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https://trenitalia.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.
92
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.

896 ms

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

2.98 s

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

118 ms

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

0.047

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

1.45 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.

3.28 s

Page Load Progression

488 ms
975 ms
1.5 s
2.0 s
2.4 s
2.9 s
3.4 s
3.9 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
3.3 MB transferred, 72 requests
FIX
3.3 MB transferred, 72 requests
Warning::
Page weighs 8.2 MB (3.3 MB transferred)
Warning::
Images are 2.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.1 MB
Warning::
JavaScript is 633 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 633 KB
Info::
Fonts are 296 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 296 KB
Info::
72 HTTP requests
Info::
Estimated 0.70 g CO2 per page load
3.3 MB / 2.4 MB budget
3.3 MB transferred
72 requests
0.70 g CO2 per page load
Images 2.1 MiB 63%
JavaScript 632.6 KiB 19%
Fonts 295.5 KiB 9%
Other 151.7 KiB 4%
CSS 95.0 KiB 3%
Other 48.6 KiB 1%
HTML 48.3 KiB 1%
Other 1.2 KiB 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

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 (3.3 MiB of 3.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
22 scripts, 327 KB unused
FIX
22 scripts, 327 KB unused
Warning::
https://www.trenitalia.com/etc.clientlibs/trenital...: 148 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.trenitalia.com/etc.clientlibs/trenital...: unminified — 48 KB could be saved
Warning::
https://cdn.cookielaw.org/scripttemplates/202603.1...: 62 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.raffle.ai/search/index.js: 53 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/f7c60cc22ee3/67305c019...: 41 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.trenitalia.com/etc.clientlibs/clientli...: 23 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 327 KB
327 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-site.lc-69b36a9599d33ce92a87c3410573f7f5-lc.min.js205 KB148 KB (72%)✗3rd
https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js130 KB62 KB (48%)✓3rd
https://cdn.raffle.ai/search/index.js112 KB53 KB (48%)✓3rd
https://assets.adobedtm.com/f7c60cc22ee3/67305c01944a/launch-EN2aef38628cf5447e9c07c7801d13be4b.min.js82 KB41 KB (50%)✓3rd
https://www.trenitalia.com/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.js35 KB23 KB (66%)✓3rd
https://www.trenitalia.com/etc.clientlibs/cq/personalization/clientlib/personalization/integrations/commons.lc-5370019fd157d93202ac2d6f771f04b8-lc.min.js1 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/202603.1.0/otTCF.js18 KB—✓3rd
https://assets.adobedtm.com/extensions/EPc7341b33570d4c988798fc9f0093d4b2/AppMeasurement.min.js13 KB—✓3rd
https://assets.adobedtm.com/extensions/EPc7341b33570d4c988798fc9f0093d4b2/AppMeasurement_Module_ActivityMap.min.js2 KB—✓3rd
https://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-launch.lc-34b7286186b08b9b3b6d4b59b08d465a-lc.min.js1 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
72 resources · 3.3 MB · 327 KB savings available
FIX
72 resources · 3.3 MB · 327 KB savings available
Warning::
Page weight 2.3 MB over 1MB target
Got: 3.3 MB Expected: ≤ 1 MB
Info::
~327 KB of savings available
Warning::
71 third-party resources (100% of weight)
Info::
5 resources over 200KB
72 resources · 3.3 MiB · 71 third-party 2.3 MiB over 1MB target
Image 63% · 2.1 MiB
JavaScript 19% · 632.6 KiB
Font 9% · 295.5 KiB
Other 6% · 195.3 KiB
CSS 3% · 99.7 KiB
Document 1% · 48.3 KiB

~327.2 KiB of savings available

Remove unused JavaScript: 327.2 KiB
C
Image Optimization
Action
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
https://www.trenitalia.com/content/dam/trenitalia/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.trenitalia.com/etc.clientlibs/trenital... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.trenitalia.com/content/dam/trenitalia/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.trenitalia.com/etc.clientlibs/trenital... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.trenitalia.com/content/dam/trenitalia/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.trenitalia.com/etc.clientlibs/trenital... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26 images 2.1 MB
0 oversized -0 KB
14 legacy format
6 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

