Page speed tools are everywhere. Google PageSpeed Insights, GTmetrix, Pingdom, WebPageTest. They all tell you how fast your page loads. None of them tell you how much that speed is costing you in conversions.
Our page speed analyzer gives you the real Google Lighthouse metrics — same data as PageSpeed Insights — plus the conversion context that matters. Because knowing your LCP is 3.8s is useful. Knowing it's costing you approximately $12,000/month in lost conversions is actionable.
The metrics that matter
We pull four Core Web Vitals directly from Google's Lighthouse engine:
- LCP (Largest Contentful Paint) — When the biggest element loads. Good: under 2.5s. Your hero image or headline. This is the metric Google weights most heavily for ranking.
- CLS (Cumulative Layout Shift) — How much the page jumps around while loading. Good: under 0.1. Nothing kills trust faster than buttons moving while you try to click them.
- FCP (First Contentful Paint) — When the first content appears. Good: under 1.8s. The difference between "loading" and "something is happening."
- INP (Interaction to Next Paint) — How fast the page responds to clicks. Good: under 200ms. Sluggish buttons feel broken.
Speed and conversion: the data
From our analysis of thousands of pages:
- Pages loading in 1 second convert at 3× the rate of pages loading in 5 seconds
- Each additional second of load time costs approximately 7% in conversions
- The relationship has diminishing returns — going from 5s to 2s is transformative, going from 1.5s to 1.2s is marginal
This means speed optimization has a measurable ROI. We calculate that ROI for your specific page based on your performance data.
Beyond speed scores
A fast page with terrible messaging still won't convert. That's why our analysis includes all 8 conversion dimensions alongside performance data. Speed is one factor — an important one — but it's 7% of the weighted score. The other 93% is messaging, trust, CTAs, and design.