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https://norwegian.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
2
REVIEW
5
PASS
6
INFO
2

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

Mobile Desktop
77
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

653 ms

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

2.22 s

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

255 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.

1.62 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.

2.28 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 5 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 (1.2 MiB of 1.2 MiB)
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.

B
Page Weight Budget
1.2 MB transferred, 58 requests
REVIEW
1.2 MB transferred, 58 requests
Info::
Page weighs 3.8 MB (1.2 MB transferred)
Warning::
JavaScript is 707 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 707 KB
Info::
Fonts are 203 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 203 KB
Info::
58 HTTP requests
Info::
Estimated 0.25 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
58 requests
0.25 g CO2 per page load
JavaScript 707.3 KiB 57%
Fonts 202.5 KiB 16%
Images 186.6 KiB 15%
CSS 73.5 KiB 6%
Other 52.3 KiB 4%
HTML 9.1 KiB 1%
Other 4.2 KiB 0%
Other 2.7 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under 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

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

B
Image Optimization
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://www.norwegian.com/Content/img/ident.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 187 KB
0 oversized -0 KB
18 legacy format
1 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

C
JS Execution Cost
Action
1141ms total JS execution
REVIEW
1141ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NVL...: 347ms CPU time
Info::
Unattributable: 199ms CPU time
Info::
https://www.norwegian.com/script-bundle/lazysizes....: 152ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202502.1...: 120ms CPU time
Info::
https://www.norwegian.com/: 91ms CPU time
Warning::
Third-party scripts: 1141ms (100% of total)

Main Thread Breakdown

Script Evaluation 58% Other 25% Script Parsing & Compilation 7% Style & Layout 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-NVL4JDR347ms302ms26ms3rd
Unattributable199ms55ms0ms3rd
https://www.norwegian.com/script-bundle/lazysizes.js?v=3HmW99h1vglLXWpaWVnJHw-kycI152ms16ms0ms3rd
https://cdn.cookielaw.org/scripttemplates/202502.1.0/otBannerSdk.js120ms60ms17ms3rd
https://www.norwegian.com/91ms16ms2ms3rd
https://www.norwegian.com/cdn-cgi/challenge-platform/scripts/jsd/main.js87ms84ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-XMQZZ1BMXF&cx=c&gtm=4e64e1&bs=ctrl284ms67ms16ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-5877806&cx=c&gtm=4e64e1&bs=ctrl261ms47ms12ms3rd
C
JS Bundles
Action
12 scripts, 240 KB unused
REVIEW
12 scripts, 240 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-XMQZ...: 66 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-587...: 59 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202502.1...: 59 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NVL...: 56 KB unused (26%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 240 KB
240 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-XMQZZ1BMXF&cx=c&gtm=4e64e1&bs=ctrl2161 KB66 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-5877806&cx=c&gtm=4e64e1&bs=ctrl2131 KB59 KB (45%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202502.1.0/otBannerSdk.js115 KB59 KB (51%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NVL4JDR214 KB56 KB (26%)✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js9 KB—✓3rd
https://www.norwegian.com/script-bundle/lazysizes.js?v=3HmW99h1vglLXWpaWVnJHw-kycI3 KB—✓3rd
https://www.norwegian.com/script-bundle/accessibility-cookie.js?v=dXpbs49Ir3bAAlKNQptp2tiYm3Y0 KB—✓3rd
https://www.norwegian.com/Util/Find/epi-util/find.js2 KB—✓3rd
https://www.norwegian.com/script-bundle/plainPageController.js?v=vXtO0lMnV-65pIzpW8oEWlI7Ty82 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 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

C
Page Weight Inventory
Action
58 resources · 1.2 MB · 240 KB savings available
REVIEW
58 resources · 1.2 MB · 240 KB savings available
Warning::
Page weight 214 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~240 KB of savings available
Warning::
57 third-party resources (100% of weight)
Info::
1 resources over 200KB
58 resources · 1.2 MiB · 57 third-party 214.2 KiB over 1MB target
JavaScript 57% · 707.3 KiB
Font 16% · 202.5 KiB
Image 15% · 188.2 KiB
CSS 6% · 77.9 KiB
Other 4% · 52.3 KiB
Document 1% · 10.1 KiB

