Mobile Page Speed: Is Your Website Fast Enough?

Mobile page speed is the one thing about a website that a customer notices before they've read a single word. Someone stood in a car park deciding whether to ring you or the next name on the list isn't going to wait around for a heavy homepage to finish loading. Here's what Google actually measures, how to check your own site for free, and what genuinely moves the number.

What counts as fast enough for mobile page speed?

Google's own performance framework, Core Web Vitals, sets three thresholds it calls "good". Google's published thresholds are: the main content should appear within 2.5 seconds (Largest Contentful Paint), the page should respond within 200 milliseconds once someone taps something (Interaction to Next Paint), and nothing should visibly jump around while the rest of the page catches up (Cumulative Layout Shift, kept under 0.1).

These aren't measured in a lab. Google scores a site against real visits, and rates it "good" only once at least three in four of those visits meet all three thresholds. The numbers are the same for mobile and desktop, but Google itself notes they were set with mobile hardware in mind, because that's where they're hardest to hit.

Does mobile page speed actually affect where you rank on Google?

A little, and mostly as a tiebreaker. Google's own page experience documentation is explicit that it always tries to show the most relevant content first, even when the page experience is sub-par. A genuinely useful page on a slow site can still outrank a fast, empty one. Where speed earns its keep is when two or three local businesses have written a similarly good answer to the same search: the faster page tends to have the edge.

In other words, speed is a real signal, worth fixing where you easily can, but it's not the lever that gets an otherwise thin page to the top. Content that actually answers a customer's question still does most of the work.

What actually slows a small business website down?

A handful of things account for most of it, and none of them are exotic:

• Full-size photos. A phone photo straight off a camera can be several megabytes; a web page rarely needs more than a few hundred kilobytes per image.
• Autoplay video. A background video on the homepage looks smart and costs more loading weight than almost anything else on the page.
• Stacked third-party scripts. A chat widget, a booking embed, an analytics tag and a marketing pixel all sitting on the same page each add their own load time, on top of the site itself.
• Overloaded shared hosting. Budget hosting puts many sites on one server, so your page's speed depends partly on how busy everyone else on it is that day.
• A heavy page builder. Drag-and-drop tools that generate a lot of underlying code to give you flexibility often ship more of it than a hand-built page needs, whichever platform is doing the building.

Worth testing on an actual phone, on actual mobile data, not just wifi on a desk in the office. A site that loads instantly over broadband can crawl on the patchy signal outside a job, which is exactly where a lot of local service businesses get searched for in the first place.

How do you check your own site's speed for free?

Google's own PageSpeed Insights tool, at pagespeed.web.dev, tests any public web address and scores it against the same Core Web Vitals thresholds described above, separately for mobile and desktop. Paste in your homepage and your most-visited inner page, the one people land on from a search or a Google Business Profile link, since that's the page a stranger actually sees first.

Where the tool has enough real visitor data, it shows what's actually happened for people who visited your site, not just a simulated test. Where it doesn't, usually because the site is new or gets few visits, it falls back to a lab test on Google's own servers, which is a reasonable stand-in but not quite the same thing.

What can you actually do about it?

Compress photos before uploading them rather than after, most photo apps and free online tools do this in seconds. Drop the autoplay video if the homepage has one. Ask whoever set up your chat widget or booking system whether it's still needed, and remove anything that isn't. And ask directly what your hosting actually includes, because "hosting" on a £3 a month plan and "hosting" on a proper managed setup are not the same product wearing different prices. An embedded Google Map on the contact page is another common culprit, worth swapping for a plain link to your listing if the map itself isn't doing any real work on the page.

If you're weighing up a DIY site builder against something built for you, speed is worth putting on the list alongside price. A drag-and-drop builder can genuinely get a business online in an afternoon, and for some businesses that's the right call, but the underlying code it ships to make that possible is heavier than a page built specifically for one site. This guide weighs up that trade-off properly rather than as a single line here.

Every site we build starts on hosting we control, with images optimised before they ever reach the page, from £495 with hosting, security, backups and edits from £69 a month. Get a private preview before anything is owed.

Frequently asked questions

What is a good page load time for a mobile website?

Google's own Core Web Vitals set the bar: the main content should appear within 2.5 seconds, the page should respond to a tap within 200 milliseconds, and nothing should visibly jump around while it loads. That's measured against real visits to your site, not a lab test, so it reflects what your actual customers experience on their actual phones.

Does a slow website hurt my Google ranking?

A little, and only as a tiebreaker. Google's own documentation says it always tries to show the most relevant content first, even if the page experience is sub-par, and that great content on a slow page can still rank. Where speed matters is when several businesses have written a similarly good answer to the same search: the faster page tends to have the edge.

Can I check my own website speed for free?

Yes. Google's PageSpeed Insights tool tests any public URL and scores it against the same Core Web Vitals thresholds Google itself measures, on both mobile and desktop, with no account or payment needed.

Will my website get slower over time even if nobody changes it?

Usually yes, gradually. Extra photos, an added booking widget, a new tracking script, a plugin update, each one adds weight on its own. Nothing breaks in an afternoon; a site that was fine at launch just quietly picks up seconds over a year or two, which is why it is worth rechecking occasionally rather than only when it starts to feel slow.

Is a cheaper hosting plan going to make my site slower?

It can. Budget shared hosting puts many websites on one server, so your site's speed depends partly on how busy everyone else on that server is, not just your own page. It is one of several things worth asking about before you sign up for hosting, alongside what backups and security are actually included.