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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
81
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
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.
77
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.

867 ms

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

3.30 s

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

0 ms

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

0.000

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

867 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

3.30 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
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 52 requests
FIX
4.7 MB transferred, 52 requests
Critical::
Page weighs 6.1 MB (4.7 MB transferred)
Warning::
Images are 4.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.2 MB
Info::
52 HTTP requests
Info::
Estimated 0.99 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
52 requests
0.99 g CO2 per page load
Images 4.2 MiB 89%
JavaScript 204.3 KiB 4%
Fonts 181.5 KiB 4%
CSS 65.0 KiB 1%
Other 61.4 KiB 1%
Other 22.3 KiB 0%
HTML 10.0 KiB 0%
Other 1.3 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

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 (4.7 MiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
52 resources · 4.7 MB · 65 KB savings available
FIX
52 resources · 4.7 MB · 65 KB savings available
Warning::
Page weight 3.7 MB over 1MB target
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~65 KB of savings available
Warning::
51 third-party resources (100% of weight)
Info::
9 resources over 200KB
52 resources · 4.7 MiB · 51 third-party 3.7 MiB over 1MB target
Image 89% · 4.2 MiB
JavaScript 4% · 204.3 KiB
Font 4% · 181.5 KiB
CSS 3% · 126.3 KiB
Document 0% · 10.0 KiB
Other 0% · 1.5 KiB

~65.0 KiB of savings available

Remove unused JavaScript: 65.0 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
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
https://www.stellantis.com/content/dam/stellantis-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stellantis.com/content/dam/stellantis-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stellantis.com/content/dam/stellantis-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stellantis.com/content/dam/stellantis-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stellantis.com/content/dam/stellantis-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stellantis.com/content/dam/stellantis-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stellantis.com/content/dam/stellantis-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stellantis.com/content/dam/stellantis-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stellantis.com/content/dam/stellantis-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 4.2 MB
0 oversized -0 KB
16 legacy format
9 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

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

B
JS Bundles
8 scripts, 65 KB unused
REVIEW
8 scripts, 65 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-59X...: 65 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.stellantis.com/etc.clientlibs/stellant...: unminified — 5 KB could be saved
Info::
Total unused JavaScript: 65 KB
65 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-59X4WML129 KB65 KB (51%)✓3rd
https://cookielaw.emea.fcagroup.com/CookieLawProduct/resources/generatejs?key=27620 KB—✓3rd
https://kit.fontawesome.com/750b28e362.js6 KB—✓3rd
https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-vendors/resources/jquery-3.5.1.min.js30 KB—✓3rd
https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-site.min.js12 KB—✗3rd
https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-site-page.min.js4 KB—✓3rd
https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-base.min.js0 KB—✓3rd
https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-vendors.min.js23 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

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+
JS Execution Cost
293ms total JS execution
PASS
293ms total JS execution
Info::
https://www.stellantis.com/en: 119ms CPU time
Info::
Unattributable: 90ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-59X...: 84ms CPU time
Warning::
Third-party scripts: 293ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Other 28% Style & Layout 24% Script Parsing & Compilation 4% Rendering 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.stellantis.com/en119ms2ms0ms3rd
Unattributable90ms3ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-59X4WML84ms73ms10ms3rd
A+
Font Loading
12 fonts (181 KB)
PASS
12 fonts (181 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