~240.2 KiB of savings available

Remove unused JavaScript: 240.2 KiB
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
7 fonts (203 KB)
PASS
7 fonts (203 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

203 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 653 ms LCP 2.2 shttps://www.norwegian.com/Content/webfonts/NorwegianTextPro-Bold.woff2NorwegianTextPro-Bold.w... https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Bold.woff2 — 29.3 KiB — 28 ms — font-display: swaphttps://www.norwegian.com/Content/webfonts/NorwegianTextPro-Regular.woff2NorwegianTextPro-Regula... https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Regular.woff2 — 28.6 KiB — 19 ms — font-display: swaphttps://www.norwegian.com/Content/webfonts/NorwegianDisplayPro-Bold.woff2NorwegianDisplayPro-Bol... https://www.norwegian.com/Content/webfonts/NorwegianDisplayPro-Bold.woff2 — 28.9 KiB — 27 ms — font-display: swaphttps://www.norwegian.com/Content/webfonts/NorwegianDisplayPro-Regular.woff2NorwegianDisplayPro-Reg... https://www.norwegian.com/Content/webfonts/NorwegianDisplayPro-Regular.woff2 — 28.8 KiB — 27 ms — font-display: swaphttps://www.norwegian.com/Content/webfonts/NorwegianTextPro-Regular.woff2?v=2yPPwIqAJFd8grPAhs0-mcvOmVENorwegianTextPro-Regula... https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Regular.woff2?v=2yPPwIqAJFd8grPAhs0-mcvOmVE — 28.6 KiB — 16 ms — font-display: swaphttps://www.norwegian.com/Content/webfonts/NorwegianDisplayPro-Bold.woff2?v=2yPPwIqAJFd8grPAhs0-mcvOmVENorwegianDisplayPro-Bol... https://www.norwegian.com/Content/webfonts/NorwegianDisplayPro-Bold.woff2?v=2yPPwIqAJFd8grPAhs0-mcvOmVE — 29.0 KiB — 21 ms — font-display: swaphttps://www.norwegian.com/Content/webfonts/NorwegianTextPro-Bold.woff2?v=2yPPwIqAJFd8grPAhs0-mcvOmVENorwegianTextPro-Bold.w... https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Bold.woff2?v=2yPPwIqAJFd8grPAhs0-mcvOmVE — 29.4 KiB — 21 ms — font-display: swap
NorwegianTextPro-Bold.w... woff2 swap
Size 29 KB
Load time 28 ms
Start 276 ms
Risk FOUT — text flashes from fallback to web font
NorwegianTextPro-Regula... woff2 swap
Size 29 KB
Load time 19 ms
Start 276 ms
Risk FOUT — text flashes from fallback to web font
NorwegianDisplayPro-Bol... woff2 swap
Size 29 KB
Load time 27 ms
Start 276 ms
Risk FOUT — text flashes from fallback to web font
NorwegianDisplayPro-Reg... woff2 swap
Size 29 KB
Load time 27 ms
Start 277 ms
Risk FOUT — text flashes from fallback to web font
NorwegianTextPro-Regula... woff2 swap
Size 29 KB
Load time 16 ms
Start 366 ms
Risk FOUT — text flashes from fallback to web font
NorwegianDisplayPro-Bol... woff2 swap
Size 29 KB
Load time 21 ms
Start 366 ms
Risk FOUT — text flashes from fallback to web font
NorwegianTextPro-Bold.w... woff2 swap
Size 29 KB
Load time 21 ms
Start 1.4 s
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
58 requests over 2385ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 653 ms LCP 2.2 shttps://norwegian.com// https://norwegian.com/ — 301 — 295 B — 16 ms — h2https://www.norwegian.com/www.norwegian.com/ https://www.norwegian.com/ — 200 — 9.1 KiB — 252 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 24 ms — h2https://www.norwegian.com/style-bundle/cms-brand.css?v=bLHHIb7YsgNRVYXxfbSQhVOIMeIwww.norwegian.com/style-bundle/cms-... https://www.norwegian.com/style-bundle/cms-brand.css?v=bLHHIb7YsgNRVYXxfbSQhVOIMeI — 200 — 73.5 KiB — 21 ms — h2https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Bold.woff2www.norwegian.com/Content/webfonts/... https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Bold.woff2 — 200 — 29.3 KiB — 28 ms — h2https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Regular.woff2www.norwegian.com/Content/webfonts/... https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Regular.woff2 — 200 — 28.6 KiB — 19 ms — h2https://www.norwegian.com/Content/webfonts/NorwegianDisplayPro-Bold.woff2www.norwegian.com/Content/webfonts/... https://www.norwegian.com/Content/webfonts/NorwegianDisplayPro-Bold.woff2 — 200 — 28.9 KiB — 27 ms — h2https://www.norwegian.com/Content/webfonts/NorwegianDisplayPro-Regular.woff2www.norwegian.com/Content/webfonts/... https://www.norwegian.com/Content/webfonts/NorwegianDisplayPro-Regular.woff2 — 200 — 28.8 KiB — 27 ms — h2https://www.norwegian.com/Content/img/ident.svgwww.norwegian.com/Content/img/ident... https://www.norwegian.com/Content/img/ident.svg — 200 — 2.3 KiB — 27 ms — h2https://www.norwegian.com/Content/img/ident-mobile.svgwww.norwegian.com/Content/img/ident... https://www.norwegian.com/Content/img/ident-mobile.svg — 200 — 898 B — 19 ms — h2https://cdn.cookielaw.org/consent/01954228-a71d-776f-8b32-db7d22438f0f/01954228-a71d-776f-8b32-db7d22438f0f.jsoncdn.cookielaw.org/consent/01954228-... https://cdn.cookielaw.org/consent/01954228-a71d-776f-8b32-db7d22438f0f/01954228-a71d-776f-8b32-db7d22438f0f.json — 200 — 2.5 KiB — 28 ms — h2https://www.norwegian.com/script-bundle/lazysizes.js?v=3HmW99h1vglLXWpaWVnJHw-kycIwww.norwegian.com/script-bundle/laz... https://www.norwegian.com/script-bundle/lazysizes.js?v=3HmW99h1vglLXWpaWVnJHw-kycI — 200 — 3.3 KiB — 16 ms — h2https://www.norwegian.com/script-bundle/accessibility-cookie.js?v=dXpbs49Ir3bAAlKNQptp2tiYm3Ywww.norwegian.com/script-bundle/acc... https://www.norwegian.com/script-bundle/accessibility-cookie.js?v=dXpbs49Ir3bAAlKNQptp2tiYm3Y — 200 — 320 B — 19 ms — h2https://www.norwegian.com/Util/Find/epi-util/find.jswww.norwegian.com/Util/Find/epi-uti... https://www.norwegian.com/Util/Find/epi-util/find.js — 200 — 2.4 KiB — 23 ms — h2https://www.norwegian.com/script-bundle/plainPageController.js?v=vXtO0lMnV-65pIzpW8oEWlI7Ty8www.norwegian.com/script-bundle/pla... https://www.norwegian.com/script-bundle/plainPageController.js?v=vXtO0lMnV-65pIzpW8oEWlI7Ty8 — 200 — 2.3 KiB — 21 ms — h2https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 27 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-NVL4JDRwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-NVL4JDR — 200 — 214.2 KiB — 46 ms — h2https://js.monitor.azure.com/scripts/b/ai.2.gbl.min.jsjs.monitor.azure.com/scripts/b/ai.2... https://js.monitor.azure.com/scripts/b/ai.2.gbl.min.js — 200 — 46.2 KiB — 44 ms — h2https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Regular.woff2?v=2yPPwIqAJFd8grPAhs0-mcvOmVEwww.norwegian.com/Content/webfonts/... https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Regular.woff2?v=2yPPwIqAJFd8grPAhs0-mcvOmVE — 200 — 28.6 KiB — 16 ms — h2https://www.norwegian.com/Content/webfonts/NorwegianDisplayPro-Bold.woff2?v=2yPPwIqAJFd8grPAhs0-mcvOmVEwww.norwegian.com/Content/webfonts/... https://www.norwegian.com/Content/webfonts/NorwegianDisplayPro-Bold.woff2?v=2yPPwIqAJFd8grPAhs0-mcvOmVE — 200 — 29.0 KiB — 21 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 300 B — 43 ms — h2https://www.norwegian.com/cdn-cgi/challenge-platform/scripts/jsd/main.jswww.norwegian.com/cdn-cgi/challenge... https://www.norwegian.com/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 