How Our Performance Test Works
You enter your web address, hit test, and within 30 seconds you get a full report. No sign-up, no account — just results.
The test runs on both mobile and desktop simultaneously, so you see exactly how your site performs for both types of visitors. Under the hood, it uses the same analysis engine that Google themselves use to evaluate websites in their search results — so the results aren’t just interesting, they’re directly tied to how your site ranks.
What the Report Shows
Overall Grade (A–F)
The first thing you see is an overall grade from A to F, based on the average of four categories. It gives you an immediate sense of where you stand — is your site in good shape, or are there serious issues that need attention?
Four Categories
The report scores your site across four areas, each on a scale from 0 to 100:
- Performance — how fast the site loads. This is what most people think of when they talk about “speed.” It measures everything from when the first content appears to when the page is fully interactive.
- Accessibility — whether the site works for all visitors, including those using screen readers or navigating with a keyboard. Important both ethically and for SEO.
- Best Practices — technical hygiene. Does the site use HTTPS? Are there console errors? Are modern image formats being used? Things that are often overlooked but affect both security and user experience.
- SEO — whether the site has the technical foundations for search engines to understand and rank it. Meta tags, heading structure, mobile-friendliness, and more.
Detailed Performance Metrics
Below the scores, you’ll find specific metrics showing exactly where the time goes:
- First Contentful Paint — when the visitor first sees something on screen. Under 1.8 seconds is good.
- Largest Contentful Paint — when the main content (hero image, headline) is fully visible. Under 2.5 seconds is good.
- Time to Interactive — when the page actually responds to clicks and input. Under 3.8 seconds is good.
- Layout Stability — whether elements jump around while the page loads. 0 is perfect, under 0.1 is good.
Real User Data
One of the most valuable parts of the report. When enough data is available, we show how real Chrome users have experienced your site over the last 28 days. This isn’t a simulation — it’s actual data from actual visitors.
For each metric, you see a distribution in green (good), yellow (needs improvement), and red (poor). It gives an honest picture of how visitors actually experience the site, not just how it performs in a lab.
Smaller websites may not show this section — Google needs enough traffic to have meaningful data.
Security Analysis
Beyond performance, we run a separate security scan that checks 10 different security configurations on your site — things like HTTPS redirection, HSTS, Content Security Policy, and clickjacking protection.
You get a security grade and can see how many tests passed versus failed. Most websites have room for improvement here — these are things that are often forgotten during web development but protect both you and your visitors.
Improvement Opportunities
At the bottom of the report, you’ll find specific improvement suggestions, ranked by impact. Each suggestion shows how many milliseconds could be saved, an explanation of the issue, and what’s needed to fix it.
This is where the test goes from interesting to useful — you don’t just get numbers, you get a roadmap for what needs to be done.
Get the Report Sent to You
If you want to save the results or share them with a colleague, you can enter your email before running the test. We’ll send a nicely formatted report straight to your inbox with all scores, grades, and improvement suggestions.
It’s completely optional — the test works just as well without it.
Why We Built This
At Developly, we work with web development every day, and we kept running into the same problem: business owners didn’t know their website had performance issues until it was already costing them customers and search rankings.
Using Google’s own developer tools requires technical knowledge. Interpreting raw Lighthouse data isn’t intuitive. We wanted to make it easy for anyone to get a clear picture of their site’s health — without needing to be a developer.
The result is a tool that combines performance analysis, security checks, and real user data in a single report, with clear explanations instead of technical jargon.
Test Your Site Now
Head over to our performance test, enter your web address, and see how your site actually performs. It takes 30 seconds and costs nothing.
If the results show room for improvement, we’re happy to help. Get in touch for a free walkthrough of what can be done to make your site perform better, rank higher, and convert more.
Developlys performance test