The Free Chrome Tool That Shows You Exactly How Much Your Page Speed Is Costing You

Quick tip for anyone running paid traffic..

There's a free tool called Lighthouse built right into Chrome that shows you how fast your funnel is loading -- and the numbers matter more than most people realise.

Portent ran a study across 100 million page views and found that ecommerce pages loading in 1 second convert at 3.05%. At 4 seconds that drops to 0.67%. For lead gen pages it's even steeper -- nearly 40% at 1 second dropping to roughly half that by 6 seconds.

How to run it right now.. Open your funnel in Chrome. Right-click, select Inspect. Find Lighthouse (click >> if you can't see it). Select Mobile, tick Performance, click Analyze Page Load.

Here's what a real funnel scan looked like recently..

First Contentful Paint: 4.7s 🔴 (should be under 1.8s)

Largest Contentful Paint: 7.3s 🔴 (should be under 2.5s)

Total Blocking Time: 270ms 🟡 (should be under 200ms)

Cumulative Layout Shift: 0 🟢 (perfect)

Speed Index: 6.9s 🔴 (should be under 3.4s)

Three red signals on a live funnel. Based on the Portent data, an LCP of 7.3 seconds puts conversion rate below 0.67%. That's someone actively running ads to a funnel converting at a fraction of what it should be.

The most common causes Lighthouse flags are unoptimized images, render-blocking JavaScript, and third-party scripts loading before the page content. Most of these are fixable.

One important thing to know though..

That score is a snapshot. Page speed changes constantly. A new image upload, a JavaScript library update, a third-party script change -- any of these can quietly degrade your speed between checks without any warning.

So run the test. Fix what it surfaces. And make a habit of checking regularly.

Hope this helps someone today.

🚀

- James

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