Site speed feels like a technical detail. It is not. It is a sales number wearing a technical costume. When a page loads slowly, a portion of your visitors leave before they ever see your offer, and the ones who stay convert at a lower rate. Google also folds page experience into its ranking systems, so a slow site earns less traffic in the first place. Core Web Vitals are how Google measures all of this, and they are worth understanding even if you never write a line of code.
What Core Web Vitals actually measure
Core Web Vitals are three measurements Google collects from real Chrome users on your site:
- Largest Contentful Paint (LCP) is how long the main content takes to appear. The target is under 2.5 seconds.
- Interaction to Next Paint (INP) is how quickly the page responds when someone taps or clicks. The target is under 200 milliseconds.
- Cumulative Layout Shift (CLS) is how much the page jumps around while it loads. The target is a score under 0.1.
These are not lab numbers produced on a developer's laptop. They come from actual visitors on actual devices, including the four year old phone on one bar of signal. That is why a site that feels fine on your office wifi can still fail.
Why slow pages cost money
The research here has been consistent for over a decade. Amazon engineers found that every 100 milliseconds of added latency cost roughly 1 percent of sales. Google's mobile research showed that as load time goes from one second to three seconds, the probability of a bounce rises 32 percent. A joint Deloitte and Google study measured a 0.1 second speed improvement producing conversion lifts of around 8 percent for retail sites. The exact numbers vary by industry. The direction never does: faster pages sell more.
There is a second effect. Core Web Vitals feed Google's page experience signals, so between two pages of similar relevance, the faster one tends to rank better. Speed buys you conversions and traffic at the same time, which is why we call it a multiplier.
What usually slows small business sites down
When we audit small business sites, the same handful of problems appear:
- A heavy theme and a stack of plugins that rebuild every page on every visit
- Photos uploaded straight from a camera or phone at full resolution
- A pile of marketing tags and tracking pixels, each loading its own scripts
- Budget shared hosting that takes over a second to send the first byte
- Banners, pop-ups, and late loading fonts that shove content around and wreck the layout shift score
None of these are exotic. They accumulate quietly over years of small decisions, and each one alone looks harmless.
A checklist you can run this week
You do not need a developer to get a first read on where you stand:
- Run your homepage, your best selling product or service page, and your contact page through PageSpeed Insights at pagespeed.web.dev. Look at the mobile scores. Mobile is where most sites lose.
- Open Google Search Console and check the Core Web Vitals report. It shows pass or fail based on real visitor data, not a simulation.
- Check the file size of your homepage images. Anything over 500 KB is a candidate for compression.
- Count your marketing tags. If you cannot say what a tag is for, it is probably costing you speed for nothing.
- If you are failing, get the numbers in writing before paying anyone to fix it. Ask which metric will improve, by how much, and how the result will be verified.
How we build for speed
Our default stack is a Next.js front end published as static pages on a global CDN, with content managed in Directus. Pages are built once and served instantly, images are resized and converted automatically, and there is no plugin stack or database call standing between your visitor and your content. Speed comes from the architecture, not from a caching plugin patched on afterward. Sites built this way pass all three Core Web Vitals without ongoing tuning.
If you want to know what your current scores are costing you, Analog Elk offers performance audits and builds fast, Directus backed marketing sites for small businesses.