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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
33
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.

8.95 s

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

14.84 s

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

1.13 s

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

0.001

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

8.95 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.

14.86 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 2 REVIEW 4 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 (2.1 MiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5116ms total JS execution
FIX
5116ms total JS execution
Warning::
https://www.oecd.org/: 1273ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P5J...: 733ms CPU time
Warning::
https://surveys-static-prd.survicate-cdn.com/widge...: 509ms CPU time
Warning::
https://static-p53839-e349852.adobeaemcloud.com/bb...: 462ms CPU time
Warning::
Unattributable: 418ms CPU time
Warning::
Third-party scripts: 5116ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Style & Layout 19% Other 13% Script Parsing & Compilation 8% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.oecd.org/1273ms81ms11ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P5JSM4P733ms617ms82ms3rd
https://surveys-static-prd.survicate-cdn.com/widget_core-28.23.14.js509ms404ms86ms3rd
https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/theme.js462ms180ms15ms3rd
Unattributable418ms8ms0ms3rd
https://www.oecd.org/cdn-cgi/challenge-platform/scripts/jsd/main.js395ms356ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-F7KSNTXTRX&cx=c&gtm=4e64h1392ms325ms65ms3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js351ms309ms22ms3rd
https://www.googletagmanager.com/gtag/js?id=G-JK2HCFJNL1&cx=c&gtm=4e64h1304ms234ms68ms3rd
https://public.flourish.studio/resources/embed.js103ms82ms6ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
21 scripts, 300 KB unused
FIX
21 scripts, 300 KB unused
Warning::
https://surveys-static-prd.survicate-cdn.com/widge...: 77 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
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://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 (42%)
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: 300 KB
300 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://surveys-static-prd.survicate-cdn.com/widget_core-28.23.14.js161 KB77 KB (48%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P5JSM4P181 KB66 KB (36%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-JK2HCFJNL1&cx=c&gtm=4e64h1152 KB65 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-F7KSNTXTRX&cx=c&gtm=4e64h1152 KB63 KB (42%)✓3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js55 KB29 KB (53%)✓3rd
https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/dist.a89178bd.js7 KB—✓3rd
https://www.google-analytics.com/analytics.js21 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/flourish-google-analytics.e319e1b1.js1 KB—✓3rd
https://public.flourish.studio/resources/story_player.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

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

D
Page Weight Inventory
Action
75 resources · 2.1 MB · 300 KB savings available
FIX
75 resources · 2.1 MB · 300 KB savings available
Warning::
Page weight 1.1 MB over 1MB target
Got: 2.1 MB Expected: ≤ 1 MB
Info::
~300 KB of savings available
Warning::
74 third-party resources (100% of weight)
Info::
1 resources over 200KB
75 resources · 2.1 MiB · 74 third-party 1.1 MiB over 1MB target
JavaScript 42% · 879.0 KiB
Font 23% · 491.6 KiB
Document 21% · 441.7 KiB
Image 9% · 190.3 KiB
CSS 5% · 95.3 KiB
Other 0% · 6.2 KiB

~300.1 KiB of savings available

Remove unused JavaScript: 300.1 KiB
C
Page Weight Budget
Action
2.1 MB transferred, 75 requests
REVIEW
2.1 MB transferred, 75 requests
Info::
Page weighs 6.7 MB (2.1 MB transferred)
Warning::
JavaScript is 875 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 875 KB
Info::
Fonts are 492 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 492 KB
Info::
75 HTTP requests
Info::
Estimated 0.43 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
75 requests
0.43 g CO2 per page load
JavaScript 875.2 KiB 42%
Fonts 491.6 KiB 23%
HTML 441.4 KiB 21%
Images 182.8 KiB 9%
CSS 95.3 KiB 5%
Other 9.2 KiB 0%
Other 8.6 KiB 0%
Other 61 B 0%
Other 0 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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+
Image Optimization
12 images, 0 KB saveable
PASS
12 images, 0 KB saveable
Info::
All images are well-optimized
12 images 183 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
10 fonts (492 KB)
PASS
10 fonts (492 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

