v8.dev
Ranks Overall #578 Built Awesome #436
Data from Oct 5, 2026, 1:41 AM UTC old Measured once a week · 7 runs since Aug 21, 2026
Elsewhere:
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Scoring Calculator ·
Wayback Machine
Lab data is measured using Lighthouse, Mobile mode unless otherwise specified. Field data is reported from Chrome UX Report (using p75 measurements).
Lighthouse Scores LAB Simulated
Metrics LAB FIELD
Field figures are the p75 across real Chrome users over a 28-day trailing window (2026-09-05 → 2026-10-02), url-level.
| Metric | Lab Simulated | Field | |||
|---|---|---|---|---|---|
| Value | Change / range | Trend | p75 | Distribution | |
| LCP CWV Largest Contentful Paint | 903 ms good | ↑ +137 ms (+17.9%) significant 766 ms – 903 ms | 972 ms good | 94.7% 1.9% 3.4% | |
| INP CWV Interaction to Next Paint — field only, no lab run can measure it | n/a | — | 85 ms good | 91.6% 7.1% 1.3% | |
| CLS CWV Cumulative Layout Shift | 0 good | → no change 0 – 0 | 0 good | 93.9% 4.5% 1.6% | |
| TBT Total Blocking Time | 0 ms good | → no change 0 ms – 0 ms | n/a | — | |
| FCP First Contentful Paint | 766 ms good | → no change 766 ms – 786 ms | 989 ms good | 89.7% 5.8% 4.5% | |
| Speed Index | 766 ms good | → no change 766 ms – 786 ms | n/a | — | |
| TTFB Time to First Byte | 603 ms good | ↓ -1 ms (-0.2%) 602 ms – 619 ms | 613 ms good | 81.1% 12.9% 6% | |
LCP Subparts LAB Unthrottled
The subparts attribute LCP to your server, resource discovery, download, or rendering. Note that the Lab LCP shown above is a simulated throttled estimate.
LCP LAB Simulated vs LCP FIELD
The lab LCP is 0.93× the field p75 — real users likely have similar hardware or network connectivity to the lab test.
Page weight
| Metric | Value | Change / range | Trend |
|---|---|---|---|
| Page Weight | 17.3 kB | ↑ +316 B (+1.9%) 17.0 kB – 17.3 kB | |
| Requests | 9 | → no change 9 – 9 | |
| Third-party Weight | 0 B | → no change 0 B – 0 B | |
| Third-party CPU | 0 ms | → no change 0 ms – 0 ms | |
| Unused JS | 0 B | → no change 0 B – 0 B | |
| Unused CSS | 0 B | → no change 0 B – 0 B |
By resource type
| Type | Transfer | Share | Size | Requests |
|---|---|---|---|---|
| other | 45.1% | 7.8 kB | 3 | |
| script | 17.4% | 3.0 kB | 2 | |
| stylesheet | 17.4% | 3.0 kB | 1 | |
| image | 11.3% | 1.9 kB | 2 | |
| document | 8.8% | 1.5 kB | 1 | |
| Total | 17.3 kB | 9 |
Without JavaScript
The same load, photographed twice at 412×823: once with scripts disabled, once as rendered.
62.1% of pixels differ — the page changes substantially. A shifted layout counts as difference, so a <noscript> banner alone can account for a large figure.
Page health
| Metric | Value | Change / range | Trend |
|---|---|---|---|
| Main Thread Work | 128 ms | ↓ -31 ms (-19.5%) 98 ms – 241 ms | |
| Long Tasks | 0 | → no change 0 – 0 | |
| DOM Elements | 103 | → no change 103 – 103 | |
| Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) | 1 | → no change 1 – 1 | |
| A11y Failures | 0 | → no change 0 – 0 | |
| A11y Failing Nodes | 0 | → no change 0 – 0 |
Main thread work
| Task | Time | Share | Duration Simulated |
|---|---|---|---|
| other | 59% | 75 ms | |
| style layout | 17% | 22 ms | |
| script evaluation | 14% | 18 ms | |
| paint composite render | 5% | 6 ms | |
| parse HTML | 4% | 5 ms | |
| script parse compile | 1% | 1 ms | |
| Total | 128 ms |
Axe violations axe-core 4.13.0, full rule set
1 violating node across 1 rule, 215 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.
-
minor
empty-heading— Headings should not be empty 1 nodeOffending element
-
#header > h1<h1><a href="/">V8</a></h1>
-
Hygiene
Measurement log
Field history 25 weeks
Weekly p75 from the CrUX History API, backfilled in a single request.
| Week ending | LCP | INP | CLS | FCP | TTFB |
|---|---|---|---|---|---|
| 2026-09-26 | 1.00 s | 94 ms | 0 | 1.01 s | 626 ms |
| 2026-09-19 | 1.01 s | 87 ms | 0 | 1.01 s | 626 ms |
| 2026-09-12 | 1.01 s | 89 ms | 0 | 1.01 s | 653 ms |
| 2026-09-05 | 1.00 s | 89 ms | 0 | 1.01 s | 651 ms |
| 2026-08-29 | 981 ms | 79 ms | 0 | 984 ms | 653 ms |
| 2026-08-22 | 964 ms | 82 ms | 0 | 982 ms | 685 ms |
| 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 |
Runs
Every stored run for this URL, newest first.
| When | Scores | Perf | LCP | CLS | TBT | Weight | Runs | Spread | Bench | Took | Archive |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 5, 2026, 1:41 AM UTC | 100 | 903 ms | 0 | 0 ms | 17.3 kB | 3/3 | ±0 | 3,060 +23% | 19s |
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| Sep 27, 2026, 11:45 PM UTC | 100 | 766 ms | 0 | 0 ms | 17.0 kB | 3/3 | ±0 | 3,013 +21% | 19s |
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| Sep 20, 2026, 8:43 PM UTC | 100 | 773 ms | 0 | 0 ms | 17.3 kB | 3/3 | ±0 | 4,272 +72% | 18.6s |
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| Sep 13, 2026, 8:24 PM UTC | 100 | 781 ms | 0 | 0 ms | 17.0 kB | 3/3 | ±0 | 3,190 +28% | 20s |
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| Sep 6, 2026, 6:52 PM UTC | 100 | 774 ms | 0 | 0 ms | 17.3 kB | 3/3 | ±0 | 2,292 -8% | 21.3s |
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| Aug 30, 2026, 5:56 PM UTC | 100 | 786 ms | 0 | 0 ms | 17.0 kB | 3/3 | ±0 | 2,328 -6% | 20.1s |
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| Aug 21, 2026, 10:29 AM UTC | 100 | 769 ms | 0 | 0 ms | 17.3 kB | 3/3 | ±0 | 2,471 -1% | 20.1s |
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Embed this score
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