speedlify2

Lighthouse lab metrics, Axe, and Chrome UX Report field data for a list of sites recorded and compared over time. Follow us on Mastodon or Bluesky.

Charts Compare Measurement runs Embed a score Open to Work

pptr.dev

https://pptr.dev/

88PERF 84A11Y 96BEST 92SEO ✗AXE ✓CWV

Ranks Overall #1,527 Developer Tooling #59 Test Runners #10

Data from Oct 9, 2026, 10:14 AM UTC old, older than this category's 3 days freshness target Measured every 2 days · 20 runs since Aug 27, 2026

Elsewhere: PageSpeed Insights · Calibre · Treo · CrUX Vis · Tame the Bots · Scoring Calculator · Wayback Machine

This data is old.

Sites are measured on a rolling schedule, so figures here are the newest successful measurement rather than a reading taken just now. Comparisons against other sites may span different points in time.

Lab data is measured using Lighthouse, Mobile mode unless otherwise specified. Field data is reported from Chrome UX Report (using p75 measurements).

Stack

Docusaurus 3.10.2 Built with Docusaurus 3.10.2
Uses ReactReact
GitHub Pages Hosted by GitHub Pages

Filmstrip LAB Throttled

How the page drew during the measured load, at 8 points across 6.07 s. Compare this filmstrip against another site.

  1. 759 ms
  2. 1.52 s
  3. 1.61 s
  4. 3.04 s
  5. 3.79 s
  6. 4.55 s
  7. 5.31 s
  8. 6.07 s

Lighthouse Scores LAB Simulated

88
Performance
↓ -2 (-2.2%)
84
Accessibility
no change
96
Best Practices
↓ -4 (-4%)
92
SEO
no change

Metrics LAB FIELD

Core Web Vitals: passing 3 of 3 assessed from real Chrome users.

Field figures are the p75 across real Chrome users over a 28-day trailing window (2026-09-10 → 2026-10-07), url-level.

Metric Lab Simulated Field
Value Change / range Trend p75 Distribution
LCP CWV Largest Contentful Paint 3.24 s needs work ↑ +60 ms (+1.9%) 1.40 s – 4.90 s 1.77 s good 86.1% 8.2% 5.7%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 192 ms good 76.5% 17% 6.5%
CLS CWV Cumulative Layout Shift 0.064 good → no change 0.012 – 0.175 0.070 good 84.5% 13.9% 1.7%
TBT Total Blocking Time 242 ms needs work ↑ +51 ms (+26.7%) 163 ms – 539 ms n/a —
FCP First Contentful Paint 1.05 s good ↓ -7 ms (-0.7%) 1.05 s – 1.09 s 1.46 s good 84.5% 9.9% 5.6%
Speed Index 1.49 s good ↑ +34 ms (+2.3%) 1.41 s – 1.90 s n/a —
TTFB Time to First Byte 603 ms good ↓ -6 ms (-1%) 602 ms – 625 ms 824 ms needs work 73.7% 20.5% 5.8%

LCP Subparts LAB Throttled

The subparts attribute LCP to your server, resource discovery, download, or rendering. They come from one throttled load, the same one as the filmstrip, so they add up to that load’s LCP rather than the simulated Lab LCP above.

element render delay 1.04 s
time to first byte 566 ms

LCP LAB Simulated vs LCP FIELD

Lab 3.24 s
Field p75 1.77 s

The lab LCP is 1.83× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric Value Change / range Trend
Page Weight 601 kB ↑ +2.6 kB (+0.4%) 579 kB – 601 kB
Requests 26 → no change 26 – 30
Third-party Weight 202 kB ↑ +2.0 kB (+1%) 193 kB – 202 kB
Third-party CPU 38 ms ↑ +2 ms (+5.9%) 30 ms – 50 ms
Unused JS 150 kB ↑ +1.5 kB (+1.1%) 138 kB – 150 kB
Unused CSS 0 B → no change 0 B – 0 B

By resource type

Type Transfer Share Size Requests
script 91% 544 kB 11
stylesheet 4.2% 25.0 kB 1
image 3.7% 21.8 kB 3
document 1.2% 7.1 kB 1
Total 601 kB 26

Third parties 3 entities

Entity Transfer Size Main thread Simulated
Google Tag Manager script 180 kB 38 ms
GitHub 20.6 kB 0 ms
shields.io 1.2 kB 0 ms
Total 202 kB 38 ms

Without JavaScript

The same load, photographed twice at 412×823: once with scripts disabled, once as rendered.

