PageSpeed score is 90+ but visitors experience the site as slow.
PSI Lab data and Real User Metrics (RUM) show different worlds. Lab is a controlled test; RUM is what users actually feel.
Try this first
- 1Open PSI and look at Field Data (CrUX, real-user). That's the reality over the last 28 days, not the Lab test.
- 2Compare Lab and Field. Lab 90 with Field red means: typical visitor has slow connection, mobile data, or an old device.
- 3Add a real RUM tool: Cloudflare Web Analytics (free), Vercel Analytics, or a full suite like SpeedCurve. Real users reveal what plugins don't.
- 4Segment per device and per country. Mobile in the regions has a different experience than desktop in the city.
- 5Focus on p75-LCP, not average. Google ranks on p75. If 25 percent of users feel slow, you are slow.
- 6Iterate: spot the weak segments, find the bottleneck (image, font, third-party script), fix, measure again.
When to bring us in
Marketing-heavy site with many third-party scripts (chat, analytics, retargeting)? Performance engineering is a specialty. A performance engineer can win a lot in a week.
See also
- WordPress, plugins and theme have gone 6+ months without updatesOut-of-date WP is the number-one entry for malware. Don't just hit 'update all', back up first.
- Theme update broke the layout or threw a fatal errorThemes overwrite custom CSS on update unless you use a child theme.
- WordPress shows a blank screen after a plugin install or updateWSOD (white screen of death) is usually one crashing plugin. You isolate it.
None of the above fits?
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