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https://shell.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
2
REVIEW
1
PASS
10
INFO
2

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

Mobile Desktop
96
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
98
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.

899 ms

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

1.26 s

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

4 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.

899 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.

1.26 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
10 PASS 1 REVIEW 2 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 (413.3 KiB of 413.7 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
414 KB transferred, 46 requests
PASS
414 KB transferred, 46 requests
Info::
Page weighs 990 KB (414 KB transferred)
Info::
46 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
414 KB / 2.4 MB budget
414 KB transferred
46 requests
0.08 g CO2 per page load
Images 177.4 KiB 43%
JavaScript 94.4 KiB 23%
Other 65.1 KiB 16%
Fonts 59.6 KiB 14%
Other 11.0 KiB 3%
HTML 3.8 KiB 1%
CSS 1.1 KiB 0%
Other 909 B 0%
Other 225 B 0%
Other 203 B 0%
0 2.4 MB 4.9 MB
Under budget
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
14 images, 0 KB saveable
PASS
14 images, 0 KB saveable
Info::
All images are well-optimized
14 images 177 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
414ms total JS execution
PASS
414ms total JS execution
Info::
https://www.shell.com/etc.clientlibs/amidala/clien...: 193ms CPU time
Info::
Unattributable: 147ms CPU time
Info::
https://s.go-mpulse.net/boomerang/ZBS85-74AYM-EJ5D...: 74ms CPU time
Warning::
Third-party scripts: 414ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Other 34% Style & Layout 11% Parse HTML & CSS 5% Rendering 4% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://www.shell.com/etc.clientlibs/amidala/clientlibs/app.min.ACSHASH27171376424a6bda98b88805abf3049f.js193ms136ms0ms3rd
Unattributable147ms8ms0ms3rd
https://s.go-mpulse.net/boomerang/ZBS85-74AYM-EJ5D2-33X4T-WXVBD74ms34ms5ms3rd
A+
Font Loading
1 fonts (60 KB)
PASS
1 fonts (60 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

