speedlify2

Lighthouse lab metrics, Axe, and Chrome UX Report field data for a list of sites recorded and compared over time.

Charts Compare Measurement runs Embed a score

flag.is

https://flag.is/

100 100 100 100 ✗AXE –CWV

Ranks Overall #1,019 Built Awesome #788

Data from Sep 9, 2026, 3:17 AM UTC old Measured once a week · 7 runs since Aug 20, 2026

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

The measuring machine was faster than most in this project.

Lighthouse benchmark index was 3,545, 43% faster than this project's median of 2,481. CPU-bound metrics — TBT, TTI, main thread work — are affected by this and may have moved without the site changing at all.

Lighthouse Scores

100
Performance
no change
100
Accessibility
no change
100
Best Practices
no change
100
SEO
no change

Metrics Lighthouse, mobile

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 Lighthouse
Value Change / range Trend
LCP CWV (estimate) Largest Contentful Paint 843 ms good ↓ -30 ms (-3.4%) 836 ms – 873 ms
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a —
CLS CWV (estimate) Cumulative Layout Shift 0 good → no change 0 – 0
TBT Total Blocking Time 54 ms good ↑ +54 ms 0 ms – 54 ms
FCP First Contentful Paint 843 ms good ↓ -30 ms (-3.4%) 836 ms – 873 ms
Speed Index 1.09 s good ↓ -211 ms (-16.2%) significant 1.09 s – 1.30 s
TTFB Time to First Byte 600 ms good ↓ -2 ms (-0.3%) 600 ms – 621 ms

LCP Subparts lab observed, unthrottled

The subparts attribute LCP to your server, resource discovery, download, or rendering. Note that the Lab LCP shown above is throttled.

time to first byte 455 ms
element render delay 75 ms

Page weight

Metric Value Change / range Trend
Page Weight 86.7 kB → no change 86.7 kB – 87.5 kB
Requests 80 → no change 80 – 80
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

  • image 87.2% 75.6 kB · 78 req
  • document 12.1% 10.5 kB · 1 req
  • other 0.7% 585 B · 1 req

Page health

Metric Value Change / range Trend
Main Thread Work 1.15 s ↓ -62 ms (-5.1%) 1.09 s – 1.21 s
Long Tasks 1 ↓ -1 (-50%) 1 – 2
DOM Elements 359 → no change 359 – 359
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 7 → no change 7 – 7
A11y Failures 0 → no change 0 – 0
A11y Failing Nodes 0 → no change 0 – 0

Main thread work

other 740 ms
style layout 170 ms
paint composite render 162 ms
script evaluation 39 ms
parse HTML 28 ms
garbage collection 10 ms
script parse compile 2 ms

Axe violations axe-core 4.13.0, full rule set

7 violating nodes across 3 rules, 42 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 5 nodes
  • moderate landmark-one-main — Document should have one main landmark 1 node
  • moderate meta-viewport — Zooming and scaling must not be disabled 1 node

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache http/1.1

Measurement log

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Sep 9, 2026, 3:17 AM UTC 100 843 ms 0 54 ms 86.7 kB 1/3 — 3,545 +43% 505.5s Wayback
Sep 2, 2026, 3:04 AM UTC 100 873 ms 0 0 ms 86.7 kB 1/3 — 2,791 +12% 446.2s Wayback
Sep 1, 2026, 5:40 PM UTC lighthouse timed out after 120000ms 141.1s
Sep 1, 2026, 7:21 AM UTC CHROME_INTERSTITIAL_ERROR: Chrome prevented page load with an interstitial. Make sure you are testing the correct URL and that the server is properly responding to all requests. 70s
Aug 31, 2026, 10:39 PM UTC lighthouse timed out after 120000ms 143.8s
Aug 29, 2026, 5:49 AM UTC NO_FCP: The page did not paint any content. Please ensure you keep the browser window in the foreground during the load and try again. (NO_FCP) 66.9s
Aug 20, 2026, 10:31 PM UTC 100 836 ms 0 0 ms 87.5 kB 2/3 ±0 2,703 +9% 306.6s Wayback

Embed this score

Use this web component to show flag.is'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://flag.is/"></speedlify2-score>