C
JS Execution Cost
Action
1600ms total JS execution
REVIEW
1600ms total JS execution
Warning::
https://www.trenitalia.com/it.html: 616ms CPU time
Warning::
https://www.trenitalia.com/etc.clientlibs/trenital...: 275ms CPU time
Info::
Unattributable: 241ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202603.1...: 143ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202603.1...: 137ms CPU time
Warning::
Third-party scripts: 1600ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 32% Style & Layout 9% Rendering 7% Script Parsing & Compilation 6% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://www.trenitalia.com/it.html616ms24ms3ms3rd
https://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-site.lc-69b36a9599d33ce92a87c3410573f7f5-lc.min.js275ms174ms42ms3rd
Unattributable241ms5ms0ms3rd
https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js143ms99ms22ms3rd
https://cdn.cookielaw.org/scripttemplates/202603.1.0/otTCF.js137ms119ms3ms3rd
https://assets.adobedtm.com/f7c60cc22ee3/67305c01944a/launch-EN2aef38628cf5447e9c07c7801d13be4b.min.js73ms56ms14ms3rd
https://cdn.cookielaw.org/consent/40754f7e-8d13-4b19-815c-f67996bfd76f/OtAutoBlock.js58ms51ms1ms3rd
https://cdn.raffle.ai/search/index.js58ms40ms18ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0
REVIEW
max-age=0
Info::
Cache-Control header is set
Got: max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
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
5 fonts (296 KB)
PASS
5 fonts (296 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

