Skip to content
https://wmo.int

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
1
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
85
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
100
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.

577 ms

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

2.30 s

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

0 ms

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

0.002

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

1.83 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.

2.41 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
8 PASS 4 REVIEW 1 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 58 requests
FIX
2.2 MB transferred, 58 requests
Info::
Page weighs 3.5 MB (2.2 MB transferred)
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Info::
58 HTTP requests
Info::
Estimated 0.47 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
58 requests
0.47 g CO2 per page load
Images 1.6 MiB 73%
JavaScript 497.1 KiB 22%
Fonts 56.8 KiB 2%
CSS 37.3 KiB 2%
HTML 26.3 KiB 1%
Other 2.5 KiB 0%
Other 1.2 KiB 0%
Other 1009 B 0%
Other 569 B 0%
Other 552 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
Image Optimization
Action
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://wmo.int/themes/custom/server_theme/dist/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://wmo.int/themes/custom/server_theme/dist/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://wmo.int/themes/custom/server_theme/dist/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://wmo.int/themes/custom/server_theme/dist/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://wmo.int/themes/custom/server_theme/dist/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://wmo.int/themes/custom/server_theme/dist/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 1.6 MB
0 oversized -0 KB
21 legacy format
6 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

C
JS Bundles
Action
17 scripts, 165 KB unused
REVIEW
17 scripts, 165 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-M3ZT...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MWX...: 62 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 38 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 165 KB
165 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-M3ZTFRL6FX&cx=c&gtm=4e64h1159 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MWXW8B2135 KB62 KB (46%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://wmo.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.032 KB—✓1st
https://www.clarity.ms/tag/k6cqa825se?ref=gtm1 KB—✓3rd
https://wmo.int/sites/default/files/js/js_5DiEVTfhWPQ-6xjpVEblnZB6oSr14VRLjB9aef9cKCU.js?scope=footer&delta=1&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ18 KB—✓1st
https://wmo.int/sites/default/files/js/js_Tm2kJcaIuY7ctfvQK8t4l8XY8EcK8mW-ajujIpz__jE.js?scope=footer&delta=3&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ26 KB—✓1st
https://wmo.int/themes/custom/server_theme/dist/js/gtm-opt-out.js?tdsma70 KB—✓1st
https://wmo.int/sites/default/files/js/js_tPB0X5w-UvQN_62MtIjK3BwaZe6wzQdEVzf_hwmM8lY.js?scope=header&delta=3&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ3 KB—✓1st
https://cdn.rollbar.com/rollbarjs/refs/tags/v2.26.3/rollbar.min.js24 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

C
Page Weight Inventory
Action
58 resources · 2.2 MB · 165 KB savings available
REVIEW
58 resources · 2.2 MB · 165 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~165 KB of savings available
Info::
18 third-party resources (21% of weight)
Info::
3 resources over 200KB
58 resources · 2.2 MiB · 18 third-party 1.2 MiB over 1MB target
Image 73% · 1.6 MiB
JavaScript 22% · 497.1 KiB
Font 2% · 56.8 KiB
CSS 2% · 37.3 KiB
Document 1% · 26.3 KiB
Other 0% · 3.3 KiB

~165.0 KiB of savings available

Remove unused JavaScript: 165.0 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Third-Party Impact
21% third-party, 0 ms blocking
PASS
21% third-party, 0 ms blocking
Info::
Third-party code accounts for 21% of page weight (480.7 KiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
79%
21%
First-party Third-party
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+
JS Execution Cost
438ms total JS execution
PASS
438ms total JS execution
Info::
https://wmo.int/core/assets/vendor/jquery/jquery.m...: 84ms CPU time
Info::
https://wmo.int/: 73ms CPU time
Info::
https://wmo.int/sites/default/files/js/js_Tm2kJcaI...: 61ms CPU time
Info::
Unattributable: 60ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-MWX...: 56ms CPU time
Warning::
Third-party scripts: 221ms (50% of total)

