Not every performance metric deserves equal attention. Here is the order that actually improves both rankings and conversion.
Test on the device your customers actually use
Performance scores taken on a fast laptop over office broadband describe a visitor you rarely have. Most traffic arrives on a mid-range phone on a patchy connection. Throttle your testing accordingly, or you will optimise a problem you do not have.
Fix Largest Contentful Paint first
This is how long it takes for the main content to appear, and it correlates most directly with people leaving. Usually the culprit is an oversized hero image, a render-blocking stylesheet, or a font that delays text appearing. All three are fixable without rebuilding anything.
Then eliminate layout shift
Content that jumps as the page loads is the fastest way to make a site feel broken, and it causes mis-taps on mobile. The cause is almost always images or embeds without dimensions reserved in advance. Set width and height attributes and most of it disappears.
Interaction delay is usually third-party scripts
When a page looks ready but does not respond, something is occupying the main thread. Audit third-party tags honestly — chat widgets, heat mapping, several analytics tools doing overlapping jobs. Removing two rarely-used scripts often beats a week of code optimisation.
Treat it as maintenance, not a project
Performance regresses. A new tracking script, an uncompressed image uploaded by a well-meaning editor, a plugin update. Check quarterly rather than treating speed as something you fixed once in 2024.
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