uncenter.dev
Data from Aug 21, 2026, 9:47 AM UTC — 9h old.
Built Awesome · 1 measurement · since Aug 21, 2026 · last attempt 9h
Stack
Detected on the same page load as the accessibility pass — the generator
from <meta name="generator"> or the shape of the page,
the host from response headers.
Core Web Vitals field data, origin-level
Real Chrome users, 28-day window (2026-07-19 → 2026-08-15). From the backfilled CrUX history rather than this measurement, which predates the API key. This is what Google measures you on.
Scores
Lab metrics Lighthouse, mobile
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| LCP Largest Contentful Paint | 1.70 s | — | — | 1.70 s | 1.70 s | |
| CLS Cumulative Layout Shift | 0 | — | — | 0 | 0 | |
| TBT Total Blocking Time | 0 ms | — | — | 0 ms | 0 ms | |
| FCP First Contentful Paint | 1.55 s | — | — | 1.55 s | 1.55 s | |
| Speed Index | 1.55 s | — | — | 1.55 s | 1.55 s | |
| TTFB Time to First Byte | 474 ms | — | — | 474 ms | 474 ms |
What LCP is made of
A flat LCP number tells you something regressed. The subparts tell you whether it was the server, resource discovery, the download, or rendering.
Field history 25 weeks
Weekly p75 from the CrUX History API, backfilled in a single request.
| Week ending | LCP | INP | CLS | FCP | TTFB |
|---|---|---|---|---|---|
| 2026-08-15 | — | — | — | — | — |
| 2026-08-08 | — | — | — | — | — |
| 2026-08-01 | — | — | — | — | — |
| 2026-07-25 | — | — | — | — | — |
| 2026-07-18 | — | — | — | — | — |
| 2026-07-11 | — | — | — | — | — |
| 2026-07-04 | — | — | — | — | — |
| 2026-06-27 | — | — | — | — | — |
| 2026-06-20 | — | — | — | — | — |
| 2026-06-13 | — | — | — | — | — |
| 2026-06-06 | — | — | — | — | — |
| 2026-05-30 | — | — | — | — | — |
Page weight
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| Page Weight | 131.7 kB | — | — | 131.7 kB | 131.7 kB | |
| Requests | 13 | — | — | 13 | 13 | |
| Third-party Weight | 11.5 kB | — | — | 11.5 kB | 11.5 kB | |
| Third-party CPU | 3 ms | — | — | 3 ms | 3 ms | |
| Unused JS | 0 B | — | — | 0 B | 0 B | |
| Unused CSS | 0 B | — | — | 0 B | 0 B |
By resource type
Third parties 1 entities
11.5 kB transferred, 3 ms of main thread time. This is the number most likely to regress without anyone on your team shipping anything.
Page health
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| Main Thread Work | 212 ms | — | — | 212 ms | 212 ms | |
| Long Tasks | 0 | — | — | 0 | 0 | |
| DOM Elements | 67 | — | — | 67 | 67 | |
| Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset | 15 | — | — | 15 | 15 | |
| A11y Failures | 1 | — | — | 1 | 1 | |
| A11y Failing Nodes | 15 | — | — | 15 | 15 |
Main thread work
Axe violations axe-core 4.13.0, full rule set
15 violating nodes across 1 rule, 205 passing. This is a standalone axe run, stricter than the subset Lighthouse folds into its score above — and it is the second tiebreaker in the ranking.
-
serious
color-contrast— Elements must meet minimum color contrast ratio thresholds 15 nodes
Accessibility failures 1 of 25 audits
Tracked as a count, not just the score — the weighted score is coarse enough that you can ship a broken component and barely move it.
-
color-contrast— Background and foreground colors do not have a sufficient contrast ratio. 15 nodes
Hygiene
Changes rarely — which is exactly why a change is worth noticing.
Measurement log
Every stored run for this URL, newest first. Failures are kept as records — "this site was down on Tuesday" is data too.
| When | Perf | LCP | CLS | TBT | Weight | Runs | Spread | Bench | Took |
|---|---|---|---|---|---|---|---|---|---|
| Aug 21, 2026, 9:47 AM UTC | 99 | 1.70 s | 0 | 0 ms | 131.7 kB | 3/3 | ±4 | 2,291 | 22s |
Embed this score
Live below, then the markup that produces it. Drop that on any page to show
uncenter.dev's scores, updated whenever this instance
re-measures — more about the component. Don’t forget to bundle the speedlify-score.js component code into your site!
<speedlify-score speedlify-url="https://zachleat.github.io/speedlify2/" url="https://uncenter.dev/"></speedlify-score>