Main Thread Breakdown

Script Evaluation 52% Other 21% Style & Layout 16% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://wmo.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.084ms41ms1ms1st
https://wmo.int/73ms2ms0ms1st
https://wmo.int/sites/default/files/js/js_Tm2kJcaIuY7ctfvQK8t4l8XY8EcK8mW-ajujIpz__jE.js?scope=footer&delta=3&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ61ms23ms2ms1st
Unattributable60ms2ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MWXW8B256ms48ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-M3ZTFRL6FX&cx=c&gtm=4e64h153ms44ms8ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js52ms43ms2ms3rd
A+
Font Loading
3 fonts (57 KB)
PASS
3 fonts (57 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

57 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 500 ms 1.0 s 1.5 s 2.0 s FCP 577 ms LCP 2.3 shttps://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2JTUSjIg1_i6t8kCHKm459Wl... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2 — 34.7 KiB — 51 ms — font-display: swaphttps://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459W1hyyTh89ZNpQ.woff2JTUSjIg1_i6t8kCHKm459W1... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459W1hyyTh89ZNpQ.woff2 — 21.0 KiB — 42 ms — font-display: swaphttps://wmo.int/libraries/slick-carousel/slick/fonts/slick.woff2slick.woff2 https://wmo.int/libraries/slick-carousel/slick/fonts/slick.woff2 — 1.1 KiB — 5 ms — font-display: swap
JTUSjIg1_i6t8kCHKm459Wl... woff2 swap
Size 35 KB
Load time 51 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
JTUSjIg1_i6t8kCHKm459W1... woff2 swap
Size 21 KB
Load time 42 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
slick.woff2 woff2 swap
Size 1 KB
Load time 5 ms
Start 1.5 s
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
A+
HTTP Caching
max-age=1800 (30 minutes)
PASS
max-age=1800 (30 minutes)
Info::
Cache-Control header is set
Got: max-age=1800, public
Info::
Effective TTL: 30 minutes (max-age=1800)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=1800, public

