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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
2
REVIEW
2
PASS
11
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.
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.

2.52 s

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

4.72 s

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

106 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.

2.52 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.

4.73 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
11 PASS 2 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 (472.3 KiB of 472.7 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
JS Execution Cost
Action
1699ms total JS execution
REVIEW
1699ms total JS execution
Warning::
https://www.shell.com/etc.clientlibs/amidala/clien...: 771ms CPU time
Warning::
Unattributable: 538ms CPU time
Warning::
https://s.go-mpulse.net/boomerang/ZBS85-74AYM-EJ5D...: 258ms CPU time
Info::
https://www.shell.com/: 131ms CPU time
Warning::
Third-party scripts: 1699ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 33% Style & Layout 11% Rendering 4% Garbage Collection 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.shell.com/etc.clientlibs/amidala/clientlibs/app.min.ACSHASH27171376424a6bda98b88805abf3049f.js771ms552ms1ms3rd
Unattributable538ms18ms0ms3rd
https://s.go-mpulse.net/boomerang/ZBS85-74AYM-EJ5D2-33X4T-WXVBD258ms126ms21ms3rd
https://www.shell.com/131ms10ms2ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
473 KB transferred, 39 requests
PASS
473 KB transferred, 39 requests
Info::
Page weighs 1015 KB (473 KB transferred)
Info::
39 HTTP requests
Info::
Estimated 0.10 g CO2 per page load
473 KB / 2.4 MB budget
473 KB transferred
39 requests
0.10 g CO2 per page load
Images 236.5 KiB 50%
JavaScript 94.4 KiB 20%
Other 65.1 KiB 14%
Fonts 59.6 KiB 13%
Other 11.0 KiB 2%
HTML 3.8 KiB 1%
CSS 1.1 KiB 0%
Other 908 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
8 images, 0 KB saveable
PASS
8 images, 0 KB saveable
Info::
All images are well-optimized
8 images 236 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
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 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.5 s LCP 4.7 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 — 33 ms — font-display: swap
shell-typeface-la-heavy... woff2 swap
Size 60 KB
Load time 33 ms
Start 327 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
—
preload
4
dns-prefetch
—
prefetch
—

4 resource hints configured

A
Page Weight Inventory
39 resources · 473 KB · 0 KB savings available
PASS
39 resources · 473 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 473 KB
Warning::
38 third-party resources (100% of weight)
39 resources · 472.7 KiB · 38 third-party Within 1MB page-weight target
Image 52% · 245.9 KiB
JavaScript 24% · 111.5 KiB
Font 13% · 59.6 KiB
Other 11% · 50.0 KiB
Document 1% · 4.6 KiB
CSS 0% · 1.1 KiB
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
39 requests over 1747ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.5 s LCP 4.7 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 — 34 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 — 39 ms — h2https://www.shell.com/.shelli18n.jsonwww.shell.com/.shelli18n.json https://www.shell.com/.shelli18n.json — 200 — 984 B — 29 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 — 33 ms — h2https://www.shell.com/.model.jsonwww.shell.com/.model.json https://www.shell.com/.model.json — 200 — 4.4 KiB — 34 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 — 20 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 — 38 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 — 31 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 — 23 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 — 22 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 — 38 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=a1493842-4ac3-4f0a-b26d-abfef7ebfef0-tdvanv&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=a1493842-4ac3-4f0a-b26d-abfef7ebfef0-tdvanv&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 — 908 B — 35 ms — h2https://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 — 21 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 — 21 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=1.75&imwidth=301&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=1.75&imwidth=301&impolicy=amidala-image — 200 — 41.7 KiB — 493 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 — 76 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 — 173 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 — 76 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 — 383 B — 74 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 — 75 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=1.75&imwidth=301&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=1.75&imwidth=301&impolicy=amidala-image — 200 — 31.1 KiB — 482 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=1.75&imwidth=301&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=1.75&imwidth=301&impolicy=amidala-image — 200 — 37.5 KiB — 334 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=1.75&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=1.75&imwidth=301&impolicy=amidala-image — 200 — 29.6 KiB — 302 ms — h3https://www.shell.com/_jcr_content/root/main/section/promo_copy_1380626423.shellimg.jpeg/1742207567624/our-climate-target-promo.jpeg?imdensity=1.75&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=1.75&imwidth=301&impolicy=amidala-image — 200 — 27.6 KiB — 328 ms — h3https://www.shell.com/_jcr_content/root/main/section/promo_copy_1790846724.shellimg.jpeg/1724846627915/hero-image-man-woman-in-office.jpeg?imdensity=1.75&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=1.75&imwidth=301&impolicy=amidala-image — 200 — 30.7 KiB — 541 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=1.75&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=1.75&imwidth=301&impolicy=amidala-image — 200 — 38.2 KiB — 407 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 — 0 B — 7 ms — h3https://www.shell.com/content/dam/shell/icons/global/travel/globe-solid.svgwww.shell.com/content/dam/shell/ico... https://www.shell.com/content/dam/shell/icons/global/travel/globe-solid.svg — 200 — 810 B — 44 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.5 s LCP 4.7 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 — 34 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 — 39 ms — h2https://www.shell.com/.shelli18n.jsonwww.shell.com/.shelli18n.json https://www.shell.com/.shelli18n.json — 200 — 984 B — 29 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 — 33 ms — h2https://www.shell.com/.model.jsonwww.shell.com/.model.json https://www.shell.com/.model.json — 200 — 4.4 KiB — 34 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 — 20 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 — 38 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 — 31 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 — 23 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 — 22 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 — 38 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=a1493842-4ac3-4f0a-b26d-abfef7ebfef0-tdvanv&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=a1493842-4ac3-4f0a-b26d-abfef7ebfef0-tdvanv&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 — 908 B — 35 ms — h2https://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 — 21 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... 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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 1699ms · 94KB · £18/mo
www.shell.com
Other
Costly
Execution 771ms
Transfer 42 KB
Monthly Cost £8/mo
Unattributable
Other
Costly
Execution 538ms
Transfer 0 KB
Monthly Cost £6/mo
s.go-mpulse.net
Other
Costly
Execution 258ms
Transfer 48 KB
Monthly Cost £3/mo
www.shell.com
Other
Optional
Execution 131ms
Transfer 4 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.shell.com adds 771ms and costs ~£8/month
  • Unattributable adds 538ms and costs ~£6/month
  • s.go-mpulse.net adds 258ms 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

www.shell.com takes 771ms 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

Unattributable takes 538ms 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

s.go-mpulse.net takes 258ms 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

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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