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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
3
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
72
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
83
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.

2.00 s

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

10.12 s

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

130 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.

2.82 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.

10.54 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
7 PASS 5 REVIEW 3 FIX
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 (1.6 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
37 resources · 1.6 MB · 111 KB savings available
FIX
37 resources · 1.6 MB · 111 KB savings available
Warning::
Page weight 644 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~111 KB of savings available
Warning::
36 third-party resources (100% of weight)
Info::
2 resources over 200KB
37 resources · 1.6 MiB · 36 third-party 644.0 KiB over 1MB target
JavaScript 54% · 894.2 KiB
Image 38% · 641.1 KiB
Font 4% · 59.9 KiB
CSS 3% · 42.0 KiB
Document 2% · 29.6 KiB
Other 0% · 1.3 KiB

~110.8 KiB of savings available

Remove unused JavaScript: 110.8 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
Page Weight Budget
Action
1.6 MB transferred, 37 requests
REVIEW
1.6 MB transferred, 37 requests
Info::
Page weighs 3.6 MB (1.6 MB transferred)
Warning::
JavaScript is 894 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 894 KB
Info::
37 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
37 requests
0.34 g CO2 per page load
JavaScript 894.2 KiB 54%
Images 637.1 KiB 38%
Fonts 59.9 KiB 4%
CSS 42.0 KiB 3%
HTML 29.6 KiB 2%
Other 4.3 KiB 0%
Other 546 B 0%
Other 546 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
Image Optimization
Action
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cbd.int/sites/default/files/styles/upd... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cbd.int/sites/default/files/styles/max... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cbd.int/themes/custom/bootstrap_sass/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 637 KB
0 oversized -0 KB
18 legacy format
4 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
1019ms total JS execution
REVIEW
1019ms total JS execution
Warning::
Unattributable: 306ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-7S1T...: 234ms CPU time
Info::
https://www.cbd.int/: 194ms CPU time
Info::
https://use.fontawesome.com/releases/v6.1.0/js/all...: 181ms CPU time
Info::
https://www.cbd.int/sites/default/files/js/js_J2lu...: 53ms CPU time
Warning::
Third-party scripts: 1019ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Other 26% Script Parsing & Compilation 17% Style & Layout 11% Garbage Collection 4% Rendering 3% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable306ms7ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7S1TPRE7F5234ms191ms38ms3rd
https://www.cbd.int/194ms9ms1ms3rd
https://use.fontawesome.com/releases/v6.1.0/js/all.js181ms53ms127ms3rd
https://www.cbd.int/sites/default/files/js/js_J2luA5l_SDJmmdm7wO88tRni8LgRRzEK-rIE7Lz7fhY.js53ms30ms6ms3rd
https://www.cbd.int/sites/default/files/js/js_J_7eOZCJhiAHj9BV-dkmpAi2kFpcDPm-szQUzRvoXoA.js50ms42ms7ms3rd
B
JS Bundles
8 scripts, 111 KB unused
REVIEW
8 scripts, 111 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7S1T...: 69 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.cbd.int/sites/default/files/js/js_fQZX...: 22 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.cbd.int/sites/default/files/js/js_J_7e...: 21 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 111 KB
111 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-7S1TPRE7F5176 KB69 KB (39%)✓3rd
https://www.cbd.int/sites/default/files/js/js_fQZXcYZFBKPW0gks83W9qL4omu9dK1iY9rZLgwCe_0s.js28 KB22 KB (78%)✓3rd
https://www.cbd.int/sites/default/files/js/js_J_7eOZCJhiAHj9BV-dkmpAi2kFpcDPm-szQUzRvoXoA.js34 KB21 KB (62%)✓3rd
https://www.cbd.int/sites/default/files/js/js_J2luA5l_SDJmmdm7wO88tRni8LgRRzEK-rIE7Lz7fhY.js25 KB—✓3rd
https://www.cbd.int/sites/default/files/js/js_VUEPQDZKxh1-vOGY_SMuT65EjffMcWp2s1sKdhKdI_U.js8 KB—✓3rd
https://use.fontawesome.com/releases/v6.1.0/js/all.js611 KB—✓3rd
https://use.fontawesome.com/releases/v6.1.0/js/v4-shims.js8 KB—✓3rd
https://www.cbd.int/libraries/lazysizes/lazysizes.min.js4 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
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 (60 KB)
PASS
3 fonts (60 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

