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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.
96
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.

2.79 s

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

7.15 s

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

12 ms

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

0.034

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

2.79 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.

10.10 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
73 resources · 1.6 MB · 249 KB savings available
FIX
73 resources · 1.6 MB · 249 KB savings available
Warning::
Page weight 619 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~249 KB of savings available
Warning::
72 third-party resources (100% of weight)
Info::
1 resources over 200KB
73 resources · 1.6 MiB · 72 third-party 618.8 KiB over 1MB target
CSS 40% · 658.1 KiB
JavaScript 32% · 523.4 KiB
Image 27% · 438.1 KiB
Document 1% · 22.1 KiB
Other 0% · 1.1 KiB

~248.8 KiB of savings available

Remove unused JavaScript: 248.8 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, 73 requests
REVIEW
1.6 MB transferred, 73 requests
Info::
Page weighs 4.0 MB (1.6 MB transferred)
Info::
CSS is 658 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 658 KB
Warning::
JavaScript is 523 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 523 KB
Info::
73 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
73 requests
0.34 g CO2 per page load
CSS 658.1 KiB 40%
JavaScript 523.4 KiB 32%
Images 432.5 KiB 26%
HTML 22.1 KiB 1%
Other 5.9 KiB 0%
Other 917 B 0%
Other 0 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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

C
Image Optimization
Action
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://european-union.europa.eu/themes/contrib/oe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://webtools.europa.eu/images/flags/eu.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 430 KB
0 oversized -0 KB
9 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

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

Source: web.dev / Core Web Vitals

B
JS Execution Cost
977ms total JS execution
REVIEW
977ms total JS execution
Warning::
https://webtools.europa.eu/load.js: 358ms CPU time
Info::
Unattributable: 250ms CPU time
Info::
https://european-union.europa.eu/index_en: 239ms CPU time
Info::
https://european-union.europa.eu/core/assets/vendo...: 68ms CPU time
Info::
https://webtools.europa.eu/css/webtools.theme-eu.c...: 63ms CPU time
Warning::
Third-party scripts: 977ms (100% of total)

