Page Speed Test
Free page speed test powered by Google Lighthouse — performance score, FCP, LCP, TBT, CLS and Speed Index plus prioritized fixes with estimated savings.
About the Page Speed Test
This free page speed test audits any public URL with Google Lighthouse via the official PageSpeed Insights API — the same engine behind Google's own testing tools. You get the 0–100 performance score plus the five lab metrics behind it: First Contentful Paint, Largest Contentful Paint, Total Blocking Time, Cumulative Layout Shift and Speed Index, each colour-coded good, needs-improvement or poor. Where Google has real-user CrUX data for your page, it is shown alongside.
The real value is the recommendations. The opportunities table lists concrete fixes ordered by estimated time savings — compress this image, remove that unused JavaScript, eliminate these render-blocking resources — so you always know the highest-impact change to make next. A diagnostics section adds deeper findings that don't carry a simple time estimate.
Speed compounds across everything: it is a Google page-experience ranking signal, a major driver of bounce rate (the probability of a bounce rises 32% as load time goes from 1 to 3 seconds, by Google's own research), and a direct factor in conversion. Test mobile first — it uses a simulated mid-range phone on slow 4G, which is what Google primarily ranks. Each run takes 20–40 seconds because your page is loaded and audited live.
How to Use the Page Speed Test
- 1Enter your page URL and pick mobile or desktop.
- 2Click Run Speed Test and wait 20–40 seconds for Lighthouse to finish.
- 3Review the performance score and the five metric cards.
- 4Work through the opportunities table top-down — biggest estimated savings first — and re-test after each fix.
Frequently Asked Questions
What is a good page speed score?
Lighthouse scores of 90–100 are good (green), 50–89 need improvement (orange), and below 50 are poor (red). Real-world sites commonly sit in the 50–80 range on mobile, so don't panic at orange. Chasing a perfect 100 has diminishing returns — getting your Core Web Vitals (LCP, INP, CLS) into the Good range matters more than the headline number.
Does page speed affect SEO?
Yes. Speed has been a Google ranking factor since 2010 on desktop and 2018 on mobile, and today it feeds the page experience signal through Core Web Vitals. Its ranking weight is modest compared to content relevance — but its effect on users is not: slower pages bounce more, convert less and earn fewer return visits, which feed back into weaker engagement signals.
Why is my score different every time I run the test?
Lighthouse loads your page live, so normal variability — server response time, third-party scripts, ad auctions, CDN cache state, test-server load — shifts the score a few points between runs. Treat the score as a range, run important tests two or three times, and judge progress by the metric values (LCP, TBT) rather than single-run score differences.
What is Total Blocking Time (TBT)?
TBT sums up all the time between First Contentful Paint and full interactivity when the main thread was blocked by long JavaScript tasks (over 50 ms), making the page ignore clicks and taps. Under 200 ms is good. It is the lab stand-in for INP, and it is heavily weighted in the Lighthouse score — usually the metric to attack if your score is low, typically by splitting, deferring or deleting JavaScript.
What are the quickest wins for a slow page?
In rough order of effort-to-impact: compress images and serve them in WebP/AVIF at the size actually displayed; enable caching and a CDN; defer non-critical JavaScript and remove unused scripts (old trackers and widgets accumulate); preload the LCP image; and reduce server response time with caching or better hosting. Your opportunities table shows which of these applies to your specific page.
What's the difference between this and the Core Web Vitals checker?
Same Google API, different focus. The Core Web Vitals checker centres on the three ranking-signal metrics (LCP, INP, CLS) with real-user field data front and centre. This page speed test is the broader engineering view: the full lab metric set, the complete opportunities table with estimated savings, and diagnostics — better suited to actually working through fixes.