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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
91
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.
77
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.

949 ms

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

1.73 s

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

24 ms

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

0.005

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

1.16 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.

2.95 s

Page Load Progression

418 ms
837 ms
1.3 s
1.7 s
2.1 s
2.5 s
2.9 s
3.3 s
Checks
15
6 PASS 4 REVIEW 3 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 86 requests
FIX
2.3 MB transferred, 86 requests
Info::
Page weighs 6.1 MB (2.3 MB transferred)
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Warning::
JavaScript is 823 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 823 KB
Info::
86 HTTP requests
Info::
Estimated 0.48 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
86 requests
0.48 g CO2 per page load
Images 1.1 MiB 48%
JavaScript 823.2 KiB 35%
HTML 162.6 KiB 7%
Fonts 158.9 KiB 7%
CSS 75.5 KiB 3%
Other 9.6 KiB 0%
Other 8.5 KiB 0%
Other 989 B 0%
Other 0 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 (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
86 resources · 2.3 MB · 288 KB savings available
FIX
86 resources · 2.3 MB · 288 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~288 KB of savings available
Warning::
85 third-party resources (100% of weight)
Info::
1 resources over 200KB
86 resources · 2.3 MiB · 85 third-party 1.3 MiB over 1MB target
Image 48% · 1.1 MiB
JavaScript 35% · 827.0 KiB
Document 7% · 162.8 KiB
Font 7% · 158.9 KiB
CSS 3% · 75.5 KiB
Other 0% · 7.5 KiB

~288.2 KiB of savings available

Remove unused JavaScript: 288.2 KiB
B
Image Optimization
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Info::
All images are well-optimized
35 images 1.1 MB
0 oversized -0 KB
12 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
925ms total JS execution
REVIEW
925ms total JS execution
Warning::
https://www.oecd.org/en/publications.html: 312ms CPU time
Info::
Unattributable: 135ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-P5J...: 117ms CPU time
Info::
https://surveys-static-prd.survicate-cdn.com/widge...: 100ms CPU time
Info::
https://static-p53839-e349852.adobeaemcloud.com/bb...: 96ms CPU time
Warning::
Third-party scripts: 925ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Style & Layout 25% Other 17% Script Parsing & Compilation 6% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.oecd.org/en/publications.html312ms21ms2ms3rd
Unattributable135ms2ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P5JSM4P117ms100ms13ms3rd
https://surveys-static-prd.survicate-cdn.com/widget_core-28.23.14.js100ms79ms14ms3rd
https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/theme.js96ms28ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-F7KSNTXTRX&cx=c&gtm=4e64h1h157ms47ms10ms3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js57ms49ms4ms3rd
https://www.oecd.org/cdn-cgi/challenge-platform/scripts/jsd/main.js51ms47ms1ms3rd
C
JS Bundles
Action
17 scripts, 288 KB unused
REVIEW
17 scripts, 288 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P5J...: 66 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://surveys-static-prd.survicate-cdn.com/widge...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-JK2H...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-F7KS...: 63 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.crazyegg.com/pages/versioned/common...: 29 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 288 KB
288 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-P5JSM4P181 KB66 KB (36%)✓3rd
https://surveys-static-prd.survicate-cdn.com/widget_core-28.23.14.js161 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-JK2HCFJNL1&cx=c&gtm=4e64h1h1152 KB65 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-F7KSNTXTRX&cx=c&gtm=4e64h1h1152 KB63 KB (41%)✓3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js55 KB29 KB (53%)✓3rd
https://www.oecd.org/etc.clientlibs/oecd/clientlibs/clientlib-base.lc-cfd8fccbd7bd3edcddf562f1ca8a30e7-lc.min.js22 KB—✓3rd
https://www.oecd.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?12 KB—✓3rd
https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/dist.a89178bd.js7 KB—✓3rd
https://www.oecd.org/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js1 KB—✓3rd
https://www.google-analytics.com/analytics.js21 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

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
7 fonts (159 KB)
PASS
7 fonts (159 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

