How to Run a Website Speed Test (and Sell the Fix)

Speed is a ranking factor and a conversion killer. How to test any site in minutes, read the results, and turn a slow score into a project.

Website speed is one of the few web design problems you can measure, prove, and sell in a single conversation. It is a Google ranking factor and a direct conversion killer, which makes a slow score one of the cleanest openings for a redesign pitch. Here is how to test any site and turn the result into work.

Why speed matters

Every extra second of load time sheds visitors, and on mobile the effect is brutal. Google folds speed into Core Web Vitals, so a slow site both ranks lower and converts worse. For a local business, that is lost calls and lost revenue.

How to run the test

• Google PageSpeed Insights. Paste in the URL and get mobile and desktop scores plus Core Web Vitals. It is free and it is the same engine Google uses.
• Test mobile first. Most local searches happen on phones, and mobile scores are almost always worse, so that is where the story is.
• Test a few key pages. The homepage, a service page, and the contact page tell you where the real drop-off is.

How to read the results

You do not need to memorize every metric. Focus on the three Core Web Vitals in plain terms:

• Largest Contentful Paint is how long until the main content shows up. Anything over a couple of seconds is a problem.
• Interaction to Next Paint is how quickly the page responds when someone taps or clicks.
• Cumulative Layout Shift is how much the page jumps around while loading, which is maddening on mobile.

A slow score is a number the owner can see, not an opinion they have to trust. That is what makes it so easy to sell against.

The common culprits you will fix

• Huge, uncompressed images.
• No caching and slow, cheap hosting.
• Bloated page builders and unused scripts.
• Render-blocking resources that delay the first paint.

Turn the score into a project

Screenshot the mobile score in red, put it next to a faster competitor, and translate it into money: half your visitors are leaving before the page even loads. Then offer a fixed price to fix it. Speed pairs naturally with the rest of a redesign and with local SEO work, so you are often getting paid twice for the same effort.

Find slow sites at scale

Testing one site is easy. Finding hundreds worth testing is the work. WebsiteLeadFinder grades every business website on performance and four other signals using Google PageSpeed, then ranks the businesses by how badly they need you, with contacts attached. Combine it with the audit-to-client workflow and every slow score becomes a lead.