kozen.or.jp
Data from Aug 21, 2026, 3:03 AM UTC — 16h old.
Built Awesome · 1 measurement · since Aug 21, 2026 · last attempt 16h
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 | 11.20 s | — | — | 11.20 s | 11.20 s | |
| CLS Cumulative Layout Shift | 0 | — | — | 0 | 0 | |
| TBT Total Blocking Time | 178 ms | — | — | 178 ms | 178 ms | |
| FCP First Contentful Paint | 4.64 s | — | — | 4.64 s | 4.64 s | |
| Speed Index | 6.04 s | — | — | 6.04 s | 6.04 s | |
| TTFB Time to First Byte | 805 ms | — | — | 805 ms | 805 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.
Page weight
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| Page Weight | 1.88 MB | — | — | 1.88 MB | 1.88 MB | |
| Requests | 31 | — | — | 31 | 31 | |
| Third-party Weight | 1.40 MB | — | — | 1.40 MB | 1.40 MB | |
| Third-party CPU | 54 ms | — | — | 54 ms | 54 ms | |
| Unused JS | 93.7 kB | — | — | 93.7 kB | 93.7 kB | |
| Unused CSS | 41.0 kB | — | — | 41.0 kB | 41.0 kB |
By resource type
Third parties 4 entities
1.40 MB transferred, 54 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 | 974 ms | — | — | 974 ms | 974 ms | |
| Long Tasks | 3 | — | — | 3 | 3 | |
| DOM Elements | 355 | — | — | 355 | 355 | |
| Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset | 20 | — | — | 20 | 20 | |
| A11y Failures | 2 | — | — | 2 | 2 | |
| A11y Failing Nodes | 18 | — | — | 18 | 18 |
Main thread work
Axe violations axe-core 4.13.0, full rule set
20 violating nodes across 4 rules, 463 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
link-name— Links must have discernible text 11 nodes -
serious
color-contrast— Elements must meet minimum color contrast ratio thresholds 7 nodes -
minor
empty-heading— Headings should not be empty 1 node -
moderate
landmark-unique— Landmarks should have a unique role or role/label/title (i.e. accessible name) combination 1 node
Accessibility failures 2 of 23 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.
-
link-name— Links do not have a discernible name 11 nodes -
color-contrast— Background and foreground colors do not have a sufficient contrast ratio. 7 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, 3:03 AM UTC | 59 | 11.20 s | 0 | 178 ms | 1.88 MB | 3/3 | ±12 | 2,463 | 39.8s |
Embed this score
Live below, then the markup that produces it. Drop that on any page to show
kozen.or.jp'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://kozen.or.jp/"></speedlify-score>