371 B — 18 ms — h2https://www.norwegian.com/cdn-cgi/challenge-platform/h/g/scripts/jsd/b0a7532ac8ec/main.js?www.norwegian.com/cdn-cgi/challenge... https://www.norwegian.com/cdn-cgi/challenge-platform/h/g/scripts/jsd/b0a7532ac8ec/main.js? — 200 — 12.4 KiB — 10 ms — h2https://www.norwegian.com/Images/countries-flags/dk.svgwww.norwegian.com/Images/countries-... https://www.norwegian.com/Images/countries-flags/dk.svg — 200 — 4.4 KiB — 18 ms — h2https://www.norwegian.com/Images/countries-flags/de.svgwww.norwegian.com/Images/countries-... https://www.norwegian.com/Images/countries-flags/de.svg — 200 — 4.5 KiB — 19 ms — h2https://www.norwegian.com/Images/countries-flags/es.svgwww.norwegian.com/Images/countries-... https://www.norwegian.com/Images/countries-flags/es.svg — 200 — 48.8 KiB — 37 ms — h2https://www.norwegian.com/Images/countries-flags/fi.svgwww.norwegian.com/Images/countries-... https://www.norwegian.com/Images/countries-flags/fi.svg — 200 — 5.9 KiB — 23 ms — h2https://www.norwegian.com/Images/countries-flags/fr.svgwww.norwegian.com/Images/countries-... https://www.norwegian.com/Images/countries-flags/fr.svg — 200 — 4.5 KiB — 14 ms — h2https://www.norwegian.com/Images/countries-flags/nl.svgwww.norwegian.com/Images/countries-... https://www.norwegian.com/Images/countries-flags/nl.svg — 200 — 4.5 KiB — 27 ms — h2https://www.norwegian.com/Images/countries-flags/no.svgwww.norwegian.com/Images/countries-... https://www.norwegian.com/Images/countries-flags/no.svg — 200 — 5.4 KiB — 28 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 653 ms LCP 2.2 shttps://norwegian.com// https://norwegian.com/ — 301 — 295 B — 16 ms — h2https://www.norwegian.com/www.norwegian.com/ https://www.norwegian.com/ — 200 — 9.1 KiB — 252 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 24 ms — h2https://www.norwegian.com/style-bundle/cms-brand.css?v=bLHHIb7YsgNRVYXxfbSQhVOIMeIwww.norwegian.com/style-bundle/cms-... https://www.norwegian.com/style-bundle/cms-brand.css?v=bLHHIb7YsgNRVYXxfbSQhVOIMeI — 200 — 73.5 KiB — 21 ms — h2https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Bold.woff2www.norwegian.com/Content/webfonts/... https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Bold.woff2 — 200 — 29.3 KiB — 28 ms — h2https://www.norwegian.com/Content/webfonts/NorwegianTextPro-Regular.woff2www.norwegian.com/Content/webfonts/... 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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 1141ms · 633KB · $15/mo
Google Tag Manager
Tag Manager
Costly
Execution 347ms
Transfer 214 KB
Unused 26%
Monthly Cost $5/mo
Unattributable
Other
Optional
Execution 199ms
Transfer 0 KB
Monthly Cost $3/mo
www.norwegian.com
Other
Optional
Execution 152ms
Transfer 3 KB
Monthly Cost $2/mo
OneTrust
Consent
Essential
Execution 120ms
Transfer 115 KB
Unused 51%
Monthly Cost $2/mo
www.norwegian.com
Other
Optional
Execution 91ms
Transfer 9 KB
Monthly Cost $1/mo
www.norwegian.com
Other
Optional
Execution 87ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 84ms
Transfer 161 KB
Unused 41%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 131 KB
Unused 45%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 347ms and costs ~$5/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

Google Tag Manager takes 347ms 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

51% of OneTrust'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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