open-wc.org
Data from Aug 21, 2026, 5:37 AM UTC 2d old
11ty Emeritus · 1 measurement · since Aug 21, 2026
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.
Scores
Lab metrics Lighthouse, mobile
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| LCP Largest Contentful Paint | 2.83 s | — | — | 2.83 s | 2.83 s | |
| CLS Cumulative Layout Shift | 0.122 | — | — | 0.122 | 0.122 | |
| TBT Total Blocking Time | 67 ms | — | — | 67 ms | 67 ms | |
| FCP First Contentful Paint | 2.60 s | — | — | 2.60 s | 2.60 s | |
| Speed Index | 2.60 s | — | — | 2.60 s | 2.60 s | |
| TTFB Time to First Byte | 629 ms | — | — | 629 ms | 629 ms |
What LCP is made of observed, unthrottled
A flat LCP number tells you something regressed. The subparts tell you whether it was the server, resource discovery, the download, or rendering.
Measured on the trace before throttling is modelled, so these are real durations that will not sum to the 2.83 s above — that figure is a simulation of the same load on a slow phone and connection. Read these for the proportions: which phase dominates.
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 | 19.24 MB | — | — | 19.24 MB | 19.24 MB | |
| Requests | 107 | — | — | 107 | 107 | |
| Third-party Weight | 19.09 MB | — | — | 19.09 MB | 19.09 MB | |
| Third-party CPU | 85 ms | — | — | 85 ms | 85 ms | |
| Unused JS | 161 kB | — | — | 161 kB | 161 kB | |
| Unused CSS | 0 B | — | — | 0 B | 0 B |
By resource type
Third parties 6 entities
19.09 MB transferred, 85 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 | 1.46 s | — | — | 1.46 s | 1.46 s | |
| Long Tasks | 4 | — | — | 4 | 4 | |
| DOM Elements | 327 | — | — | 327 | 327 | |
| Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset | 3 | — | — | 3 | 3 | |
| A11y Failures | 0 | — | — | 0 | 0 | |
| A11y Failing Nodes | 0 | — | — | 0 | 0 |
Main thread work
Axe violations axe-core 4.13.0, full rule set
3 violating nodes across 2 rules, 745 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.
-
minor
aria-allowed-role— ARIA role should be appropriate for the element 2 nodes -
moderate
landmark-unique— Landmarks should have a unique role or role/label/title (i.e. accessible name) combination 1 node
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, 5:37 AM UTC | 87 | 2.83 s | 0.122 | 67 ms | 19.24 MB | 3/3 | ±6 | 2,510 | 31s |
Embed this score
Live below, then the markup that produces it. Drop that on any page to show
open-wc.org's scores, updated whenever this instance
re-measures — more about the component. Don’t forget to bundle the speedlify2-score.js component code into your site!
<speedlify2-score speedlify-url="https://www.speedlify.dev/" url="https://open-wc.org/"></speedlify2-score>