Page performance monitoring
Speed rarely drops all at once. It's more often a plugin update here, an uncompressed image there, or a third-party script that takes a little longer than it used to, and each one is small enough to miss. Together, they can make a real difference to your visitors and your rankings.
Powered by Google PageSpeed Insights, the same tool Google offers for testing page speed.
What we check
SiteVitals uses Google PageSpeed Insights to test your monitored pages, then keeps those results so you can see whether performance is improving, holding steady or quietly getting worse. Individual test scores naturally fluctuate, so the value is in the pattern over time - and in seeing performance changes alongside everything else happening to the site.
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The Lighthouse performance score gives you a useful lab-test summary of how the page performed during that scan. We track the score over time rather than treating one isolated number as the whole story.
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Measures how quickly meaningful page content appears and whether the main content arrives promptly enough to feel fast.
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Highlights work that blocks the main thread and layout movement that can make a page feel sluggish or frustrating even when it technically loads.
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Surfaces oversized or inefficient assets which often creep in through normal content updates and gradually make pages heavier.
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Looks at opportunities to avoid unnecessary downloading and repeated work, including asset caching and delivery inefficiencies.
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Every result sits in context. SiteVitals maps performance onto the wider site timeline so you can compare a slowdown with deployments, content changes, incidents and other monitored events.
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A single PageSpeed test tells you how a page performed then. The useful question is whether it is getting better or worse.
See it in action
Not a mock-up or a marketing screenshot. This is an actual SiteVitals performance report, using Google PageSpeed Insights data and translating it into scores, findings and practical recommendations you can work with.
The report above is interactive. The free speed test gives you the same kind of point-in-time analysis for your own page; continuous monitoring adds the history that lets you see when performance changes.
Test your own pageHow performance monitoring works
PageSpeed results are not perfectly static. Network conditions, simulated device performance and other test conditions can move scores slightly from one run to the next.
SiteVitals keeps the history so those normal fluctuations can be seen in context. When a meaningful regression appears, you have the previous results to compare against rather than a single isolated score with nothing behind it.
Because performance lives on the same SiteVitals timeline as uptime incidents, content changes and other site events, you can also see what else changed around the same time. That makes it much easier to investigate whether a slowdown followed a release, an image upload, a third-party change or something else entirely.
Get started with our free tools today. When you're ready for continuous performance monitoring, our plans are simple, transparent, and built for sites of all sizes.
If something isn't covered here, just ask us. We're a small team and we answer our own emails.
Free performance snapshot
Google PageSpeed Insights produces a lot of metrics and opportunities. Our free speed test uses that data and turns it into prioritised guidance about what matters, why it matters and what is worth fixing first.
It is a point-in-time snapshot. Continuous monitoring is what shows you whether those numbers are drifting over time.
Want SiteVitals to keep watching? Start continuous monitoring ↗