159 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 949 ms LCP 1.7 shttps://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/noto-sans-400-latin.bcd3f5cc.woff2noto-sans-400-latin.bcd... https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/noto-sans-400-latin.bcd3f5cc.woff2 — 14.3 KiB — 8 ms — font-display: swaphttps://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/noto-sans-700-latin.ac6371c7.woff2noto-sans-700-latin.ac6... https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/noto-sans-700-latin.ac6371c7.woff2 — 13.8 KiB — 9 ms — font-display: swaphttps://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/noto-sans-500-latin.e6eeb184.woff2noto-sans-500-latin.e6e... https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/noto-sans-500-latin.e6eeb184.woff2 — 14.2 KiB — 15 ms — font-display: swaphttps://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/noto-sans-display-latin.f7492f65.woff2noto-sans-display-latin... https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/noto-sans-display-latin.f7492f65.woff2 — 35.1 KiB — 15 ms — font-display: swaphttps://surveys-static-prd.survicate-cdn.com/fonts/open-sans-latin.woff2open-sans-latin.woff2 https://surveys-static-prd.survicate-cdn.com/fonts/open-sans-latin.woff2 — 39.3 KiB — 28 ms — font-display: swaphttps://surveys-static-prd.survicate-cdn.com/fonts/open-sans-latin.woff2open-sans-latin.woff2 https://surveys-static-prd.survicate-cdn.com/fonts/open-sans-latin.woff2 — 0 B — 28 ms — font-display: swaphttps://surveys-static-prd.survicate-cdn.com/fonts/open-sans-italic-latin.woff2open-sans-italic-latin.... https://surveys-static-prd.survicate-cdn.com/fonts/open-sans-italic-latin.woff2 — 42.1 KiB — 26 ms — font-display: swap
noto-sans-400-latin.bcd... woff2 swap
Size 14 KB
Load time 8 ms
Start 437 ms
Risk FOUT — text flashes from fallback to web font
noto-sans-700-latin.ac6... woff2 swap
Size 14 KB
Load time 9 ms
Start 438 ms
Risk FOUT — text flashes from fallback to web font
noto-sans-500-latin.e6e... woff2 swap
Size 14 KB
Load time 15 ms
Start 438 ms
Risk FOUT — text flashes from fallback to web font
noto-sans-display-latin... woff2 swap
Size 35 KB
Load time 15 ms
Start 438 ms
Risk FOUT — text flashes from fallback to web font
open-sans-latin.woff2 woff2 swap
Size 39 KB
Load time 28 ms
Start 3.3 s
Risk FOUT — text flashes from fallback to web font
open-sans-latin.woff2 woff2 swap
Size 0 KB
Load time 28 ms
Start 3.3 s
Risk FOUT — text flashes from fallback to web font
open-sans-italic-latin.... woff2 swap
Size 42 KB
Load time 26 ms
Start 3.3 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=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: max-age=300
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=300

