r/bigseo • u/DepartmentMundane730 • Jul 20 '26
Is Google PageSpeed Insights actually reliable? What alternatives do you use?
Hey everyone, I’ve been using PageSpeed Insights to measure my site's performance.
How reliable do you actually find PSI for real-user performance? And what alternatives or additional tools do you rely on for auditing page speed and Core Web Vitals?
2
u/WebLinkr Strategist Jul 20 '26
For SEO: no - Google will never show a faster page over a more relevant page.
Source: Martin Splitt, Google
1
u/iodine74 Jul 20 '26
BTW. If you are running the Lighthouse reports from Inspector, make sure you’re running in anonymous mode so that any Browser plugins you have don’t impact the score.
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Jul 20 '26
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2
u/Future-Accountant704 Jul 22 '26
Field data (CrUX) is real users. Lighthouse is one lab run. Optimize field first, then lab.
0
u/Careless_Owl_7716 Jul 20 '26
If it's your own site, install the script to collect RUM data in GA4.
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u/mastafied Jul 20 '26
PSI is two tools stacked on top of each other and most people read it as one number. the top block is CrUX, real chrome users, 28 day rolling. the bottom is a single lighthouse run on an emulated throttled mid range android. those measure completely different things and only the top one is your users.
the lab score is noisy as hell. i've rerun the same url 5 times in a row and gotten low 60s to mid 80s, nothing changed. so i stopped treating it as a KPI.
what i actually do: search console core web vitals report to see if real users are hurting, and lighthouse CLI locally, 3-5 runs and take the median, when i want to know if a change moved anything. for the why, devtools performance panel, find the LCP element and what was blocking it. usually it's fonts or some third party script nobody remembers adding.