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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
77
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
75
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

1.79 s

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

2.36 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.

0.003

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

2.29 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.

2.36 s

Page Load Progression

393 ms
785 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.7 s
3.1 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
3.3 MB transferred, 115 requests
FIX
3.3 MB transferred, 115 requests
Warning::
Page weighs 4.9 MB (3.3 MB transferred)
Warning::
Images are 2.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.5 MB
Warning::
JavaScript is 554 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 554 KB
Warning::
115 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.70 g CO2 per page load
3.3 MB / 2.4 MB budget
3.3 MB transferred
115 requests
0.70 g CO2 per page load
Images 2.5 MiB 75%
JavaScript 553.9 KiB 16%
CSS 145.7 KiB 4%
Fonts 100.8 KiB 3%
HTML 18.5 KiB 1%
Other 14.0 KiB 0%
Other 2.3 KiB 0%
Other 453 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

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.3 MiB of 3.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
115 resources · 3.3 MB · 200 KB savings available
FIX
115 resources · 3.3 MB · 200 KB savings available
Warning::
Page weight 2.3 MB over 1MB target
Got: 3.3 MB Expected: ≤ 1 MB
Info::
~200 KB of savings available
Warning::
114 third-party resources (100% of weight)
115 resources · 3.3 MiB · 114 third-party 2.3 MiB over 1MB target
Image 76% · 2.5 MiB
JavaScript 16% · 553.9 KiB
CSS 4% · 145.7 KiB
Font 3% · 100.8 KiB
Document 1% · 18.8 KiB
Other 0% · 14.4 KiB

~199.5 KiB of savings available

Remove unused JavaScript: 199.5 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
68 images, 0 KB saveable
REVIEW
68 images, 0 KB saveable
Warning::
https://www.iarc.who.int/wp-content/themes/iarc-th... 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.
68 images 2.5 MB
0 oversized -0 KB
65 legacy format
2 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

Performance issues directly impact user engagement and conversion rates.

B
JS Execution Cost
552ms total JS execution
REVIEW
552ms total JS execution
Info::
https://www.iarc.who.int/: 183ms CPU time
Info::
Unattributable: 159ms CPU time
Info::
https://www.iarc.who.int/wp-content/themes/iarc-th...: 130ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-END5...: 80ms CPU time
Warning::
Third-party scripts: 552ms (100% of total)

Main Thread Breakdown

Script Evaluation 37% Other 29% Style & Layout 20% Script Parsing & Compilation 7% Rendering 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.iarc.who.int/183ms27ms1ms3rd
Unattributable159ms2ms0ms3rd
https://www.iarc.who.int/wp-content/themes/iarc-theme-new/js/jquery-3.3.1.min.js?ver=5.3.2130ms84ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-END57GKPMR80ms61ms16ms3rd
C
JS Bundles
Action
22 scripts, 200 KB unused
REVIEW
22 scripts, 200 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PQ9...: 73 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-END5...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.iarc.who.int/wp-content/themes/iarc-th...: 34 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.iarc.who.int/wp-includes/js/jquery/jqu...: 26 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 200 KB
200 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-PQ9TBQ4132 KB73 KB (55%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-END57GKPMR158 KB66 KB (42%)✓3rd
https://www.iarc.who.int/wp-content/themes/iarc-theme-new/js/swiper.min.js?ver=5.3.239 KB34 KB (88%)✓3rd
https://www.iarc.who.int/wp-includes/js/jquery/jquery.js?ver=1.12.4-wp39 KB26 KB (68%)✓3rd
https://www.iarc.who.int/wp-content/themes/iarc-theme-new/js/popper.min.js?ver=5.3.28 KB—✓3rd
https://www.iarc.who.int/wp-includes/js/jquery/jquery-migrate.min.js?ver=1.4.15 KB—✓3rd
https://www.iarc.who.int/wp-content/themes/iarc-theme-new/js/skip-link-focus-fix.js?ver=201512151 KB—✓3rd
https://www.iarc.who.int/wp-content/themes/iarc-theme-new/js/chosen.min.js?ver=5.3.28 KB—✓3rd
https://www.iarc.who.int/wp-content/themes/iarc-theme-new/js/mCustomScrollbar.min.js?ver=5.3.214 KB—✓3rd
https://www.iarc.who.int/wp-content/themes/iarc-theme-new/js/tether.min.js?ver=5.3.29 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

