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.

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2019.nejsconf.com

https://2019.nejsconf.com/

92PERF 94A11Y 100BEST 100SEO ✗AXE –CWV

Ranks Overall #1,257 Built Awesome #861

Data from Oct 2, 2026, 12:34 AM UTC old Measured once a week · 7 runs since Aug 20, 2026

Elsewhere: PageSpeed Insights · Calibre · Treo · CrUX Vis · Tame the Bots · 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).

Stack

Netlify Hosted by Netlify

Lighthouse Scores LAB Simulated

92
Performance
↓ -1 (-1.1%)
94
Accessibility
no change
100
Best Practices
no change
100
SEO
no change

Metrics LAB

No field data: the Chrome UX Report is not being collected for this project, so every figure below is from the Lighthouse run.

Metric Lab Simulated
Value Change / range Trend
LCP CWV (estimate) Largest Contentful Paint 3.33 s needs work ↑ +173 ms (+5.5%) 2.36 s – 3.33 s
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a —
CLS CWV (estimate) Cumulative Layout Shift 0.059 good → no change 0.017 – 0.059
TBT Total Blocking Time 0 ms good → no change 0 ms – 19 ms
FCP First Contentful Paint 815 ms good ↑ +13 ms (+1.6%) 799 ms – 872 ms
Speed Index 815 ms good ↑ +13 ms (+1.6%) 799 ms – 912 ms
TTFB Time to First Byte 628 ms good ↑ +23 ms (+3.8%) 605 ms – 671 ms

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.

resource load duration 103 ms
element render delay 57 ms
resource load delay 47 ms
time to first byte 28 ms

Page weight

Metric Value Change / range Trend
Page Weight 490 kB ↓ -94 B 490 kB – 492 kB
Requests 32 → no change 32 – 33
Third-party Weight 84.6 kB ↓ -4 B 84.6 kB – 84.6 kB
Third-party CPU 1 ms ↑ +0 ms (+12.5%) 1 ms – 1 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
image 81.6% 400 kB 26
font 15.8% 77.4 kB 3
script 1.4% 7.0 kB 1
document 0.8% 3.9 kB 1
stylesheet 0.4% 2.0 kB 1
Total 490 kB 32

Third parties 1 entities

Entity Transfer Size Main thread Simulated
Adobe TypeKit font 84.6 kB 1 ms
Total 84.6 kB 1 ms

Page health

Metric Value Change / range Trend
Main Thread Work 497 ms ↑ +29 ms (+6.2%) 468 ms – 584 ms
Long Tasks 0 → no change 0 – 1
DOM Elements 228 → no change 228 – 228
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 12 → no change 12 – 12
A11y Failures 2 → no change 2 – 2
A11y Failing Nodes 2 → no change 2 – 2

Main thread work

Task Time Share Duration Simulated
other 58% 288 ms
style layout 24% 119 ms
paint composite render 9% 43 ms
script evaluation 7% 34 ms
parse HTML 2% 11 ms
script parse compile 1% 3 ms
Total 497 ms

Axe violations axe-core 4.13.0, full rule set

12 violating nodes across 4 rules, 556 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • moderate region — All page content should be contained by landmarks 9 nodes
    Offending elements (5 of 9)
    1. .head > h2 
      <h2>August&nbsp;9, 2019</h2>
    2. .head > h3 
      <h3>Henry Doorly Zoo&nbsp;&amp;&nbsp;Aquarium<br>Omaha,&nbsp;Nebraska</h3>
    3. #info 
      <section id="info">
    4. #speakers 
      <section id="speakers">
    5. #dates 
      <section id="dates" class="calendar__section">
  • moderate heading-order — Heading levels should only increase by one 1 node
    Offending element
    1. a[href$="adrienne-tacke/"] > h4 
      <h4>Adrienne Tacke</h4>
  • moderate landmark-one-main — Document should have one main landmark 1 node
    Offending element
    1. html 
      <html lang="en" class="wf-effra-n4-active wf-effra-i9-active wf-effra-n9-active wf-active">
  • moderate page-has-heading-one — Page should contain a level-one heading 1 node
    Offending element
    1. html 
      <html lang="en" class="wf-effra-n4-active wf-effra-i9-active wf-effra-n9-active wf-active">

Accessibility failures 2 of 14 audits

  • heading-order — Heading elements are not in a sequentially-descending order 1 node
  • landmark-one-main — Document does not have a main landmark. 1 node

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

Measurement log

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 2, 2026, 12:34 AM UTC 92 3.33 s 0.059 0 ms 490 kB 3/3 ±12 2,368 -5% 25.1s Wayback
Sep 25, 2026, 12:29 AM UTC 93 3.15 s 0.059 0 ms 490 kB 3/3 ±6 2,495 0% 25.7s Wayback
Sep 17, 2026, 11:25 PM UTC 92 3.31 s 0.059 19 ms 490 kB 3/3 ±6 2,477 0% 25.3s Wayback
Sep 10, 2026, 9:27 PM UTC 92 3.31 s 0.059 11 ms 490 kB 3/3 ±6 2,451 -1% 22.8s Wayback
Sep 3, 2026, 7:18 PM UTC 98 2.36 s 0.017 0 ms 492 kB 3/3 ±7 2,448 -2% 23.2s Wayback
Aug 27, 2026, 4:09 PM UTC 94 3.16 s 0.017 13 ms 490 kB 3/3 ±3 2,481 0% 23.6s Wayback
Aug 20, 2026, 3:36 PM UTC 92 3.31 s 0.059 0 ms 490 kB 3/3 ±8 2,344 -6% 25s Wayback

Embed this score

Use this web component to show 2019.nejsconf.com's scores on any website, updated whenever this instance re-measures. Don’t forget to bundle the speedlify2-score.js component code into your site! 

<speedlify2-score speedlify-url="https://www.speedlify.dev/" url="https://2019.nejsconf.com/"></speedlify2-score>