Tag
Making WordPress sites load faster.
WordPress Tutorials
The PageSpeed warnings about unused JavaScript, unused CSS, cache policy and script execution each have a WordPress-specific cause, a code fix, a plugin fix and a way to break the site.
Troubleshooting
A high TTFB is either a cache that is not being hit or a PHP request that does too much work. Measure which one you have before changing anything, because the fixes do not overlap.
WordPress Tutorials
A failed Core Web Vitals assessment on WordPress is usually an LCP problem. Read the field report, split LCP into its four parts, and fix the part that is actually slow.
WooCommerce
A store has two halves: catalogue pages that can be cached like any site, and cart, checkout and account pages that never can. Speed each half with different tools.
Troubleshooting
A slow WordPress site is slow in one layer: the server, the page, one heavy template, the admin or logged-in sessions. Two measurements tell you which, and the fix follows from that.
Troubleshooting
The fatal names a file and a line, and that line is where PHP was when the clock ran out — not necessarily what was slow. Raising the limit buys time; reading the trace tells you what was spending it.
WordPress Tutorials
Deferring a script with this filter detaches it from the dependency order WordPress maintains, and any inline script attached to it runs before it loads. Core has had a strategy argument since 6.3 that handles both; the filter remains for what the argument cannot express.
WordPress Tutorials
The hook fires on every admin page and passes the current screen's hook suffix, which is the only thing standing between a plugin that loads one file on one screen and a plugin that slows the whole dashboard.
WordPress Tutorials
Setting this to zero does not shorten the retention period. It removes the trash entirely, so Move to Trash becomes Delete Permanently and there is nothing to restore from.
WordPress Tutorials
The constant does not cache anything. It tells WordPress to load one file very early, and if that file is missing or left behind by a removed plugin, the result is a site that either ignores the setting or fails to load at all.
WordPress Tutorials
Raising this number is widely recommended as a database cleanup measure, and it is not one. Autosaves reuse a single row per author, so the thing people are trying to trim is revisions, which this constant does not touch.
WordPress Tutorials
This is the last filter before a template is loaded, and it is one of the few where returning nothing produces a blank white page rather than a default. Whatever the callback returns is loaded, including an empty string.