v8.dev
Data from Aug 21, 2026, 10:29 AM UTC 2d old
Built Awesome #365 · 1 measurement · since Aug 21, 2026
Core Web Vitals field data, url-level
Real Chrome users, 28-day window (2026-07-23 → 2026-08-19). This is what Google measures you on.
Scores
Lab metrics Lighthouse, mobile
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| LCP Largest Contentful Paint | 769 ms | — | — | 769 ms | 769 ms | |
| CLS Cumulative Layout Shift | 0 | — | — | 0 | 0 | |
| TBT Total Blocking Time | 0 ms | — | — | 0 ms | 0 ms | |
| FCP First Contentful Paint | 769 ms | — | — | 769 ms | 769 ms | |
| Speed Index | 769 ms | — | — | 769 ms | 769 ms | |
| TTFB Time to First Byte | 602 ms | — | — | 602 ms | 602 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 769 ms 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 data Chrome UX Report, url-level
Real Chrome users, 28-day trailing window (2026-07-23 → 2026-08-19). This is what Google measures you on.
| Metric | p75 | Rating | Distribution (good / needs work / poor) |
|---|---|---|---|
| LCP CWV | 962 ms | good | 94.9% good |
| INP CWV Interaction to Next Paint — field only, Lighthouse cannot measure this in a lab run | 80 ms | good | 94.8% good |
| CLS CWV | 0 | good | 95.7% good |
| FCP | 973 ms | good | 91% good |
| TTFB | 645 ms | good | 79.5% good |
Lab vs field
Lab LCP 769 ms · field p75 962 ms · real users are 1.25× slower than the lab.
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 | 970 ms | 82 ms | 0 | 977 ms | 648 ms |
| 2026-08-08 | 937 ms | 82 ms | 0 | 936 ms | 630 ms |
| 2026-08-01 | 893 ms | 87 ms | 0 | 898 ms | 572 ms |
| 2026-07-25 | 893 ms | 84 ms | 0 | 896 ms | 573 ms |
| 2026-07-18 | 887 ms | 84 ms | 0 | 896 ms | 582 ms |
| 2026-07-11 | 859 ms | 84 ms | 0 | 880 ms | 558 ms |
| 2026-07-04 | 872 ms | 79 ms | 0 | 900 ms | 603 ms |
| 2026-06-27 | 861 ms | 77 ms | 0 | 871 ms | 585 ms |
| 2026-06-20 | 851 ms | 74 ms | 0 | 866 ms | 570 ms |
| 2026-06-13 | 862 ms | 70 ms | 0 | 866 ms | 614 ms |
| 2026-06-06 | 841 ms | 73 ms | 0 | 848 ms | 612 ms |
| 2026-05-30 | 850 ms | 73 ms | 0 | 870 ms | 567 ms |
Page weight
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| Page Weight | 17.3 kB | — | — | 17.3 kB | 17.3 kB | |
| Requests | 9 | — | — | 9 | 9 | |
| Third-party Weight | 0 B | — | — | 0 B | 0 B | |
| Third-party CPU | 0 ms | — | — | 0 ms | 0 ms | |
| Unused JS | 0 B | — | — | 0 B | 0 B | |
| Unused CSS | 0 B | — | — | 0 B | 0 B |
By resource type
Page health
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| Main Thread Work | 175 ms | — | — | 175 ms | 175 ms | |
| Long Tasks | 0 | — | — | 0 | 0 | |
| DOM Elements | 103 | — | — | 103 | 103 | |
| Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset | 1 | — | — | 1 | 1 | |
| A11y Failures | 0 | — | — | 0 | 0 | |
| A11y Failing Nodes | 0 | — | — | 0 | 0 |
Main thread work
Axe violations axe-core 4.13.0, full rule set
1 violating node across 1 rule, 215 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
empty-heading— Headings should not be empty 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, 10:29 AM UTC | 100 | 769 ms | 0 | 0 ms | 17.3 kB | 3/3 | ±0 | 2,471 | 20.1s |
Embed this score
Live below, then the markup that produces it. Drop that on any page to show
v8.dev'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://v8.dev/"></speedlify2-score>