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https://klarna.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
34
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

6.18 s

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

11.79 s

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

1.55 s

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.

6.18 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.

18.46 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
8 PASS 1 REVIEW 6 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 88 requests
FIX
2.4 MB transferred, 88 requests
Info::
Page weighs 7.2 MB (2.4 MB transferred)
Warning::
JavaScript is 1.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.9 MB
Info::
88 HTTP requests
Info::
Estimated 0.51 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
88 requests
0.51 g CO2 per page load
JavaScript 1.9 MiB 78%
Fonts 189.6 KiB 8%
Images 173.6 KiB 7%
HTML 130.7 KiB 5%
CSS 14.4 KiB 1%
Other 10.3 KiB 0%
Other 8.0 KiB 0%
Other 7.3 KiB 0%
Other 812 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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
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 (2.4 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5517ms total JS execution
FIX
5517ms total JS execution
Warning::
https://owp.klarna.com/static/framework-07d90868.j...: 1652ms CPU time
Warning::
https://www.klarna.com/fr/?grs=%2F&grr=https%3A%2F...: 834ms CPU time
Warning::
https://38b12937d261.08d5593f.eu-west-1.token.awsw...: 827ms CPU time
Warning::
Unattributable: 782ms CPU time
Warning::
https://owp.klarna.com/38b12937d261/1be2c35156de/c...: 778ms CPU time
Warning::
Third-party scripts: 5517ms (100% of total)

Main Thread Breakdown

Script Evaluation 61% Other 17% Script Parsing & Compilation 10% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://owp.klarna.com/static/framework-07d90868.js1652ms1577ms22ms3rd
https://www.klarna.com/fr/?grs=%2F&grr=https%3A%2F%2Fwww.klarna.com%2F834ms93ms4ms3rd
https://38b12937d261.08d5593f.eu-west-1.token.awswaf.com/38b12937d261/1be2c35156de/2f5cb8c93ee7/challenge.js827ms560ms121ms3rd
Unattributable782ms145ms0ms3rd
https://owp.klarna.com/38b12937d261/1be2c35156de/challenge.js778ms641ms106ms3rd
https://owp.klarna.com/static/main-895cb1e6.js255ms193ms55ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W597GXV211ms150ms44ms3rd
https://edge.fullstory.com/s/fs.js106ms74ms22ms3rd
https://owp.klarna.com/static/58375-7a68007e.js72ms1ms70ms3rd
F
JS Bundles
Action
35 scripts, 1013 KB unused
FIX
35 scripts, 1013 KB unused
Warning::
https://owp.klarna.com/38b12937d261/1be2c35156de/c...: 296 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://38b12937d261.08d5593f.eu-west-1.token.awsw...: 280 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://owp.klarna.com/static/58375-7a68007e.js: 120 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W59...: 82 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://owp.klarna.com/static/main-895cb1e6.js: 62 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1013 KB
1013 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://owp.klarna.com/38b12937d261/1be2c35156de/challenge.js501 KB296 KB (59%)✓3rd
https://38b12937d261.08d5593f.eu-west-1.token.awswaf.com/38b12937d261/1be2c35156de/2f5cb8c93ee7/challenge.js501 KB280 KB (56%)✓3rd
https://owp.klarna.com/static/58375-7a68007e.js156 KB120 KB (77%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W597GXV163 KB82 KB (50%)✓3rd
https://owp.klarna.com/static/main-895cb1e6.js133 KB62 KB (47%)✓3rd
https://edge.fullstory.com/s/fs.js80 KB53 KB (67%)✓3rd
https://owp.klarna.com/static/commons-b4b6251b.js82 KB52 KB (64%)✓3rd
https://owp.klarna.com/static/65266-266345e4.js87 KB45 KB (52%)✓3rd
https://owp.klarna.com/static/98116-2f180f0d.js38 KB23 KB (61%)✓3rd
https://owp.klarna.com/static/36023-97009f61.js8 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

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

F
Page Weight Inventory
Action
88 resources · 2.4 MB · 1013 KB savings available
FIX
88 resources · 2.4 MB · 1013 KB savings available
Warning::
Page weight 1.4 MB over 1MB target
Got: 2.4 MB Expected: ≤ 1 MB
Info::
~1013 KB of savings available
Warning::
87 third-party resources (100% of weight)
Info::
2 resources over 200KB
88 resources · 2.4 MiB · 87 third-party 1.4 MiB over 1MB target
JavaScript 78% · 1.9 MiB
Font 8% · 189.6 KiB
Image 7% · 181.2 KiB
Document 5% · 133.8 KiB
Other 1% · 15.5 KiB
CSS 1% · 14.4 KiB

