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https://vatican.va

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
64
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

1.66 s

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

5.04 s

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

115 ms

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

0.066

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

2.38 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.

6.31 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
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
6.1 MB transferred, 94 requests
FIX
6.1 MB transferred, 94 requests
Critical::
Page weighs 12.6 MB (6.1 MB transferred)
Warning::
Images are 3.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.0 MB
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Info::
Fonts are 1.2 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.2 MB
Info::
CSS is 215 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 215 KB
Info::
94 HTTP requests
Info::
Estimated 1.3 g CO2 per page load
6.1 MB / 2.4 MB budget
6.1 MB transferred
94 requests
1.3 g CO2 per page load
Images 3.0 MiB 50%
JavaScript 1.5 MiB 24%
Fonts 1.2 MiB 20%
CSS 214.9 KiB 3%
HTML 77.2 KiB 1%
Other 35.0 KiB 1%
Other 9.0 KiB 0%
Other 549 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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

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 (6.1 MiB of 6.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
32 scripts, 391 KB unused
FIX
32 scripts, 391 KB unused
Warning::
https://www.vatican.va/etc/designs/vaticanevents/l...: 91 KB unused (86%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P8S...: 64 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P8S...: 64 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.vatican.va/etc/designs/generics2/libra...: 35 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.vatican.va/etc/designs/generics2/libra...: 35 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 391 KB
391 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.vatican.va/etc/designs/vaticanevents/library/clientlibs.min.462e7d1f2f7e05231a7d7f9f8f68e6aa.js106 KB91 KB (86%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P8S9M8D0 KB64 KB (54%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P8S9M8D118 KB64 KB (54%)✓3rd
https://www.vatican.va/etc/designs/generics2/library/clientlibs.min.3c4d948cc1ae00387817c605328e2b0b.js0 KB35 KB (87%)✓3rd
https://www.vatican.va/etc/designs/generics2/library/clientlibs.min.3c4d948cc1ae00387817c605328e2b0b.js40 KB35 KB (87%)✓3rd
https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js43 KB26 KB (60%)✓3rd
https://www.vatican.va/etc/designs/vatican/library/clientlibs.min.a048ef155d62651cae0435360a52b70c.js135 KB26 KB (20%)✓3rd
https://www.vatican.va/etc/designs/vatican/library/clientlibs.min.a048ef155d62651cae0435360a52b70c.js0 KB26 KB (20%)✓3rd
https://www.vatican.va/etc/designs/vatican/library/clientlibs/themes/homepage_popes.min.076843024fbeba3182ffc796c85edec7.js39 KB25 KB (66%)✓3rd
https://www.vatican.va/etc/designs/siv-commons-foundation/library/bootstrap/bootstrap-5-3-3/js/bootstrap.bundle.min.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
94 resources · 6.1 MB · 391 KB savings available
FIX
94 resources · 6.1 MB · 391 KB savings available
Warning::
Page weight 5.1 MB over 1MB target
Got: 6.1 MB Expected: ≤ 1 MB
Info::
~391 KB of savings available
Warning::
82 third-party resources (100% of weight)
Info::
9 resources over 200KB
94 resources · 6.1 MiB · 82 third-party 5.1 MiB over 1MB target
Image 50% · 3.0 MiB
JavaScript 24% · 1.5 MiB
Font 20% · 1.2 MiB
CSS 3% · 214.9 KiB
Document 1% · 81.7 KiB
Other 1% · 35.5 KiB

~390.8 KiB of savings available

Remove unused JavaScript: 390.8 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
Image Optimization
Action
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Warning::
https://www.vatican.va/etc/designs/vatican/library... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.vatican.va/content/vatican/en/_jcr_con... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.vatican.va/etc/designs/vatican/library... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
13 images 3.0 MB
0 oversized -0 KB
13 legacy format
3 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

