HOSTING TIPS ARCHIVE
Caching: hosting guides
Practical steps and checks for hosting, WordPress and performance. Browse a topic or use the dates to explore the experience behind the advice.
6 guides, newest work first.
Running Varnish in front of a Redis page cache, without stale pages
Varnish and a Redis page cache can make WordPress very fast together, but only if they purge as one. The VCL and purge rules that keep both caches honest.
Background cache refresh needs a budget too
Serving an older page briefly can keep a site responsive. Rebuilding everything at once can undo the benefit.
Move large cache clears into a background queue
Clear large caches in bounded batches, keep the admin request short and show whether the job has finished.
A shared Redis service needs boundaries for clearing as well as storing
I make a site’s cache clear stay inside that site. Prefixing writes is only half of the job.
PHP in the browser and PHP in cron must agree on the cache
The same cache key is not enough. Every process that reads it has to understand the value written underneath it.
A slow cache should not hold the whole site hostage
I put a time budget around Redis so that a temporary cache problem does not quietly occupy every PHP worker.
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