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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

4.85 s

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

15.20 s

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

1.49 s

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

0.001

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

5.29 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.

15.33 s

Page Load Progression

502 ms
1.0 s
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 47 requests
FIX
3.1 MB transferred, 47 requests
Warning::
Page weighs 4.8 MB (3.1 MB transferred)
Warning::
JavaScript is 724 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 724 KB
Info::
Fonts are 526 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 526 KB
Info::
47 HTTP requests
Info::
Estimated 0.64 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
47 requests
0.64 g CO2 per page load
Other 1.0 MiB 33%
JavaScript 723.9 KiB 23%
Images 606.2 KiB 19%
Fonts 526.2 KiB 17%
Other 146.9 KiB 5%
CSS 77.6 KiB 2%
HTML 14.5 KiB 0%
Other 1.1 KiB 0%
Other 837 B 0%
Other 556 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4876ms total JS execution
FIX
4876ms total JS execution
Warning::
https://www.iaea.org/: 1508ms CPU time
Warning::
Unattributable: 768ms CPU time
Warning::
https://scripts.clarity.ms/0.8.59/clarity.js: 475ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-ZBGD...: 463ms CPU time
Warning::
https://www.iaea.org/cdn-cgi/challenge-platform/sc...: 449ms CPU time
Warning::
Third-party scripts: 4876ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 25% Style & Layout 14% Script Parsing & Compilation 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.iaea.org/1508ms124ms61ms3rd
Unattributable768ms45ms0ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js475ms411ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-ZBGD9EBHJG&cx=c&gtm=4e64h1463ms362ms95ms3rd
https://www.iaea.org/cdn-cgi/challenge-platform/scripts/jsd/main.js449ms425ms5ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KLWR9Z430ms341ms63ms3rd
https://www.googletagmanager.com/gtag/js?id=G-1E9Q7ZN68L&cx=c&gtm=4e64h1422ms340ms78ms3rd
https://s3.amazonaws.com/downloads.mailchimp.com/js/mc-validate.js179ms98ms28ms3rd
https://www.iaea.org/sites/default/files/css/css_v-e3-xXOKE9eI95fv8l-fL71POh5pM8hh6EwnL4GZbs.css?delta=1&language=en&theme=iaea_2025&include=eJxNyTEOgCAMAMAPNdSQ-B5SoAMGLKFF5fcmTi63XJLBmMfsVB0d9EAhpuA3v2MUMbVBPZQkp_5GbVUGXWrcMJIyXIVvxU_XJM_KL7TzIOk100ms0ms0ms3rd
https://www.iaea.org/sites/default/files/js/js_h8PyQ7F_-LpKmA34-21uZuTH7MoKSjrEJJdY8oxDdlw.js?scope=footer&delta=0&language=en&theme=iaea_2025&include=eJxdyEEKgCAURdENZYbQeuKVj59hfVKT2n0Nq8mFcz0KIi4mO3JGDZpyI6oSORSIlSd_t1hwfufaBBCD61xvc7kiX67BU83MpCZzP7hNvAEv1Csy82ms59ms0ms3rd
D
Page Weight Inventory
Action
47 resources · 3.1 MB · 289 KB savings available
FIX
47 resources · 3.1 MB · 289 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~289 KB of savings available
Warning::
46 third-party resources (100% of weight)
Info::
3 resources over 200KB
47 resources · 3.1 MiB · 46 third-party 2.1 MiB over 1MB target
Media 33% · 1.0 MiB
Image 24% · 752.4 KiB
JavaScript 23% · 723.9 KiB
Font 17% · 526.2 KiB
CSS 2% · 77.6 KiB
Document 0% · 14.9 KiB
Other 0% · 2.6 KiB

~288.5 KiB of savings available

Remove unused JavaScript: 288.5 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.