Main Thread Breakdown

Script Evaluation 31% Other 30% Style & Layout 17% Script Parsing & Compilation 10% Parse HTML & CSS 9%
ScriptTotalScriptingParse/CompileParty
https://webtools.europa.eu/load.js358ms202ms28ms3rd
Unattributable250ms5ms0ms3rd
https://european-union.europa.eu/index_en239ms3ms1ms3rd
https://european-union.europa.eu/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.168ms45ms22ms3rd
https://webtools.europa.eu/css/webtools.theme-eu.css?t=cdb5c65d63ms0ms0ms3rd
C
JS Bundles
Action
27 scripts, 249 KB unused
REVIEW
27 scripts, 249 KB unused
Warning::
https://european-union.europa.eu/sites/default/fil...: 66 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://european-union.europa.eu/sites/default/fil...: 60 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://webtools.europa.eu/js/webtools.etrans.js?t...: 36 KB unused (31%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://webtools.europa.eu/load.js: 23 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://webtools.europa.eu/load.js: 23 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 249 KB
249 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://european-union.europa.eu/sites/default/files/js/js_JP6x4lPIakp0N_pEt4lfZguYmvs1ixMQFHYBOHl9z9E.js?scope=footer&delta=3&language=en&theme=ewcms_theme&include=eJxVy9EOgjAMheEXQnmkpoyTOdOtpO1A3l5BjfGu5_tTbKk61S5RpLTcWUacdHcSPiCDGrJG4SjahneNGypGJPJuK_Z_PW9uLHuU5IPiE5LWRRtakJTJ2HZC_1U8AvZ6Il_zoRumUBUfZ-sLy_W7L17ZQpRn2BOXg0xX74 KB66 KB (90%)✓3rd
https://european-union.europa.eu/sites/default/files/js/js_JP6x4lPIakp0N_pEt4lfZguYmvs1ixMQFHYBOHl9z9E.js?scope=footer&delta=3&language=en&theme=ewcms_theme&include=eJyVjdEOgzAIRX_IrZ9EsBIloWAo1bmvnzNdlj3uDc49F2jPpcJizk_TQIFC2hLm4I0gHFkGupTSJFhY54aSOsK8sF6aVsFg079kUAM5__RSLFQoUYbafKPjl14zKsoRnOtg1INsZTUljfPS6OgHUPum9AjyswR1m990pzHMpKbJ24py_-y3WtBDDCfyF6mcboQ74 KB60 KB (82%)✓3rd
https://webtools.europa.eu/js/webtools.etrans.js?t=cdb5c65d115 KB36 KB (31%)✓3rd
https://webtools.europa.eu/load.js0 KB23 KB (56%)✓3rd
https://webtools.europa.eu/load.js42 KB23 KB (56%)✓3rd
https://european-union.europa.eu/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.10 KB21 KB (77%)✓3rd
https://european-union.europa.eu/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.127 KB21 KB (77%)✓3rd
https://european-union.europa.eu/themes/contrib/oe_theme/dist/duet/duet/duet.esm.js0 KB—✓3rd
https://ec.europa.eu/wel/surveys/wr_survey03/js/main.js?9868660 KB—✓3rd
https://european-union.europa.eu/sites/default/files/js/js_vveTWHZoEhX4bTWIlnayw7kuUGewgAxDHPAy-uze0_c.js?scope=footer&delta=1&language=en&theme=ewcms_theme&include=eJxVy9EOgjAMheEXQnmkpoyTOdOtpO1A3l5BjfGu5_tTbKk61S5RpLTcWUacdHcSPiCDGrJG4SjahneNGypGJPJuK_Z_PW9uLHuU5IPiE5LWRRtakJTJ2HZC_1U8AvZ6Il_zoRumUBUfZ-sLy_W7L17ZQpRn2BOXg0xX3 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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
Network Waterfall
73 requests over 1130ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 2.8 s LCP 7.1 shttps://europa.eu// https://europa.eu/ — 301 — 250 B — 110 ms — http/1.1https://european-union.europa.eu/select-language?destination=/node/1european-union.europa.eu/select-lan... https://european-union.europa.eu/select-language?destination=/node/1 — 200 — 4.0 KiB — 69 ms — h2https://european-union.europa.eu/themes/contrib/oe_theme/dist/duet/duet/duet.esm.jseuropean-union.europa.eu/themes/con... https://european-union.europa.eu/themes/contrib/oe_theme/dist/duet/duet/duet.esm.js — 200 — 1.3 KiB — 38 ms — h2https://european-union.europa.eu/sites/default/files/css/css_LT_i7YvBHJH6fxPUytMzzsf7Y1mHRolk8UOyMYIIb7U.css?delta=0&language=en&theme=ewcms_theme&include=eJzLT40vyUjNTdVPzs8tyM9LzSuJz8lMKkosqoxPLdXJh8kWFGXmlegUVxaXpObqJyUWpwIAfvYWPweuropean-union.europa.eu/sites/defa... https://european-union.europa.eu/sites/default/files/css/css_LT_i7YvBHJH6fxPUytMzzsf7Y1mHRolk8UOyMYIIb7U.css?delta=0&language=en&theme=ewcms_theme&include=eJzLT40vyUjNTdVPzs8tyM9LzSuJz8lMKkosqoxPLdXJh8kWFGXmlegUVxaXpObqJyUWpwIAfvYWPw — 200 — 1012 B — 73 ms — h2https://european-union.europa.eu/sites/default/files/css/css_yOz2r9wAeFZ8KdkNUXJnv3YP6pAYZ6JDkS9bOh3ut7c.css?delta=1&language=en&theme=ewcms_theme&include=eJzLT40vyUjNTdVPzs8tyM9LzSuJz8lMKkosqoxPLdXJh8kWFGXmlegUVxaXpObqJyUWpwIAfvYWPweuropean-union.europa.eu/sites/defa... https://european-union.europa.eu/sites/default/files/css/css_yOz2r9wAeFZ8KdkNUXJnv3YP6pAYZ6JDkS9bOh3ut7c.css?delta=1&language=en&theme=ewcms_theme&include=eJzLT40vyUjNTdVPzs8tyM9LzSuJz8lMKkosqoxPLdXJh8kWFGXmlegUVxaXpObqJyUWpwIAfvYWPw — 200 — 7.7 KiB — 74 ms — 