Web Page Test and other performance testing tools

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Web Page Test gives you a clearer picture of your site's performance globally. Plus, you can customize tests to match real-world conditions.

Expert Tip : If you want a faster overview, tools like PageSpeed ​​Insights also report render-blocking resources.

The typical method is:

Start with a desktop test
Choose a server far from your website host.
Use Chrome unless you have a reason to choose another browser.
You can adjust these settings under the “ Advanced Configuration ” tab .

Screenshot of the WebPageTest tool with fields for URL, location, and browser to test.
Click “ Start Test ” and review the results.

WebPageTest results.
You'll now see a more detailed waterfall chart. Clicking on it rcs data turkey opens a full-size version where you can spot render-blocking JavaScript and CSS files.

Cascade display of WebPageTest to eliminate render-blocking resources.
In this example, there are 32 render-blocking resources—mostly CSS files, with some JavaScript files mixed in.

It's easy to understand why JavaScript can block rendering, but so can CSS. The browser can't fully display the page until it has all the necessary styles. If an important CSS rule loads late, your page could pause until it's ready.

This is why optimizing CSS and JS delivery is essential, and that's exactly what we'll cover next.