C
Image Optimization
Action
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Warning::
https://www.iaea.org/sites/default/files/styles/la... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.iaea.org/themes/custom/iaea_2025/build... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.iaea.org/sites/default/files/2025-04/d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.iaea.org/themes/custom/iaea_2025/build... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.iaea.org/sites/default/files/styles/la... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.iaea.org/sites/default/files/styles/la... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
12 images 606 KB
0 oversized -0 KB
6 legacy format
7 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

C
JS Bundles
Action
11 scripts, 289 KB unused
REVIEW
11 scripts, 289 KB unused
Warning::
https://s3.amazonaws.com/downloads.mailchimp.com/j...: 90 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-ZBGD...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-1E9Q...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KLW...: 64 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 289 KB
289 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://s3.amazonaws.com/downloads.mailchimp.com/js/mc-validate.js140 KB90 KB (65%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-ZBGD9EBHJG&cx=c&gtm=4e64h1169 KB68 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-1E9Q7ZN68L&cx=c&gtm=4e64h1157 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KLWR9Z131 KB64 KB (49%)✓3rd
https://www.iaea.org/sites/default/files/js/js_oEJ2yCTBp9dq1oh-MfbXd51DS7vts82x1HRC4PifCMc.js?scope=header&delta=0&language=en&theme=iaea_2025&include=eJxdyEEKgCAURdENZYbQeuKVj59hfVKT2n0Nq8mFcz0KIi4mO3JGDZpyI6oSORSIlSd_t1hwfufaBBCD61xvc7kiX67BU83MpCZzP7hNvAEv1Csy0 KB—✓3rd
https://www.iaea.org/modules/contrib/google_tag/js/gtag.js?tdufgg1 KB—✓3rd
https://www.iaea.org/modules/contrib/google_tag/js/gtm.js?tdufgg1 KB—✓3rd
https://www.iaea.org/sites/default/files/js/js_gQPKa9AseP5-3RRnTChhsjuUtmuETxcfyLwcAz9qrQI.js?scope=footer&delta=0&language=en&theme=iaea_2025&include=eJxdyEEKgCAURdENZYbQeuKVj59hfVKT2n0Nq8mFcz0KIi4mO3JGDZpyI6oSORSIlSd_t1hwfufaBBCD61xvc7kiX67BU83MpCZzP7hNvAEv1Csy84 KB—✓3rd
https://www.clarity.ms/tag/rfw4xhb56c?ref=gtm21 KB—✓3rd
https://scripts.clarity.ms/0.8.59/clarity.js26 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

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

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
9 fonts (526 KB)
PASS
9 fonts (526 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

526 KB total

Render-blocking

0

of 9

