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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
76
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.15 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

3.09 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

28 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.037

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.28 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

5.37 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
8.9 MB transferred, 57 requests
FIX
8.9 MB transferred, 57 requests
Critical::
Page weighs 9.7 MB (8.9 MB transferred)
Warning::
Images are 8.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 8.6 MB
Info::
57 HTTP requests
Info::
Estimated 1.9 g CO2 per page load
8.9 MB / 2.4 MB budget
8.9 MB transferred
57 requests
1.9 g CO2 per page load
Images 8.6 MiB 97%
JavaScript 155.9 KiB 2%
CSS 75.9 KiB 1%
Fonts 46.0 KiB 1%
HTML 15.6 KiB 0%
Other 9.7 KiB 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (8.9 MiB of 8.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
57 resources · 8.9 MB · 66 KB savings available
FIX
57 resources · 8.9 MB · 66 KB savings available
Warning::
Page weight 7.9 MB over 1MB target
Got: 8.9 MB Expected: ≤ 1 MB
Info::
~66 KB of savings available
Warning::
56 third-party resources (100% of weight)
Info::
9 resources over 200KB
57 resources · 8.9 MiB · 56 third-party 7.9 MiB over 1MB target
Image 97% · 8.6 MiB
JavaScript 2% · 155.9 KiB
CSS 1% · 75.9 KiB
Font 1% · 46.0 KiB
Document 0% · 15.8 KiB

~66.1 KiB of savings available

Remove unused JavaScript: 66.1 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
38 images, 0 KB saveable
REVIEW
38 images, 0 KB saveable
Info::
All images are well-optimized
38 images 8.6 MB
0 oversized -0 KB
37 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
859ms total JS execution
REVIEW
859ms total JS execution
Warning::
https://www.icao.int/: 404ms CPU time
Info::
https://www.icao.int/sites/default/files/js/js_XpG...: 232ms CPU time
Info::
Unattributable: 222ms CPU time
Warning::
Third-party scripts: 859ms (100% of total)

Main Thread Breakdown

Other 41% Style & Layout 27% Script Evaluation 21% Rendering 7% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.icao.int/404ms6ms1ms3rd
https://www.icao.int/sites/default/files/js/js_XpGo-7YnhWYD3bY-9f3n3Hr1vsXkkqzwci3L6cI2qBc.js?scope=footer&delta=1&language=en&theme=icao&include=eJxdjksOwyAMRC8EYdXzVMMnlMTBEThquX1pEyltFh69eZYsw3th5GZwwDAWzqIss1QpWG_mRD1VTZBQRUXmSOEuiCb2uPYBE17_clHJgY1D8f1I4012EYktSFdplHLc3YOXcJLO4Vl_6ucZCTE5HRl0bCjZgtI0-CIqJTfvqqMPRVvkHIqaCYXNN1VdsfTJhu24VdfPvwH3-2rX232ms144ms1ms3rd
Unattributable222ms5ms0ms3rd
B
JS Bundles
7 scripts, 66 KB unused
REVIEW
7 scripts, 66 KB unused
Warning::
https://www.icao.int/sites/default/files/js/js_Lbk...: 45 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.addtoany.com/menu/modules/core.ydpp...: 21 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 66 KB
66 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.icao.int/sites/default/files/js/js_LbkFMHu_WHmpwebeqTN0k7K0KxtdVxijtLI4MG7o1Lo.js?scope=footer&delta=3&language=en&theme=icao&include=eJxdjksOwyAMRC8EYdXzVMMnlMTBEThquX1pEyltFh69eZYsw3th5GZwwDAWzqIss1QpWG_mRD1VTZBQRUXmSOEuiCb2uPYBE17_clHJgY1D8f1I4012EYktSFdplHLc3YOXcJLO4Vl_6ucZCTE5HRl0bCjZgtI0-CIqJTfvqqMPRVvkHIqaCYXNN1VdsfTJhu24VdfPvwH3-2rX69 KB45 KB (66%)✓3rd
https://static.addtoany.com/menu/modules/core.ydpp7jcu.js26 KB21 KB (82%)✓3rd
https://www.icao.int/sites/default/files/js/js_cJ1ZtYMrqAVzwa2llwTHfn4qLOuy8nz5RhL8wl-QGaU.js?scope=header&delta=0&language=en&theme=icao&include=eJxdjksOwyAMRC8EYdXzVMMnlMTBEThquX1pEyltFh69eZYsw3th5GZwwDAWzqIss1QpWG_mRD1VTZBQRUXmSOEuiCb2uPYBE17_clHJgY1D8f1I4012EYktSFdplHLc3YOXcJLO4Vl_6ucZCTE5HRl0bCjZgtI0-CIqJTfvqqMPRVvkHIqaCYXNN1VdsfTJhu24VdfPvwH3-2rX0 KB—✓3rd
https://www.icao.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.131 KB—✓3rd
https://www.icao.int/sites/default/files/js/js_XpGo-7YnhWYD3bY-9f3n3Hr1vsXkkqzwci3L6cI2qBc.js?scope=footer&delta=1&language=en&theme=icao&include=eJxdjksOwyAMRC8EYdXzVMMnlMTBEThquX1pEyltFh69eZYsw3th5GZwwDAWzqIss1QpWG_mRD1VTZBQRUXmSOEuiCb2uPYBE17_clHJgY1D8f1I4012EYktSFdplHLc3YOXcJLO4Vl_6ucZCTE5HRl0bCjZgtI0-CIqJTfvqqMPRVvkHIqaCYXNN1VdsfTJhu24VdfPvwH3-2rX5 KB—✓3rd
https://www.icao.int/libraries/klaro/dist/klaro-no-translations-no-css.js?tdl11c23 KB—✓3rd
https://static.addtoany.com/menu/page.js2 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
3 fonts (46 KB)
PASS
3 fonts (46 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

