Domain & Website SEO Tools
Page Speed Checker
In-depth performance report — Core Web Vitals, a visual load timeline, page-weight breakdown and prioritized fixes, powered by Google Lighthouse.
- Free to use
- No sign-up
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About this tool
Run a lab performance test on any public URL using Google's PageSpeed Insights engine (Lighthouse). Choose mobile or desktop and get a performance report with the weight and number of requests for each resource type.
How to use it
- Paste the URL you want to test.
- Pick Mobile or Desktop.
- Run the test and read the report.
What the report shows
- An overall performance score and key loading metrics
- Total transfer weight split by images, scripts, stylesheets, fonts and HTML
- How many requests each resource type needs
Why it matters
Slow loading frustrates visitors, especially on phones and weaker connections, and Google uses real-world loading experience as one of many ranking signals. Fixing the heaviest resources usually brings the biggest gains.
Quick wins
- Compress and resize images, and serve modern formats such as WebP.
- Remove unused JavaScript and CSS, and defer what is not needed straight away.
- Enable browser caching and a CDN.
- Limit third-party widgets, chat bubbles and trackers.
Mobile vs desktop
The mobile test simulates a mid-range phone on a slower network, so its score is usually lower. Prioritise it — most visitors browse on phones.
Limitations
Lab results vary between runs because of server load and network conditions. Run a few tests and compare the trend rather than relying on a single number.
A worked example
A local bakery's homepage scores poorly on mobile. The report shows that images make up 4 MB of the 5 MB total, mostly a single 3,000-pixel hero photo. Resizing it to 1,600 pixels and saving it as WebP cuts the weight to under 1 MB and improves the score noticeably.
Key metrics in plain words
- LCP (Largest Contentful Paint) – when the main content appears; aim for under 2.5 seconds.
- CLS (Cumulative Layout Shift) – how much the layout jumps while loading; aim for under 0.1.
- TBT (Total Blocking Time) – how long scripts block interaction; lower is better.
An improvement plan
- Fix the heaviest resource type first — usually images or scripts.
- Lazy-load images below the fold.
- Set width and height on images and ad slots to prevent layout shifts.
- Remove plugins and trackers you no longer use.
- Re-test after each change to see its impact.
Related tools
- Website Speed Test – measure server response stages
- Page Size Checker – check the HTML document weight
- PageSpeed Insights Checker – another view of Google’s lab data
Step by step: a speed review
- Test the homepage, a typical article and a product or tool page.
- Note the heaviest resource type on each.
- Fix the biggest issue on the most visited page first.
- Re-test the same pages after each change.