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 4.9 s LCP 15.2 shttps://www.iaea.org/themes/custom/iaea_2025/src/assets/fonts/roboto/roboto-v47-latin-regular.woff2roboto-v47-latin-regula... https://www.iaea.org/themes/custom/iaea_2025/src/assets/fonts/roboto/roboto-v47-latin-regular.woff2 — 20.2 KiB — 33 ms — font-display: swaphttps://www.iaea.org/themes/custom/iaea_2025/src/assets/fonts/roboto/roboto-v47-latin-700.woff2roboto-v47-latin-700.woff2 https://www.iaea.org/themes/custom/iaea_2025/src/assets/fonts/roboto/roboto-v47-latin-700.woff2 — 20.7 KiB — 20 ms — font-display: swaphttps://www.iaea.org/themes/custom/iaea_2025/src/assets/fonts/roboto/roboto-v47-latin-300.woff2roboto-v47-latin-300.woff2 https://www.iaea.org/themes/custom/iaea_2025/src/assets/fonts/roboto/roboto-v47-latin-300.woff2 — 20.3 KiB — 30 ms — font-display: swaphttps://www.iaea.org/themes/custom/iaea_2025/build/fonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.iaea.org/themes/custom/iaea_2025/build/fonts/fa-solid-900.woff2 — 154.8 KiB — 53 ms — font-display: swaphttps://www.iaea.org/themes/custom/iaea_2025/src/assets/fonts/roboto-condensed/roboto-condensed-v27-latin-300.woff2roboto-condensed-v27-la... https://www.iaea.org/themes/custom/iaea_2025/src/assets/fonts/roboto-condensed/roboto-condensed-v27-latin-300.woff2 — 20.5 KiB — 23 ms — font-display: swaphttps://www.iaea.org/themes/custom/iaea_2025/src/assets/fonts/roboto/roboto-v47-latin-500.woff2roboto-v47-latin-500.woff2 https://www.iaea.org/themes/custom/iaea_2025/src/assets/fonts/roboto/roboto-v47-latin-500.woff2 — 20.5 KiB — 25 ms — font-display: swaphttps://www.iaea.org/themes/custom/iaea_2025/build/assets/icons/bootstrap-icons/fonts/bootstrap-icons.woff2?e34853135f9e39acf64315236852cd5abootstrap-icons.woff2 https://www.iaea.org/themes/custom/iaea_2025/build/assets/icons/bootstrap-icons/fonts/bootstrap-icons.woff2?e34853135f9e39acf64315236852cd5a — 131.1 KiB — 54 ms — font-display: swaphttps://www.iaea.org/themes/custom/iaea_2025/build/fonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.iaea.org/themes/custom/iaea_2025/build/fonts/fa-brands-400.woff2 — 116.1 KiB — 55 ms — font-display: swaphttps://www.iaea.org/themes/custom/iaea_2025/src/assets/fonts/roboto/roboto-v47-latin-italic.woff2roboto-v47-latin-italic... https://www.iaea.org/themes/custom/iaea_2025/src/assets/fonts/roboto/roboto-v47-latin-italic.woff2 — 21.9 KiB — 57 ms — font-display: swap
roboto-v47-latin-regula... woff2 swap
Size 20 KB
Load time 33 ms
Start 270 ms
Risk FOUT — text flashes from fallback to web font
roboto-v47-latin-700.woff2 woff2 swap
Size 21 KB
Load time 20 ms
Start 270 ms
Risk FOUT — text flashes from fallback to web font
roboto-v47-latin-300.woff2 woff2 swap
Size 20 KB
Load time 30 ms
Start 271 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 53 ms
Start 272 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
roboto-condensed-v27-la... woff2 swap
Size 20 KB
Load time 23 ms
Start 272 ms
Risk FOUT — text flashes from fallback to web font
roboto-v47-latin-500.woff2 woff2 swap
Size 21 KB
Load time 25 ms
Start 273 ms
Risk FOUT — text flashes from fallback to web font
bootstrap-icons.woff2 woff2 swap
Size 131 KB
Load time 54 ms
Start 274 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 55 ms
Start 274 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
roboto-v47-latin-italic... woff2 swap
Size 22 KB
Load time 57 ms
Start 275 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)

