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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
4
REVIEW
3
PASS
6
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.
84
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.

602 ms

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

2.55 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.

0.014

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

1.36 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.

2.57 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
6 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 48 requests
FIX
2.4 MB transferred, 48 requests
Info::
Page weighs 4.3 MB (2.4 MB transferred)
Warning::
Images are 1.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.4 MB
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::
48 HTTP requests
Info::
Estimated 0.50 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
48 requests
0.50 g CO2 per page load
Images 1.4 MiB 58%
JavaScript 893.9 KiB 37%
Fonts 59.9 KiB 2%
CSS 42.0 KiB 2%
HTML 29.6 KiB 1%
Other 4.3 KiB 0%
Other 546 B 0%
Other 546 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

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

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 (2.4 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
48 resources · 2.4 MB · 111 KB savings available
FIX
48 resources · 2.4 MB · 111 KB savings available
Warning::
Page weight 1.4 MB over 1MB target
Got: 2.4 MB Expected: ≤ 1 MB
Info::
~111 KB of savings available
Warning::
47 third-party resources (100% of weight)
Info::
2 resources over 200KB
48 resources · 2.4 MiB · 47 third-party 1.4 MiB over 1MB target
Image 58% · 1.4 MiB
JavaScript 37% · 893.9 KiB
Font 2% · 59.9 KiB
CSS 2% · 42.0 KiB
Document 1% · 29.6 KiB
Other 0% · 1.3 KiB

~111.0 KiB of savings available

Remove unused JavaScript: 111.0 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
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
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.
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.
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.
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/upd... 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.
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.
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.
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/themes/custom/bootstrap_sass/i... 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.
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.
29 images 1.4 MB
0 oversized -0 KB
29 legacy format
13 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

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.js610 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+
JS Execution Cost
225ms total JS execution
PASS
225ms total JS execution
Info::
Unattributable: 83ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-7S1T...: 77ms CPU time
Info::
https://www.cbd.int/: 65ms CPU time
Warning::
Third-party scripts: 225ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Other 27% Script Parsing & Compilation 15% Style & Layout 13% Rendering 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable83ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7S1TPRE7F577ms63ms11ms3rd
https://www.cbd.int/65ms3ms0ms3rd
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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 602 ms LCP 2.6 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 — 95 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 — 46 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 — 149 ms — font-display: swap
benchnine-v9-latin-regu... woff2 swap
Size 20 KB
Load time 95 ms
Start 630 ms
Risk FOUT — text flashes from fallback to web font
benchnine-v9-latin-300.... woff2 swap
Size 19 KB
Load time 46 ms
Start 769 ms
Risk FOUT — text flashes from fallback to web font
benchnine-v9-latin-700.... woff2 swap
Size 20 KB
Load time 149 ms
Start 769 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
48 requests over 1622ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 602 ms LCP 2.6 shttps://cbd.int// https://cbd.int/ — 301 — 241 B — 13 ms — h2https://www.cbd.int/www.cbd.int/ https://www.cbd.int/ — 200 — 29.6 KiB — 609 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 — 167 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 — 95 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 — 9 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 — 12 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 — 12 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 — 150 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 — 629 B — 364 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 — 13 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 — 13 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 — 15 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 — 15 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 — 610.4 KiB — 150 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 — 8.3 KiB — 82 ms — h2https://www.cbd.int/themes/custom/bootstrap_sass/images/icon_search_pos.pngwww.cbd.int/themes/custom/bootstrap... https://www.cbd.int/themes/custom/bootstrap_sass/images/icon_search_pos.png — 200 — 833 B — 109 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 — 85 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 — 47 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 — 124 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 — 106 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 — 90 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 — 594 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 — 64 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 — 114 ms — h2https://www.cbd.int/themes/custom/bootstrap_sass/images/yellow_rectangle_desktop.pngwww.cbd.int/themes/custom/bootstrap... https://www.cbd.int/themes/custom/bootstrap_sass/images/yellow_rectangle_desktop.png — 200 — 33.9 KiB — 113 ms — h2https://www.cbd.int/themes/custom/bootstrap_sass/images/green_rectangle_dekstop.pngwww.cbd.int/themes/custom/bootstrap... https://www.cbd.int/themes/custom/bootstrap_sass/images/green_rectangle_dekstop.png — 200 — 24.4 KiB — 103 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 — 955 B — 129 ms — h2https://www.cbd.int/themes/custom/bootstrap_sass/images/blue_rectangle_dekstop.pngwww.cbd.int/themes/custom/bootstrap... https://www.cbd.int/themes/custom/bootstrap_sass/images/blue_rectangle_dekstop.png — 200 — 7.8 KiB — 41 ms — h2https://www.cbd.int/sites/default/files/styles/xl_16_9/public/2026-04/website_banner_idb_1_0.png?itok=ClQeyv3Swww.cbd.int/sites/default/files/sty... https://www.cbd.int/sites/default/files/styles/xl_16_9/public/2026-04/website_banner_idb_1_0.png?itok=ClQeyv3S — 200 — 877.6 KiB — 159 ms — h2https://www.cbd.int/sites/default/files/styles/updates_desktop_images/public/2026-04/photo-1571785983781-3317703d64a6_3.jpg?itok=hn7b2xjlwww.cbd.int/sites/default/files/sty... 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0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 602 ms LCP 2.6 shttps://cbd.int// https://cbd.int/ — 301 — 241 B — 13 ms — h2https://www.cbd.int/www.cbd.int/ https://www.cbd.int/ — 200 — 29.6 KiB — 609 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 — 167 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 — 95 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 — 9 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 225ms · 206KB · €2/mo
Unattributable
Other
Optional
Execution 83ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 77ms
Transfer 176 KB
Unused 39%
Monthly Cost €1/mo
www.cbd.int
Other
Optional
Execution 65ms
Transfer 30 KB
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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