Page speed
Page speed is how quickly a web page loads and becomes usable for a visitor, measured with metrics such as how fast the main content appears and how quickly the page responds to a tap or click.
There is no single page speed number. Different tools measure different moments, and Google's own measures, the Core Web Vitals, focus on three: Largest Contentful Paint for loading, Interaction to Next Paint for responsiveness and Cumulative Layout Shift for visual stability. A page can load fast and still feel slow if it freezes when tapped.
Speed is a ranking factor, but a modest one. A fast page with weak content will not outrank a slower page that answers the search much better. Its bigger effect is on people: slow pages lose visitors before they read anything.
How it works
Google's thresholds for a good experience are a Largest Contentful Paint of 2.5 seconds or less, an Interaction to Next Paint of 200 milliseconds or less and a Cumulative Layout Shift of 0.1 or less, measured at the 75th percentile of real visits. PageSpeed Insights shows field data from real Chrome users, where enough exists, alongside a lab test that simulates one load.
Most slow pages share the same causes: oversized images, too much JavaScript, slow hosting and third-party scripts such as chat widgets and trackers. The usual fixes are image compression and modern formats, lazy loading for images further down, caching, a CDN and removing scripts nobody needs.
Lab and field data answer different questions. A lab test runs one load on a simulated phone and network, which makes it repeatable and useful for finding causes. Field data comes from the Chrome User Experience Report, a sample of real visits over the previous 28 days, so it shows what visitors actually experienced but changes slowly after a fix. Small sites may not have enough traffic for page-level field data, in which case PageSpeed Insights falls back to data for the whole site or shows the lab test only.
Example
A catering company's homepage opens with a full-screen video and four large photos, and on a phone over mobile data the menu takes several seconds to appear. The developer replaces the video with a compressed still image, converts the photos to a modern format, delays the chat widget until after load and moves the site to faster hosting. The page now passes the Core Web Vitals thresholds and the menu appears almost at once.
The lab result improves the day the changes go live, but the Core Web Vitals report in Search Console takes several weeks to catch up, because it reflects the previous 28 days of real visits. The owner also notices that the contact page still jumps as a map widget loads late, and reserving space for the map in the layout stops the shift.
Why it matters for your business
Slow pages cost enquiries, especially on phones over mobile data, where many local customers first meet a business. Speed work usually has a clear, one-off cost and a lasting effect. The trade-off is diminishing returns: moving from slow to good matters a great deal, while chasing a perfect lab score on a page that already passes rarely changes anything for visitors or rankings. Hosting is often the hidden factor: slow, overcrowded hosting can blunt every other fix.
Common mistakes
- Testing only on a fast office connection and a desktop computer.
- Chasing a lab score of 100 while ignoring field data from real visitors.
- Adding plugins and third-party scripts one at a time without checking their combined weight.
- Uploading photos straight from a camera without resizing or compressing them.
Questions people ask
How do I check my page speed?
Run the page through Google's PageSpeed Insights, which shows real-user data from Chrome where available and a simulated lab test with suggestions. The Core Web Vitals report in Google Search Console shows which groups of pages pass or fail across the site. Test on a real phone too, not only on a desktop.
What is a good page load time?
Google's guide is that the main content should appear within 2.5 seconds for most visits, measured as Largest Contentful Paint at the 75th percentile, with interactions responding within 200 milliseconds. Faster is better for visitors, but passing these thresholds is a sensible target for most business sites.
Does page speed affect SEO?
Yes, but modestly. Page experience, including Core Web Vitals, is one of many signals Google uses, and relevance matters far more. A slow page can still rank if it is the best answer. Speed matters more for keeping visitors once they arrive and turning them into enquiries.