60 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 FCP 2.0 s LCP 10.1 shttps://www.cbd.int/themes/custom/bootstrap_sass/fonts/benchnine-v9-latin-regular.woff2benchnine-v9-latin-regu... https://www.cbd.int/themes/custom/bootstrap_sass/fonts/benchnine-v9-latin-regular.woff2 — 20.2 KiB — 50 ms — font-display: swaphttps://www.cbd.int/themes/custom/bootstrap_sass/fonts/benchnine-v9-latin-300.woff2benchnine-v9-latin-300.... https://www.cbd.int/themes/custom/bootstrap_sass/fonts/benchnine-v9-latin-300.woff2 — 19.4 KiB — 95 ms — font-display: swaphttps://www.cbd.int/themes/custom/bootstrap_sass/fonts/benchnine-v9-latin-700.woff2benchnine-v9-latin-700.... https://www.cbd.int/themes/custom/bootstrap_sass/fonts/benchnine-v9-latin-700.woff2 — 20.2 KiB — 96 ms — font-display: swap
benchnine-v9-latin-regu... woff2 swap
Size 20 KB
Load time 50 ms
Start 105 ms
Risk FOUT — text flashes from fallback to web font
benchnine-v9-latin-300.... woff2 swap
Size 19 KB
Load time 95 ms
Start 197 ms
Risk FOUT — text flashes from fallback to web font
benchnine-v9-latin-700.... woff2 swap
Size 20 KB
Load time 96 ms
Start 197 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
—