Scripts disabled
As rendered

49.9% of pixels differ — parts of the page change. 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 1.52 s ↑ +242 ms (+18.9%) significant 1.14 s – 2.17 s
Long Tasks 4 ↑ +1 (+33.3%) 3 – 6
DOM Elements 665 → no change 655 – 665
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 45 → no change 45 – 45
A11y Failures 5 → no change 4 – 5
A11y Failing Nodes 45 → no change 44 – 45

Main thread work

Task Time Share Duration Simulated
script evaluation 57% 871 ms
script parse compile 13% 197 ms
other 13% 194 ms
style layout 11% 173 ms
paint composite render 2% 34 ms
garbage collection 2% 29 ms
parse HTML 2% 24 ms
Total 1.52 s

Axe violations axe-core 4.13.0, full rule set

45 violating nodes across 5 rules, 1050 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • serious color-contrast — Elements must meet minimum color contrast ratio thresholds 40 nodes
    Offending elements (5 of 40)
    1. .theme-doc-markdown > .theme-tabs-container.tabs-container.tabList__CuJ > .margin-top--md > .tabItem_Ymn6[role="tabpanel"]:nth-child(1) > .codeBlockContainer_Ckt0.theme-code-block.language-bash > .codeBlockContent_QJqH > pre > .codeBlockLines_e6Vv > .token-line:nth-child(1) > .function.token 
      <span class="token function" style="color: rgb(215, 58, 73);">npm</span>
    2. .tabItem_Ymn6[role="tabpanel"]:nth-child(1) > .codeBlockContainer_Ckt0.theme-code-block.language-bash > .codeBlockContent_QJqH > pre > .codeBlockLines_e6Vv > .token-line:nth-child(1) > .comment.token 
      <span class="token comment" style="color: rgb(153, 153, 136); font-style: italic;"># Downloads compatible Chrome during installation.</span>
    3. .tabItem_Ymn6[role="tabpanel"]:nth-child(1) > .codeBlockContainer_Ckt0.theme-code-block.language-bash > .codeBlockContent_QJqH > pre > .codeBlockLines_e6Vv > .token-line:nth-child(2) > .function.token 
      <span class="token function" style="color: rgb(215, 58, 73);">npm</span>
    4. .tabItem_Ymn6[role="tabpanel"]:nth-child(1) > .codeBlockContainer_Ckt0.theme-code-block.language-bash > .codeBlockContent_QJqH > pre > .codeBlockLines_e6Vv > .token-line:nth-child(2) > .comment.token 
      <span class="token comment" style="color: rgb(153, 153, 136); font-style: italic;"># Alternatively, install as a library, without downloading Chrome.</span>
    5. .admonitionContent_BuS1 > .theme-tabs-container.tabs-container.tabList__CuJ > .margin-top--md > .tabItem_Ymn6[role="tabpanel"]:nth-child(1) > .codeBlockContainer_Ckt0.theme-code-block.language-bash > .codeBlockContent_QJqH > pre > .codeBlockLines_e6Vv > .token-line > .function.token 
      <span class="token function" style="color: rgb(215, 58, 73);">install</span>
  • serious link-in-text-block — Links must be distinguishable without relying on color 2 nodes
    Offending elements
    1. blockquote > p > a[target="_blank"][rel="noopener noreferrer"]:nth-child(1) 
      <a href="https://chromedevtools.github.io/devtools-protocol/" target="_blank" rel="noopener noreferrer" class="">DevTools Protocol</a>
    2. blockquote > p > a[target="_blank"][rel="noopener noreferrer"]:nth-child(2) 
      <a href="https://pptr.dev/webdriver-bidi" target="_blank" rel="noopener noreferrer" class="">WebDriver BiDi</a>
  • critical button-name — Buttons must have discernible text 1 node
    Offending element
    1. .copyPageButton_s7x8 
      <button class="copyPageButton_s7x8" aria-expanded="false" aria-haspopup="true" data-copy-page-button-trigger="">
  • critical image-alt — Images must have alternative text 1 node
    Offending element
    1. img[height="200"] 
      <img decoding="async" loading="lazy" src="https://user-images.githubusercontent.com/10379601/29446482-04f7036a-841f-11e7-9872-91d1fc2ea683.png" height="200" align="right" class="img_ev3q">
  • moderate region — All page content should be contained by landmarks 1 node
    Offending element
    1. .CookieConsent > div:nth-child(1) 
      <div class="" style="flex: 1 0 300px; margin: 15px; font-size: inherit;">pptr.dev, Puppeteer's documentation site, uses cookies from Google to deliver and enhance the quality of its services and to a…

Accessibility failures 5 of 29 audits

  • color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 40 nodes
  • link-in-text-block — Links rely on color to be distinguishable. 2 nodes
  • button-name — Buttons do not have an accessible name 1 node
  • image-alt — Image elements do not have `[alt]` attributes 1 node
  • label-content-name-mismatch — Elements with visible text labels do not have matching accessible names. 1 node

Best Practices failures 2 of 19 audits

  • image-size-responsive — Serves images with low resolution 1 item
  • valid-source-maps — Missing source maps for large first-party JavaScript 1 item

SEO failures 1 of 9 audits

  • image-alt — Image elements do not have `[alt]` attributes 1 item

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

Measurement log

Field history 25 weeks

Weekly p75 from the CrUX History API, backfilled in a single request.