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https://european-union.europa.eu/sites/default/files/css/css_YPktGKCLRpETWrEFw0Y1zTuYn5ZkLXXIhr3m8T6rM0A.css?delta=5&language=en&theme=ewcms_theme&include=eJzLT40vyUjNTdVPzs8tyM9LzSuJz8lMKkosqoxPLdXJh8kWFGXmlegUVxaXpObqJyUWpwIAfvYWPw — 200 — 4.8 KiB — 73 ms — h2https://european-union.europa.eu/profiles/contrib/ewcms/modules/ewcms_multilingual/assets/js/ewcms_js_language_layover.jseuropean-union.europa.eu/profiles/c... https://european-union.europa.eu/profiles/contrib/ewcms/modules/ewcms_multilingual/assets/js/ewcms_js_language_layover.js — 200 — 506 B — 64 ms — h2https://european-union.europa.eu/themes/contrib/oe_theme/dist/eu/images/logo/condensed-version/positive/logo-eu--en.svgeuropean-union.europa.eu/themes/con... https://european-union.europa.eu/themes/contrib/oe_theme/dist/eu/images/logo/condensed-version/positive/logo-eu--en.svg — 200 — 2.1 KiB — 65 ms — h2https://european-union.europa.eu/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.1european-union.europa.eu/core/asset... https://european-union.europa.eu/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.1 — 200 — 27.5 KiB — 44 ms — h2https://european-union.europa.eu/sites/default/files/js/js_vveTWHZoEhX4bTWIlnayw7kuUGewgAxDHPAy-uze0_c.js?scope=footer&delta=1&language=en&theme=ewcms_theme&include=eJxVy9EOgjAMheEXQnmkpoyTOdOtpO1A3l5BjfGu5_tTbKk61S5RpLTcWUacdHcSPiCDGrJG4SjahneNGypGJPJuK_Z_PW9uLHuU5IPiE5LWRRtakJTJ2HZC_1U8AvZ6Il_zoRumUBUfZ-sLy_W7L17ZQpRn2BOXg0xXeuropean-union.europa.eu/sites/defa... https://european-union.europa.eu/sites/default/files/js/js_vveTWHZoEhX4bTWIlnayw7kuUGewgAxDHPAy-uze0_c.js?scope=footer&delta=1&language=en&theme=ewcms_theme&include=eJxVy9EOgjAMheEXQnmkpoyTOdOtpO1A3l5BjfGu5_tTbKk61S5RpLTcWUacdHcSPiCDGrJG4SjahneNGypGJPJuK_Z_PW9uLHuU5IPiE5LWRRtakJTJ2HZC_1U8AvZ6Il_zoRumUBUfZ-sLy_W7L17ZQpRn2BOXg0xX — 200 — 3.0 KiB — 70 ms — 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https://webtools.europa.eu/load.js — 200 — 41.6 KiB — 114 ms — h3https://european-union.europa.eu/sites/default/files/css/css_imaveOSU2l0QpIdsPP022bgbMu2z-CNKdmYl7ypA-N0.css?delta=2&language=en&theme=ewcms_theme&include=eJzLT40vyUjNTdVPzs8tyM9LzSuJz8lMKkosqoxPLdXJh8kWFGXmlegUVxaXpObqJyUWpwIAfvYWPweuropean-union.europa.eu/sites/defa... https://european-union.europa.eu/sites/default/files/css/css_imaveOSU2l0QpIdsPP022bgbMu2z-CNKdmYl7ypA-N0.css?delta=2&language=en&theme=ewcms_theme&include=eJzLT40vyUjNTdVPzs8tyM9LzSuJz8lMKkosqoxPLdXJh8kWFGXmlegUVxaXpObqJyUWpwIAfvYWPw — 200 — 5.3 KiB — 65 ms — h2https://european-union.europa.eu/sites/default/files/css/css_UCduIV1tCaxoCaYUSju6afEiPQEUSVNZJK1aZXkQo9M.css?delta=4&language=en&theme=ewcms_theme&include=eJzLT40vyUjNTdVPzs8tyM9LzSuJz8lMKkosqoxPLdXJh8kWFGXmlegUVxaXpObqJyUWpwIAfvYWPweuropean-union.europa.eu/sites/defa... 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https://www.webanalytics.europa.eu/ppms.php — 202 — 0 B — 27 ms — h2https://webtools.europa.eu/css/webtools.icons.networks.css?t=cdb5c65dwebtools.europa.eu/css/webtools.ico... https://webtools.europa.eu/css/webtools.icons.networks.css?t=cdb5c65d — 200 — 41.3 KiB — 26 ms — h3https://webtools.europa.eu/rest/service-inventorywebtools.europa.eu/rest/service-inv... https://webtools.europa.eu/rest/service-inventory — 204 — 0 B — 38 ms — h3https://webtools.europa.eu/rest/service-inventorywebtools.europa.eu/rest/service-inv... https://webtools.europa.eu/rest/service-inventory — 200 — 359 B — 35 ms — h3
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 977ms · 306KB · €11/mo
webtools.europa.eu
Other
Costly
Execution 358ms
Transfer 0 KB
Unused 56%
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 250ms
Transfer 0 KB
Monthly Cost €3/mo
european-union.europa.eu
Other
Costly
Execution 239ms
Transfer 18 KB
Monthly Cost €3/mo
european-union.europa.eu
Other
Optional
Execution 68ms
Transfer 0 KB
Unused 77%
Monthly Cost €1/mo
webtools.europa.eu
Other
Optional
Execution 63ms
Transfer 288 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • webtools.europa.eu adds 358ms and costs ~€4/month
  • Unattributable adds 250ms and costs ~€3/month
  • european-union.europa.eu adds 239ms 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

webtools.europa.eu takes 358ms 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

56% of webtools.europa.eu'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

Unattributable takes 250ms 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

european-union.europa.eu takes 239ms 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

77% of european-union.europa.eu'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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