Fixing the unchecked items could save ~201 KB and ~402 ms

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
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
47 requests over 1720ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 4.9 s LCP 15.2 shttps://iaea.org// https://iaea.org/ — 301 — 148 B — 27 ms — h2https://www.iaea.org/www.iaea.org/ https://www.iaea.org/ — 200 — 14.5 KiB — 24 ms — h2https://www.iaea.org/sites/default/files/css/css_9cevm9AYEu7LpJ03jP5c4slqTENCudLYgy4adLQwkAY.css?delta=0&language=en&theme=iaea_2025&include=eJxNyTEOgCAMAMAPNdSQ-B5SoAMGLKFF5fcmTi63XJLBmMfsVB0d9EAhpuA3v2MUMbVBPZQkp_5GbVUGXWrcMJIyXIVvxU_XJM_KL7TzIOkwww.iaea.org/sites/default/files/cs... https://www.iaea.org/sites/default/files/css/css_9cevm9AYEu7LpJ03jP5c4slqTENCudLYgy4adLQwkAY.css?delta=0&language=en&theme=iaea_2025&include=eJxNyTEOgCAMAMAPNdSQ-B5SoAMGLKFF5fcmTi63XJLBmMfsVB0d9EAhpuA3v2MUMbVBPZQkp_5GbVUGXWrcMJIyXIVvxU_XJM_KL7TzIOk — 200 — 1.6 KiB — 22 ms — h2https://www.iaea.org/sites/default/files/css/css_v-e3-xXOKE9eI95fv8l-fL71POh5pM8hh6EwnL4GZbs.css?delta=1&language=en&theme=iaea_2025&include=eJxNyTEOgCAMAMAPNdSQ-B5SoAMGLKFF5fcmTi63XJLBmMfsVB0d9EAhpuA3v2MUMbVBPZQkp_5GbVUGXWrcMJIyXIVvxU_XJM_KL7TzIOkwww.iaea.org/sites/default/files/cs... https://www.iaea.org/sites/default/files/css/css_v-e3-xXOKE9eI95fv8l-fL71POh5pM8hh6EwnL4GZbs.css?delta=1&language=en&theme=iaea_2025&include=eJxNyTEOgCAMAMAPNdSQ-B5SoAMGLKFF5fcmTi63XJLBmMfsVB0d9EAhpuA3v2MUMbVBPZQkp_5GbVUGXWrcMJIyXIVvxU_XJM_KL7TzIOk — 200 — 76.0 KiB — 32 ms — h2https://www.iaea.org/sites/default/files/js/js_oEJ2yCTBp9dq1oh-MfbXd51DS7vts82x1HRC4PifCMc.js?scope=header&delta=0&language=en&theme=iaea_2025&include=eJxdyEEKgCAURdENZYbQeuKVj59hfVKT2n0Nq8mFcz0KIi4mO3JGDZpyI6oSORSIlSd_t1hwfufaBBCD61xvc7kiX67BU83MpCZzP7hNvAEv1Csywww.iaea.org/sites/default/files/js... 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http/1.1https://region1.google-analytics.com/g/collect?v=2&tid=G-1E9Q7ZN68L&gtm=45je64h1v9233890515z871417563za20gzb71417563zd71417563&_p=1776805704349&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1688399247.1776805705&frm=0&pscdl=noapi&rcb=14&sr=412x823&tt=internal&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266400~117512543~118463261&sid=1776805704&sct=1&seg=0&dl=https%3A%2F%2Fwww.iaea.org%2F&dt=International%20Atomic%20Energy%20Agency%20%7C%20Atoms%20for%20Peace%20and%20Development&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=519region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-1E9Q7ZN68L&gtm=45je64h1v9233890515z871417563za20gzb71417563zd71417563&_p=1776805704349&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1688399247.1776805705&frm=0&pscdl=noapi&rcb=14&sr=412x823&tt=internal&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266400~117512543~118463261&sid=1776805704&sct=1&seg=0&dl=https%3A%2F%2Fwww.iaea.org%2F&dt=International%20Atomic%20Energy%20Agency%20%7C%20Atoms%20for%20Peace%20and%20Development&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=519 — 204 — 547 B — 128 ms — h2https://scripts.clarity.ms/0.8.59/clarity.jsscripts.clarity.ms/0.8.59/clarity.j... https://scripts.clarity.ms/0.8.59/clarity.js — 200 — 26.2 KiB — 38 ms — h2https://region1.analytics.google.com/g/collect?v=2&tid=G-ZBGD9EBHJG&gtm=45je64h1v869919049z871417563za20gzb71417563zd71417563&_p=1776805704349&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&_prs=wg&are=1&cid=1688399247.1776805705&frm=0&pscdl=noapi&rcb=18&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115616986~115938466~115938468~117266400~117512543~118463262&sid=1776805704&sct=1&seg=0&dl=https%3A%2F%2Fwww.iaea.org%2F&dt=International%20Atomic%20Energy%20Agency%20%7C%20Atoms%20for%20Peace%20and%20Development&en=page_view&_fv=2&_ss=2&_c=1&tfd=638region1.analytics.google.com/g/coll... https://region1.analytics.google.com/g/collect?v=2&tid=G-ZBGD9EBHJG&gtm=45je64h1v869919049z871417563za20gzb71417563zd71417563&_p=1776805704349&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&_prs=wg&are=1&cid=1688399247.1776805705&frm=0&pscdl=noapi&rcb=18&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115616986~115938466~115938468~117266400~117512543~118463262&sid=1776805704&sct=1&seg=0&dl=https%3A%2F%2Fwww.iaea.org%2F&dt=International%20Atomic%20Energy%20Agency%20%7C%20Atoms%20for%20Peace%20and%20Development&en=page_view&_fv=2&_ss=2&_c=1&tfd=638 — 204 — 290 B — 145 