What goes into the score
The assessment is based on several layers:
- server response, for example via TTFB
- visible page build-up, for example via FCP and LCP
- browser runtime, for example via TBT
- layout stability, for example via CLS
- requests and payload size
- caching, images, assets and technical delivery
- further WordPress and front-end signals that become visible in the report
The important part: it is not one number that counts, but a combination of metrics, runtime and detected bottlenecks.
Score bands
In the product, score values are divided into four bands:
| Value | Band | Meaning |
|---|---|---|
| 90–100 | Very good | Technically very solid. Individual bottlenecks are still worth keeping an eye on. |
| 75–89 | Good | Well set up overall. Check individual bottlenecks and recommendations. |
| 60–74 | Room for improvement | Clearly visible bottlenecks in load time, rendering or delivery. |
| 0–59 | Critical | Several problems are slowing the page down noticeably. Prioritised measures make sense. |
You will find these bands in scan and report views as well as in alerts and domain overviews.
Building blocks of the sub-scores
The overall score is made up of several sub-areas:
Speed
Measures server response, visible page build-up and browser runtime. The important signals are TTFB, FCP, LCP and TBT.
Images
Assesses image optimisation, formats (WebP, AVIF), missing dimensions and lazy loading.
Caching
Checks HTTP cache headers, whether static resources are cached sensibly and whether the server responds quickly.
Frontend
Blocking scripts, DOM size and the resource breakdown show how much JavaScript and CSS slow down the page build-up and how much unnecessary load is transferred.
Fonts
Fonts directly affect how visible text builds up. Outdated formats such as TTF or EOT, missing WOFF2 variants, a missing font-display and large font files all feed into this sub-score.
WordPress
WordPress-specific checks: active plugins, theme quality, known bottlenecks from the WordPress ecosystem.
How to read the score
A single score value is a starting point, not a verdict. Only in combination with the sub-areas, bottlenecks and problems does it become clear why a page has that value.
Why the score alone is not enough
A similar overall score can have very different causes. That is why these parts of the report are often particularly important:
- the score breakdown
- the biggest bottlenecks
- problems
- recommendations
- baseline and comparison
They help you understand the direction of a problem instead of just judging the number.
Why values can fluctuate
Results can change because of:
- region and chosen location
- differences between mobile and desktop
- time of day and load
- cache state
- third-party scripts
- CDN, WAF or bot protection
- dynamic content
That is why a single scan is always just a snapshot.
Why repeated scans matter so much
Only repeated or scheduled scans show whether a page stays reliably fast or just happened to catch a good or a bad moment.
That is exactly why history, baseline and alerts are often more important for real work than a single scan without context.
What the score is and what it is not
What it is
A technical assessment that makes bottlenecks visible, helps prioritise measures and makes changes over time understandable.
What it is not
Not an SEO ranking, not a guarantee and no substitute for looking at problems, recommendations and history.
Google PageSpeed score
Every scan additionally shows a Google PageSpeed score for mobile and desktop. This value comes from the Google PageSpeed Insights API and is based on Google Lighthouse — it is fetched independently of the turbometrics score and is visible in the scan report on the details tab.
| Value | Band (Google PSI) |
|---|---|
| ≥ 90 | Very performant |
| 50–89 | Room for optimisation |
| < 50 | Slow — action needed |
The Google PageSpeed score complements the turbometrics score. Both measure synthetically under lab conditions, but they weight things differently. Differences between the two values are normal and not a contradiction — they shed light on similar aspects from different perspectives.