492 KB total

Render-blocking

0

of 10

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 FCP 9.0 s LCP 14.8 shttps://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 — 20 ms — font-display: swaphttps://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 — 14.0 KiB — 17 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 — 35.4 KiB — 22 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 — 18 ms — font-display: swaphttps://public.flourish.studio/resources/fonts/fontawesome-webfont.woff2?v=4.5.0fontawesome-webfont.woff2 https://public.flourish.studio/resources/fonts/fontawesome-webfont.woff2?v=4.5.0 — 65.4 KiB — 21 ms — font-display: swaphttps://public.flourish.studio/resources/fonts/source-sans-pro/WOFF/OTF/SourceSansPro-Bold.otf.woffSourceSansPro-Bold.otf.... https://public.flourish.studio/resources/fonts/source-sans-pro/WOFF/OTF/SourceSansPro-Bold.otf.woff — 133.0 KiB — 32 ms — font-display: swaphttps://public.flourish.studio/resources/fonts/source-sans-pro/WOFF/OTF/SourceSansPro-Regular.otf.woffSourceSansPro-Regular.o... https://public.flourish.studio/resources/fonts/source-sans-pro/WOFF/OTF/SourceSansPro-Regular.otf.woff — 130.4 KiB — 24 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQ.woff2ieVl2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQ.woff2 — 50.2 KiB — 13 ms — font-display: swaphttps://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7duw.woff2o-0bIpQlx3QUlC5A4PNB6Ry... https://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7duw.woff2 — 35.0 KiB — 14 ms — font-display: swaphttps://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7duw.woff2o-0bIpQlx3QUlC5A4PNB6Ry... https://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7duw.woff2 — 0 B — 14 ms — font-display: swap
noto-sans-500-latin.e6e... woff2 swap
Size 14 KB
Load time 20 ms
Start 552 ms
Risk FOUT — text flashes from fallback to web font
noto-sans-400-latin.bcd... woff2 swap
Size 14 KB
Load time 17 ms
Start 553 ms
Risk FOUT — text flashes from fallback to web font
noto-sans-display-latin... woff2 swap
Size 35 KB
Load time 22 ms
Start 553 ms
Risk FOUT — text flashes from fallback to web font
noto-sans-700-latin.ac6... woff2 swap
Size 14 KB
Load time 18 ms
Start 553 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 woff2 swap
Size 65 KB
Load time 21 ms
Start 836 ms
Risk FOUT — text flashes from fallback to web font
SourceSansPro-Bold.otf.... woff swap
Size 133 KB
Load time 32 ms
Start 837 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
SourceSansPro-Regular.o... woff swap
Size 130 KB
Load time 24 ms
Start 837 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 50 KB
Load time 13 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 35 KB
Load time 14 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 0 KB
Load time 14 ms
Start 2.8 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)

