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https://www.maersk.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
2
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
89
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.
88
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

522 ms

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

1.01 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.

0.017

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

6.51 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.

1.01 s

Page Load Progression

1.4 s
2.8 s
4.1 s
5.5 s
6.9 s
8.3 s
9.7 s
11.0 s
Checks
14
6 PASS 4 REVIEW 2 FIX
F
Page Weight Budget
Action
7.3 MB transferred, 81 requests
FIX
7.3 MB transferred, 81 requests
Critical::
Page weighs 12.3 MB (7.3 MB transferred)
Warning::
JavaScript is 534 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 534 KB
Info::
81 HTTP requests
Info::
Estimated 1.5 g CO2 per page load
7.3 MB / 2.4 MB budget
7.3 MB transferred
81 requests
1.5 g CO2 per page load
Other 6.5 MiB 89%
JavaScript 533.9 KiB 7%
Images 140.4 KiB 2%
CSS 106.2 KiB 1%
HTML 26.9 KiB 0%
Fonts 26.5 KiB 0%
Other 8.0 KiB 0%
Other 7.6 KiB 0%
Other 4.9 KiB 0%
Other 451 B 0%
Other 376 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: max-age=0, no-cache, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, no-cache, no-store

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
no-store—Never cache this response
C
Image Optimization
Action
36 images, 0 KB saveable
REVIEW
36 images, 0 KB saveable
Warning::
https://www.maersk.com/content/media/ign/icons/foo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.maersk.com/content/media/ign/icons/foo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.maersk.com/content/media/ign/icons/foo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.maersk.com/content/media/ign/icons/foo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.maersk.com/content/media/ign/icons/foo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
36 images 140 KB
0 oversized -0 KB
24 legacy format
5 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

B
JS Execution Cost
937ms total JS execution
REVIEW
937ms total JS execution
Warning::
Unattributable: 274ms CPU time
Info::
https://www.maersk.com/: 178ms CPU time
Info::
https://www.maersk.com/31BUw3CMS62TMjGsKGfh/GE9iL0...: 148ms CPU time
Info::
https://assets.maerskline.com/mop/rum/latest/mop-r...: 107ms CPU time
Info::
https://assets.maerskline.com/integrated-global-na...: 92ms CPU time
Warning::
Third-party scripts: 541ms (58% of total)

Main Thread Breakdown

Script Evaluation 39% Other 34% Style & Layout 13% Script Parsing & Compilation 6% Parse HTML & CSS 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable274ms5ms0ms3rd
https://www.maersk.com/178ms26ms1ms1st
https://www.maersk.com/31BUw3CMS62TMjGsKGfh/GE9iL0rOEhau8S/CRtoImUcAQ/aQpmaSY/2FS4B148ms104ms5ms1st
https://assets.maerskline.com/mop/rum/latest/mop-rum.js107ms78ms7ms3rd
https://assets.maerskline.com/integrated-global-nav/3/3.4.22-2026.0306.104242/ign.maeu.3.4.22-2026.0306.104242.js92ms46ms9ms3rd
https://www.maersk.com/Assets_sc9/Maersk/scripts/main.js?v=1.0.9561.33888.3070ms45ms8ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-TMZZL49K67ms50ms12ms3rd
C
JS Bundles
Action
13 scripts, 181 KB unused
REVIEW
13 scripts, 181 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TMZ...: 75 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.maersk.com/Assets_sc9/Maersk/scripts/m...: 70 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.maerskline.com/integrated-global-na...: 36 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 181 KB
181 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-TMZZL49K162 KB75 KB (47%)✓3rd
https://www.maersk.com/Assets_sc9/Maersk/scripts/main.js?v=1.0.9561.33888.3088 KB70 KB (80%)✓1st
https://assets.maerskline.com/integrated-global-nav/3/3.4.22-2026.0306.104242/ign.maeu.3.4.22-2026.0306.104242.js89 KB36 KB (40%)✓3rd
https://assets.maerskline.com/integrated-global-nav/2/loader.js0 KB—✓3rd
https://www.maersk.com/akam/13/2f77f8c30 KB—✓1st
https://www.maersk.com/31BUw3CMS62TMjGsKGfh/GE9iL0rOEhau8S/CRtoImUcAQ/aQpmaSY/2FS4B82 KB—✓1st
https://assets.maerskline.com/scp/visitor-min.js1 KB—✓3rd
https://assets.maerskline.com/mop/rum/latest/mop-rum.js67 KB—✓3rd
https://www.maersk.com/~/media_sc9/project/maersk/scripts/chatbot-widget-prod.js3 KB—✓1st
https://service.force.com/embeddedservice/5.0/esw.min.js9 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
6% third-party, 0 ms blocking
PASS
6% third-party, 0 ms blocking
Info::
Third-party code accounts for 6% of page weight (419.3 KiB of 7.3 MiB)
Info::
Third-party blocking time is low (0 ms)
94%
First-party Third-party
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
6 fonts (26 KB)
PASS
6 fonts (26 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

26 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 522 ms LCP 1.0 shttps://assets.maerskline.com/mds/fonts/headline/MaerskHeadline-Light.woff2MaerskHeadline-Light.woff2 https://assets.maerskline.com/mds/fonts/headline/MaerskHeadline-Light.woff2 — 0 B — 0 ms — font-display: swaphttps://assets.maerskline.com/mds/fonts/text/MaerskText-Regular.woff2MaerskText-Regular.woff2 https://assets.maerskline.com/mds/fonts/text/MaerskText-Regular.woff2 — 0 B — 0 ms — font-display: swaphttps://assets.maerskline.com/mds/fonts/headline/MaerskHeadline-Regular.woff2MaerskHeadline-Regular.... https://assets.maerskline.com/mds/fonts/headline/MaerskHeadline-Regular.woff2 — 0 B — 0 ms — font-display: swaphttps://assets.maerskline.com/mds/fonts/text/MaerskText-Light.woff2MaerskText-Light.woff2 https://assets.maerskline.com/mds/fonts/text/MaerskText-Light.woff2 — 26.5 KiB — 0 ms — font-display: swaphttps://assets.maerskline.com/mds/fonts/text/MaerskText-Medium.woff2MaerskText-Medium.woff2 https://assets.maerskline.com/mds/fonts/text/MaerskText-Medium.woff2 — 0 B — 0 ms — font-display: swaphttps://assets.maerskline.com/mds/fonts/text/MaerskText-Bold.woff2MaerskText-Bold.woff2 https://assets.maerskline.com/mds/fonts/text/MaerskText-Bold.woff2 — 0 B — 0 ms — font-display: swap
MaerskHeadline-Light.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MaerskText-Regular.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MaerskHeadline-Regular.... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MaerskText-Light.woff2 woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MaerskText-Medium.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MaerskText-Bold.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 0 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
81 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
58% of JavaScript execution is third-party
First-party Third-party 541ms · 319KB · €3/mo
Unattributable
Other
Costly
Execution 274ms
Transfer 0 KB
Monthly Cost €1/mo
assets.maerskline.com
Other
Optional
Execution 107ms
Transfer 67 KB
Monthly Cost €1/mo
assets.maerskline.com
Other
Optional
Execution 92ms
Transfer 89 KB
Unused 40%
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 67ms
Transfer 162 KB
Unused 47%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 274ms and costs ~€1/month

58% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 274ms 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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