C
JS Execution Cost
Action
1602ms total JS execution
REVIEW
1602ms total JS execution
Warning::
https://www.vatican.va/content/vatican/en.html: 457ms CPU time
Warning::
https://www.vatican.va/etc/designs/vatican/library...: 320ms CPU time
Warning::
https://www.vatican.va/etc/clientlibs/granite/jque...: 307ms CPU time
Info::
Unattributable: 161ms CPU time
Info::
https://cdn.jsdelivr.net/npm/swiper@11/swiper-bund...: 157ms CPU time
Warning::
Third-party scripts: 1551ms (97% of total)

Main Thread Breakdown

Style & Layout 41% Script Evaluation 28% Other 17% Script Parsing & Compilation 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.vatican.va/content/vatican/en.html457ms82ms2ms3rd
https://www.vatican.va/etc/designs/vatican/library/clientlibs/themes/homepage_popes/js/webfont.js320ms13ms1ms3rd
https://www.vatican.va/etc/clientlibs/granite/jquery.min.e0cc37eb1ac1cf9f859edde97cb8dc9f.js307ms119ms4ms3rd
Unattributable161ms20ms0ms3rd
https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js157ms55ms15ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P8S9M8D93ms71ms22ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CGNTFB4GZQ&cx=c&gtm=4e64h155ms40ms14ms3rd
https://vatican.va/etc/designs/vatican/library/clientlibs.min.a048ef155d62651cae0435360a52b70c.js51ms24ms18ms1st
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
12 fonts (1279 KB)
PASS
12 fonts (1279 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

