Most business owners have never run a Lighthouse audit on their website. The ones who have usually see a number somewhere in the 50s or 60s, assume that’s fine, and move on.
It’s not fine. And it’s probably costing you more than you’d expect.
What Lighthouse actually measures
Google Lighthouse is a free tool that scores your website across four areas: Performance, Accessibility, Best Practices, and SEO. Each one is scored from 0 to 100.
The performance score is the one that bites people. It measures how fast your pages load — not just in theory, but under real-world conditions on real devices. It factors in things like how long before a user can see content, how long before they can interact with it, and how much the page shifts around while loading.
A score in the 60s means your site is noticeably slow. A score above 90 means it’s fast. The difference matters more than most people realize.
Three things a low score is quietly hurting
Your Google rankings. Core Web Vitals — a subset of what Lighthouse measures — are a confirmed ranking factor. A slow site is a signal to Google that you’re delivering a bad experience. That pushes you down in search results, quietly, without any error message telling you why.
Your paid ad performance. If you run Google Ads, your Quality Score is partly determined by landing page experience. A slow, underperforming page means you pay more per click than a competitor with a faster site. The same budget buys you less traffic.
Your conversions. Studies consistently show that every additional second of load time reduces conversion rates. A visitor who clicks your ad and waits three seconds for your page to appear is already halfway gone. On mobile, it’s worse.
What actually causes a low score
The culprits are almost always the same. Uncompressed images that are five times larger than they need to be. JavaScript and CSS files that load before the page content, blocking everything else. Plugins that add tracking scripts nobody asked for. Fonts loaded from external servers. Videos embedded directly instead of deferred.
None of these are exotic problems. They accumulate over time — a new plugin here, a theme update there — and nobody notices because the site technically still works.
What a real fix looks like
When I audited MedTrainer’s landing page funnel, every page was sitting in the mid-to-high 60s. After going through each one — compressing images, eliminating render-blocking resources, cleaning up unused scripts, and tightening up Core Web Vitals — the scores landed at 98 to 100 across the board. The minimum was 98.
That’s not a one-time trick. It’s methodical work: measure, identify, fix, verify. Repeat for each page.
The result is a site that loads fast, ranks better, converts more, and costs less to advertise against.
The simplest thing you can do right now
Go to pagespeed.web.dev, enter your homepage URL, and run the test. Look at your mobile score — it’s almost always lower than desktop and it’s the one that matters more for most businesses today.
If you’re below 80, there’s room to improve. If you’re below 70, it’s worth fixing soon.
If you want a second opinion on what’s holding your score back, that’s exactly the kind of thing I look at.