Website performance testing
Understand Your Website Performance
Provelex loads each page in a real browser and measures how long it takes to become useful, whether it stays steady and how much it downloads. Results come with an explanation of what the number means and what usually causes it.
What is measured, and the thresholds used
Values are rated against these limits. Where a Core Web Vital applies, the bands follow Google's published "good" and "poor" ranges.
| Measure | What it tells you | Good up to | Poor above |
|---|---|---|---|
| Largest Contentful Paint | When the main content appears | 2.5 s | 4 s |
| First Contentful Paint | When anything at all appears | 1.8 s | 3 s |
| Time to First Byte | How long the server takes to start responding | 0.8 s | 1.8 s |
| Cumulative Layout Shift | How much the page jumps around while loading | 0.1 | 0.25 |
| Long tasks | How long scripts freeze the page | 200 ms | 600 ms |
| Page load | When the page finishes loading | 3 s | 6 s |
| Page weight | How much is downloaded | 1.6 MB | 4 MB |
Provelex also reports pages containing an unusually large number of elements, which slows down everything the browser does.
Comparing runs
In an account, Provelex compares a page with its previous measurement and raises a finding when a value gets noticeably worse. That helps catch a release that slowed something down, which a single measurement cannot show.
Speed test or assessment?
| Free speed test | Assessment | |
|---|---|---|
| Best for | A quick answer about one page | Performance alongside security, accessibility and more |
| Pages | One | Up to 3 on Basic, up to 25 in an account |
| Conditions | A throttled phone profile and desktop | Desktop browser profile, on each page visited |
| Results kept | 24 hours, with a link to share | 30 minutes on Basic, in your account otherwise |
Reading the numbers sensibly
- These are lab measurements. They come from one browser on our server, not from your real visitors, so they vary between runs.
- Real-visitor data is separate. Interaction to Next Paint needs field data, so Provelex does not report it. Use Google PageSpeed Insights or Search Console alongside these results.
- Distance matters. Server response time reflects the route between your server and ours, as well as your server's speed.
- A good score does not guarantee rankings. Performance is one of many factors in search.
Only want to know how fast one page is?
The free speed test measures a page on a throttled phone profile and on desktop, with no account.
Test my page speedRelated pages
Need help with your account or a report? Email provelex@devsapience.com