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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
1
REVIEW
5
PASS
9
INFO
2

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

Mobile Desktop
63
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.

2.01 s

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

15.56 s

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

248 ms

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

0.000

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

5.93 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.

18.01 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
17
9 PASS 5 REVIEW 1 FIX
F
Page Weight Budget
Action
4.4 MB transferred, 59 requests
FIX
4.4 MB transferred, 59 requests
Critical::
Page weighs 5.6 MB (4.4 MB transferred)
Warning::
Images are 3.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.8 MB
Info::
59 HTTP requests
Info::
Estimated 0.92 g CO2 per page load
4.4 MB / 2.4 MB budget
4.4 MB transferred
59 requests
0.92 g CO2 per page load
Images 3.8 MiB 86%
JavaScript 496.6 KiB 11%
Fonts 56.8 KiB 1%
CSS 37.2 KiB 1%
HTML 26.3 KiB 1%
Other 2.6 KiB 0%
Other 1.1 KiB 0%
Other 981 B 0%
Other 570 B 0%
Other 543 B 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

C
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 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.
22 images 3.8 MB
0 oversized -0 KB
22 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 Execution Cost
Action
1823ms total JS execution
REVIEW
1823ms total JS execution
Warning::
https://wmo.int/: 361ms CPU time
Warning::
Unattributable: 308ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MWX...: 252ms CPU time
Info::
https://wmo.int/core/assets/vendor/jquery/jquery.m...: 241ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-M3ZT...: 239ms CPU time
Warning::
Third-party scripts: 1134ms (62% of total)

Main Thread Breakdown

Script Evaluation 51% Other 21% Style & Layout 15% Script Parsing & Compilation 7% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://wmo.int/361ms6ms0ms1st
Unattributable308ms9ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MWXW8B2252ms215ms33ms3rd
https://wmo.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0241ms122ms6ms1st
https://www.googletagmanager.com/gtag/js?id=G-M3ZTFRL6FX&cx=c&gtm=4e64k0h2239ms198ms39ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js210ms193ms8ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js125ms103ms18ms3rd
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-lPfP1pwhQ87ms72ms4ms1st
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=4e64k0h2158 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
59 resources · 4.4 MB · 165 KB savings available
REVIEW
59 resources · 4.4 MB · 165 KB savings available
Warning::
Page weight 3.4 MB over 1MB target
Got: 4.4 MB Expected: ≤ 1 MB
Info::
~165 KB of savings available
Info::
18 third-party resources (11% of weight)
Info::
3 resources over 200KB
59 resources · 4.4 MiB · 18 third-party 3.4 MiB over 1MB target
Image 86% · 3.8 MiB
JavaScript 11% · 496.6 KiB
Font 1% · 56.8 KiB
CSS 1% · 37.2 KiB
Document 1% · 26.3 KiB
Other 0% · 3.2 KiB

~165.3 KiB of savings available

Remove unused JavaScript: 165.3 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
11% third-party, 0 ms blocking
PASS
11% third-party, 0 ms blocking
Info::
Third-party code accounts for 11% of page weight (480.2 KiB of 4.4 MiB)
Info::
Third-party blocking time is low (0 ms)
89%
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+
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 2.0 s LCP 15.6 shttps://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2JTUSjIg1_i6t8kCHKm459Wl... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2 — 34.7 KiB — 50 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 — 34 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 — 4 ms — font-display: swap
JTUSjIg1_i6t8kCHKm459Wl... woff2 swap
Size 35 KB
Load time 50 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
JTUSjIg1_i6t8kCHKm459W1... woff2 swap
Size 21 KB
Load time 34 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
slick.woff2 woff2 swap
Size 1 KB
Load time 4 ms
Start 1.7 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+
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+
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
59 requests over 2739ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 2.0 s LCP 15.6 shttps://wmo.int// https://wmo.int/ — 200 — 26.3 KiB — 1.4 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 — 2.1 KiB — 9 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 — 1.2 KiB — 14 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 — 95 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 — 12 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 — 87 ms — 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271 B — 452 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
62% of JavaScript execution is third-party
First-party Third-party 1134ms · 376KB · €12/mo
Unattributable
Other
Costly
Execution 308ms
Transfer 0 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 252ms
Transfer 135 KB
Unused 46%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 239ms
Transfer 158 KB
Unused 41%
Monthly Cost €3/mo
Microsoft Clarity
Session Replay
Costly
Execution 210ms
Transfer 26 KB
Monthly Cost €2/mo
Hotjar
Session Replay
Optional
Execution 125ms
Transfer 57 KB
Unused 67%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 308ms and costs ~€3/month
  • Google Tag Manager adds 252ms and costs ~€3/month
  • Google Tag Manager adds 239ms and costs ~€3/month
  • Microsoft Clarity adds 210ms and costs ~€2/month

62% 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

Unattributable takes 308ms 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 252ms 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 239ms 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 210ms 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

67% of Hotjar'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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