DirectiveValueMeaning
max-age1800Cache for 30 minutes
public—Any cache may store this response
Effective TTL: 1800 seconds
Network Waterfall
58 requests over 2435ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 577 ms LCP 2.3 shttps://wmo.int// https://wmo.int/ — 200 — 26.3 KiB — 1.3 s — h2https://wmo.int/sites/default/files/css/css_qBV16kYwrA6Sb4Hl3zOBjlpAThM5sq5hEgHlnLg88ac.css?delta=0&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o/sites/default/files/css/css_qBV16k... https://wmo.int/sites/default/files/css/css_qBV16kYwrA6Sb4Hl3zOBjlpAThM5sq5hEgHlnLg88ac.css?delta=0&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o — 200 — 2.2 KiB — 24 ms — h2https://wmo.int/sites/default/files/css/css_ns5aJ0uhZjJ2-xP5JkiKtW-TCfMC4byGl54ugA4XP2g.css?delta=1&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o/sites/default/files/css/css_ns5aJ0... https://wmo.int/sites/default/files/css/css_ns5aJ0uhZjJ2-xP5JkiKtW-TCfMC4byGl54ugA4XP2g.css?delta=1&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o — 200 — 1.3 KiB — 30 ms — h2https://fonts.googleapis.com/css2?family=Montserrat:wght@200..700&display=swapfonts.googleapis.com/css2?family=Mo... https://fonts.googleapis.com/css2?family=Montserrat:wght@200..700&display=swap — 200 — 1.0 KiB — 84 ms — h2https://wmo.int/sites/default/files/css/css_p6inRy1qf3swiqHP1T5AB7IYSfLXM7ysJAV97bTRJY0.css?delta=3&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o/sites/default/files/css/css_p6inRy... https://wmo.int/sites/default/files/css/css_p6inRy1qf3swiqHP1T5AB7IYSfLXM7ysJAV97bTRJY0.css?delta=3&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o — 200 — 3.3 KiB — 27 ms — h2https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.cssmaxcdn.bootstrapcdn.com/font-awesom... https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css — 200 — 7.4 KiB — 56 ms — h3https://wmo.int/sites/default/files/css/css_9vNo4PZdVgz2asaIqmholULao3i14ds6WsDMzmMx0ms.css?delta=5&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o/sites/default/files/css/css_9vNo4P... https://wmo.int/sites/default/files/css/css_9vNo4PZdVgz2asaIqmholULao3i14ds6WsDMzmMx0ms.css?delta=5&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o — 200 — 22.1 KiB — 29 ms — h2https://wmo.int/sites/default/files/js/js_Zj7cV17l39XdxS1ZUDiD9HTYes2hA_i7gF42bC20ElE.js?scope=header&delta=0&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ/sites/default/files/js/js_Zj7cV17l... https://wmo.int/sites/default/files/js/js_Zj7cV17l39XdxS1ZUDiD9HTYes2hA_i7gF42bC20ElE.js?scope=header&delta=0&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ — 200 — 455 B — 31 ms — h2https://wmo.int/modules/contrib/google_tag/js/gtag.js?tdsma7/modules/contrib/google_tag/js/gtag... https://wmo.int/modules/contrib/google_tag/js/gtag.js?tdsma7 — 200 — 934 B — 24 ms — h2https://wmo.int/modules/contrib/google_tag/js/gtm.js?tdsma7/modules/contrib/google_tag/js/gtm.... https://wmo.int/modules/contrib/google_tag/js/gtm.js?tdsma7 — 200 — 845 B — 24 ms — h2https://wmo.int/sites/default/files/js/js_tPB0X5w-UvQN_62MtIjK3BwaZe6wzQdEVzf_hwmM8lY.js?scope=header&delta=3&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ/sites/default/files/js/js_tPB0X5w-... https://wmo.int/sites/default/files/js/js_tPB0X5w-UvQN_62MtIjK3BwaZe6wzQdEVzf_hwmM8lY.js?scope=header&delta=3&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ — 200 — 3.3 KiB — 21 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/logo.svg/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/logo.svg — 200 — 7.5 KiB — 27 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/logo_en.svg/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/logo_en.svg — 200 — 2.9 KiB — 29 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/cta-button-round-dark.svg/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/cta-button-round-dark.svg — 200 — 460 B — 3 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/calendar-light.svg/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/calendar-light.svg — 200 — 505 B — 3 ms — h2https://wmo.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0/core/assets/vendor/jquery/jquery.m... https://wmo.