60 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 899 ms LCP 1.3 shttps://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/fonts/shell-typeface-la-heavy-221208.woff2shell-typeface-la-heavy... https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/fonts/shell-typeface-la-heavy-221208.woff2 — 59.6 KiB — 22 ms — font-display: swap
shell-typeface-la-heavy... woff2 swap
Size 60 KB
Load time 22 ms
Start 318 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+
JS Bundles
6 scripts, 0 KB unused
PASS
6 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.shell.com/etc.clientlibs/amidala/clientlibs/app.min.ACSHASH27171376424a6bda98b88805abf3049f.js42 KB—✓3rd
https://s.go-mpulse.net/boomerang/ZBS85-74AYM-EJ5D2-33X4T-WXVBD48 KB—✓3rd
https://www.shell.com/_jcr_content/root/footer/inherited/analytics_legacy_cop_1514704038.stream/1776078505458/47b01c2d6be728e95c136d280e1a0c48da6330dc/consent-banner.js3 KB—✓3rd
https://www.shell.com/_jcr_content/root/footer/inherited/analytics_legacy_cop.stream/1776078505494/01ad9e928e914e82932ddf2a2b09701e00cea09c/launch-container.js1 KB—✓3rd
https://cdn-ukwest.onetrust.com/consent/0197a67b-a15b-7659-9699-6742ded7fbdc/0197a67b-a15b-7659-9699-6742ded7fbdc.json3 KB—✓3rd
https://cdn-ukwest.onetrust.com/consent/0197a67b-a15b-7659-9699-6742ded7fbdc/01992f21-ac37-74c8-af86-804ebacb934c/en-gb.json15 KB—✓3rd
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
Page Weight Inventory
46 resources · 414 KB · 0 KB savings available
PASS
46 resources · 414 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 414 KB
Warning::
45 third-party resources (100% of weight)
46 resources · 413.7 KiB · 45 third-party Within 1MB page-weight target
Image 45% · 186.9 KiB
JavaScript 27% · 111.5 KiB
Font 14% · 59.6 KiB
Other 12% · 50.0 KiB
Document 1% · 4.6 KiB
CSS 0% · 1.1 KiB
Network Waterfall
46 requests over 1843ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 899 ms LCP 1.3 shttps://shell.com// https://shell.com/ — 301 — 443 B — 275 ms — http/1.1https://www.shell.com/www.shell.com/ https://www.shell.com/ — 200 — 3.8 KiB — 33 ms — h2https://www.shell.com/etc.clientlibs/amidala/clientlibs/app.min.ACSHASH27171376424a6bda98b88805abf3049f.jswww.shell.com/etc.clientlibs/amidal... https://www.shell.com/etc.clientlibs/amidala/clientlibs/app.min.ACSHASH27171376424a6bda98b88805abf3049f.js — 200 — 41.6 KiB — 27 ms — h2https://www.shell.com/.shelli18n.jsonwww.shell.com/.shelli18n.json https://www.shell.com/.shelli18n.json — 200 — 984 B — 20 ms — h2https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/fonts/shell-typeface-la-heavy-221208.woff2www.shell.com/etc.clientlibs/amidal... https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/fonts/shell-typeface-la-heavy-221208.woff2 — 200 — 59.6 KiB — 22 ms — h2https://www.shell.com/.model.jsonwww.shell.com/.model.json https://www.shell.com/.model.json — 200 — 4.4 KiB — 23 ms — h2https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base.ACSHASHb291465fc8d3c7bcefde74d34044b698.csswww.shell.com/etc.clientlibs/amidal... https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base.ACSHASHb291465fc8d3c7bcefde74d34044b698.css — 200 — 1.1 KiB — 15 ms — h2https://s.go-mpulse.net/boomerang/ZBS85-74AYM-EJ5D2-33X4T-WXVBDs.go-mpulse.net/boomerang/ZBS85-74A... https://s.go-mpulse.net/boomerang/ZBS85-74AYM-EJ5D2-33X4T-WXVBD — 200 — 48.4 KiB — 29 ms — h2https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/favicon/manifest.jsonwww.shell.com/etc.clientlibs/amidal... https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/favicon/manifest.json — 200 — 203 B — 36 ms — h3https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/favicon/favicon.svgwww.shell.com/etc.clientlibs/amidal... https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/favicon/favicon.svg — 200 — 721 B — 36 ms — h3https://www.shell.com/_jcr_content/root/header/inherited.model.jsonwww.shell.com/_jcr_content/root/hea... https://www.shell.com/_jcr_content/root/header/inherited.model.json — 200 — 42.5 KiB — 55 ms — h3https://www.shell.com/_jcr_content/root/footer/inherited.model.jsonwww.shell.com/_jcr_content/root/foo... https://www.shell.com/_jcr_content/root/footer/inherited.model.json — 200 — 1.1 KiB — 59 ms — h3https://c.go-mpulse.net/api/config.json?key=ZBS85-74AYM-EJ5D2-33X4T-WXVBD&d=www.shell.com&t=5922714&v=1.792.80&sl=0&si=66e22280-9688-401c-9224-2669c9257c78-tdvapl&plugins=AK,ConfigOverride,Continuity,PageParams,AutoXHR,SPA,History,Angular,Backbone,Ember,RT,PaintTiming,NavigationTiming,ResourceTiming,Memory,Akamai,EventTiming,BFCache,LOGN&acao=&ak.ai=217509c.go-mpulse.net/api/config.json?key... https://c.go-mpulse.net/api/config.json?key=ZBS85-74AYM-EJ5D2-33X4T-WXVBD&d=www.shell.com&t=5922714&v=1.792.80&sl=0&si=66e22280-9688-401c-9224-2669c9257c78-tdvapl&plugins=AK,ConfigOverride,Continuity,PageParams,AutoXHR,SPA,History,Angular,Backbone,Ember,RT,PaintTiming,NavigationTiming,ResourceTiming,Memory,Akamai,EventTiming,BFCache,LOGN&acao=&ak.ai=217509 — 200 — 909 B — 49 ms — h2https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/favicon/favicon.icowww.shell.com/etc.clientlibs/amidal... https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/favicon/favicon.ico — 200 — 4.5 KiB — 38 ms — h3https://www.shell.com/_jcr_content/root/footer/inherited/analytics_legacy_cop_1514704038.stream/1776078505458/47b01c2d6be728e95c136d280e1a0c48da6330dc/consent-banner.jswww.shell.com/_jcr_content/root/foo... https://www.shell.com/_jcr_content/root/footer/inherited/analytics_legacy_cop_1514704038.stream/1776078505458/47b01c2d6be728e95c136d280e1a0c48da6330dc/consent-banner.js — 200 — 3.2 KiB — 18 ms — h3https://www.shell.com/_jcr_content/root/footer/inherited/analytics_legacy_cop.stream/1776078505494/01ad9e928e914e82932ddf2a2b09701e00cea09c/launch-container.jswww.shell.com/_jcr_content/root/foo... https://www.shell.com/_jcr_content/root/footer/inherited/analytics_legacy_cop.stream/1776078505494/01ad9e928e914e82932ddf2a2b09701e00cea09c/launch-container.js — 200 — 1.2 KiB — 16 ms — h3data:image/svg+xml;utf-8,%3Csvg%20id%3D%22Shell_x5F_2012_x5F_PECTEN_x5F_RGB%22%20version%3D%221.1%2…data:image/svg+xml;utf-8,%3Csvg%20i... data:image/svg+xml;utf-8,%3Csvg%20id%3D%22Shell_x5F_2012_x5F_PECTEN_x5F_RGB%22%20version%3D%221.1%2… — 200 — 0 B — 0 ms — datahttps://www.shell.com/_jcr_content/root/main/section_636362255/page_header_copy_cop.shellimg.png/1774431858763/shell-welcome-forecourt-exterior.png?imdensity=1&imwidth=662&impolicy=amidala-imagewww.shell.com/_jcr_content/root/mai... https://www.shell.com/_jcr_content/root/main/section_636362255/page_header_copy_cop.shellimg.png/1774431858763/shell-welcome-forecourt-exterior.png?imdensity=1&imwidth=662&impolicy=amidala-image — 200 — 44.6 KiB — 60 ms — h3https://www.shell.com/_jcr_content/root/main/section_636362255/simple/promo_1962010312_cop_866737710.shellimg.jpeg/1774432270736/promo-card-shell-annual-reports.jpeg?imdensity=1&imwidth=392&impolicy=amidala-imagewww.shell.com/_jcr_content/root/mai... https://www.shell.com/_jcr_content/root/main/section_636362255/simple/promo_1962010312_cop_866737710.shellimg.jpeg/1774432270736/promo-card-shell-annual-reports.jpeg?imdensity=1&imwidth=392&impolicy=amidala-image — 200 — 12.7 KiB — 59 ms — h3https://www.shell.com/news-and-insights/scenarios/the-2026-energy-security-scenarios/_jcr_content/root/metadata.shellimg.jpeg/1767064506539/promo-2026-energy-security-scenarios.jpeg?imdensity=1&imwidth=392&impolicy=amidala-imagewww.shell.com/news-and-insights/sce... https://www.shell.com/news-and-insights/scenarios/the-2026-energy-security-scenarios/_jcr_content/root/metadata.shellimg.jpeg/1767064506539/promo-2026-energy-security-scenarios.jpeg?imdensity=1&imwidth=392&impolicy=amidala-image — 200 — 14.9 KiB — 103 ms — h3https://www.shell.com/content/dam/shell/icons/demo/social-instagram.svgwww.shell.com/content/dam/shell/ico... https://www.shell.com/content/dam/shell/icons/demo/social-instagram.svg — 200 — 776 B — 56 ms — h3https://www.shell.com/content/dam/shell/icons/demo/social-youtube.svgwww.shell.com/content/dam/shell/ico... https://www.shell.com/content/dam/shell/icons/demo/social-youtube.svg — 200 — 408 B — 56 ms — h3https://www.shell.com/content/dam/shell/icons/demo/social-facebook.svgwww.shell.com/content/dam/shell/ico... https://www.shell.com/content/dam/shell/icons/demo/social-facebook.svg — 200 — 227 B — 72 ms — h3https://www.shell.com/content/dam/shell/icons/demo/social-linkedin.svgwww.shell.com/content/dam/shell/ico... https://www.shell.com/content/dam/shell/icons/demo/social-linkedin.svg — 200 — 385 B — 111 ms — h3https://www.shell.com/content/dam/shell/icons/global/social/x.svgwww.shell.com/content/dam/shell/ico... https://www.shell.com/content/dam/shell/icons/global/social/x.svg — 200 — 237 B — 43 ms — h3https://www.shell.com/_jcr_content/root/main/section/promo_1962010312_cop_128671155.shellimg.jpeg/1770381607528/shell-st-fergus-gas-plant-scotland.jpeg?imdensity=1&imwidth=301&impolicy=amidala-imagewww.shell.com/_jcr_content/root/mai... https://www.shell.com/_jcr_content/root/main/section/promo_1962010312_cop_128671155.shellimg.jpeg/1770381607528/shell-st-fergus-gas-plant-scotland.jpeg?imdensity=1&imwidth=301&impolicy=amidala-image — 200 — 7.8 KiB — 80 ms — h3https://www.shell.com/_jcr_content/root/main/section/promo_copy_1380626423.shellimg.jpeg/1742207567624/our-climate-target-promo.jpeg?imdensity=1&imwidth=301&impolicy=amidala-imagewww.shell.com/_jcr_content/root/mai... https://www.shell.com/_jcr_content/root/main/section/promo_copy_1380626423.shellimg.jpeg/1742207567624/our-climate-target-promo.jpeg?imdensity=1&imwidth=301&impolicy=amidala-image — 200 — 5.9 KiB — 86 ms — h3https://www.shell.com/_jcr_content/root/main/section/promo_copy_1790846724.shellimg.jpeg/1724846627915/hero-image-man-woman-in-office.jpeg?imdensity=1&imwidth=301&impolicy=amidala-imagewww.shell.com/_jcr_content/root/mai... https://www.shell.com/_jcr_content/root/main/section/promo_copy_1790846724.shellimg.jpeg/1724846627915/hero-image-man-woman-in-office.jpeg?imdensity=1&imwidth=301&impolicy=amidala-image — 200 — 10.8 KiB — 108 ms — h3https://www.shell.com/_jcr_content/root/main/section/promo_1962010312_cop_388682223.shellimg.jpeg/1742546583873/shell-mds-plant-bintulu-2023-04.jpeg?imdensity=1&imwidth=301&impolicy=amidala-imagewww.shell.com/_jcr_content/root/mai... https://www.shell.com/_jcr_content/root/main/section/promo_1962010312_cop_388682223.shellimg.jpeg/1742546583873/shell-mds-plant-bintulu-2023-04.jpeg?imdensity=1&imwidth=301&impolicy=amidala-image — 200 — 11.8 KiB — 120 ms — h3https://www.shell.com/_jcr_content/root/main/section_732457945/simple_440402454/promo_copy.shellimg.jpeg/1717414106274/header-digitisation.jpeg?imdensity=1&imwidth=392&impolicy=amidala-imagewww.shell.com/_jcr_content/root/mai... https://www.shell.com/_jcr_content/root/main/section_732457945/simple_440402454/promo_copy.shellimg.jpeg/1717414106274/header-digitisation.jpeg?imdensity=1&imwidth=392&impolicy=amidala-image — 200 — 18.5 KiB — 61 ms — h3