Week ending LCPINPCLSFCPTTFB
2026-10-03 1.74 s 188 ms 0.070 1.46 s 823 ms
2026-09-26 1.74 s 189 ms 0.070 1.48 s 817 ms
2026-09-19 1.79 s 195 ms 0.070 1.52 s 823 ms
2026-09-12 1.78 s 197 ms 0.070 1.49 s 837 ms
2026-09-05 1.82 s 228 ms 0.070 1.47 s 879 ms
2026-08-29 1.79 s 221 ms 0.070 1.34 s 755 ms
2026-08-22 1.81 s 220 ms 0.080 1.34 s 752 ms
2026-08-15 1.78 s 233 ms 0.080 1.32 s 755 ms
2026-08-08 1.78 s 233 ms 0.070 1.32 s 768 ms
2026-08-01 1.82 s 233 ms 0.080 1.37 s 800 ms
2026-07-25 1.74 s 212 ms 0.070 1.29 s 725 ms
2026-07-18 1.81 s 204 ms 0.070 1.29 s 731 ms

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 9, 2026, 10:14 AM UTC 88 3.24 s 0.064 242 ms 601 kB 3/3 ±5 2,450 -1% 48.7s Wayback
Oct 7, 2026, 2:08 AM UTC 90 3.18 s 0.064 191 ms 598 kB 3/3 ±22 3,363 +35% 49s Wayback
Oct 4, 2026, 4:37 AM UTC 94 1.44 s 0.015 282 ms 598 kB 3/3 ±22 2,690 +8% 49.2s Wayback
Oct 1, 2026, 8:09 PM UTC 92 1.44 s 0.015 333 ms 598 kB 3/3 ±28 2,454 -1% 50s Wayback
Sep 29, 2026, 5:47 PM UTC 85 3.27 s 0.015 352 ms 596 kB 3/3 ±7 2,487 0% 50.5s Wayback
Sep 26, 2026, 6:25 PM UTC 86 1.44 s 0.015 539 ms 597 kB 3/3 ±2 2,515 +1% 50.3s Wayback
Sep 24, 2026, 7:16 AM UTC 86 3.21 s 0.064 302 ms 587 kB 3/3 ±7 2,505 +1% 49.7s Wayback
Sep 22, 2026, 3:36 AM UTC 90 3.03 s 0.015 238 ms 586 kB 3/3 ±3 2,946 +18% 48.6s Wayback
Sep 18, 2026, 11:10 PM UTC 86 3.20 s 0.064 300 ms 586 kB 3/3 ±30 2,490 0% 50s Wayback
Sep 16, 2026, 9:53 PM UTC 92 2.99 s 0.065 163 ms 586 kB 3/3 ±48 2,916 +17% 51.3s Wayback
Sep 14, 2026, 9:41 PM UTC 86 3.27 s 0.064 282 ms 586 kB 3/3 ±15 2,186 -12% 50.4s Wayback
Sep 12, 2026, 6:58 AM UTC 87 3.18 s 0.064 260 ms 585 kB 3/3 ±25 2,460 -1% 50.2s Wayback
Sep 10, 2026, 5:40 AM UTC 65 4.90 s 0.175 383 ms 585 kB 3/3 ±1 3,373 +36% 23.8s Wayback
Sep 8, 2026, 12:57 AM UTC 88 3.17 s 0.064 250 ms 584 kB 3/3 ±5 2,493 0% 26.4s Wayback
Sep 6, 2026, 12:39 AM UTC 87 3.19 s 0.064 253 ms 584 kB 3/3 ±30 2,481 0% 26.5s Wayback
Sep 4, 2026, 10:46 AM UTC 87 3.26 s 0.064 255 ms 584 kB 3/3 ±0 2,467 -1% 25.8s Wayback
Sep 3, 2026, 1:10 AM UTC 88 3.08 s 0.064 249 ms 583 kB 3/3 ±18 2,483 0% 28s Wayback
Sep 1, 2026, 11:26 PM UTC 96 1.40 s 0.012 214 ms 584 kB 3/3 ±5 3,247 +31% 24.7s Wayback
Aug 31, 2026, 10:32 PM UTC 88 3.15 s 0.064 241 ms 580 kB 3/3 ±1 2,470 -1% 26.4s Wayback
Aug 27, 2026, 7:00 PM UTC 88 3.10 s 0.064 251 ms 579 kB 3/3 ±7 2,436 -2% 26.2s Wayback