Is a Slow Website Costing You Sales? Speed Explained

Speed is the most underrated thing about a website. A site can look beautiful and still bleed customers, because the first thing every visitor experiences isn’t your design or your words — it’s the wait. And if the wait is too long, they’re gone before either of those gets a chance.

Here’s why speed matters for both sales and search, what Core Web Vitals actually are, and how to tell if your site is quietly too slow.

Is a slow website really costing you sales?

Yes. Visitors decide in seconds whether to stay, and a slow load spends that patience before your message even appears. Many people leave a sluggish page within the first few seconds — and each one is an enquiry or sale you never see, because they don’t complain, they just click back. Faster pages hold more visitors and convert more of them. Speed isn’t a technical nicety; it’s revenue.

It’s the same invisible loss a poor site creates: you can’t miss the customers who left before they reached out.

What are Core Web Vitals?

Core Web Vitals are Google’s three measures of how a page feels to use. They put numbers on the experience:

• Largest Contentful Paint (LCP) — how fast the main content loads. Target: under 2.5 seconds.
• Interaction to Next Paint (INP) — how quickly the page responds when you tap or click. Target: under 200 milliseconds.
• Cumulative Layout Shift (CLS) — how stable the page is as it loads (no buttons jumping around). Target: under 0.1.

Google explains them in full in its Core Web Vitals guide. Together, they’re a fair proxy for “does this site feel fast and solid, or slow and janky?”

Does speed affect your Google ranking?

Yes. Google uses page experience, including Core Web Vitals, as a ranking signal. It won’t rescue thin content — a fast empty page won’t beat a slow brilliant one — but between two similar pages, the faster, more stable one has the edge. And a genuinely slow site can be held back no matter how good its content is.

There’s a bonus, too: the same clean, fast setup that pleases Google also helps your site get found and recommended by AI answer engines. Speed pays twice.

What makes a website slow?

Speed problems almost always trace to a handful of usual suspects:

• Huge images — the number-one culprit; uncompressed photos that are far bigger than they need to be
• Bloated pages — heavy themes, sliders, and effects that pile on weight
• Too many add-ons — every extra plugin or script is more to load
• Cheap or overloaded hosting — the site can only be as fast as the server it sits on
• No caching — the site rebuilds everything from scratch on every visit

The good news: most of these are fixable, and none require rebuilding the site from zero.

How to tell if your site is too slow

Two quick checks:

1. Run Google PageSpeed Insights — paste in your URL and it scores your Core Web Vitals and lists exactly what’s slowing you down, for both mobile and desktop.
2. Test it yourself on a phone, on mobile data — not on your fast office wifi. If you find it slow, so does everyone else.

If it’s slow, that’s often one of the signs a site needs attention or a redesign — though speed can frequently be fixed without a full rebuild.

Speed drifts — it needs upkeep

Here’s the part people miss: a site that launched fast doesn’t stay fast on its own. Over time you add pages, images, and plugins, and the site quietly slows down. That’s why speed isn’t a one-off — it’s part of ongoing website maintenance, the occasional tune-up that keeps images optimised, plugins lean and caching working.

We keep client sites quick as a matter of course on a care plan — because a fast site on launch day that’s crawling a year later has quietly given back everything it earned. It’s one of the core things a good website gets right, and keeps getting right.

Wondering how fast your site really is, and what a slow one is costing you? Ask us to check it. We’ll run the numbers, tell you what’s dragging it down, and whether it’s a quick tune-up or something more.