14 Tools We Use to Audit Performance of a WordPress site

Best WordPress speed test tools are about more than a site loading in under a certain number of seconds. Several other factors matter too. Here are the tools and services I use to audit or test a WordPress site. They work for any site, not just WordPress.

1. Your Eyes – The Eye Test

Do not get me wrong. Take WP Rocket, for example. It prefetches inner pages in the background and loads pages instantly on navigation. That gives a much better user experience.

I have not seen any tool that can measure that feeling. Whether your tools give a perfect score or a load time of a few hundred milliseconds, always test your site with your own eyes.

2. Chrome Developer Tools

Google Chrome Developer Tools includes several handy tools for auditing a website. Open it with Ctrl+Shift+I or Ctrl+Opt+J.

2.1 Network Monitor

The Network monitor shows every request the browser makes, plus its response and timings.

• Status – easy to see if any resource is unavailable.
• Protocol – checks HTTP/1.1, HTTP/2, QUIC, and similar.
• Type – the file type returned, which makes it easy to confirm WebP is working.
• Size – the amount of data transferred, with and without Gzip. “Disk Cache” or “Memory Cache” shows browser caching is working.
• Priority – the priority of each file the browser requests. CSS, JS, and fonts have high priority. Images are low. SendBeacon (Google Analytics) and prefetch (WP Rocket) are lowest.
• Waterfall – a waterfall of the data requested and received, with detail on DNS lookup, TCP connection, SSL, TTFB, and more. It also makes lazy loading easy to debug.

2.2 Lighthouse

Lighthouse tests your site for performance, accessibility, best practices, and SEO. You can also choose the device and throttle network speed and CPU. You can use the Lighthouse tool below to get the same results.

2.3 Security – How does security relate to performance?

The TLS version can dramatically affect TTFB. The latest version is TLS 1.3.

3. Google PageSpeed Insights

Google PageSpeed Insights is one of my favorite tools. Instead of only focusing on load time, it measures user experience up to a point.

Some people complain that it does not show fully loaded time. I believe Google leaves it out because it is not a good way to measure a site. PageSpeed Insights is one of the best tools to analyze:

• TTFB – Time to First Byte (server response time)
• FCP – First Contentful Paint
• LCP – Largest Contentful Paint
• TTI – Time to Interactive

and more.

4. GTmetrix Analyzer

GTmetrix analyzes your site and recommends what needs fixing. It also gives scores and fully loaded time. You can choose the test region, device, browser, and more. Its waterfall of all requests is very useful.

Most people focus on scores and fully loaded time. The factors I mainly look at are in the Timings tab.

5. GTmetrix Monitor

GTmetrix also offers a monitor that checks your site periodically and sends a weekly digest. That saves me from re-analyzing the site every time I update something. Its free Basic plan covers 3 URLs to monitor.

6. Pingdom Speed Test

Pingdom Speed Test is a tool from SolarWinds. It is very similar to GTmetrix, with a report, scores, and load time. What I like about it is the breakdown of size and number of requests per domain and file type. That gives a quick view of where to optimize.

7. Pingdom Monitoring

What if your server goes down occasionally, or your site is unreachable for some users under heavy traffic? Pingdom is a website performance and availability monitoring company. Its monitor checks continuously, for example every 5 minutes or 30 seconds, and alerts you if something goes wrong. There is no free plan. Paid plans start at $14.95/month.

8. WebPageTest

WebPageTest is one of the oldest and most reliable tools. Test your website multiple times from the same device. It is very useful for seeing how effectively browser caching works. It also reports key metrics like TTFB, keep-alive, compression, browser caching, and CDN use. I am not a big fan of its UI, so I do not use it that often.

9. KeyCDN Performance Test

Most tools above test TTFB from a single location. KeyCDN Performance Test analyzes your site from 10 locations with one click. It reports DNS lookup time, connection, TLS, and TTFB.

10. Uptime Robot

Like Pingdom Monitoring, Uptime Robot monitors your site for downtime and alerts you. The free plan allows 5-minute monitoring intervals. It is highly recommended to monitor your hosting or server, especially on shared hosting.

11. Google Analytics Site Speed

Google Analytics used the HTML5 Navigation Timing API to collect performance metrics from a sample of your users in Universal Analytics, under Behaviour > Site Speed. Universal Analytics has since been replaced by Google Analytics 4, so check the current Analytics reporting for performance data.

What makes GA Site Speed special is that its data comes from real-world use. Other tools use a high-performance network or an emulated network, which may differ from real users. What if most of your users are still on 3G?

12. Loader.io

What if one of your blog posts goes viral? Are you sure your server or hosting provider could handle it? You might lose users and hurt SEO without knowing it.

Do not assume traffic is unlimited. Run a load test and find out how many visitors you can handle. Loader.io makes it easy to send up to 10,000 clients per test on its free plan to your site and see how it performs.

13. dotcom-tools

dotcom-tools tests your site from multiple locations. I also use it to prebuild CDN cache after a purge.

14. Lighthouse

Lighthouse is another tool from Google, built inside Google Chrome. It tests Performance, Accessibility, Best Practices, and SEO. Its Performance report matches Google PageSpeed Insights, but in one tool you can test all of them.

You can test it directly from your Chrome browser’s Lighthouse panel in Developer Tools, or go to https://web.dev/measure

What to do with the results

Once you have numbers, the next step is knowing what they mean and what to fix. For Core Web Vitals claims, see my Core Web Vitals 2026 myth-bust. For slow responses to clicks and taps, see my INP pillar. And if a slow tool result points to caching, see my best WordPress cache plugins review.

Common Questions

Frequently Asked Questions

Clear, honest answers about speed test tools, scores, and what to fix first.