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-ZBGD9EBHJG&cid=1688399247.1776805705&gtm=45je64h1v869919049z871417563za20gzb71417563zd71417563&rcb=18&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115616986~115938466~115938468~117266400~117512543~118463262stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-ZBGD9EBHJG&cid=1688399247.1776805705&gtm=45je64h1v869919049z871417563za20gzb71417563zd71417563&rcb=18&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115616986~115938466~115938468~117266400~117512543~118463262 — 204 — 556 B — 30 ms — h2https://www.googletagmanager.com/td?id=G-ZBGD9EBHJG&v=3&t=t&pid=91490681&gtm=45je64h1v869919049za20gzb71417563zd71417563&seq=1&exp=0~115616986~115938466~115938468~117266400~118463262&dl=www.iaea.org%2F&tdp=G-ZBGD9EBHJG;69919049;1;6;0&frm=0&rtg=1417563&slo=4&hlo=4&lst=2&pcid=1417563&bt=0&ct=3&z=0www.googletagmanager.com/td?id=G-ZB... https://www.googletagmanager.com/td?id=G-ZBGD9EBHJG&v=3&t=t&pid=91490681&gtm=45je64h1v869919049za20gzb71417563zd71417563&seq=1&exp=0~115616986~115938466~115938468~117266400~118463262&dl=www.iaea.org%2F&tdp=G-ZBGD9EBHJG;69919049;1;6;0&frm=0&rtg=1417563&slo=4&hlo=4&lst=2&pcid=1417563&bt=0&ct=3&z=0 — 204 — 18 B — 9 ms — h3https://www.google.nl/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-ZBGD9EBHJG&cid=1688399247.1776805705&gtm=45je64h1v869919049z871417563za20gzb71417563zd71417563&rcb=18&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115616986~115938466~115938468~117266400~117512543~118463262&z=651164902www.google.nl/ads/ga-audiences?v=1&... https://www.google.nl/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-ZBGD9EBHJG&cid=1688399247.1776805705&gtm=45je64h1v869919049z871417563za20gzb71417563zd71417563&rcb=18&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115616986~115938466~115938468~117266400~117512543~118463262&z=651164902 — 200 — 408 B — 32 ms — h2https://h.clarity.ms/collecth.clarity.ms/collect https://h.clarity.ms/collect — 204 — 276 B — 286 ms — http/1.1https://www.iaea.org/cdn-cgi/challenge-platform/scripts/jsd/main.jswww.iaea.org/cdn-cgi/challenge-plat... https://www.iaea.org/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 172 B — 18 ms — h2https://www.iaea.org/themes/custom/iaea_2025/build/assets/videos/na-9.webmwww.iaea.org/themes/custom/iaea_202... https://www.iaea.org/themes/custom/iaea_2025/build/assets/videos/na-9.webm — 206 — 252.0 KiB — 26 ms — h2https://www.iaea.org/themes/custom/iaea_2025/build/assets/videos/ns-9.webmwww.iaea.org/themes/custom/iaea_202... https://www.iaea.org/themes/custom/iaea_2025/build/assets/videos/ns-9.webm — 206 — 783.9 KiB — 56 ms — h2https://www.iaea.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?www.iaea.org/cdn-cgi/challenge-plat... https://www.iaea.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? — 200 — 12.8 KiB — 10 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 4876ms · 715KB · €53/mo
www.iaea.org
Other
Costly
Execution 1508ms
Transfer 14 KB
Monthly Cost €16/mo
Unattributable
Other
Costly
Execution 768ms
Transfer 0 KB
Monthly Cost €8/mo
Microsoft Clarity
Session Replay
Costly
Execution 475ms
Transfer 26 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 463ms
Transfer 169 KB
Unused 40%
Monthly Cost €5/mo
www.iaea.org
Other
Costly
Execution 449ms
Transfer 0 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 430ms
Transfer 131 KB
Unused 49%
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 422ms
Transfer 157 KB
Unused 42%
Monthly Cost €5/mo
s3.amazonaws.com
Other
Optional
Execution 179ms
Transfer 140 KB
Unused 65%
Monthly Cost €2/mo
www.iaea.org
Other
Optional
Execution 100ms
Transfer 76 KB
Monthly Cost €1/mo
www.iaea.org
Other
Optional
Execution 82ms
Transfer 0 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.iaea.org adds 1508ms and costs ~€16/month
  • Unattributable adds 768ms and costs ~€8/month
  • Microsoft Clarity adds 475ms and costs ~€5/month
  • Google Tag Manager adds 463ms and costs ~€5/month
  • www.iaea.org adds 449ms and costs ~€5/month
  • Google Tag Manager adds 430ms and costs ~€5/month
  • Google Tag Manager adds 422ms and costs ~€5/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.iaea.org takes 1508ms 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 768ms 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

Microsoft Clarity takes 475ms 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

Google Tag Manager takes 463ms 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.iaea.org takes 449ms 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

Google Tag Manager takes 430ms 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

Google Tag Manager takes 422ms 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

65% of s3.amazonaws.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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