openai.com
Data from Aug 31, 2026, 9:07 PM UTC old
Overall #1,144 AI #2 Developer Tooling #40 · 1 measurement · since Aug 31, 2026
Stack
Core Web Vitals field data, url-level
Real Chrome users, 28-day window (2026-08-02 → 2026-08-29).
Lighthouse Scores
Filmstrip Lighthouse, mobile
How the page drew during the measured load, at 8 points across 43.74 s.
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5.47 s
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10.94 s
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16.40 s
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21.87 s
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27.34 s
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32.81 s
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38.28 s
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43.74 s
Without JavaScript
The same load, photographed twice at 412×823: once with scripts disabled, once as rendered.
0.1% of pixels differ — they are nearly identical. A shifted layout counts as difference, so a <noscript> banner alone can account for a large figure.
Lab metrics Lighthouse, mobile
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| LCP Largest Contentful Paint | 66.32 s | — | — | 66.32 s | 66.32 s | |
| CLS Cumulative Layout Shift | 0 | — | — | 0 | 0 | |
| TBT Total Blocking Time | 1.97 s | — | — | 1.97 s | 1.97 s | |
| FCP First Contentful Paint | 4.04 s | — | — | 4.04 s | 4.04 s | |
| Speed Index | 12.93 s | — | — | 12.93 s | 12.93 s | |
| TTFB Time to First Byte | 736 ms | — | — | 736 ms | 736 ms |
LCP Subparts lab observed, unthrottled
The subparts attribute LCP to your server, resource discovery, download, or rendering. Note that the Lab metrics LCP metric shown above is throttled.
Field data Chrome UX Report, url-level
Real Chrome users, 28-day trailing window (2026-08-02 → 2026-08-29).
| Metric | p75 | Rating | Distribution (good / needs work / poor) |
|---|---|---|---|
| LCP CWV | 3.15 s | needs-improvement | 64.2% good |
| INP CWV Interaction to Next Paint — field only, Lighthouse cannot measure this in a lab run | 461 ms | needs-improvement | 55.7% good |
| CLS CWV | 0 | good | 98.9% good |
| FCP | 2.45 s | needs-improvement | 61.5% good |
| TTFB | 1.12 s | needs-improvement | 62.6% good |
Lab LCP vs Field LCP
The lab LCP is 21.05× the field p75 — real users likely have above-average hardware or network connectivity.
Field history 25 weeks
Weekly p75 from the CrUX History API, backfilled in a single request.
| Week ending | LCP | INP | CLS | FCP | TTFB |
|---|---|---|---|---|---|
| 2026-08-29 | 3.15 s | 461 ms | 0 | 2.45 s | 1.12 s |
| 2026-08-22 | 3.17 s | 481 ms | 0 | 2.46 s | 1.10 s |
| 2026-08-15 | 3.14 s | 500 ms | 0 | 2.43 s | 1.03 s |
| 2026-08-08 | 3.16 s | 505 ms | 0 | 2.45 s | 1.06 s |
| 2026-08-01 | 3.09 s | 501 ms | 0 | 2.46 s | 1.11 s |
| 2026-07-25 | 2.92 s | 493 ms | 0 | 2.41 s | 1.12 s |
| 2026-07-18 | 2.80 s | 473 ms | 0 | 2.39 s | 1.14 s |
| 2026-07-11 | 2.65 s | 446 ms | 0 | 2.33 s | 1.12 s |
| 2026-07-04 | 2.60 s | 432 ms | 0 | 2.29 s | 1.10 s |
| 2026-06-27 | 2.66 s | 426 ms | 0 | 2.32 s | 1.11 s |
| 2026-06-20 | 2.68 s | 410 ms | 0 | 2.31 s | 1.11 s |
| 2026-06-13 | 2.71 s | 397 ms | 0 | 2.32 s | 1.10 s |
Page weight
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| Page Weight | 16.68 MB | — | — | 16.68 MB | 16.68 MB | |
| Requests | 187 | — | — | 187 | 187 | |
| Third-party Weight | 193 kB | — | — | 193 kB | 193 kB | |
| Third-party CPU | 20 ms | — | — | 20 ms | 20 ms | |
| Unused JS | 2.45 MB | — | — | 2.45 MB | 2.45 MB | |
| Unused CSS | 33.4 kB | — | — | 33.4 kB | 33.4 kB |
By resource type
- image 51% 8.51 MB · 8 req
- media 23.8% 3.96 MB · 4 req
- script 22.2% 3.70 MB · 95 req
- stylesheet 1% 170 kB · 27 req
- font 1% 167 kB · 3 req
- other 0.8% 134 kB · 49 req
- document 0.3% 44.1 kB · 1 req
Third parties 5 entities
193 kB transferred, 20 ms on the main thread.
Page health
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| Main Thread Work | 7.67 s | — | — | 7.67 s | 7.67 s | |
| Long Tasks | 20 | — | — | 20 | 20 | |
| DOM Elements | 805 | — | — | 805 | 805 | |
| Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) | 0 | — | — | 0 | 0 | |
| A11y Failures | 1 | — | — | 1 | 1 | |
| A11y Failing Nodes | 20 | — | — | 20 | 20 |
Main thread work
Axe violations axe-core 4.13.0, full rule set
0 violating nodes across 0 rules, 1614 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.
Accessibility failures 1 of 28 audits
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label-content-name-mismatch— Elements with visible text labels do not have matching accessible names. 20 nodes
Hygiene
Measurement log
Every stored run for this URL, newest first.
| When | Perf | LCP | CLS | TBT | Weight | Runs | Spread | Bench | Took |
|---|---|---|---|---|---|---|---|---|---|
| Aug 31, 2026, 9:07 PM UTC | 30 | 66.32 s | 0 | 1.97 s | 16.68 MB | 3/3 | ±1 | 2,468 0% | 207s |