181 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 FCP 867 ms LCP 3.3 shttps://fonts.gstatic.com/s/encodesanscondensed/v11/j8_46_LD37rqfuwxyIuaZhE6cRXOLtm2gfT-WYuZAC4ICHiYFQ.woff2j8_46_LD37rqfuwxyIuaZhE... https://fonts.gstatic.com/s/encodesanscondensed/v11/j8_46_LD37rqfuwxyIuaZhE6cRXOLtm2gfT-WYuZAC4ICHiYFQ.woff2 — 16.4 KiB — 59 ms — font-display: swaphttps://fonts.gstatic.com/s/encodesans/v23/LDIhapOFNxEwR-Bd1O9uYNmnUQomAgE25imKSbHLSMA6Sw_lSg.woff2LDIhapOFNxEwR-Bd1O9uYNm... https://fonts.gstatic.com/s/encodesans/v23/LDIhapOFNxEwR-Bd1O9uYNmnUQomAgE25imKSbHLSMA6Sw_lSg.woff2 — 28.1 KiB — 61 ms — font-display: swaphttps://fonts.gstatic.com/s/encodesanscondensed/v11/j8_16_LD37rqfuwxyIuaZhE6cRXOLtm2gfT2hq-MLQwFIg.woff2j8_16_LD37rqfuwxyIuaZhE... https://fonts.gstatic.com/s/encodesanscondensed/v11/j8_16_LD37rqfuwxyIuaZhE6cRXOLtm2gfT2hq-MLQwFIg.woff2 — 16.4 KiB — 51 ms — font-display: swaphttps://fonts.gstatic.com/s/encodesanscondensed/v11/j8_46_LD37rqfuwxyIuaZhE6cRXOLtm2gfT-dYyZAC4ICHiYFQ.woff2j8_46_LD37rqfuwxyIuaZhE... https://fonts.gstatic.com/s/encodesanscondensed/v11/j8_46_LD37rqfuwxyIuaZhE6cRXOLtm2gfT-dYyZAC4ICHiYFQ.woff2 — 16.3 KiB — 36 ms — font-display: swaphttps://fonts.gstatic.com/s/encodesanssemicondensed/v11/3qT4oiKqnDuUtQUEHMoXcmspmy55SFWrXFRp9FTOG1yW9MRtRdjo.woff23qT4oiKqnDuUtQUEHMoXcms... https://fonts.gstatic.com/s/encodesanssemicondensed/v11/3qT4oiKqnDuUtQUEHMoXcmspmy55SFWrXFRp9FTOG1yW9MRtRdjo.woff2 — 16.5 KiB — 45 ms — font-display: swaphttps://fonts.gstatic.com/s/encodesanssemicondensed/v11/3qT7oiKqnDuUtQUEHMoXcmspmy55SFWrXFRp9FTOG1RJ0NFAZ9XCT0mq.woff23qT7oiKqnDuUtQUEHMoXcms... https://fonts.gstatic.com/s/encodesanssemicondensed/v11/3qT7oiKqnDuUtQUEHMoXcmspmy55SFWrXFRp9FTOG1RJ0NFAZ9XCT0mq.woff2 — 16.6 KiB — 39 ms — font-display: swaphttps://fonts.gstatic.com/s/encodesanssemiexpanded/v20/ke83OhAPMEZs-BDuzwftTNJ85JvwMOzE9d9Cca5TO401LgrjKXY.woff2ke83OhAPMEZs-BDuzwftTNJ... https://fonts.gstatic.com/s/encodesanssemiexpanded/v20/ke83OhAPMEZs-BDuzwftTNJ85JvwMOzE9d9Cca5TO401LgrjKXY.woff2 — 16.7 KiB — 42 ms — font-display: swapdata:font/woff2;base64,d09GMgABAAAAAAPUAAoAAAAABuQAAAOLAAAPAAAAAAAAAAAAAAAAAAAAAAAAAAAAATgCJAQgBmAD…woff2;base64,d09GMgABAA... data:font/woff2;base64,d09GMgABAAAAAAPUAAoAAAAABuQAAAOLAAAPAAAAAAAAAAAAAAAAAAAAAAAAAAAAATgCJAQgBmAD… — 980 B — 15 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-solid-900-5.10.2.woff2pro-fa-solid-900-5.10.2... https://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-solid-900-5.10.2.woff2 — 13.1 KiB — 37 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-brands-400-5.0.0.woff2pro-fa-brands-400-5.0.0... https://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-brands-400-5.0.0.woff2 — 37.1 KiB — 34 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-brands-400-5.8.2.woff2pro-fa-brands-400-5.8.2... https://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-brands-400-5.8.2.woff2 — 2.4 KiB — 40 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-brands-400-5.8.1.woff2pro-fa-brands-400-5.8.1... https://ka-p.fontawesome.com/releases/v5.15.4/webfonts/pro-fa-brands-400-5.8.1.woff2 — 1019 B — 38 ms — font-display: swap
j8_46_LD37rqfuwxyIuaZhE... woff2 swap
Size 16 KB
Load time 59 ms
Start 210 ms
Risk FOUT — text flashes from fallback to web font
LDIhapOFNxEwR-Bd1O9uYNm... woff2 swap
Size 28 KB
Load time 61 ms
Start 211 ms
Risk FOUT — text flashes from fallback to web font
j8_16_LD37rqfuwxyIuaZhE... woff2 swap
Size 16 KB
Load time 51 ms
Start 211 ms
Risk FOUT — text flashes from fallback to web font
j8_46_LD37rqfuwxyIuaZhE... woff2 swap
Size 16 KB
Load time 36 ms
Start 259 ms
