If you're new to GridPane, our server caching options may be a little confusing at first, especially if it's your first time venturing outside of the more traditional caching plugins such as WP Rocket, Swift Performance, W3TC etc etc.
Some of these perform admirably well - especially Rocket and Swift - but they simply can't perform as well as what our native server caching can offer.
Page Caching and Object Caching
GridPane offers two types of caching: Page caching (2 options available) and object caching.
Our page caching options will cache your individual page assets. Once a page is loaded it creates a static version of it, which can be loaded much faster the next time someone visits that page.
Object caching caches database queries (including things like menu items, breadcrumbs, post author names, dynamically generated archives like blog roll pages etc), which means the database doesn't need to perform the same queries over each time the page is loaded.
GridPane Page Caching Options
GridPane servers run Nginx, and FastCGI is built right in. No plugin based solution will ever match the performance of Nginx server based static asset and page caching, and even if PHP fails your site will still be served from the cached resources until they expire. It performs incredibly well under high loads and is great for websites that don't change often.
Redis Nginx Page Caching
Not to be confused with the Redis Object cache, Redis Nginx page caching is another highly performant page caching solution that plays a little better with more dynamic websites. Most of the websites on GridPane use this option.
For more information on which may be a better choice for your needs, please check out the links at the bottom of this article in the "Getting Started with GridPane Server Caching" section.
Redis Object Caching
Redis is an open source, in-memory data structure store. For WordPress purposes, it can be used alongside a MySQL database to cache your database queries, and dramatically reduce the number of requests that reach your database, thereby decreasing the amount of work your server needs to do in order to serve up your websites pages.
When a visitor hits a page on your website that hasn't been cached, MySQL will serve up the information needed, and this will then be cached by Redis so these same queries don't need to go through MySQL the next time around. When the next visitor comes along, Redis will instead serve the information instead of MySQL.
Reducing the amount of work your server has to do means your website/s will load faster and be able to handle more traffic.
Clearing the Server Caches
We often have people report that the cache clearing doesn't work correctly, but this is usually traced back to one of the above two caches being cleared, and the other one left. If you're trying to fully purge the cache on your website you must clear both the Page Cache using the Nginx Helper plugin, and the object cache using the GridPane Object Cache plugin.
You can also do this in one go inside of your GridPane account using the Self Help tools as shown in the image below:
Getting Started with GridPane Server Caching
The following articles will help you get started using our server caching options. If you're unsure where to start, we recommend checking out this article on caching strategy first:
And you can learn how to set up our different caching options here: