’s web server perform better. An object cache does that by reducing the workload on your MariaDB or MySQL database. This is not a page cache; these persistent objects go into a different kind of cache. These objects aren’t chunks of web pages ready for people to view in their browsers, they are data objects for use by the WordPress software. Caches are ubiquitous in computing, and WordPress has its own caching subsystem. Caches contain short-term copies of the results of expensive database lookups or computations, and allow software to use the copy rather than repeating the expensive operation. This plugin (like other object-caching plugins) extends WordPress’s caching subsystem to save those short-term copies from page view to page view. WordPress’s cache happens to be a memoization cache. Without a persistent object cache, every WordPress page view must use your MariaDB or MySQL database server to retrieve everything about your site. When a user requests a page, WordPress starts from scratch and loads everything it needs from your database server. Only then can it deliver content to your user. With a persistent object cache, WordPress immediately loads much of the information it needs. This lightens the load on your database server and delivers content to your users faster. Who should use this? If your site runs on a single web server machine, and that server provides the SQLite3 and igbinary extensions to php, this plugin will almost certainly make your site work faster. And if that server provides the APCu extension, this plugin uses it too. Some hosting providers offer redis cache servers. If your provider offers redis, it may be a good choice. You can use it via the Redis Object Cache plugin. Sites using redis have one SQL database and another non-SQL storage server: redis. Other hosting providers offer memcached, which has the Memcached Object Cache plugin. And some large multipurpose cache plugins, such as the LiteSpeed Cache, also offer object caching based on one of those cache server software packages. The cache-server approach to object caching comes into its own when you have multiple load-balanced web server machines handling your site. SQLite doesn’t work correctly in a multiple-web-server environment. But, for single-server site configurations, SQLite, possibly assisted by APCu, performs well. And the vast majority of sites are single-server. APCu APCu is an in-memory storage medium. It lets php programs, like WordPress, store data in shared memory so it’s very fast to retrieve when needed. If APCu is available on your host server, you can configure this plugin to use it. It reduces the typical cache lookup time to one-fifth or less of the SQLite lookup time, which is itself a few tens of microseconds. Performance counts, especially on busy web sites. Please look at Installation to learn how to configure this plugin to use APCu. The plugin works fast without it, and faster with it. WP-CLI: Even if APCu is in use, caching with SQLite is necessary when your web site uses WP-CLI, because WP-CLI programs do not have access to the APCu cache. This plugin writes all cached data both to APCu and to SQLite and makes sure the two are synchronized. WP-CLI You can control this plugin via WP-CLI once you activate it. Please type this command into your shell for details. wp help sqlite-object-cache Credits Thanks to Till Krüss. His Redis Object Cache plugin serves as a model for this one. And thanks to Ari Stathopoulos and Jonny Harris for reviewing this. Props to Matt Jones for finding and fixing a bug that appeared on a heavily loaded system. Thanks to Massimo Villa for testing help, and to nickchomey for a comprehensive code review. All defects are, of course, entirely the author’s responsibility. And thanks to Jetbrains for the use of their software development tools, especially PhpStorm. It’s hard to imagine how a plugin like this one could be developed without PhpStorm’s tools for exploring epic code bases like WordPress’s. How can I learn more about making my WordPress site more efficient? We offer several plugins to help with your site’s database efficiency. You can read about them here.