Risk FOUT — text flashes from fallback to web font
3qT4oiKqnDuUtQUEHMoXcms... woff2 swap
Size 16 KB
Load time 45 ms
Start 260 ms
Risk FOUT — text flashes from fallback to web font
3qT7oiKqnDuUtQUEHMoXcms... woff2 swap
Size 17 KB
Load time 39 ms
Start 260 ms
Risk FOUT — text flashes from fallback to web font
ke83OhAPMEZs-BDuzwftTNJ... woff2 swap
Size 17 KB
Load time 42 ms
Start 261 ms
Risk FOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA... woff2 swap
Size 1 KB
Load time 15 ms
Start 385 ms
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-5.10.2... woff2 swap
Size 13 KB
Load time 37 ms
Start 396 ms
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-5.0.0... woff2 swap
Size 37 KB
Load time 34 ms
Start 397 ms
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-5.8.2... woff2 swap
Size 2 KB
Load time 40 ms
Start 397 ms
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-5.8.1... woff2 swap
Size 1 KB
Load time 38 ms
Start 397 ms
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
Network Waterfall
52 requests over 515ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 867 ms LCP 3.3 shttps://stellantis.com// https://stellantis.com/ — 301 — 92 B — 51 ms — http/1.1https://www.stellantis.com/www.stellantis.com/ https://www.stellantis.com/ — 302 — 128 B — 13 ms — h2https://www.stellantis.com/enwww.stellantis.com/en https://www.stellantis.com/en — 200 — 10.0 KiB — 10 ms — h2https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-base.min.4fb628f2edf7b457c6ec0b16fbabb054.csswww.stellantis.com/etc.clientlibs/s... https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-base.min.4fb628f2edf7b457c6ec0b16fbabb054.css — 200 — 4.6 KiB — 14 ms — h3https://cookielaw.emea.fcagroup.com/CookieLawProduct/resources/generatecss?key=2762cookielaw.emea.fcagroup.com/CookieL... https://cookielaw.emea.fcagroup.com/CookieLawProduct/resources/generatecss?key=2762 — -1 — 0 B — 36 ms — https://cookielaw.emea.fcagroup.com/CookieLawProduct/resources/generatejs?key=2762cookielaw.emea.fcagroup.com/CookieL... https://cookielaw.emea.fcagroup.com/CookieLawProduct/resources/generatejs?key=2762 — -1 — 0 B — 37 ms — https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-vendors.min.bcfc532db41e595a30da2cd43ebb92dc.csswww.stellantis.com/etc.clientlibs/s... https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-vendors.min.bcfc532db41e595a30da2cd43ebb92dc.css — 200 — 27.2 KiB — 27 ms — h3https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-site.min.4ad9c87b56619bd472dfd55bdc5ceb46.csswww.stellantis.com/etc.clientlibs/s... https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-site.min.4ad9c87b56619bd472dfd55bdc5ceb46.css — 200 — 5.5 KiB — 26 ms — h3https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-site-page.min.170b2fc4d013874d793cbb6a0b34c35a.csswww.stellantis.com/etc.clientlibs/s... https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-site-page.min.170b2fc4d013874d793cbb6a0b34c35a.css — 200 — 19.4 KiB — 26 ms — h3https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-site-mobile.min.6d96abc6f70cf63d9974c751e6fd9e02.csswww.stellantis.com/etc.clientlibs/s... https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-site-mobile.min.6d96abc6f70cf63d9974c751e6fd9e02.css — 200 — 6.2 KiB — 27 ms — h3https://fonts.googleapis.com/css2?family=Encode+Sans+Condensed:wght@100;200;300;400;500;600;700;800;900&family=Encode+Sans+Semi+Condensed:wght@100;200;300;400;500;600;700;800;900&family=Encode+Sans+Semi+Expanded:wght@100;200;300;400;500;600;700;800;900&family=Encode+Sans:wght@100..900&display=swapfonts.googleapis.com/css2?family=En... https://fonts.googleapis.com/css2?family=Encode+Sans+Condensed:wght@100;200;300;400;500;600;700;800;900&family=Encode+Sans+Semi+Condensed:wght@100;200;300;400;500;600;700;800;900&family=Encode+Sans+Semi+Expanded:wght@100;200;300;400;500;600;700;800;900&family=Encode+Sans:wght@100..900&display=swap — 200 — 1.9 KiB — 92 ms — h2https://kit.fontawesome.com/750b28e362.jskit.fontawesome.com/750b28e362.js https://kit.fontawesome.com/750b28e362.js — 200 — 5.7 KiB — 89 ms — h2https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-vendors/resources/jquery-3.5.1.min.jswww.stellantis.com/etc.clientlibs/s... https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-vendors/resources/jquery-3.5.1.min.js — 200 — 29.8 KiB — 27 ms — h3https://www.stellantis.com/content/dam/stellantis-corporate/assets/stell-logo-blue.svgwww.stellantis.com/content/dam/stel... https://www.stellantis.com/content/dam/stellantis-corporate/assets/stell-logo-blue.svg — 200 — 1.6 KiB — 20 ms — h3https://www.stellantis.com/content/dam/stellantis-corporate/icon/arrow-diagonal.svgwww.stellantis.com/content/dam/stel... https://www.stellantis.com/content/dam/stellantis-corporate/icon/arrow-diagonal.svg — 200 — 325 B — 24 ms — h3https://www.stellantis.com/content/dam/stellantis-corporate/icon/menu/icon-search.svgwww.stellantis.com/content/dam/stel... https://www.stellantis.com/content/dam/stellantis-corporate/icon/menu/icon-search.svg — 200 — 264 B — 13 ms — h3https://www.stellantis.com/content/dam/stellantis-corporate/icon/menu/Icon-close-menu.svgwww.stellantis.com/content/dam/stel... https://www.stellantis.com/content/dam/stellantis-corporate/icon/menu/Icon-close-menu.svg — 200 — 230 B — 12 ms — h3https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-site.min.jswww.stellantis.com/etc.clientlibs/s... https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-site.min.js — 200 — 12.3 KiB — 11 ms — h3https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-site-page.min.jswww.stellantis.com/etc.clientlibs/s... https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-site-page.min.js — 200 — 4.3 KiB — 9 ms — h3https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-base.min.jswww.stellantis.com/etc.clientlibs/s... https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-base.min.js — 200 — 24 B — 16 ms — h3https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-vendors.min.jswww.stellantis.com/etc.clientlibs/s... https://www.stellantis.com/etc.clientlibs/stellantis-corporate/clientlibs/clientlib-vendors.min.js — 200 — 23.2 KiB — 11 ms — h3https://www.stellantis.com/content/dam/stellantis-corporate/icon/menu/icon-stella.svgwww.stellantis.com/content/dam/stel... https://www.stellantis.com/content/dam/stellantis-corporate/icon/menu/icon-stella.svg — 200 — 233 B — 9 ms — h3https://www.stellantis.com/content/dam/stellantis-corporate/icon/menu/esc.svgwww.stellantis.com/content/dam/stel... https://www.stellantis.com/content/dam/stellantis-corporate/icon/menu/esc.svg — 200 — 370 B — 18 ms — h3https://ka-p.fontawesome.com/releases/v5.15.4/css/pro.min.css?token=750b28e362ka-p.fontawesome.com/releases/v5.15... https://ka-p.fontawesome.com/releases/v5.15.4/css/pro.min.css?token=750b28e362 — 200 — 53.2 KiB — 54 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 293ms · 139KB · €3/mo
www.stellantis.com
Other
Optional
Execution 119ms
Transfer 10 KB
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 90ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 84ms
Transfer 129 KB
Unused 51%
Monthly Cost €1/mo

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

51% 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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