~1013.1 KiB of savings available

Remove unused JavaScript: 1013.1 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
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
Image Optimization
19 images, 0 KB saveable
PASS
19 images, 0 KB saveable
Warning::
https://images.ctfassets.net/31h9ykss8g0q/2uYooyxZ... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/31h9ykss8g0q/39AdylLc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 174 KB
0 oversized -0 KB
0 legacy format
2 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

A+
Font Loading
7 fonts (190 KB)
PASS
7 fonts (190 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

190 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.2 s LCP 11.8 shttps://x.klarnacdn.net/ui/fonts/v1.5/KlarnaTitle-Bold.woff2KlarnaTitle-Bold.woff2 https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaTitle-Bold.woff2 — 27.2 KiB — 144 ms — font-display: swaphttps://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Regular.woff2KlarnaText-Regular.woff2 https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Regular.woff2 — 25.6 KiB — 128 ms — font-display: swaphttps://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Italic.woff2KlarnaText-Italic.woff2 https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Italic.woff2 — 27.0 KiB — 148 ms — font-display: swaphttps://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Medium.woff2KlarnaText-Medium.woff2 https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Medium.woff2 — 26.2 KiB — 148 ms — font-display: swaphttps://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-MediumItalic.woff2KlarnaText-MediumItalic... https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-MediumItalic.woff2 — 27.6 KiB — 148 ms — font-display: swaphttps://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Bold.woff2KlarnaText-Bold.woff2 https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Bold.woff2 — 26.2 KiB — 148 ms — font-display: swaphttps://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-BoldItalic.woff2KlarnaText-BoldItalic.w... https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-BoldItalic.woff2 — 29.9 KiB — 148 ms — font-display: swap
KlarnaTitle-Bold.woff2 woff2 swap
Size 27 KB
Load time 144 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KlarnaText-Regular.woff2 woff2 swap
Size 26 KB
Load time 128 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KlarnaText-Italic.woff2 woff2 swap
Size 27 KB
Load time 148 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KlarnaText-Medium.woff2 woff2 swap
Size 26 KB
Load time 148 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KlarnaText-MediumItalic... woff2 swap
Size 28 KB
Load time 148 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KlarnaText-Bold.woff2 woff2 swap
Size 26 KB
Load time 148 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KlarnaText-BoldItalic.w... woff2 swap
Size 30 KB
Load time 148 ms
Start 1.6 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+
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
88 requests over 4187ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.2 s LCP 11.8 shttps://klarna.com// https://klarna.com/ — 301 — 267 B — 13 ms — h2https://www.klarna.com/www.klarna.com/ https://www.klarna.com/ — 202 — 2.9 KiB — 20 ms — h2https://38b12937d261.08d5593f.eu-west-1.token.awswaf.com/38b12937d261/1be2c35156de/2f5cb8c93ee7/challenge.js38b12937d261.08d5593f.eu-west-1.tok... https://38b12937d261.08d5593f.eu-west-1.token.awswaf.com/38b12937d261/1be2c35156de/2f5cb8c93ee7/challenge.js — 200 — 501.1 KiB — 368 ms — h2https://38b12937d261.08d5593f.eu-west-1.token.awswaf.com/38b12937d261/1be2c35156de/2f5cb8c93ee7/inputs?client=browser38b12937d261.08d5593f.eu-west-1.tok... https://38b12937d261.08d5593f.eu-west-1.token.awswaf.com/38b12937d261/1be2c35156de/2f5cb8c93ee7/inputs?client=browser — 200 — 829 B — 67 ms — h3https://www.klarna.com/favicon.icowww.klarna.com/favicon.ico https://www.klarna.com/favicon.ico — 202 — 537 B — 6 ms — h2https://38b12937d261.08d5593f.eu-west-1.token.awswaf.com/38b12937d261/1be2c35156de/2f5cb8c93ee7/mp_verify38b12937d261.08d5593f.eu-west-1.tok... https://38b12937d261.08d5593f.eu-west-1.token.awswaf.com/38b12937d261/1be2c35156de/2f5cb8c93ee7/mp_verify — 200 — 630 B — 95 ms — h3https://38b12937d261.08d5593f.eu-west-1.token.awswaf.com/38b12937d261/1be2c35156de/2f5cb8c93ee7/mp_verify38b12937d261.08d5593f.eu-west-1.tok... https://38b12937d261.08d5593f.eu-west-1.token.awswaf.com/38b12937d261/1be2c35156de/2f5cb8c93ee7/mp_verify — 200 — 630 B — 224 ms — h3https://www.klarna.com/www.klarna.com/ https://www.klarna.com/ — 307 — 1.9 KiB — 437 ms — h3https://www.klarna.com/fr/?grs=%2F&grr=https%3A%2F%2Fwww.klarna.com%2Fwww.klarna.com/fr/?grs=%2F&grr=http... https://www.klarna.com/fr/?grs=%2F&grr=https%3A%2F%2Fwww.klarna.com%2F — 200 — 124.7 KiB — 201 ms — h3https://images.ctfassets.net/31h9ykss8g0q/52k00xqSt6mC3kz8vib7tc/6e361267992839db8290bc7ad2f320f9/Hero_New_mobile_-_FR.png?w=2000&q=80&fm=avifimages.ctfassets.net/31h9ykss8g0q/5... https://images.ctfassets.net/31h9ykss8g0q/52k00xqSt6mC3kz8vib7tc/6e361267992839db8290bc7ad2f320f9/Hero_New_mobile_-_FR.png?w=2000&q=80&fm=avif — 200 — 85.7 KiB — 172 ms — h2https://owp.klarna.com/static/features-klarnaMarketing-slots-klarnaFooter-KlarnaFooterOnVisible-520d3864.cssowp.klarna.com/static/features-klar... https://owp.klarna.com/static/features-klarnaMarketing-slots-klarnaFooter-KlarnaFooterOnVisible-520d3864.css — 200 — 780 B — 62 ms — h2https://owp.klarna.com/static/components-searchAndCompare-SearchAndCompare-35a7fb23.cssowp.klarna.com/static/components-se... https://owp.klarna.com/static/components-searchAndCompare-SearchAndCompare-35a7fb23.css — 200 — 1.3 KiB — 59 ms — h2https://owp.klarna.com/static/components-featuredStoreGrid-FeaturedStoreGrid-f65d23b5.cssowp.klarna.com/static/components-fe... https://owp.klarna.com/static/components-featuredStoreGrid-FeaturedStoreGrid-f65d23b5.css — 200 — 1.4 KiB — 62 ms — h2https://owp.klarna.com/static/components-homeContentSlider-HomeContentSlider-24358618.cssowp.klarna.com/static/components-ho... https://owp.klarna.com/static/components-homeContentSlider-HomeContentSlider-24358618.css — 200 — 1.1 KiB — 69 ms — h2https://owp.klarna.com/static/components-paymentMethods-PaymentMethods-82442bc7.cssowp.klarna.com/static/components-pa... https://owp.klarna.com/static/components-paymentMethods-PaymentMethods-82442bc7.css — 200 — 1.3 KiB — 63 ms — h2https://owp.klarna.com/static/features-home-routes-KlarnaHome-KlarnaHome-387dd184.cssowp.klarna.com/static/features-home... https://owp.klarna.com/static/features-home-routes-KlarnaHome-KlarnaHome-387dd184.css — 200 — 3.1 KiB — 65 ms — h2https://owp.klarna.com/static/apps-klarna-Layout-f510adde.cssowp.klarna.com/static/apps-klarna-L... https://owp.klarna.com/static/apps-klarna-Layout-f510adde.css — 200 — 892 B — 71 ms — h2https://owp.klarna.com/static/58375-e771d97d.cssowp.klarna.com/static/58375-e771d97... https://owp.klarna.com/static/58375-e771d97d.css — 200 — 4.7 KiB — 74 ms — h2https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaTitle-Bold.woff2x.klarnacdn.net/ui/fonts/v1.5/Klarn... https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaTitle-Bold.woff2 — 200 — 27.2 KiB — 144 ms — h3https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Regular.woff2x.klarnacdn.net/ui/fonts/v1.5/Klarn... https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Regular.woff2 — 200 — 25.6 KiB — 128 ms — h3https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Italic.woff2x.klarnacdn.net/ui/fonts/v1.5/Klarn... https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Italic.woff2 — 200 — 27.0 KiB — 148 ms — h3https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Medium.woff2x.klarnacdn.net/ui/fonts/v1.5/Klarn... https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Medium.woff2 — 200 — 26.2 KiB — 148 ms — h3https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-MediumItalic.woff2x.klarnacdn.net/ui/fonts/v1.5/Klarn... https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-MediumItalic.woff2 — 200 — 27.6 KiB — 148 ms — h3https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Bold.woff2x.klarnacdn.net/ui/fonts/v1.5/Klarn... https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-Bold.woff2 — 200 — 26.2 KiB — 148 ms — h3https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-BoldItalic.woff2x.klarnacdn.net/ui/fonts/v1.5/Klarn... https://x.klarnacdn.net/ui/fonts/v1.5/KlarnaText-BoldItalic.woff2 — 200 — 29.9 KiB — 148 ms — h3https://images.ctfassets.net/31h9ykss8g0q/ok77FpnFWu7DxmhiRhhwU/8de0cf4db0b31fbcb34322e364c775ce/CheckoutFR.png?w=1120&q=80&fm=avifimages.ctfassets.net/31h9ykss8g0q/o... 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h2https://images.ctfassets.net/31h9ykss8g0q/398YQZYh1RLvwP18HN9Luk/d2b4984fd8cbbbb4558319c3e60b2508/FlexiblePayments.png?w=588&q=80&fm=avifimages.ctfassets.net/31h9ykss8g0q/3... https://images.ctfassets.net/31h9ykss8g0q/398YQZYh1RLvwP18HN9Luk/d2b4984fd8cbbbb4558319c3e60b2508/FlexiblePayments.png?w=588&q=80&fm=avif — 200 — 5.8 KiB — 6 ms — h2https://images.ctfassets.net/31h9ykss8g0q/619maPtfOUCoZsyGyaNqxq/9d439932da1be66558620b223585b5c2/NofeesFR.png?w=588&q=80&fm=avifimages.ctfassets.net/31h9ykss8g0q/6... https://images.ctfassets.net/31h9ykss8g0q/619maPtfOUCoZsyGyaNqxq/9d439932da1be66558620b223585b5c2/NofeesFR.png?w=588&q=80&fm=avif — 200 — 7.6 KiB — 6 ms — h2https://widget.trustpilot.com/trustboxes/53aa8807dec7e10d38f59f32/index.html?businessunitId=5d2f47f86653d10001fec55b&templateId=53aa8807dec7e10d38f59f32widget.trustpilot.com/trustboxes/53... 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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 5517ms · 1714KB · $73/mo
owp.klarna.com
Other
Costly
Execution 1652ms
Transfer 56 KB
Monthly Cost $22/mo
www.klarna.com
Other
Costly
Execution 834ms
Transfer 125 KB
Monthly Cost $11/mo
38b12937d261.08d5593f.eu-west-1.token.awswaf.com
Other
Costly
Execution 827ms
Transfer 501 KB
Unused 56%
Monthly Cost $11/mo
Unattributable
Other
Costly
Execution 782ms
Transfer 0 KB
Monthly Cost $10/mo
owp.klarna.com
Other
Costly
Execution 778ms
Transfer 501 KB
Unused 59%
Monthly Cost $10/mo
owp.klarna.com
Other
Costly
Execution 255ms
Transfer 133 KB
Unused 47%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 211ms
Transfer 163 KB
Unused 50%
Monthly Cost $3/mo
edge.fullstory.com
Other
Optional
Execution 106ms
Transfer 80 KB
Unused 67%
Monthly Cost $1/mo
owp.klarna.com
Other
Optional
Execution 72ms
Transfer 156 KB
Unused 77%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • owp.klarna.com adds 1652ms and costs ~$22/month
  • www.klarna.com adds 834ms and costs ~$11/month
  • 38b12937d261.08d5593f.eu-west-1.token.awswaf.com adds 827ms and costs ~$11/month
  • Unattributable adds 782ms and costs ~$10/month
  • owp.klarna.com adds 778ms and costs ~$10/month
  • owp.klarna.com adds 255ms and costs ~$3/month
  • Google Tag Manager adds 211ms 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

owp.klarna.com takes 1652ms 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

www.klarna.com takes 834ms 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

38b12937d261.08d5593f.eu-west-1.token.awswaf.com takes 827ms 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

56% of 38b12937d261.08d5593f.eu-west-1.token.awswaf.com'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

Unattributable takes 782ms 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

owp.klarna.com takes 778ms 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

59% of owp.klarna.com'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

owp.klarna.com takes 255ms 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

Google Tag Manager takes 211ms 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

50% 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

67% of edge.fullstory.com'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

77% of owp.klarna.com'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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