Knowledge base
Caching, and how to clear it
What the cache layer does, when to clear it, and why your change may not be showing yet.
Most of what a visitor loads never reaches PHP at all — it is served from cache, which is the single biggest reason a site here is fast.
The layers, outermost first
The CDN, if you have one, serves images and static files from near the visitor. The server cache holds whole rendered pages, so a repeat visit does not run PHP. The Zinn® cache plugin on WordPress sites decides what is cacheable and clears the right pages when you publish.
When you need to clear it
Publishing, editing a post, or changing a menu clears the affected pages on its own. You need to clear it by hand after changing something the plugin cannot see you changed — a theme file edited over SFTP, a setting changed directly in the database.
Sites → your site → Cache → Clear.
"My change is not showing"
Check in this order, because it is almost always the last one:
- Clear the site cache from the screen above.
- Clear the CDN, if the change was to an image or a stylesheet.
- Check your own browser. Load the page in a private window. More than half of these are
a local cache, and no amount of clearing ours will fix it.
What is never cached
Logged-in sessions, carts, checkouts and admin screens. A shop does not serve one customer another customer's basket, and that is enforced rather than configured.
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