All help articlesHow to enable WP_CACHE
Warning
WP_CACHE offers some great additional features for customers who are using a persistent caching plugin on top of Flywheel’s stellar server-level cache. WP_CACHE doesn’t do anything on its own, so it’s best to leave WP_CACHE disabled unless your site has a specific need for it. For users who want to use a caching plugin on top of Flywheel like WP-Rocket, that plugin will need to create something called a persistent cache. This plugin will effectively dictate that the cache should never get rebuilt unless this plugin explicitly tells it to.
Warning
Important note: If you’re using WP Rocket, make sure “Activate Preloading” is turned off (unchecked) in WP Rocket settings. Preloading in WP Rocket will continuously try to purge and refill cache, which results in over-consumption of resources and ironically leads to performance issues.In order to hand over control to the persistent caching plugin, you’ll need to enable a feature called WP_CACHE.
To enable this in the Flywheel app, navigate to the Advanced tab for your site and toggle WP_CACHE so the graphic is green and reads “On”.
Note
A note on Flywheel’s default caching setup:On Flywheel, our caching system helps make your site run blazingly fast while still allowing you to make ongoing updates to your site’s content and appearance that show up in real time. To strike this balance, the kind of caching we employ is non-persistent.
In a non-persistent cache, once all the pieces of a requested page are assembled after being visited and then are converted into a static snapshot. Each cached snapshot resides in our server’s memory for a set duration of time. This means that that short-term visits can simply pull up this ready-made page instead of needing to re-assemble every component of the page from scratch each time.
In this setup, after some time has passed, our system will clear this cache and then rebuild itself when a new visitor loads the page. Thus, we wind up with regularly updated content that loads quickly when you have more than one visitor to a particular page in a short window of time.
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