46 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 3.1 shttps://fonts.gstatic.com/s/barlow/v13/7cHpv4kjgoGqM7E_DMs5ynghnQ.woff27cHpv4kjgoGqM7E_DMs5yng... https://fonts.gstatic.com/s/barlow/v13/7cHpv4kjgoGqM7E_DMs5ynghnQ.woff2 — 15.3 KiB — 23 ms — font-display: swaphttps://fonts.gstatic.com/s/barlow/v13/7cHqv4kjgoGqM7E3t-4s51ostz0rdg.woff27cHqv4kjgoGqM7E3t-4s51o... https://fonts.gstatic.com/s/barlow/v13/7cHqv4kjgoGqM7E3t-4s51ostz0rdg.woff2 — 15.4 KiB — 13 ms — font-display: swaphttps://fonts.gstatic.com/s/barlow/v13/7cHqv4kjgoGqM7E3_-gs51ostz0rdg.woff27cHqv4kjgoGqM7E3_-gs51o... https://fonts.gstatic.com/s/barlow/v13/7cHqv4kjgoGqM7E3_-gs51ostz0rdg.woff2 — 15.3 KiB — 17 ms — font-display: swap
7cHpv4kjgoGqM7E_DMs5yng... woff2 swap
Size 15 KB
Load time 23 ms
Start 654 ms
Risk FOUT — text flashes from fallback to web font
7cHqv4kjgoGqM7E3t-4s51o... woff2 swap
Size 15 KB
Load time 13 ms
Start 656 ms
Risk FOUT — text flashes from fallback to web font
7cHqv4kjgoGqM7E3_-gs51o... woff2 swap
Size 15 KB
Load time 17 ms
Start 657 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
57 requests over 1459ms
INFO
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https://www.icao.int/sites/default/files/css/css_ja2WRNluDerODjF6tdmyYpf_QilPiTjAb050qyaYbCc.css?delta=0&language=en&theme=icao&include=eJxlkNGOAyEIRX9oHJ_6QaiMS4oyAaeN-_Xr1iZ1sy_kcCDhBkipCdTu4Q37oVLbFkSaNYXz5gMYrn1BM8hoWxRFn_Q6gXdqWByTtWmraAGmb9wogvgImhxDl6tNkVkCsLPWmWqe7ksKfsgBqRsHj4PiYis-bWl_IzXMFF0W4PeEoSaLcKL7d5cpKGh3IPZXGFO8TzUwoa7sAtQ61J1Bxb_qyk4eqDoWN-s2_jA_9qAR1b_qXiRdjD-TTYo4 — 200 — 7.0 KiB — 17 ms — h2https://www.icao.int/sites/default/files/css/css_eRCDdTzx0YcvVspAPPgvkJTVZ3N3ttzyjDgCDi7Ra_4.css?delta=1&language=en&theme=icao&include=eJxlkNGOAyEIRX9oHJ_6QaiMS4oyAaeN-_Xr1iZ1sy_kcCDhBkipCdTu4Q37oVLbFkSaNYXz5gMYrn1BM8hoWxRFn_Q6gXdqWByTtWmraAGmb9wogvgImhxDl6tNkVkCsLPWmWqe7ksKfsgBqRsHj4PiYis-bWl_IzXMFF0W4PeEoSaLcKL7d5cpKGh3IPZXGFO8TzUwoa7sAtQ61J1Bxb_qyk4eqDoWN-s2_jA_9qAR1b_qXiRdjD-TTYo4www.icao.int/sites/default/files/cs... https://www.icao.int/sites/default/files/css/css_eRCDdTzx0YcvVspAPPgvkJTVZ3N3ttzyjDgCDi7Ra_4.css?delta=1&language=en&theme=icao&include=eJxlkNGOAyEIRX9oHJ_6QaiMS4oyAaeN-_Xr1iZ1sy_kcCDhBkipCdTu4Q37oVLbFkSaNYXz5gMYrn1BM8hoWxRFn_Q6gXdqWByTtWmraAGmb9wogvgImhxDl6tNkVkCsLPWmWqe7ksKfsgBqRsHj4PiYis-bWl_IzXMFF0W4PeEoSaLcKL7d5cpKGh3IPZXGFO8TzUwoa7sAtQ61J1Bxb_qyk4eqDoWN-s2_jA_9qAR1b_qXiRdjD-TTYo4 — 200 — 58.9 KiB — 33 ms — h2https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300..800;1,300..800&display=swapfonts.googleapis.com/css2?family=Op... https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300..800;1,300..800&display=swap — 200 — 2.2 KiB — 37 ms — h2https://fonts.googleapis.com/css2?family=Barlow:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500;1,600;1,700&display=swapfonts.googleapis.com/css2?family=Ba... https://fonts.googleapis.com/css2?family=Barlow:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500;1,600;1,700&display=swap — 200 — 850 B — 44 ms — h2https://www.icao.int/sites/default/files/css/css__cHEUnSfJsZ9MDAQmYfkSf-Vc4huA13Y46_HHL6B_YY.css?delta=4&language=en&theme=icao&include=eJxlkNGOAyEIRX9oHJ_6QaiMS4oyAaeN-_Xr1iZ1sy_kcCDhBkipCdTu4Q37oVLbFkSaNYXz5gMYrn1BM8hoWxRFn_Q6gXdqWByTtWmraAGmb9wogvgImhxDl6tNkVkCsLPWmWqe7ksKfsgBqRsHj4PiYis-bWl_IzXMFF0W4PeEoSaLcKL7d5cpKGh3IPZXGFO8TzUwoa7sAtQ61J1Bxb_qyk4eqDoWN-s2_jA_9qAR1b_qXiRdjD-TTYo4www.icao.int/sites/default/files/cs... https://www.icao.int/sites/default/files/css/css__cHEUnSfJsZ9MDAQmYfkSf-Vc4huA13Y46_HHL6B_YY.css?delta=4&language=en&theme=icao&include=eJxlkNGOAyEIRX9oHJ_6QaiMS4oyAaeN-_Xr1iZ1sy_kcCDhBkipCdTu4Q37oVLbFkSaNYXz5gMYrn1BM8hoWxRFn_Q6gXdqWByTtWmraAGmb9wogvgImhxDl6tNkVkCsLPWmWqe7ksKfsgBqRsHj4PiYis-bWl_IzXMFF0W4PeEoSaLcKL7d5cpKGh3IPZXGFO8TzUwoa7sAtQ61J1Bxb_qyk4eqDoWN-s2_jA_9qAR1b_qXiRdjD-TTYo4 — 200 — 7.1 KiB — 22 ms — h2https://www.icao.int/sites/default/files/js/js_cJ1ZtYMrqAVzwa2llwTHfn4qLOuy8nz5RhL8wl-QGaU.js?scope=header&delta=0&language=en&theme=icao&include=eJxdjksOwyAMRC8EYdXzVMMnlMTBEThquX1pEyltFh69eZYsw3th5GZwwDAWzqIss1QpWG_mRD1VTZBQRUXmSOEuiCb2uPYBE17_clHJgY1D8f1I4012EYktSFdplHLc3YOXcJLO4Vl_6ucZCTE5HRl0bCjZgtI0-CIqJTfvqqMPRVvkHIqaCYXNN1VdsfTJhu24VdfPvwH3-2rXwww.icao.int/sites/default/files/js... https://www.icao.int/sites/default/files/js/js_cJ1ZtYMrqAVzwa2llwTHfn4qLOuy8nz5RhL8wl-QGaU.js?scope=header&delta=0&language=en&theme=icao&include=eJxdjksOwyAMRC8EYdXzVMMnlMTBEThquX1pEyltFh69eZYsw3th5GZwwDAWzqIss1QpWG_mRD1VTZBQRUXmSOEuiCb2uPYBE17_clHJgY1D8f1I4012EYktSFdplHLc3YOXcJLO4Vl_6ucZCTE5HRl0bCjZgtI0-CIqJTfvqqMPRVvkHIqaCYXNN1VdsfTJhu24VdfPvwH3-2rX — 200 — 317 B — 28 ms — h2https://www.icao.int/sites/default/files/logo.svgwww.icao.int/sites/default/files/lo... https://www.icao.int/sites/default/files/logo.svg — 200 — 24.8 KiB — 28 ms — h2https://www.icao.int/sites/default/files/2025-09/GOAL-1.pngwww.icao.int/sites/default/files/20... https://www.icao.int/sites/default/files/2025-09/GOAL-1.png — 200 — 103.8 KiB — 21 ms — h2https://www.icao.int/sites/default/files/2025-09/GOAL-2_0.pngwww.icao.int/sites/default/files/20... https://www.icao.int/sites/default/files/2025-09/GOAL-2_0.png — 200 — 78.9 KiB — 22 ms — h2https://www.icao.int/sites/default/files/2025-09/GOAL-3.pngwww.icao.int/sites/default/files/20... https://www.icao.int/sites/default/files/2025-09/GOAL-3.png — 200 — 101.6 KiB — 19 ms — h2https://www.icao.int/sites/default/files/2025-09/GOAL-4.pngwww.icao.int/sites/default/files/20... https://www.icao.int/sites/default/files/2025-09/GOAL-4.png — 200 — 111.0 KiB — 20 ms — h2https://www.icao.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.1www.icao.int/core/assets/vendor/jqu... https://www.icao.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.1 — 200 — 30.5 KiB — 36 ms — h2https://www.icao.int/sites/default/files/js/js_XpGo-7YnhWYD3bY-9f3n3Hr1vsXkkqzwci3L6cI2qBc.js?scope=footer&delta=1&language=en&theme=icao&include=eJxdjksOwyAMRC8EYdXzVMMnlMTBEThquX1pEyltFh69eZYsw3th5GZwwDAWzqIss1QpWG_mRD1VTZBQRUXmSOEuiCb2uPYBE17_clHJgY1D8f1I4012EYktSFdplHLc3YOXcJLO4Vl_6ucZCTE5HRl0bCjZgtI0-CIqJTfvqqMPRVvkHIqaCYXNN1VdsfTJhu24VdfPvwH3-2rXwww.icao.int/sites/default/files/js... https://www.icao.int/sites/default/files/js/js_XpGo-7YnhWYD3bY-9f3n3Hr1vsXkkqzwci3L6cI2qBc.js?scope=footer&delta=1&language=en&theme=icao&include=eJxdjksOwyAMRC8EYdXzVMMnlMTBEThquX1pEyltFh69eZYsw3th5GZwwDAWzqIss1QpWG_mRD1VTZBQRUXmSOEuiCb2uPYBE17_clHJgY1D8f1I4012EYktSFdplHLc3YOXcJLO4Vl_6ucZCTE5HRl0bCjZgtI0-CIqJTfvqqMPRVvkHIqaCYXNN1VdsfTJhu24VdfPvwH3-2rX — 200 — 4.9 KiB — 42 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 859ms · 20KB · CA$12/mo
www.icao.int
Other
Costly
Execution 404ms
Transfer 15 KB
Monthly Cost CA$6/mo
www.icao.int
Other
Costly
Execution 232ms
Transfer 5 KB
Monthly Cost CA$3/mo
Unattributable
Other
Costly
Execution 222ms
Transfer 0 KB
Monthly Cost CA$3/mo

These scripts may cost more than they're worth

  • www.icao.int adds 404ms and costs ~CA$6/month
  • www.icao.int adds 232ms and costs ~CA$3/month
  • Unattributable adds 222ms and costs ~CA$3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.icao.int takes 404ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.icao.int takes 232ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 222ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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