How to Read a PageSpeed Report in Five Minutes
Four scores, five timings and the order to read them in, next to real reports you can open.
By Julia Profit Studio Published Updated 5 min read
We measured ten of our demo sites on Google PageSpeed Insights in September and October 2026, and all ten score 100 / 100 / 100 / 100 on a phone [1]. A score like that is easy to quote and easy to misread. This guide shows what a PageSpeed report contains, which line to read first, and what the numbers look like in our own saved reports, so you can read yours the same way.
Run the test twice: mobile and desktop
Open Google PageSpeed Insights, paste your website address and press Analyze. The report has two tabs at the top, Mobile and Desktop, and each one is a separate test with its own scores.
Read Mobile first. The mobile test loads your page the way a mid-range phone on a slow connection would: our saved Tannin Creek report lists the setup as an emulated Moto G Power with Slow 4G throttling [2]. The desktop test runs without that handicap. A site that looks fine on your office computer can still fail on the phone a customer holds in a parking lot.
If you want both reports without typing the address twice, our check page opens them for any address you enter. Nothing you type there is sent to us.
The four scores at the top
Each score runs from 0 to 100, and the report colors it: 0 to 49 is red, 50 to 89 is orange, 90 to 100 is green. The bands are printed in the report itself, under the Performance score [2].
| Score | What it checks | What you want |
|---|---|---|
| Performance | How fast the page becomes usable | 90 or above; we aim for 100 |
| Accessibility | Whether the page works with a screen reader, a keyboard and high contrast | 90 or above; we aim for 100 |
| Best Practices | Safe, modern code: a secure connection, correct image sizes, no known weak libraries | 90 or above; we aim for 100 |
| SEO | Whether search engines can read the page: titles, descriptions, links, a phone-sized layout | 90 or above; we aim for 100 |
Performance is the one people quote, and it is the only one of the four that is built from timings: the report says so under the score, “The performance score is calculated directly from these metrics” [2]. The other three are lists of checks that a page passes or fails. So Performance is the score that can move between two runs of the same page.
The five timings under the scores
Under the Performance score the report lists five measurements. They explain the score.
- First Contentful Paint (FCP): when the first text or image appears.
- Largest Contentful Paint (LCP): when the main content appears. Our target is under 2.5 seconds.
- Total Blocking Time (TBT): how long the page is frozen and ignores taps. Our target is 0 ms.
- Cumulative Layout Shift (CLS): how much the page jumps while it loads. Our target is 0.
- Speed Index: how quickly the visible part of the page fills in.
Here is what those five look like on a phone for each of our ten demo sites. Each one is a demo site for an invented company, and each report is saved and public [1].
| Demo site, date measured | FCP | LCP | TBT | CLS | Speed Index |
|---|---|---|---|---|---|
| Sunridge Pressure Washing, September 10, 2026 | 0.9 s | 1.8 s | 0 ms | 0 | 0.9 s |
| Tannin Creek Landscape Co., September 27, 2026 | 1.0 s | 1.7 s | 0 ms | 0 | 1.0 s |
| Caliche Ridge Roofing, September 27, 2026 | 1.1 s | 1.5 s | 0 ms | 0.002 | 1.1 s |
| Copperfield Air, September 27, 2026 | 1.0 s | 1.6 s | 0 ms | 0 | 1.0 s |
| Vale Auto Detailing, October 15, 2026 | 1.3 s | 1.6 s | 0 ms | 0 | 1.3 s |
| Halcyon Pest Solutions, October 20, 2026 | 1.1 s | 1.2 s | 0 ms | 0 | 1.1 s |
| Pearlfern Aesthetics, October 19, 2026 | 1.0 s | 1.3 s | 0 ms | 0 | 1.0 s |
| Northbend Family Dental, October 21, 2026 | 1.0 s | 1.4 s | 0 ms | 0 | 1.0 s |
| Farcross Immigration Law, October 22, 2026 | 1.0 s | 1.5 s | 0 ms | 0 | 1.0 s |
| Tidewren Creamery, October 22, 2026 | 1.1 s | 1.4 s | 0 ms | 0 | 1.1 s |
Two things in that table are worth a second look. Caliche Ridge’s layout moves by 0.002 while it loads, and the page still scores 100: a perfect score does not mean every timing is zero. And all ten sites show their main content in under 2 seconds on the throttled phone test, well inside the 2.5-second target.
Run it twice before you act
The timings come from one test run, and a run is one moment on one connection. On September 27, 2026 we tested Tannin Creek twice, twenty minutes apart. The first run measured Speed Index at 1.0 s and the second at 2.2 s [2][3]. Both runs scored 100 on all four scores.
So before you decide a page is slow, run the test again. If the number stays red on the second run, it is real. If it jumps back to green, the first run caught a slow moment, not a slow site.
Read past the scores
Below the timings, the report lists Insights and Diagnostics: specific things on the page that cost time or bytes. They are worth reading even when the score is 100. Our saved Tannin Creek report scores 100 on mobile and still lists “Improve image delivery” with an estimated saving of 173 KiB [2]. The score says the page is fast enough. The list says what could still be lighter.
A five-minute routine
- Paste your address into PageSpeed Insights and press Analyze.
- On the Mobile tab, write down the four scores.
- Write down LCP, TBT and CLS, and compare them with the targets above.
- Switch to Desktop and do the same.
- Press Copy Link at the top of the report and keep the address, so you can compare the next run with this one.
If a mobile score is red on two runs, start with the timing that misses its target. That is the one the page is losing points on.
What to take away
A PageSpeed report is two tests, four scores and five timings. Read the mobile Performance score first, then LCP, TBT and CLS. Run it twice before you act on a single number.
Sources
- PageSpeed Insights reports for Sunridge Pressure Washing (saved September 10, 2026), Tannin Creek Landscape Co., Caliche Ridge Roofing and Copperfield Air (saved September 27, 2026), Vale Auto Detailing (saved October 15, 2026), Halcyon Pest Solutions (saved October 20, 2026), Pearlfern Aesthetics (saved October 19, 2026), Northbend Family Dental (saved October 21, 2026), Farcross Immigration Law and Tidewren Creamery (saved October 22, 2026). Links on our Work page.
- PageSpeed Insights report for Tannin Creek Landscape Co., saved September 27, 2026, 5:46 AM ET, mobile tab.
- A second PageSpeed Insights run on Tannin Creek Landscape Co., September 27, 2026, 6:06 AM ET, saved report ID uu3jd43tfo.
Five of these demos were renamed on November 2, 2026. The reports above were run before that, under their earlier names and addresses.