Fixing the unchecked items could save ~211 KB and ~422 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
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=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
75 requests over 2805ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 9.0 s LCP 14.8 shttps://oecd.org// https://oecd.org/ — 301 — 216 B — 20 ms — h2https://www.oecd.org/www.oecd.org/ https://www.oecd.org/ — 200 — 166.5 KiB — 323 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 — 968 B — 36 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 — 22 ms — h2https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/theme.cssstatic-p53839-e349852.adobeaemcloud... https://static-p53839-e349852.adobeaemcloud.com/bb98e20436f2d4e57068da7d4d3d125802ca2946fd87687e4b48b1acb2883872/theme.css — 200 — 70.6 KiB — 74 ms — h2https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--e9b90694-1bc1-4d4e-a86b-94d53ca42350/sustainable-development-goals.jpg?quality=80&width=930&preferwebp=truewww.oecd.org/adobe/dynamicmedia/del... https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--e9b90694-1bc1-4d4e-a86b-94d53ca42350/sustainable-development-goals.jpg?quality=80&width=930&preferwebp=true — 200 — 132.2 KiB — 237 ms — h3https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--9b78a0e4-78f6-4dd8-90d3-8f346c7a5449/df51b240-fr.jpg?quality=80&width=320&preferwebp=truewww.oecd.org/adobe/dynamicmedia/del... https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--9b78a0e4-78f6-4dd8-90d3-8f346c7a5449/df51b240-fr.jpg?quality=80&width=320&preferwebp=true — 200 — 9.4 KiB — 20 ms — h3https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--2dc4ce87-df30-4970-93e3-d1bcfc26937f/d4623013-en.jpg?quality=80&width=320&preferwebp=truewww.oecd.org/adobe/dynamicmedia/del... https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--2dc4ce87-df30-4970-93e3-d1bcfc26937f/d4623013-en.jpg?quality=80&width=320&preferwebp=true — 200 — 11.6 KiB — 221 ms — h3https://dev.visualwebsiteoptimizer.com/j.php?a=1033969&u=https%3A%2F%2Fwww.oecd.org%2F&vn=2.1&x=truedev.visualwebsiteoptimizer.com/j.ph... https://dev.visualwebsiteoptimizer.com/j.php?a=1033969&u=https%3A%2F%2Fwww.oecd.org%2F&vn=2.1&x=true — 200 — 3.8 KiB — 53 ms — h2https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--effd2e5d-6cbc-4c04-8a10-e561b7ab8a1b/16708b78-en.jpg?quality=80&width=320&preferwebp=truewww.oecd.org/adobe/dynamicmedia/del... https://www.oecd.org/adobe/dynamicmedia/deliver/dm-aid--effd2e5d-6cbc-4c04-8a10-e561b7ab8a1b/16708b78-en.jpg?quality=80&width=320&preferwebp=true — 200 — 5.8 KiB — 229 ms — h3https://public.flourish.studio/resources/embed.jspublic.flourish.studio/resources/em... https://public.flourish.studio/resources/embed.js — 200 — 15.3 KiB — 24 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 5116ms · 960KB · €56/mo
www.oecd.org
Other
Costly
Execution 1273ms
Transfer 166 KB
Monthly Cost €14/mo
Google Tag Manager
Tag Manager
Costly
Execution 733ms
Transfer 181 KB
Unused 36%
Monthly Cost €8/mo
surveys-static-prd.survicate-cdn.com
Other
Costly
Execution 509ms
Transfer 161 KB
Unused 48%
Monthly Cost €6/mo
static-p53839-e349852.adobeaemcloud.com
Other
Costly
Execution 462ms
Transfer 33 KB
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 418ms
Transfer 0 KB
Monthly Cost €5/mo
www.oecd.org
Other
Costly
Execution 395ms
Transfer 0 KB
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 392ms
Transfer 152 KB
Unused 42%
Monthly Cost €4/mo
script.crazyegg.com
Other
Costly
Execution 351ms
Transfer 55 KB
Unused 53%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 304ms
Transfer 152 KB
Unused 43%
Monthly Cost €3/mo
public.flourish.studio
Other
Optional
Execution 103ms
Transfer 15 KB
Monthly Cost €1/mo
www.oecd.org
Other
Optional
Execution 90ms
Transfer 22 KB
Monthly Cost €1/mo
Google Analytics
Analytics
Optional
Execution 85ms
Transfer 21 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.oecd.org adds 1273ms and costs ~€14/month
  • Google Tag Manager adds 733ms and costs ~€8/month
  • surveys-static-prd.survicate-cdn.com adds 509ms and costs ~€6/month
  • static-p53839-e349852.adobeaemcloud.com adds 462ms and costs ~€5/month
  • Unattributable adds 418ms and costs ~€5/month
  • www.oecd.org adds 395ms and costs ~€4/month
  • Google Tag Manager adds 392ms and costs ~€4/month
  • script.crazyegg.com adds 351ms and costs ~€4/month
  • Google Tag Manager adds 304ms 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.

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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 1273ms 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 733ms 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

surveys-static-prd.survicate-cdn.com takes 509ms 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

static-p53839-e349852.adobeaemcloud.com takes 462ms 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

Unattributable takes 418ms 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

www.oecd.org takes 395ms 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 392ms 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

script.crazyegg.com takes 351ms 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

Google Tag Manager takes 304ms 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

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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