Page speed

Definition
Page speed is how long a page takes to load and become usable. A faster page bounces less, converts more and ranks higher than a slow one.

Why it matters

Visitors do not wait. A slow page loses some of them before they have seen the headline, so every pound spent on ads or outreach that sends traffic there is partly wasted. Speed is also part of how Google judges page experience, so a slow page can be penalised in search as well. Mobile matters most, because phones have slower connections and weaker processors than an office laptop.

How to apply it

  • Measure first with a free tool such as Google PageSpeed Insights or Lighthouse, on mobile, before changing anything.
  • Fix the biggest cost first. Oversized images are the usual culprit, so resize and compress them and use modern formats.
  • Remove or defer scripts that are not needed for what the visitor sees first, such as chat widgets and extra tracking tags.
  • Serve static files from a CDN, a network of servers that delivers files from a location near each visitor.
  • Measure again after each change, and test the pages that earn money first, such as the home page, pricing and landing pages.

What it is

Page speed is not one number. It is a set of moments in a visit: when the first content appears, when the main content is visible, when the page responds to a tap, and whether things jump around while loading. Google groups these into Core Web Vitals. Largest Contentful Paint measures when the main content appears, and Google's published guidance treats 2.5 seconds or less as good. Interaction to Next Paint measures how fast the page reacts to input. Cumulative Layout Shift measures visual stability.

Common mistakes

  • Testing only on a fast office connection.
  • Adding tools, tags and widgets one at a time until the page slows to a crawl.
Worked example

A software company finds its demo page takes nearly six seconds to load on a phone. The page is rebuilt with compressed images served from a CDN, and scripts that are not needed at first are loaded later. Load time falls under two seconds and more visitors reach the booking form, with no change to the wording.

  1. Article

    Bounce rate

    The clearest symptom of a slow page.

  2. Article

    Landing page

    The page type where speed matters most.

  3. Article

    Technical SEO

    The wider work of making a site easy for search engines to use.

Where it shows up

  • Search engine optimisation (SEO) is getting found in search results without paying for ads. It is free in clicks but takes time and consistency to build.
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