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

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
3 fonts (101 KB)
PASS
3 fonts (101 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

101 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 1.8 s LCP 2.4 shttps://www.iarc.who.int/wp-content/themes/iarc-theme-new/fonts/Object-Sans-400.woffObject-Sans-400.woff https://www.iarc.who.int/wp-content/themes/iarc-theme-new/fonts/Object-Sans-400.woff — 33.5 KiB — 1.2 s — font-display: swaphttps://www.iarc.who.int/wp-content/themes/iarc-theme-new/fonts/Object-Sans-700.woffObject-Sans-700.woff https://www.iarc.who.int/wp-content/themes/iarc-theme-new/fonts/Object-Sans-700.woff — 61.5 KiB — 1.2 s — font-display: swaphttps://www.iarc.who.int/wp-content/themes/iarc-theme-new/fonts/icomoon.ttficomoon.ttf https://www.iarc.who.int/wp-content/themes/iarc-theme-new/fonts/icomoon.ttf — 5.8 KiB — 1.2 s — font-display: swap
Object-Sans-400.woff woff swap
Size 33 KB
Load time 1.2 s
Start 841 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Object-Sans-700.woff woff swap
Size 62 KB
Load time 1.2 s
Start 841 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
icomoon.ttf ttf swap
Size 6 KB
Load time 1.2 s
Start 842 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~30 KB and ~60 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
Network Waterfall
115 requests over 2246ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.8 s LCP 2.4 shttps://iarc.fr// https://iarc.fr/ — 303 — 267 B — 124 ms — http/1.1https://www.iarc.who.int/www.iarc.who.int/ https://www.iarc.who.int/ — 200 — 18.5 KiB — 484 ms — h2https://www.googletagmanager.com/gtag/js?id=G-END57GKPMRwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-END57GKPMR — 200 — 157.7 KiB — 175 ms — h2https://www.iarc.who.int/wp-includes/css/dist/block-library/style.min.css?ver=5.3.2www.iarc.who.int/wp-includes/css/di... https://www.iarc.who.int/wp-includes/css/dist/block-library/style.min.css?ver=5.3.2 — 200 — 7.8 KiB — 78 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/chosen.css?ver=5.3.2www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/chosen.css?ver=5.3.2 — 200 — 3.4 KiB — 56 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/mCustomScrollbar.min.css?ver=5.3.2www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/mCustomScrollbar.min.css?ver=5.3.2 — 200 — 5.8 KiB — 39 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/bootstrap.min.css?ver=5.3.2www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/bootstrap.min.css?ver=5.3.2 — 200 — 27.8 KiB — 90 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/slick.css?ver=5.3.2www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/slick.css?ver=5.3.2 — 200 — 1.0 KiB — 78 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/slick-theme.css?ver=5.3.2www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/slick-theme.css?ver=5.3.2 — 200 — 1.4 KiB — 81 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/icomoon.css?ver=5.3.2www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/icomoon.css?ver=5.3.2 — 200 — 1.1 KiB — 83 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/swiper.min.css?ver=5.3.2www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/swiper.min.css?ver=5.3.2 — 200 — 4.0 KiB — 73 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/cookieconsent.min.css?ver=5.3.2www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/cookieconsent.min.css?ver=5.3.2 — 200 — 2.4 KiB — 81 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/simplelightbox.min.css?ver=5.3.2www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/simplelightbox.min.css?ver=5.3.2 — 200 — 1.3 KiB — 78 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/style.css?ver=5.3.2www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/style.css?ver=5.3.2 — 200 — 667 B — 51 ms — h2https://www.iarc.who.int/wp-content/plugins/google-analytics-dashboard-for-wp/assets/js/frontend.min.js?ver=6.0.2www.iarc.who.int/wp-content/plugins... https://www.iarc.who.int/wp-content/plugins/google-analytics-dashboard-for-wp/assets/js/frontend.min.js?ver=6.0.2 — 200 — 3.3 KiB — 62 ms — h2https://www.iarc.who.int/wp-includes/js/jquery/jquery.js?ver=1.12.4-wpwww.iarc.who.int/wp-includes/js/jqu... https://www.iarc.who.int/wp-includes/js/jquery/jquery.js?ver=1.12.4-wp — 200 — 39.0 KiB — 94 ms — h2https://www.iarc.who.int/wp-includes/js/jquery/jquery-migrate.min.js?ver=1.4.1www.iarc.who.int/wp-includes/js/jqu... https://www.iarc.who.int/wp-includes/js/jquery/jquery-migrate.min.js?ver=1.4.1 — 200 — 4.6 KiB — 84 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/images/layout/logo.svgwww.