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Website Speed Test — And What Slow Loading Actually Costs You

Runs a real Google Lighthouse audit on your site, checks your Core Web Vitals against Google's thresholds, and puts a euro figure on the customers a slow site is losing you. Add a competitor to see the two side by side.

Test as

Mobile is the default because that is how most Irish local searches happen — and it is the harder test, run on a throttled connection with a slowed-down CPU. Expect a noticeably lower score than desktop for the same site. Takes 20–40 seconds. Running the test asks nothing of you — no signup, no email. You can email the report to yourself afterwards if you want it, but you don't have to.

What this test measures

The test runs Google's own PageSpeed Insights API against your homepage on a simulated mobile device over a throttled connection — the same engine that produces the numbers Google shows in Search Console. Where Google holds enough real-user data for your domain, we show that instead of the lab result, and label it clearly.

The three Core Web Vitals

  • Largest Contentful Paint (LCP) — how long until the main content is visible. Good is 2.5 seconds or less.
  • Interaction to Next Paint (INP) — how quickly the page responds when someone taps. Good is 200 milliseconds or less.
  • Cumulative Layout Shift (CLS) — how much the page jumps around while loading. Good is 0.1 or less.

A site passes Core Web Vitals only when all three are in the good band for 75% of real visits. Most small business sites in Ireland fail on LCP, and the usual culprit is photographs uploaded straight off a phone at full resolution.

How the cost estimate works

We take your LCP, subtract Google's 2.5 second "good" threshold, and apply a conversion penalty of 4.4% per second to the revenue you told us you already make: 

seconds_over   = max(0, LCP − 2.5)
uplift         = min(40%, seconds_over × 4.4%)
monthly_loss   = visitors × rate × value × uplift

The 4.4% figure comes from Portent's analysis of site speed against conversion rate, and it is deliberately the conservative end of the published research — Deloitte's Milliseconds Make Millions study found a 0.1 second mobile improvement lifted retail conversions by 8.4%, which would produce far larger numbers than the ones shown here. The uplift is capped at 40% so a very slow site does not generate a fantasy figure. It is an estimate to size the problem, not a forecast.

Frequently asked questions

What is a good website speed score?

Google grades performance from 0 to 100. Anything 90 or above is good, 50–89 needs work, and below 50 is poor. The score is a summary — what actually matters for rankings and sales are the three Core Web Vitals: Largest Contentful Paint under 2.5 seconds, Interaction to Next Paint under 200 milliseconds, and Cumulative Layout Shift under 0.1.

Why is my website slow?

For most Irish small business sites the causes are the same handful of things: oversized uncompressed images, a WordPress theme loading a dozen plugins, render-blocking JavaScript, no caching, and cheap shared hosting with a slow server response. A five-page brochure site has no technical reason to take four seconds to load.

Do Core Web Vitals affect Google rankings?

Yes. Core Web Vitals are part of the page experience signals Google uses in ranking. They will not lift bad content above good content, but between two comparable pages the faster one wins — and on mobile, where most local searches happen, the difference is bigger.

How much does a slow website cost my business?

Research by Portent found conversion rates drop roughly 4.4% for each additional second of load time in the 0–5 second range. Deloitte measured the reverse: a 0.1 second improvement in mobile load time increased retail conversions by 8.4%. The calculator on this page applies the more conservative of the two to your own traffic and order value.

How do I make my website faster?

Compress and correctly size every image, remove plugins and scripts you do not need, serve the site from a CDN, and cache aggressively. If the site is heavy enough that none of that is sufficient, rebuilding it as a static site is the reliable fix — there is no database query and no server-side rendering on each visit, so pages arrive almost instantly.

My site is fast but customers still cannot find me. What else is wrong?

Speed is one of several things Google weighs, and for local searches it is rarely the deciding one. An unclaimed Google Business Profile, inconsistent contact details across the web, missing structured data, or no page targeting the service and town people actually search for will all outweigh it. We cover each cause and its fix in our guide to why an Irish business does not show up on Google.

Slow site? We rebuild it, fast.

If your test came back red, you have two options: spend weeks stripping plugins and compressing images on a platform that will slow down again in six months, or move to a static site that is fast by construction. We do the second, for €50 a month with nothing upfront — see how we build fast static sites or browse our affordable web design plans.

If the deeper problem is that customers can't find you at all, speed is only one of seven likely causes. Work through why your business isn't showing up on Google, and add the structured data Google needs with our free schema generator.

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