1279 KB total

Render-blocking

0

of 12

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 4.0 s 5.0 s FCP 1.7 s LCP 5.0 shttps://www.vatican.va/etc/designs/vatican/library/clientlibs/themes/vatican-v2/fonts/Inter/Inter-VariableFont_opsz,wght.woff2Inter-VariableFont_opsz... https://www.vatican.va/etc/designs/vatican/library/clientlibs/themes/vatican-v2/fonts/Inter/Inter-VariableFont_opsz,wght.woff2 — 0 B — 48 ms — font-display: swaphttps://www.vatican.va/etc/designs/vatican/library/clientlibs/themes/vatican-v2/fonts/Inter/Inter-VariableFont_opsz,wght.woff2Inter-VariableFont_opsz... https://www.vatican.va/etc/designs/vatican/library/clientlibs/themes/vatican-v2/fonts/Inter/Inter-VariableFont_opsz,wght.woff2 — 341.3 KiB — 24 ms — font-display: swaphttps://www.vatican.va/etc/designs/vatican/library/clientlibs/themes/vatican-v2/fonts/CormorantGaramond/CormorantGaramond-MediumItalic.woffCormorantGaramond-Mediu... https://www.vatican.va/etc/designs/vatican/library/clientlibs/themes/vatican-v2/fonts/CormorantGaramond/CormorantGaramond-MediumItalic.woff — 137.6 KiB — 19 ms — font-display: swaphttps://www.vatican.va/etc/designs/vatican/library/clientlibs/themes/vatican-v2/fonts/CormorantGaramond/CormorantGaramond-Bold.woffCormorantGaramond-Bold.... https://www.vatican.va/etc/designs/vatican/library/clientlibs/themes/vatican-v2/fonts/CormorantGaramond/CormorantGaramond-Bold.woff — 202.7 KiB — 27 ms — font-display: swaphttps://www.vatican.va/etc/designs/vatican/library/clientlibs/themes/vatican-v2/fonts/CormorantGaramond/CormorantGaramond-Medium.woffCormorantGaramond-Mediu... https://www.vatican.va/etc/designs/vatican/library/clientlibs/themes/vatican-v2/fonts/CormorantGaramond/CormorantGaramond-Medium.woff — 208.9 KiB — 41 ms — font-display: swaphttps://www.vatican.va/etc/designs/vatican/library/fonts/SourceSansPro-Regular.woffSourceSansPro-Regular.woff https://www.vatican.va/etc/designs/vatican/library/fonts/SourceSansPro-Regular.woff — 128.1 KiB — 13 ms — font-display: swaphttps://www.vatican.va/etc/designs/vatican/library/fonts/TrajanPro-Regular.woffTrajanPro-Regular.woff https://www.vatican.va/etc/designs/vatican/library/fonts/TrajanPro-Regular.woff — 36.1 KiB — 16 ms — font-display: swaphttps://www.vatican.va/etc/designs/vatican/library/fonts/TrajanPro-Bold.woffTrajanPro-Bold.woff https://www.vatican.va/etc/designs/vatican/library/fonts/TrajanPro-Bold.woff — 36.5 KiB — 18 ms — font-display: swaphttps://www.vatican.va/etc/designs/vatican/library/fonts/CharlemagneStd-Bold.woffCharlemagneStd-Bold.woff https://www.vatican.va/etc/designs/vatican/library/fonts/CharlemagneStd-Bold.woff — 24.6 KiB — 15 ms — font-display: swaphttps://www.vatican.va/etc/designs/vatican/library/fonts/SourceSansPro-Semibold.woffSourceSansPro-Semibold.... https://www.vatican.va/etc/designs/vatican/library/fonts/SourceSansPro-Semibold.woff — 126.8 KiB — 27 ms — font-display: swaphttps://www.vatican.va/etc/designs/vatican/library/fonts/va-icon.woffva-icon.woff https://www.vatican.va/etc/designs/vatican/library/fonts/va-icon.woff — 2.0 KiB — 17 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 80 ms — font-display: swap
Inter-VariableFont_opsz... woff2 swap
Size 0 KB
Load time 48 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
Inter-VariableFont_opsz... woff2 swap
Size 341 KB
Load time 24 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
CormorantGaramond-Mediu... woff swap
Size 138 KB
Load time 19 ms
Start 3.2 s
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
CormorantGaramond-Bold.... woff swap
Size 203 KB
Load time 27 ms
Start 3.2 s
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
CormorantGaramond-Mediu... woff swap
Size 209 KB
Load time 41 ms
Start 3.2 s
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.woff woff swap
Size 128 KB
Load time 13 ms
Start 3.5 s
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
TrajanPro-Regular.woff woff swap
Size 36 KB
Load time 16 ms
Start 3.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
TrajanPro-Bold.woff woff swap
Size 37 KB
Load time 18 ms
Start 3.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
CharlemagneStd-Bold.woff woff swap
Size 25 KB
Load time 15 ms
Start 3.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
SourceSansPro-Semibold.... woff swap
Size 127 KB
Load time 27 ms
Start 3.7 s
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
va-icon.woff woff swap
Size 2 KB
Load time 17 ms
Start 3.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 80 ms