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/images/layout/logo.svg — 200 — 21.1 KiB — 90 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/images/layout/logo-white.svgwww.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/images/layout/logo-white.svg — 200 — 21.1 KiB — 114 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/base-new.csswww.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/base-new.css — 200 — 34.0 KiB — 76 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/header-vertical.csswww.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/header-vertical.css — 200 — 2.7 KiB — 58 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/header-home-page.csswww.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/header-home-page.css — 200 — 1.6 KiB — 49 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/responsive.csswww.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/responsive.css — 200 — 7.8 KiB — 47 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/print.csswww.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/print.css — 200 — 1.4 KiB — 54 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/new-design.csswww.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/new-design.css — 200 — 41.5 KiB — 81 ms — h2https://www.iarc.who.int/wp-content/uploads/2026/03/Banner_homepage-World-Health-Day-2026.jpgwww.iarc.who.int/wp-content/uploads... https://www.iarc.who.int/wp-content/uploads/2026/03/Banner_homepage-World-Health-Day-2026.jpg — 200 — 138.2 KiB — 106 ms — h2https://www.iarc.who.int/wp-content/uploads/2026/03/homepage_banner_141.jpgwww.iarc.who.int/wp-content/uploads... https://www.iarc.who.int/wp-content/uploads/2026/03/homepage_banner_141.jpg — 200 — 159.5 KiB — 86 ms — h2https://www.iarc.who.int/wp-content/uploads/2026/02/cytoST_IARC-homepage.jpgwww.iarc.who.int/wp-content/uploads... https://www.iarc.who.int/wp-content/uploads/2026/02/cytoST_IARC-homepage.jpg — 200 — 118.8 KiB — 1.3 s — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/js/jquery-3.3.1.min.js?ver=5.3.2www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/js/jquery-3.3.1.min.js?ver=5.3.2 — 200 — 35.0 KiB — 1.2 s — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/js/navigation.js?ver=20151215www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/js/navigation.js?ver=20151215 — 200 — 1.6 KiB — 1.1 s — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.8 s LCP 2.4 shttps://iarc.fr// https://iarc.fr/ — 303 — 267 B — 124 ms — http/1.1https://www.iarc.who.int/www.iarc.who.int/ https://www.iarc.who.int/ — 200 — 18.5 KiB — 484 ms — h2https://www.googletagmanager.com/gtag/js?id=G-END57GKPMRwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-END57GKPMR — 200 — 157.7 KiB — 175 ms — h2https://www.iarc.who.int/wp-includes/css/dist/block-library/style.min.css?ver=5.3.2www.iarc.who.int/wp-includes/css/di... https://www.iarc.who.int/wp-includes/css/dist/block-library/style.min.css?ver=5.3.2 — 200 — 7.8 KiB — 78 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/chosen.css?ver=5.3.2www.iarc.who.int/wp-content/themes/... https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/chosen.css?ver=5.3.2 — 200 — 3.4 KiB — 56 ms — h2https://www.iarc.who.int/wp-content/themes/iarc-theme-new/css/mCustomScrollbar.min.css?ver=5.3.2www.iarc.who.int/wp-content/themes/... 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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 552ms · 211KB · €6/mo
www.iarc.who.int
Other
Optional
Execution 183ms
Transfer 19 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 159ms
Transfer 0 KB
Monthly Cost €2/mo
www.iarc.who.int
Other
Optional
Execution 130ms
Transfer 35 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 80ms
Transfer 158 KB
Unused 42%
Monthly Cost €1/mo

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

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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