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 — 200 — 31.7 KiB — 4 ms — h2https://wmo.int/sites/default/files/js/js_5DiEVTfhWPQ-6xjpVEblnZB6oSr14VRLjB9aef9cKCU.js?scope=footer&delta=1&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ/sites/default/files/js/js_5DiEVTfh... https://wmo.int/sites/default/files/js/js_5DiEVTfhWPQ-6xjpVEblnZB6oSr14VRLjB9aef9cKCU.js?scope=footer&delta=1&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ — 200 — 18.5 KiB — 4 ms — h2https://wmo.int/sites/default/files/js/js_Tm2kJcaIuY7ctfvQK8t4l8XY8EcK8mW-ajujIpz__jE.js?scope=footer&delta=3&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ/sites/default/files/js/js_Tm2kJcaI... https://wmo.int/sites/default/files/js/js_Tm2kJcaIuY7ctfvQK8t4l8XY8EcK8mW-ajujIpz__jE.js?scope=footer&delta=3&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ — 200 — 26.3 KiB — 5 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/favicons//site.webmanifest/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/favicons//site.webmanifest — 200 — 569 B — 8 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/location-light.svg/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/location-light.svg — 200 — 530 B — 5 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/cta-button-round-light.svg/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/cta-button-round-light.svg — 200 — 399 B — 3 ms — h2https://wmo.int/themes/custom/server_theme/dist/js/gtm-opt-out.js?tdsma7/themes/custom/server_theme/dist/js... https://wmo.int/themes/custom/server_theme/dist/js/gtm-opt-out.js?tdsma7 — 200 — 420 B — 3 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-MWXW8B2www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-MWXW8B2 — 200 — 135.0 KiB — 161 ms — h2https://cdn.rollbar.com/rollbarjs/refs/tags/v2.26.3/rollbar.min.jscdn.rollbar.com/rollbarjs/refs/tags... https://cdn.rollbar.com/rollbarjs/refs/tags/v2.26.3/rollbar.min.js — 200 — 24.3 KiB — 59 ms — http/1.1https://wmo.int/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2026-03/3038%20%281%29.jpg?h=58fe2a77&itok=cTHr2oKp/sites/default/files/styles/hero_fe... https://wmo.int/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2026-03/3038%20%281%29.jpg?h=58fe2a77&itok=cTHr2oKp — 200 — 45.7 KiB — 8 ms — h2https://wmo.int/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2026-02/WMD%202026_Horizontal%20poster_CTA.png?h=197483aa&itok=hr1UK7k_/sites/default/files/styles/hero_fe... https://wmo.int/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2026-02/WMD%202026_Horizontal%20poster_CTA.png?h=197483aa&itok=hr1UK7k_ — 200 — 613.2 KiB — 23 ms — h2https://wmo.int/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2023-06/AdobeStock_599303208.jpeg?h=ac778ff2&itok=VhvCfMeV/sites/default/files/styles/hero_fe... https://wmo.int/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2023-06/AdobeStock_599303208.jpeg?h=ac778ff2&itok=VhvCfMeV — 200 — 48.2 KiB — 9 ms — h2https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2fonts.gstatic.com/s/montserrat/v31/... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2 — 200 — 34.7 KiB — 51 ms — h3https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459W1hyyTh89ZNpQ.woff2fonts.gstatic.com/s/montserrat/v31/... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459W1hyyTh89ZNpQ.woff2 — 200 — 21.0 KiB — 42 ms — h3https://wmo.int/call/ajax/controller/date_formatter/call/ajax/controller/date_formatte... https://wmo.int/call/ajax/controller/date_formatter — 200 — 308 B — 74 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 577 ms LCP 2.3 shttps://wmo.int// https://wmo.int/ — 200 — 26.3 KiB — 1.3 s — h2https://wmo.int/sites/default/files/css/css_qBV16kYwrA6Sb4Hl3zOBjlpAThM5sq5hEgHlnLg88ac.css?delta=0&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o/sites/default/files/css/css_qBV16k... https://wmo.int/sites/default/files/css/css_qBV16kYwrA6Sb4Hl3zOBjlpAThM5sq5hEgHlnLg88ac.css?delta=0&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o — 200 — 2.2 KiB — 24 ms — h2https://wmo.int/sites/default/files/css/css_ns5aJ0uhZjJ2-xP5JkiKtW-TCfMC4byGl54ugA4XP2g.css?delta=1&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o/sites/default/files/css/css_ns5aJ0... https://wmo.int/sites/default/files/css/css_ns5aJ0uhZjJ2-xP5JkiKtW-TCfMC4byGl54ugA4XP2g.css?delta=1&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o — 200 — 1.3 KiB — 30 ms — h2https://fonts.googleapis.com/css2?family=Montserrat:wght@200..700&display=swapfonts.googleapis.com/css2?family=Mo... https://fonts.googleapis.com/css2?family=Montserrat:wght@200..700&display=swap — 200 — 1.0 KiB — 84 ms — h2https://wmo.int/sites/default/files/css/css_p6inRy1qf3swiqHP1T5AB7IYSfLXM7ysJAV97bTRJY0.css?delta=3&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o/sites/default/files/css/css_p6inRy... https://wmo.int/sites/default/files/css/css_p6inRy1qf3swiqHP1T5AB7IYSfLXM7ysJAV97bTRJY0.css?delta=3&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o — 200 — 3.3 KiB — 27 ms — h2https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.cssmaxcdn.bootstrapcdn.com/font-awesom... https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css — 200 — 7.4 KiB — 56 ms — h3https://wmo.int/sites/default/files/css/css_9vNo4PZdVgz2asaIqmholULao3i14ds6WsDMzmMx0ms.css?delta=5&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o/sites/default/files/css/css_9vNo4P... https://wmo.int/sites/default/files/css/css_9vNo4PZdVgz2asaIqmholULao3i14ds6WsDMzmMx0ms.css?delta=5&language=en&theme=server_theme&include=eJxVj1EOwjAMQy_U0iNVYQ1bWZqgJLCN09NpgLQ_-9mOlIHAbEtXMAzDoVlK16KYij4fQBe4w3oAFm1A9Y0BV6fK86_ytYGAx1xUHkUWTruLPxdvfRwM9YWafcKG6SbsERY0aXhORpIrUDTf-tnxnLW-6kDBz9yoDnOw6rjUghkI1VPl2mubObbjySeXMRsSDl6Fs02gqGmn8U_jQT-rBG9o — 200 — 22.1 KiB — 29 ms — h2https://wmo.int/sites/default/files/js/js_Zj7cV17l39XdxS1ZUDiD9HTYes2hA_i7gF42bC20ElE.js?scope=header&delta=0&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ/sites/default/files/js/js_Zj7cV17l... https://wmo.int/sites/default/files/js/js_Zj7cV17l39XdxS1ZUDiD9HTYes2hA_i7gF42bC20ElE.js?scope=header&delta=0&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ — 200 — 455 B — 31 ms — h2https://wmo.int/modules/contrib/google_tag/js/gtag.js?tdsma7/modules/contrib/google_tag/js/gtag... https://wmo.int/modules/contrib/google_tag/js/gtag.js?tdsma7 — 200 — 934 B — 24 ms — h2https://wmo.int/modules/contrib/google_tag/js/gtm.js?tdsma7/modules/contrib/google_tag/js/gtm.... https://wmo.int/modules/contrib/google_tag/js/gtm.js?tdsma7 — 200 — 845 B — 24 ms — h2https://wmo.int/sites/default/files/js/js_tPB0X5w-UvQN_62MtIjK3BwaZe6wzQdEVzf_hwmM8lY.js?scope=header&delta=3&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ/sites/default/files/js/js_tPB0X5w-... https://wmo.int/sites/default/files/js/js_tPB0X5w-UvQN_62MtIjK3BwaZe6wzQdEVzf_hwmM8lY.js?scope=header&delta=3&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ — 200 — 3.3 KiB — 21 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/logo.svg/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/logo.svg — 200 — 7.5 KiB — 27 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/logo_en.svg/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/logo_en.svg — 200 — 2.9 KiB — 29 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/cta-button-round-dark.svg/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/cta-button-round-dark.svg — 200 — 460 B — 3 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/calendar-light.svg/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/calendar-light.svg — 200 — 505 B — 3 ms — h2https://wmo.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0/core/assets/vendor/jquery/jquery.m... https://wmo.