Start 5.6 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 ~844 KB and ~1688 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
Network Waterfall
94 requests over 6913ms
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 1.7 s LCP 5.0 shttps://vatican.va// https://vatican.va/ — 200 — 2.0 KiB — 1.9 s — http/1.1https://vatican.va/etc/clientlibs/foundation/main.min.77f07f85da93e61bb291da28df2065ac.css/etc/clientlibs/foundation/main.min... https://vatican.va/etc/clientlibs/foundation/main.min.77f07f85da93e61bb291da28df2065ac.css — 302 — 415 B — 213 ms — http/1.1https://vatican.va/etc/designs/generics2/library/clientlibs.min.25498fb47f0d5f43eead9ee78241c07f.css/etc/designs/generics2/library/clie... https://vatican.va/etc/designs/generics2/library/clientlibs.min.25498fb47f0d5f43eead9ee78241c07f.css — 302 — 425 B — 215 ms — http/1.1https://vatican.va/etc/designs/vatican/library/clientlibs.min.d71c60cfbb650e320511c7bbae5ff4bb.css/etc/designs/vatican/library/client... https://vatican.va/etc/designs/vatican/library/clientlibs.min.d71c60cfbb650e320511c7bbae5ff4bb.css — 302 — 423 B — 425 ms — http/1.1https://vatican.va/etc/clientlibs/granite/jquery.min.e0cc37eb1ac1cf9f859edde97cb8dc9f.js/etc/clientlibs/granite/jquery.min.... https://vatican.va/etc/clientlibs/granite/jquery.min.e0cc37eb1ac1cf9f859edde97cb8dc9f.js — 302 — 413 B — 427 ms — http/1.1https://vatican.va/etc/clientlibs/granite/utils.min.cd31222ac49213ace66f3568912db918.js/etc/clientlibs/granite/utils.min.c... https://vatican.va/etc/clientlibs/granite/utils.min.cd31222ac49213ace66f3568912db918.js — 302 — 412 B — 604 ms — http/1.1https://vatican.va/etc/clientlibs/granite/jquery/granite.min.e26b5f40a34d432bee3ded1ccbdc7041.js/etc/clientlibs/granite/jquery/gran... https://vatican.va/etc/clientlibs/granite/jquery/granite.min.e26b5f40a34d432bee3ded1ccbdc7041.js — 302 — 421 B — 629 ms — http/1.1https://vatican.va/etc/clientlibs/foundation/jquery.min.d7c42e4a257b8b9fe38d1c53dd20d01a.js/etc/clientlibs/foundation/jquery.m... https://vatican.va/etc/clientlibs/foundation/jquery.min.d7c42e4a257b8b9fe38d1c53dd20d01a.js — 302 — 416 B — 635 ms — http/1.1https://vatican.va/etc/clientlibs/foundation/main.min.1705fea38fedb11b0936752ffe8a5fc6.js/etc/clientlibs/foundation/main.min... https://vatican.va/etc/clientlibs/foundation/main.min.1705fea38fedb11b0936752ffe8a5fc6.js — 302 — 414 B — 637 ms — http/1.1https://vatican.va/etc/designs/generics2/library/clientlibs.min.3c4d948cc1ae00387817c605328e2b0b.js/etc/designs/generics2/library/clie... https://vatican.va/etc/designs/generics2/library/clientlibs.min.3c4d948cc1ae00387817c605328e2b0b.js — 302 — 424 B — 637 ms — http/1.1https://vatican.va/etc/designs/vatican/library/clientlibs.min.a048ef155d62651cae0435360a52b70c.js/etc/designs/vatican/library/client... https://vatican.va/etc/designs/vatican/library/clientlibs.min.a048ef155d62651cae0435360a52b70c.js — 302 — 422 B — 648 ms — http/1.1https://www.vatican.va/etc/clientlibs/foundation/main.min.77f07f85da93e61bb291da28df2065ac.csswww.vatican.va/etc/clientlibs/found... 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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
97% of JavaScript execution is third-party
First-party Third-party 1551ms · 221KB · $21/mo
www.vatican.va
Other
Costly
Execution 457ms
Transfer 19 KB
Monthly Cost $6/mo
www.vatican.va
Other
Costly
Execution 320ms
Transfer 7 KB
Monthly Cost $4/mo
www.vatican.va
Other
Costly
Execution 307ms
Transfer 0 KB
Monthly Cost $4/mo
Unattributable
Other
Optional
Execution 161ms
Transfer 0 KB
Monthly Cost $2/mo
jsDelivr
CDN
Optional
Execution 157ms
Transfer 43 KB
Unused 60%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 93ms
Transfer 0 KB
Unused 54%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 55ms
Transfer 152 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.vatican.va adds 457ms and costs ~$6/month
  • www.vatican.va adds 320ms and costs ~$4/month
  • www.vatican.va adds 307ms and costs ~$4/month

97% 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.vatican.va takes 457ms 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.vatican.va takes 320ms 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.vatican.va takes 307ms 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

60% of jsDelivr'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

54% of Google Tag Manager'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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