296 KB total

Render-blocking

0

of 5

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 896 ms LCP 3.0 shttps://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-site/resources/fonts/Poppins-Medium.ttfPoppins-Medium.ttf https://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-site/resources/fonts/Poppins-Medium.ttf — 68.8 KiB — 35 ms — font-display: swaphttps://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-site/resources/fonts/Poppins-Regular.ttfPoppins-Regular.ttf https://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-site/resources/fonts/Poppins-Regular.ttf — 69.6 KiB — 49 ms — font-display: swaphttps://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-site/resources/fonts/fs-icon.ttf?50by97fs-icon.ttf https://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-site/resources/fonts/fs-icon.ttf?50by97 — 19.1 KiB — 25 ms — font-display: swaphttps://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-site/resources/fonts/Poppins-Bold.ttfPoppins-Bold.ttf https://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-site/resources/fonts/Poppins-Bold.ttf — 68.7 KiB — 49 ms — font-display: swaphttps://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-site/resources/fonts/Poppins-SemiBold.ttfPoppins-SemiBold.ttf https://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-site/resources/fonts/Poppins-SemiBold.ttf — 69.3 KiB — 11 ms — font-display: swap
Poppins-Medium.ttf ttf swap
Size 69 KB
Load time 35 ms
Start 485 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Poppins-Regular.ttf ttf swap
Size 70 KB
Load time 49 ms
Start 485 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fs-icon.ttf ttf swap
Size 19 KB
Load time 25 ms
Start 487 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Poppins-Bold.ttf ttf swap
Size 69 KB
Load time 49 ms
Start 487 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Poppins-SemiBold.ttf ttf swap
Size 69 KB
Load time 11 ms
Start 618 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~89 KB and ~178 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
72 requests over 1581ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 896 ms LCP 3.0 shttps://trenitalia.com// https://trenitalia.com/ — 301 — 100 B — 19 ms — h2https://www.trenitalia.com/www.trenitalia.com/ https://www.trenitalia.com/ — 301 — 105 B — 17 ms — h2https://www.trenitalia.com/it.htmlwww.trenitalia.com/it.html https://www.trenitalia.com/it.html — 200 — 48.3 KiB — 12 ms — h2https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/micro.jsrum.hlx.page/.rum/@adobe/helix-rum-... https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js — 200 — 1.1 KiB — 25 ms — h2https://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-base.lc-4fb628f2edf7b457c6ec0b16fbabb054-lc.min.csswww.trenitalia.com/etc.clientlibs/t... https://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-base.lc-4fb628f2edf7b457c6ec0b16fbabb054-lc.min.css — 200 — 5.6 KiB — 11 ms — h2https://cdn.cookielaw.org/consent/40754f7e-8d13-4b19-815c-f67996bfd76f/OtAutoBlock.jscdn.cookielaw.org/consent/40754f7e-... https://cdn.cookielaw.org/consent/40754f7e-8d13-4b19-815c-f67996bfd76f/OtAutoBlock.js — 200 — 4.2 KiB — 28 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 8.8 KiB — 10 ms — h2https://cdn.cookielaw.org/consent/40754f7e-8d13-4b19-815c-f67996bfd76f/40754f7e-8d13-4b19-815c-f67996bfd76f.jsoncdn.cookielaw.org/consent/40754f7e-... https://cdn.cookielaw.org/consent/40754f7e-8d13-4b19-815c-f67996bfd76f/40754f7e-8d13-4b19-815c-f67996bfd76f.json — 200 — 2.4 KiB — 26 ms — h2https://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-launch.lc-34b7286186b08b9b3b6d4b59b08d465a-lc.min.jswww.trenitalia.com/etc.clientlibs/t... https://www.trenitalia.com/etc.clientlibs/trenitalia/clientlibs/clientlib-launch.lc-34b7286186b08b9b3b6d4b59b08d465a-lc.min.js — 200 — 796 B — 14 ms — h2https://assets.adobedtm.com/f7c60cc22ee3/67305c01944a/launch-EN2aef38628cf5447e9c07c7801d13be4b.min.jsassets.adobedtm.com/f7c60cc22ee3/67... https://assets.adobedtm.com/f7c60cc22ee3/67305c01944a/launch-EN2aef38628cf5447e9c07c7801d13be4b.min.js — 200 — 81.6 KiB — 19 ms — h2https://www.trenitalia.com/etc.clientlibs/cq/testandtarget/clientlibs/testandtarget/parameters.lc-775c9eb7ff4c48025fbe3d707bcf5f55-lc.min.jswww.trenitalia.com/etc.clientlibs/c... https://www.trenitalia.com/etc.clientlibs/cq/testandtarget/clientlibs/testandtarget/parameters.lc-775c9eb7ff4c48025fbe3d707bcf5f55-lc.min.js — 200 — 453 B — 9 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 288 B — 30 ms — h2https://www.trenitalia.com/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.jswww.trenitalia.com/etc.clientlibs/c... https://www.trenitalia.com/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.js — 200 — 35.3 KiB — 11 ms — h2https://dpm.demdex.net/id?d_visid_ver=5.3.0&d_fieldgroup=MC&d_rtbd=json&d_ver=2&d_orgid=0D5215F354E6C24C0A4C98A4%40AdobeOrg&d_nsid=0&d_coppa=true&ts=1776896250165dpm.demdex.net/id?d_visid_ver=5.3.0... https://dpm.demdex.net/id?d_visid_ver=5.3.0&d_fieldgroup=MC&d_rtbd=json&d_ver=2&d_orgid=0D5215F354E6C24C0A4C98A4%40AdobeOrg&d_nsid=0&d_coppa=true&ts=1776896250165 — 200 — 669 B — 61 ms — h2https://assets.adobedtm.com/extensions/EPc7341b33570d4c988798fc9f0093d4b2/AppMeasurement.min.jsassets.adobedtm.com/extensions/EPc7... https://assets.adobedtm.com/extensions/EPc7341b33570d4c988798fc9f0093d4b2/AppMeasurement.min.js — 200 — 12.9 KiB — 7 ms — h2https://assets.adobedtm.com/extensions/EPc7341b33570d4c988798fc9f0093d4b2/AppMeasurement_Module_ActivityMap.min.jsassets.adobedtm.com/extensions/EPc7... https://assets.adobedtm.com/extensions/EPc7341b33570d4c988798fc9f0093d4b2/AppMeasurement_Module_ActivityMap.min.js — 200 — 1.8 KiB — 5 ms — h2https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.jscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js — 200 — 129.9 KiB — 30 ms — h2https://www.trenitalia.com/etc.clientlibs/cq/personalization/clientlib/personalization/integrations/commons.lc-5370019fd157d93202ac2d6f771f04b8-lc.min.jswww.trenitalia.com/etc.clientlibs/c... https://www.trenitalia.com/etc.clientlibs/cq/personalization/clientlib/personalization/integrations/commons.lc-5370019fd157d93202ac2d6f771f04b8-lc.min.js — 200 — 1.1 KiB — 10 ms — h2https://www.trenitalia.com/etc.clientlibs/cq/testandtarget/clientlibs/testandtarget/atjs-integration.lc-401aa9ea1dd109fe7762186a74ae6c2b-lc.min.jswww.trenitalia.com/etc.clientlibs/c... 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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 1600ms · 599KB · €8/mo
www.trenitalia.com
Other
Costly
Execution 616ms
Transfer 48 KB
Monthly Cost €3/mo
www.trenitalia.com
Other
Costly
Execution 275ms
Transfer 205 KB
Unused 72%
Monthly Cost €1/mo
Unattributable
Other
Costly
Execution 241ms
Transfer 0 KB
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 143ms
Transfer 130 KB
Unused 48%
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 137ms
Transfer 18 KB
Monthly Cost €1/mo
assets.adobedtm.com
Other
Optional
Execution 73ms
Transfer 82 KB
Unused 50%
Monthly Cost €0/mo
OneTrust
Consent
Essential
Execution 58ms
Transfer 4 KB
Monthly Cost €0/mo
cdn.raffle.ai
Other
Optional
Execution 58ms
Transfer 112 KB
Unused 48%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www.trenitalia.com adds 616ms and costs ~€3/month
  • www.trenitalia.com adds 275ms and costs ~€1/month
  • Unattributable adds 241ms and costs ~€1/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.trenitalia.com takes 616ms 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.trenitalia.com takes 275ms 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

72% of www.trenitalia.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

Unattributable takes 241ms 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

50% of assets.adobedtm.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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