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 — 200 — 31.7 KiB — 4 ms — h2https://wmo.int/sites/default/files/js/js_5DiEVTfhWPQ-6xjpVEblnZB6oSr14VRLjB9aef9cKCU.js?scope=footer&delta=1&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ/sites/default/files/js/js_5DiEVTfh... https://wmo.int/sites/default/files/js/js_5DiEVTfhWPQ-6xjpVEblnZB6oSr14VRLjB9aef9cKCU.js?scope=footer&delta=1&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ — 200 — 18.5 KiB — 4 ms — h2https://wmo.int/sites/default/files/js/js_Tm2kJcaIuY7ctfvQK8t4l8XY8EcK8mW-ajujIpz__jE.js?scope=footer&delta=3&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ/sites/default/files/js/js_Tm2kJcaI... https://wmo.int/sites/default/files/js/js_Tm2kJcaIuY7ctfvQK8t4l8XY8EcK8mW-ajujIpz__jE.js?scope=footer&delta=3&language=en&theme=server_theme&include=eJxdzlEOgzAIgOELteuRGmxZZWJpKE6z00_jtsS9kPwfPICbMdUpZF0a8A3PdEWkMEaDEso-_vsGD9iuODuGWmJWaVnWGo7y3_J30dmpMA-gobAMwK6jPlGjjTjjx3xPSs36dceSgOmF2Wcw9EYzXg8aKDDvH120M6XJdTJcKWMERrVAlcwtNZfYkTEZSY19BEUNh_qf-lPfP1pwhQ — 200 — 26.3 KiB — 5 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/favicons//site.webmanifest/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/favicons//site.webmanifest — 200 — 569 B — 8 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/location-light.svg/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/location-light.svg — 200 — 530 B — 5 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/cta-button-round-light.svg/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/cta-button-round-light.svg — 200 — 399 B — 3 ms — h2https://wmo.int/themes/custom/server_theme/dist/js/gtm-opt-out.js?tdsma7/themes/custom/server_theme/dist/js... https://wmo.int/themes/custom/server_theme/dist/js/gtm-opt-out.js?tdsma7 — 200 — 420 B — 3 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-MWXW8B2www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-MWXW8B2 — 200 — 135.0 KiB — 161 ms — h2https://cdn.rollbar.com/rollbarjs/refs/tags/v2.26.3/rollbar.min.jscdn.rollbar.com/rollbarjs/refs/tags... https://cdn.rollbar.com/rollbarjs/refs/tags/v2.26.3/rollbar.min.js — 200 — 24.3 KiB — 59 ms — http/1.1https://wmo.int/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2026-03/3038%20%281%29.jpg?h=58fe2a77&itok=cTHr2oKp/sites/default/files/styles/hero_fe... https://wmo.int/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2026-03/3038%20%281%29.jpg?h=58fe2a77&itok=cTHr2oKp — 200 — 45.7 KiB — 8 ms — h2https://wmo.int/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2026-02/WMD%202026_Horizontal%20poster_CTA.png?h=197483aa&itok=hr1UK7k_/sites/default/files/styles/hero_fe... https://wmo.int/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2026-02/WMD%202026_Horizontal%20poster_CTA.png?h=197483aa&itok=hr1UK7k_ — 200 — 613.2 KiB — 23 ms — h2https://wmo.int/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2023-06/AdobeStock_599303208.jpeg?h=ac778ff2&itok=VhvCfMeV/sites/default/files/styles/hero_fe... https://wmo.int/sites/default/files/styles/hero_featured_content_x1_760x440_/public/2023-06/AdobeStock_599303208.jpeg?h=ac778ff2&itok=VhvCfMeV — 200 — 48.2 KiB — 9 ms — h2https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2fonts.gstatic.com/s/montserrat/v31/... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2 — 200 — 34.7 KiB — 51 ms — h3https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459W1hyyTh89ZNpQ.woff2fonts.gstatic.com/s/montserrat/v31/... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459W1hyyTh89ZNpQ.woff2 — 200 — 21.0 KiB — 42 ms — h3https://wmo.int/call/ajax/controller/date_formatter/call/ajax/controller/date_formatte... https://wmo.int/call/ajax/controller/date_formatter — 200 — 308 B — 74 ms — h2https://wmo.int/call/ajax/controller/date_formatter/call/ajax/controller/date_formatte... https://wmo.int/call/ajax/controller/date_formatter — 200 — 261 B — 79 ms — h2https://wmo.int/call/ajax/controller/date_formatter/call/ajax/controller/date_formatte... https://wmo.int/call/ajax/controller/date_formatter — 200 — 397 B — 107 ms — h2https://wmo.int/sitewide_alert/load/sitewide_alert/load https://wmo.int/sitewide_alert/load — 200 — 418 B — 47 ms — h2https://wmo.int/sites/default/files/styles/full_width_large_image/public/2026-04/WMO%20-%20Marius%20Kunigiskis.jpg?h=f147d2d1&itok=R5Fzut3r/sites/default/files/styles/full_wi... https://wmo.int/sites/default/files/styles/full_width_large_image/public/2026-04/WMO%20-%20Marius%20Kunigiskis.jpg?h=f147d2d1&itok=R5Fzut3r — 200 — 266.4 KiB — 10 ms — h2https://wmo.int/sites/default/files/styles/full_width_large_image/public/2026-04/Bangladesh%20flooding%20-%20WMO%3BHossain.jpg?h=a1e1a043&itok=Nad_syed/sites/default/files/styles/full_wi... https://wmo.int/sites/default/files/styles/full_width_large_image/public/2026-04/Bangladesh%20flooding%20-%20WMO%3BHossain.jpg?h=a1e1a043&itok=Nad_syed — 200 — 456.4 KiB — 19 ms — h2https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-03/jamaica-hurricane-melissa.jpg?h=1de6ea3f&itok=ANTUqYg1/sites/default/files/styles/teaser_... https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-03/jamaica-hurricane-melissa.jpg?h=1de6ea3f&itok=ANTUqYg1 — 200 — 34.5 KiB — 24 ms — h2https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-04/48043955127_a57e8b7f04_o_0.jpg?h=c703677a&itok=F2APTfMn/sites/default/files/styles/teaser_... https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-04/48043955127_a57e8b7f04_o_0.jpg?h=c703677a&itok=F2APTfMn — 200 — 20.1 KiB — 17 ms — h2https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-04/15811212578_c97dbe522c_o.jpg?h=6c40f552&itok=YgupjTA2/sites/default/files/styles/teaser_... https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-04/15811212578_c97dbe522c_o.jpg?h=6c40f552&itok=YgupjTA2 — 200 — 16.7 KiB — 21 ms — h2https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-04/HFxc_3gXYAA8q0h.jpg?h=b69e0e0e&itok=VzQerfJ7/sites/default/files/styles/teaser_... https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-04/HFxc_3gXYAA8q0h.jpg?h=b69e0e0e&itok=VzQerfJ7 — 200 — 24.6 KiB — 25 ms — h2https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-03/54475480915_d1d7407797_o.jpg?h=4e267cbf&itok=eQxgPK6O/sites/default/files/styles/teaser_... https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-03/54475480915_d1d7407797_o.jpg?h=4e267cbf&itok=eQxgPK6O — 200 — 28.5 KiB — 18 ms — h2https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-03/54598057656_7a050809a3_o.jpg?h=a141e9ea&itok=pcGNMKM-/sites/default/files/styles/teaser_... https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-03/54598057656_7a050809a3_o.jpg?h=a141e9ea&itok=pcGNMKM- — 200 — 34.6 KiB — 27 ms — h2https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-03/ina-ndeye-fatou-thiam-senegal-matam.jpg?h=82f92a78&itok=5K30ufHA/sites/default/files/styles/teaser_... https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-03/ina-ndeye-fatou-thiam-senegal-matam.jpg?h=82f92a78&itok=5K30ufHA — 200 — 30.3 KiB — 24 ms — h2https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-03/53155598148_6b495c31ec_o.jpg?h=fa1c963e&itok=s_vPJcXw/sites/default/files/styles/teaser_... https://wmo.int/sites/default/files/styles/teaser_1x/public/2026-03/53155598148_6b495c31ec_o.jpg?h=fa1c963e&itok=s_vPJcXw — 200 — 27.7 KiB — 24 ms — h2https://wmo.int/libraries/slick-carousel/slick/ajax-loader.gif/libraries/slick-carousel/slick/aja... https://wmo.int/libraries/slick-carousel/slick/ajax-loader.gif — 200 — 2.8 KiB — 23 ms — h2https://wmo.int/libraries/slick-carousel/slick/fonts/slick.woff2/libraries/slick-carousel/slick/fon... https://wmo.int/libraries/slick-carousel/slick/fonts/slick.woff2 — 200 — 1.1 KiB — 5 ms — h2https://www.clarity.ms/tag/k6cqa825se?ref=gtmwww.clarity.ms/tag/k6cqa825se?ref=g... https://www.clarity.ms/tag/k6cqa825se?ref=gtm — 200 — 843 B — 120 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-M3ZTFRL6FX&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-M3ZTFRL6FX&cx=c&gtm=4e64h1 — 200 — 158.6 KiB — 57 ms — h2https://static.hotjar.com/c/hotjar-3386775.js?sv=7static.hotjar.com/c/hotjar-3386775.... https://static.hotjar.com/c/hotjar-3386775.js?sv=7 — 200 — 6.2 KiB — 82 ms — h2https://static.hotjar.com/c/hotjar-3386775.js?sv=6static.hotjar.com/c/hotjar-3386775.... https://static.hotjar.com/c/hotjar-3386775.js?sv=6 — 200 — 6.2 KiB — 80 ms — h2https://region1.analytics.google.com/g/collect?v=2&tid=G-M3ZTFRL6FX&gtm=45je64h1v896551750z8896543297za20gzb896543297zd896543297&_p=1776806412078&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&are=1&cid=646196213.1776806412&frm=0&pscdl=noapi&rcb=11&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~117384405&sid=1776806412&sct=1&seg=0&dl=https%3A%2F%2Fwmo.int%2F&dt=Homepage%20%7C%20World%20Meteorological%20Organization%20WMO&en=page_view&_fv=2&_nsi=1&_ss=1&_c=1&tfd=1713region1.analytics.google.com/g/coll... https://region1.analytics.google.com/g/collect?v=2&tid=G-M3ZTFRL6FX&gtm=45je64h1v896551750z8896543297za20gzb896543297zd896543297&_p=1776806412078&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&are=1&cid=646196213.1776806412&frm=0&pscdl=noapi&rcb=11&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~117384405&sid=1776806412&sct=1&seg=0&dl=https%3A%2F%2Fwmo.int%2F&dt=Homepage%20%7C%20World%20Meteorological%20Organization%20WMO&en=page_view&_fv=2&_nsi=1&_ss=1&_c=1&tfd=1713 — 204 — 543 B — 118 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-M3ZTFRL6FX&cid=646196213.1776806412&gtm=45je64h1v896551750z8896543297za20gzb896543297zd896543297&rcb=11&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938465~115938469~117266401~117384405stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-M3ZTFRL6FX&cid=646196213.1776806412&gtm=45je64h1v896551750z8896543297za20gzb896543297zd896543297&rcb=11&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938465~115938469~117266401~117384405 — 204 — 552 B — 69 ms — h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-M3ZTFRL6FX&cid=646196213.1776806412&gtm=45je64h1v896551750z8896543297za20gzb896543297zd896543297&rcb=11&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938465~115938469~117266401~117384405&z=441311283www.google.es/ads/ga-audiences?v=1&... https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-M3ZTFRL6FX&cid=646196213.1776806412&gtm=45je64h1v896551750z8896543297za20gzb896543297zd896543297&rcb=11&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938465~115938469~117266401~117384405&z=441311283 — 200 — 408 B — 74 ms — h2https://script.hotjar.com/modules.6a0f3932cb1341a35c18.jsscript.hotjar.com/modules.6a0f3932c... https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js — 200 — 56.6 KiB — 73 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 — 124 ms — h2https://www.clarity.ms/tag/k6cqa825se?ref=gtmwww.clarity.ms/tag/k6cqa825se?ref=g... https://www.clarity.ms/tag/k6cqa825se?ref=gtm — 200 — 843 B — 29 ms — http/1.1https://region1.analytics.google.com/g/collect?v=2&tid=G-M3ZTFRL6FX&gtm=45je64h1v896551750z8896543297za20gzb896543297zd896543297&_p=1776806412078&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&gdid=dMDhkMT&_eu=AAAAAGQ&are=1&cid=646196213.1776806412&frm=0&pscdl=noapi&rcb=11&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=2&tag_exp=0~115938465~115938469~117266401~117384405&sid=1776806412&sct=1&seg=0&dl=https%3A%2F%2Fwmo.int%2F&dt=Homepage%20%7C%20World%20Meteorological%20Organization%20WMO&en=scroll&_c=1&epn.scroll_depth=10&_et=192&tfd=1906region1.analytics.google.com/g/coll... https://region1.analytics.google.com/g/collect?v=2&tid=G-M3ZTFRL6FX&gtm=45je64h1v896551750z8896543297za20gzb896543297zd896543297&_p=1776806412078&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&gdid=dMDhkMT&_eu=AAAAAGQ&are=1&cid=646196213.1776806412&frm=0&pscdl=noapi&rcb=11&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=2&tag_exp=0~115938465~115938469~117266401~117384405&sid=1776806412&sct=1&seg=0&dl=https%3A%2F%2Fwmo.int%2F&dt=Homepage%20%7C%20World%20Meteorological%20Organization%20WMO&en=scroll&_c=1&epn.scroll_depth=10&_et=192&tfd=1906 — 204 — 48 B — 31 ms — h2https://wmo.int/themes/custom/server_theme/dist/images/favicons//favicon-32x32.png/themes/custom/server_theme/dist/im... https://wmo.int/themes/custom/server_theme/dist/images/favicons//favicon-32x32.png — 200 — 2.5 KiB — 4 ms — h2https://j.clarity.ms/collectj.clarity.ms/collect https://j.clarity.ms/collect — 204 — 271 B — 471 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
50% of JavaScript execution is third-party
First-party Third-party 221ms · 320KB · €2/mo
Unattributable
Other
Optional
Execution 60ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 56ms
Transfer 135 KB
Unused 46%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 53ms
Transfer 159 KB
Unused 41%
Monthly Cost €1/mo
Microsoft Clarity
Session Replay
Optional
Execution 52ms
Transfer 26 KB
Monthly Cost €1/mo

50% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

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.

Send Feedback