Cache Warmup with the "warming" Extension

What Is Cache Warmup and Why Do You Need It?

TYPO3 stores rendered pages in the frontend cache so they can be delivered instantly on every subsequent request instead of being rebuilt from scratch. After every cache clear – for example after a deployment, a content change, or a scheduled cache flush – this cache is empty, though. The first request to a page then hits a "cold" cache: TYPO3 has to fully recompute the page, which noticeably takes longer.

The extension "warming" (eliashaeussler/typo3-warming) automates exactly this process: it reads the website's XML sitemap, actively requests every URL listed in it, and proactively fills the cache before real visitors or search engine crawlers ever load the pages. This works for entire websites via the sitemap, or specifically for individual pages via their page ID, including across multiple languages.

Requirements and Installation

The extension is added via Composer as usual:

It supports PHP 8.2 through 8.5 and TYPO3 13.4 LTS through 14.3 LTS. The only content requirement: at least one XML sitemap must exist. TYPO3 already provides this via the core extension seo, so no additional setup is needed in most projects.

Warming the Cache Manually or Automatically

For the actual warmup, the extension offers several options:

Backend toolbar and page tree: an icon in the backend toolbar opens a warmup dialog for the entire website; in the page tree, the same process can be triggered specifically for a single page and its subpages – handy for editors after major changes, with no console access required.

Console commands: for developers and automated workflows, the command warming:cachewarmup is available, which processes either the entire sitemap or individual page IDs. The additional command warming:showuseragent shows the user agent the crawler uses – useful for explicitly allowing it in a firewall or security plugin, for example.