DirectiveValueMeaning
max-age300Cache for 5 minutes
Effective TTL: 300 seconds
Network Waterfall
86 requests over 3610ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 949 ms LCP 1.7 shttps://oecd-ilibrary.org// https://oecd-ilibrary.org/ — 301 — 230 B — 6 ms — h2https://www.oecd.org/en/publications.htmlwww.oecd.org/en/publications.html https://www.oecd.org/en/publications.html — 200 — 162.6 KiB — 319 ms — h2https://www.oecd.org/.rum/@adobe/helix-rum-js@%5E2/dist/micro.jswww.oecd.org/.rum/@adobe/helix-rum-... https://www.oecd.org/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js — 200 — 958 B — 44 ms — h2https://www.oecd.org/etc.clientlibs/oecd/clientlibs/clientlib-base.lc-d8e9a44764866640e709abbb8b7e48f7-lc.min.csswww.oecd.org/etc.clientlibs/oecd/cl... https://www.oecd.org/etc.clientlibs/oecd/clientlibs/clientlib-base.lc-d8e9a44764866640e709abbb8b7e48f7-lc.min.css — 200 — 2.3 KiB — 37 ms — h2https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/theme.cssstatic-p53839-e349852.adobeaemcloud... https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/theme.css — 200 — 71.3 KiB — 14 ms — h2https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--adb459b8-8956-447c-a2c4-a8cf8a1b77a5/publication-header.png?width=1900&preferwebp=true&quality=80www.oecd.org/adobe/dynamicmedia/del... https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--adb459b8-8956-447c-a2c4-a8cf8a1b77a5/publication-header.png?width=1900&preferwebp=true&quality=80 — 200 — 494.8 KiB — 241 ms — h2https://dev.visualwebsiteoptimizer.com/j.php?a=1033969&u=https%3A%2F%2Fwww.oecd.org%2Fen%2Fpublications.html&vn=2.1&x=truedev.visualwebsiteoptimizer.com/j.ph... https://dev.visualwebsiteoptimizer.com/j.php?a=1033969&u=https%3A%2F%2Fwww.oecd.org%2Fen%2Fpublications.html&vn=2.1&x=true — 200 — 3.8 KiB — 103 ms — h2https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/theme.jsstatic-p53839-e349852.adobeaemcloud... https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/theme.js — 200 — 33.0 KiB — 4 ms — h2https://www.oecd.org/etc.clientlibs/core/wcm/components/commons/site/clientlibs/container.lc-0a6aff292f5cc42142779cde92054524-lc.min.jswww.oecd.org/etc.clientlibs/core/wc... https://www.oecd.org/etc.clientlibs/core/wcm/components/commons/site/clientlibs/container.lc-0a6aff292f5cc42142779cde92054524-lc.min.js — 200 — 896 B — 36 ms — h3https://www.oecd.org/etc.clientlibs/oecd/clientlibs/clientlib-base.lc-cfd8fccbd7bd3edcddf562f1ca8a30e7-lc.min.jswww.oecd.org/etc.clientlibs/oecd/cl... https://www.oecd.org/etc.clientlibs/oecd/clientlibs/clientlib-base.lc-cfd8fccbd7bd3edcddf562f1ca8a30e7-lc.min.js — 200 — 22.5 KiB — 53 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-P5JSM4Pwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-P5JSM4P — 200 — 181.0 KiB — 165 ms — h2data:image/svg+xml, %3Csvg%20width=%2716%27%20height=%2716%27%20fill=%27none%27%20xmlns=%27http%3A%…data:image/svg+xml, %3Csvg%20width=... data:image/svg+xml, %3Csvg%20width=%2716%27%20height=%2716%27%20fill=%27none%27%20xmlns=%27http%3A%… — 200 — 0 B — 0 ms — datadata:image/svg+xml, %3Csvg%20width=%2716%27%20height=%2716%27%20viewBox=%270%200%2016%2016%27%20fil…data:image/svg+xml, %3Csvg%20width=... data:image/svg+xml, %3Csvg%20width=%2716%27%20height=%2716%27%20viewBox=%270%200%2016%2016%27%20fil… — 200 — 0 B — 0 ms — datadata:image/svg+xml, %3Csvg%20width=%2716%27%20height=%2716%27%20fill=%27none%27%20xmlns=%27http%3A%…data:image/svg+xml, %3Csvg%20width=... data:image/svg+xml, %3Csvg%20width=%2716%27%20height=%2716%27%20fill=%27none%27%20xmlns=%27http%3A%… — 200 — 0 B — 0 ms — datahttps://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/country-flags.cb738a48.pngstatic-p53839-e349852.adobeaemcloud... https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/country-flags.cb738a48.png — 200 — 27.0 KiB — 4 ms — h2https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--ca6a40ff-75e7-4840-a67a-16c08e15b1d3/artificial-intelligence-circuit-board-brain-2024.jpg?width=370&preferwebp=true&quality=80www.oecd.org/adobe/dynamicmedia/del... https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--ca6a40ff-75e7-4840-a67a-16c08e15b1d3/artificial-intelligence-circuit-board-brain-2024.jpg?width=370&preferwebp=true&quality=80 — 200 — 8.7 KiB — 110 ms — h3https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--3b8a81d5-31bd-410c-9200-5a2f33cb3ba4/env-shutterstock-306313655.jpg?width=370&preferwebp=true&quality=80www.oecd.org/adobe/dynamicmedia/del... 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https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js — 200 — 55.3 KiB — 60 ms — h3https://www.oecd.org/etc.clientlibs/oecd/clientlibs/clientlib-base/resources/icon-192x192.pngwww.oecd.org/etc.clientlibs/oecd/cl... https://www.oecd.org/etc.clientlibs/oecd/clientlibs/clientlib-base/resources/icon-192x192.png — 200 — 7.5 KiB — 36 ms — h3https://script.crazyegg.com/pages/data-scripts/0126/6330/sampling/www.oecd.org.json?t=1script.crazyegg.com/pages/data-scri... https://script.crazyegg.com/pages/data-scripts/0126/6330/sampling/www.oecd.org.json?t=1 — 200 — 376 B — 25 ms — h3https://tracking.crazyegg.com/clock?u=1266330&st=455070&t=1776806333927&tk=f07f983051e3082671ec3ed244aa0bbbtracking.crazyegg.com/clock?u=12663... https://tracking.crazyegg.com/clock?u=1266330&st=455070&t=1776806333927&tk=f07f983051e3082671ec3ed244aa0bbb — 204 — 0 B — 120 ms — h2https://pagestates-tracking.crazyegg.com/healthcheckpagestates-tracking.crazyegg.com/he... 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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 925ms · 745KB · $12/mo
www.oecd.org
Other
Costly
Execution 312ms
Transfer 163 KB
Monthly Cost $4/mo
Unattributable
Other
Optional
Execution 135ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 117ms
Transfer 181 KB
Unused 36%
Monthly Cost $2/mo
surveys-static-prd.survicate-cdn.com
Other
Optional
Execution 100ms
Transfer 161 KB
Unused 41%
Monthly Cost $1/mo
static-p53839-e349852.adobeaemcloud.com
Other
Optional
Execution 96ms
Transfer 33 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 57ms
Transfer 152 KB
Unused 41%
Monthly Cost $1/mo
script.crazyegg.com
Other
Optional
Execution 57ms
Transfer 55 KB
Unused 53%
Monthly Cost $1/mo
www.oecd.org
Other
Optional
Execution 51ms
Transfer 0 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.oecd.org adds 312ms and costs ~$4/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

www.oecd.org takes 312ms 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

53% of script.crazyegg.com'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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