Redis, page cache and edge caching after an AI to WordPress migration
How to design a layered caching stack with object cache, full-page cache and a CDN for a fast converted WordPress site.
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Why caching matters more after migration
AI builders typically host static or edge-rendered pages, which are very fast by default. WordPress generates pages with PHP and database queries, so without caching a converted site can feel slower than the original. A proper caching stack closes that gap and usually surpasses the old performance.
Layer one: object cache
A persistent object cache such as Redis stores the results of database queries in memory. It speeds up the dashboard, logged-in users and uncached pages. Most managed hosts offer Redis with a single switch; a drop-in plugin connects WordPress to it.
Layer two: full-page cache
A full-page cache stores the complete HTML of each page and serves it without running PHP. This can be done at the server level with Nginx FastCGI cache or Varnish, or with a caching plugin. Exclude cart, checkout and account pages, and purge the cache automatically when content changes.
Layer three: CDN and edge
A CDN serves images, CSS and JavaScript from locations close to the visitor and can cache full HTML pages at the edge. Configure cache rules carefully: respect cookies for logged-in users, keep the canonical domain consistent and make sure redirects are handled before caching so search engines always receive the correct status code.
Measuring the result
Test time to first byte from several regions, check Core Web Vitals in field data and verify that cache headers are present. A well-tuned stack typically delivers HTML in well under 200 milliseconds for cached pages.