1 resource hints configured

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
Network Waterfall
37 requests over 579ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.0 s LCP 10.1 shttps://cbd.int// https://cbd.int/ — 301 — 242 B — 18 ms — h2https://www.cbd.int/www.cbd.int/ https://www.cbd.int/ — 200 — 29.6 KiB — 74 ms — h2https://www.googletagmanager.com/gtag/js?id=G-7S1TPRE7F5www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-7S1TPRE7F5 — 200 — 176.3 KiB — 180 ms — h2https://www.cbd.int/themes/custom/bootstrap_sass/fonts/benchnine-v9-latin-regular.woff2www.cbd.int/themes/custom/bootstrap... https://www.cbd.int/themes/custom/bootstrap_sass/fonts/benchnine-v9-latin-regular.woff2 — 200 — 20.2 KiB — 50 ms — h2https://www.cbd.int/sites/default/files/css/css_q7mfAtJevoOj5Li-znXjZouGo2MIfDoCdyquC56n4hU.csswww.cbd.int/sites/default/files/css... https://www.cbd.int/sites/default/files/css/css_q7mfAtJevoOj5Li-znXjZouGo2MIfDoCdyquC56n4hU.css — 200 — 4.3 KiB — 18 ms — h2https://www.cbd.int/sites/default/files/css/css_xlIf27_Pa-6gnwS9VTXoahE5Glp4H0_fc2MMl653v4o.csswww.cbd.int/sites/default/files/css... https://www.cbd.int/sites/default/files/css/css_xlIf27_Pa-6gnwS9VTXoahE5Glp4H0_fc2MMl653v4o.css — 200 — 32.9 KiB — 26 ms — h2https://www.cbd.int/sites/default/files/css/css_XJZWO4S2z9RTM5vMczO3eZmboeyVAdkNcX9tblBxk0o.csswww.cbd.int/sites/default/files/css... https://www.cbd.int/sites/default/files/css/css_XJZWO4S2z9RTM5vMczO3eZmboeyVAdkNcX9tblBxk0o.css — 200 — 4.7 KiB — 15 ms — h2https://www.cbd.int/themes/custom/bootstrap_sass/images/CBD_logo_green.pngwww.cbd.int/themes/custom/bootstrap... https://www.cbd.int/themes/custom/bootstrap_sass/images/CBD_logo_green.png — 200 — 4.1 KiB — 51 ms — h2https://www.cbd.int/themes/custom/bootstrap_sass/images/icon_arrow_r_pos.svgwww.cbd.int/themes/custom/bootstrap... https://www.cbd.int/themes/custom/bootstrap_sass/images/icon_arrow_r_pos.svg — 200 — 630 B — 123 ms — h2https://www.cbd.int/sites/default/files/js/js_J_7eOZCJhiAHj9BV-dkmpAi2kFpcDPm-szQUzRvoXoA.jswww.cbd.int/sites/default/files/js/... https://www.cbd.int/sites/default/files/js/js_J_7eOZCJhiAHj9BV-dkmpAi2kFpcDPm-szQUzRvoXoA.js — 200 — 33.7 KiB — 20 ms — h2https://www.cbd.int/sites/default/files/js/js_J2luA5l_SDJmmdm7wO88tRni8LgRRzEK-rIE7Lz7fhY.jswww.cbd.int/sites/default/files/js/... https://www.cbd.int/sites/default/files/js/js_J2luA5l_SDJmmdm7wO88tRni8LgRRzEK-rIE7Lz7fhY.js — 200 — 24.8 KiB — 20 ms — h2https://www.cbd.int/sites/default/files/js/js_fQZXcYZFBKPW0gks83W9qL4omu9dK1iY9rZLgwCe_0s.jswww.cbd.int/sites/default/files/js/... https://www.cbd.int/sites/default/files/js/js_fQZXcYZFBKPW0gks83W9qL4omu9dK1iY9rZLgwCe_0s.js — 200 — 28.0 KiB — 22 ms — h2https://www.cbd.int/sites/default/files/js/js_VUEPQDZKxh1-vOGY_SMuT65EjffMcWp2s1sKdhKdI_U.jswww.cbd.int/sites/default/files/js/... https://www.cbd.int/sites/default/files/js/js_VUEPQDZKxh1-vOGY_SMuT65EjffMcWp2s1sKdhKdI_U.js — 200 — 8.5 KiB — 21 ms — h2https://use.fontawesome.com/releases/v6.1.0/js/all.jsuse.fontawesome.com/releases/v6.1.0... https://use.fontawesome.com/releases/v6.1.0/js/all.js — 200 — 610.6 KiB — 165 ms — h2https://use.fontawesome.com/releases/v6.1.0/js/v4-shims.jsuse.fontawesome.com/releases/v6.1.0... https://use.fontawesome.com/releases/v6.1.0/js/v4-shims.js — 200 — 8.4 KiB — 84 ms — h2https://www.cbd.int/sites/default/files/2023-12/biodiversity_plan_neg.svgwww.cbd.int/sites/default/files/202... https://www.cbd.int/sites/default/files/2023-12/biodiversity_plan_neg.svg — 200 — 7.4 KiB — 43 ms — h2https://www.cbd.int/sites/default/files/2018-12/icon_shortcut_topics_neg.svgwww.cbd.int/sites/default/files/201... https://www.cbd.int/sites/default/files/2018-12/icon_shortcut_topics_neg.svg — 200 — 1.1 KiB — 41 ms — h2https://www.cbd.int/sites/default/files/2018-12/icon_shortcut_process_neg.svgwww.cbd.int/sites/default/files/201... https://www.cbd.int/sites/default/files/2018-12/icon_shortcut_process_neg.svg — 200 — 1.0 KiB — 59 ms — h2https://www.cbd.int/sites/default/files/2018-12/icon_shortcut_partners_neg.svgwww.cbd.int/sites/default/files/201... https://www.cbd.int/sites/default/files/2018-12/icon_shortcut_partners_neg.svg — 200 — 1.2 KiB — 49 ms — h2https://www.cbd.int/sites/default/files/2018-12/icon_shortcut_news_neg.svgwww.cbd.int/sites/default/files/201... https://www.cbd.int/sites/default/files/2018-12/icon_shortcut_news_neg.svg — 200 — 1.1 KiB — 45 ms — h2https://www.cbd.int/modules/custom/cbd_updates/images/Updates-background.pngwww.cbd.int/modules/custom/cbd_upda... https://www.cbd.int/modules/custom/cbd_updates/images/Updates-background.png — 200 — 100.9 KiB — 102 ms — h2https://www.cbd.int/themes/custom/bootstrap_sass/images/icon_arrow_l_pos.svgwww.cbd.int/themes/custom/bootstrap... https://www.cbd.int/themes/custom/bootstrap_sass/images/icon_arrow_l_pos.svg — 200 — 635 B — 53 ms — h2https://www.cbd.int/modules/custom/cbd_updates/images/icon_arrow_r_neg.pngwww.cbd.int/modules/custom/cbd_upda... https://www.cbd.int/modules/custom/cbd_updates/images/icon_arrow_r_neg.png — 200 — 594 B — 100 ms — h2https://www.cbd.int/themes/custom/bootstrap_sass/images/yellow_rectangle_mobile.pngwww.cbd.int/themes/custom/bootstrap... https://www.cbd.int/themes/custom/bootstrap_sass/images/yellow_rectangle_mobile.png — 200 — 36.2 KiB — 102 ms — h2https://www.cbd.int/themes/custom/bootstrap_sass/images/green_rectangle_mobile.pngwww.cbd.int/themes/custom/bootstrap... https://www.cbd.int/themes/custom/bootstrap_sass/images/green_rectangle_mobile.png — 200 — 45.6 KiB — 104 ms — h2https://www.cbd.int/themes/contrib/bootstrap_barrio/images/required.svgwww.cbd.int/themes/contrib/bootstra... https://www.cbd.int/themes/contrib/bootstrap_barrio/images/required.svg — 200 — 956 B — 126 ms — h2https://www.cbd.int/themes/custom/bootstrap_sass/images/blue_rectangle_mobile.pngwww.cbd.int/themes/custom/bootstrap... https://www.cbd.int/themes/custom/bootstrap_sass/images/blue_rectangle_mobile.png — 200 — 12.2 KiB — 170 ms — h2https://www.cbd.int/sites/default/files/styles/xs_16_9/public/2026-04/website_banner_idb_1_0.png?itok=jpE2jtEpwww.cbd.int/sites/default/files/sty... https://www.cbd.int/sites/default/files/styles/xs_16_9/public/2026-04/website_banner_idb_1_0.png?itok=jpE2jtEp — 200 — 231.3 KiB — 134 ms — h2https://www.cbd.int/sites/default/files/styles/updates_mobile_images_/public/2026-04/photo-1571785983781-3317703d64a6_3.jpg?itok=dyjkS4vWwww.cbd.int/sites/default/files/sty... https://www.cbd.int/sites/default/files/styles/updates_mobile_images_/public/2026-04/photo-1571785983781-3317703d64a6_3.jpg?itok=dyjkS4vW — 200 — 45.3 KiB — 113 ms — h2https://www.cbd.int/sites/default/files/styles/max_1300x1300/public/2024-07/Astrid-headshot-4.jpg?itok=ZiZ68sLLwww.cbd.int/sites/default/files/sty... https://www.cbd.int/sites/default/files/styles/max_1300x1300/public/2024-07/Astrid-headshot-4.jpg?itok=ZiZ68sLL — 200 — 146.6 KiB — 57 ms — h2
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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 1019ms · 875KB · €11/mo
Unattributable
Other
Costly
Execution 306ms
Transfer 0 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 234ms
Transfer 176 KB
Unused 39%
Monthly Cost €3/mo
www.cbd.int
Other
Optional
Execution 194ms
Transfer 30 KB
Monthly Cost €2/mo
use.fontawesome.com
Other
Optional
Execution 181ms
Transfer 611 KB
Monthly Cost €2/mo
www.cbd.int
Other
Optional
Execution 53ms
Transfer 25 KB
Monthly Cost €1/mo
www.cbd.int
Other
Optional
Execution 50ms
Transfer 34 KB
Unused 62%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 306ms and costs ~€3/month
  • Google Tag Manager adds 234ms and costs ~€3/month

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

Why this matters

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

Learn more ▾

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

Source: web.dev

Unattributable takes 306ms 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 234ms 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

62% of www.cbd.int'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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