0 ms 500 ms 1.0 s 1.5 s FCP 899 ms LCP 1.3 shttps://shell.com// https://shell.com/ — 301 — 443 B — 275 ms — http/1.1https://www.shell.com/www.shell.com/ https://www.shell.com/ — 200 — 3.8 KiB — 33 ms — h2https://www.shell.com/etc.clientlibs/amidala/clientlibs/app.min.ACSHASH27171376424a6bda98b88805abf3049f.jswww.shell.com/etc.clientlibs/amidal... https://www.shell.com/etc.clientlibs/amidala/clientlibs/app.min.ACSHASH27171376424a6bda98b88805abf3049f.js — 200 — 41.6 KiB — 27 ms — h2https://www.shell.com/.shelli18n.jsonwww.shell.com/.shelli18n.json https://www.shell.com/.shelli18n.json — 200 — 984 B — 20 ms — h2https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/fonts/shell-typeface-la-heavy-221208.woff2www.shell.com/etc.clientlibs/amidal... https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/fonts/shell-typeface-la-heavy-221208.woff2 — 200 — 59.6 KiB — 22 ms — h2https://www.shell.com/.model.jsonwww.shell.com/.model.json https://www.shell.com/.model.json — 200 — 4.4 KiB — 23 ms — h2https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base.ACSHASHb291465fc8d3c7bcefde74d34044b698.csswww.shell.com/etc.clientlibs/amidal... https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base.ACSHASHb291465fc8d3c7bcefde74d34044b698.css — 200 — 1.1 KiB — 15 ms — h2https://s.go-mpulse.net/boomerang/ZBS85-74AYM-EJ5D2-33X4T-WXVBDs.go-mpulse.net/boomerang/ZBS85-74A... https://s.go-mpulse.net/boomerang/ZBS85-74AYM-EJ5D2-33X4T-WXVBD — 200 — 48.4 KiB — 29 ms — h2https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/favicon/manifest.jsonwww.shell.com/etc.clientlibs/amidal... https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/favicon/manifest.json — 200 — 203 B — 36 ms — h3https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/favicon/favicon.svgwww.shell.com/etc.clientlibs/amidal... https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/favicon/favicon.svg — 200 — 721 B — 36 ms — h3https://www.shell.com/_jcr_content/root/header/inherited.model.jsonwww.shell.com/_jcr_content/root/hea... https://www.shell.com/_jcr_content/root/header/inherited.model.json — 200 — 42.5 KiB — 55 ms — h3https://www.shell.com/_jcr_content/root/footer/inherited.model.jsonwww.shell.com/_jcr_content/root/foo... https://www.shell.com/_jcr_content/root/footer/inherited.model.json — 200 — 1.1 KiB — 59 ms — h3https://c.go-mpulse.net/api/config.json?key=ZBS85-74AYM-EJ5D2-33X4T-WXVBD&d=www.shell.com&t=5922714&v=1.792.80&sl=0&si=66e22280-9688-401c-9224-2669c9257c78-tdvapl&plugins=AK,ConfigOverride,Continuity,PageParams,AutoXHR,SPA,History,Angular,Backbone,Ember,RT,PaintTiming,NavigationTiming,ResourceTiming,Memory,Akamai,EventTiming,BFCache,LOGN&acao=&ak.ai=217509c.go-mpulse.net/api/config.json?key... https://c.go-mpulse.net/api/config.json?key=ZBS85-74AYM-EJ5D2-33X4T-WXVBD&d=www.shell.com&t=5922714&v=1.792.80&sl=0&si=66e22280-9688-401c-9224-2669c9257c78-tdvapl&plugins=AK,ConfigOverride,Continuity,PageParams,AutoXHR,SPA,History,Angular,Backbone,Ember,RT,PaintTiming,NavigationTiming,ResourceTiming,Memory,Akamai,EventTiming,BFCache,LOGN&acao=&ak.ai=217509 — 200 — 909 B — 49 ms — h2https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/favicon/favicon.icowww.shell.com/etc.clientlibs/amidal... https://www.shell.com/etc.clientlibs/amidala/clientlibs/theme-base/resources/favicon/favicon.ico — 200 — 4.5 KiB — 38 ms — h3https://www.shell.com/_jcr_content/root/footer/inherited/analytics_legacy_cop_1514704038.stream/1776078505458/47b01c2d6be728e95c136d280e1a0c48da6330dc/consent-banner.jswww.shell.com/_jcr_content/root/foo... 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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 414ms · 90KB · £4/mo
www.shell.com
Other
Optional
Execution 193ms
Transfer 42 KB
Monthly Cost £2/mo
Unattributable
Other
Optional
Execution 147ms
Transfer 0 KB
Monthly Cost £2/mo
s.go-mpulse.net
Other
Optional
Execution 74ms
Transfer 48 KB
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

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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