WPInsightful Audit Suite

Website Speed Checker

Measure Lighthouse performance and reveal the improvements that matter most.

Private report

Enter any public HTTP or HTTPS website. Private network addresses are blocked.

Test experience
Report preview

Your audit results will appear here

Start the test above to generate scores, measurements, recommendations, and a downloadable report.

Ready to test
—Grade
—Overall score
—Critical
—Warnings
—Passed
—First Contentful Paint
—Largest Contentful Paint
—Total Blocking Time
—Cumulative Layout Shift

Website Speed Checker Guide

How our website speed checker helps

A website speed checker shows how quickly a page loads and becomes usable under a controlled mobile or desktop simulation. The private report explains what was detected, why it matters and how to verify each correction.

What the speed test measures

The report evaluates Lighthouse performance data and key loading milestones, including visual rendering, responsiveness and layout stability. It also highlights resources or page behavior that may delay the visitor experience.

Understanding the performance score

The score summarizes automated lab measurements from the selected device profile. Use the individual measurements and opportunities alongside the overall score because one number cannot explain every real visitor experience.

How to improve website speed

Start with high-impact recommendations such as optimizing large images, reducing render-blocking resources, limiting unnecessary scripts and improving server response time. Test again after each meaningful change.

Frequently asked questions

Why can a speed test take up to a minute?

The service loads your page in a real test browser, simulates the selected device, measures rendering and calculates the final Lighthouse report.

Can I test more than one page?

Yes. Run a separate audit for every important public page because templates, content and resources can produce different findings.

Explore related website checks

Use the SEO checker, website speed checker and website accessibility checker together for a broader view of page quality.

Get more value from the speed checker

Use the guidance below to prepare the page, interpret the results and build a repeatable improvement process.

Preparing for an accurate speed test

Test the final public HTTPS URL in a logged-out state and avoid making deployments while the measurement is running. Select mobile when most visitors use phones or when you want the more demanding simulation. Select desktop when that environment represents the intended experience. Running the website speed checker more than once can help distinguish a repeatable bottleneck from a temporary network or server variation.

How lab data differs from real users

The speed checker uses a controlled Lighthouse environment so pages can be compared consistently. Real visitors use different devices, locations, networks and cached resources. Field data describes those actual visits over time, while this report provides an immediate diagnostic snapshot. Use both when available: lab data is helpful for debugging, and field data shows whether real experiences meet performance targets.

A practical optimization order

Start with server response and the largest visible content because delays there affect everything that follows. Compress and correctly size images, preload only essential resources, remove unused scripts and styles, and defer noncritical third-party code. Protect layout space for images, advertisements and embeds to reduce movement. After each change, clear caches and use the speed checker again before adding another optimization.

Why scores can change

Performance results can vary when hosting load, remote fonts, advertising, analytics or third-party services respond differently. A plugin update or content edit can also change the page weight and execution cost. Look for trends across several tests instead of treating one score as permanent. The goal is a consistently responsive experience, not merely a single perfect number.

Build performance into every release

Set a small performance budget for page weight, image size and third-party scripts before development begins. Test representative templates on mobile and desktop, not only the homepage. Monitor hosting response, caching behavior and Core Web Vitals after deployment, especially when analytics, advertising or marketing tools change. Keeping a history of speed checker results helps the team spot regressions early and connect them to a release. Consistent performance work is usually safer and more effective than occasional emergency optimization.