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https://www.adyen.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
85
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.
92
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.

1.02 s

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

1.83 s

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

135 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.

1.97 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.

2.63 s

Page Load Progression

568 ms
1.1 s
1.7 s
2.3 s
2.8 s
3.4 s
4.0 s
4.5 s
Checks
14
5 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
5.1 MB transferred, 70 requests
FIX
5.1 MB transferred, 70 requests
Critical::
Page weighs 9.7 MB (5.1 MB transferred)
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
70 HTTP requests
Info::
Estimated 1.1 g CO2 per page load
5.1 MB / 2.4 MB budget
5.1 MB transferred
70 requests
1.1 g CO2 per page load
Other 3.2 MiB 63%
JavaScript 1.0 MiB 20%
Images 293.5 KiB 6%
Other 192.1 KiB 4%
HTML 188.1 KiB 4%
Fonts 179.0 KiB 3%
CSS 45.5 KiB 1%
Other 4.2 KiB 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
Third-Party Impact
Action
81% third-party, 0 ms blocking
FIX
81% third-party, 0 ms blocking
Warning::
Third-party code accounts for 81% of page weight (4.1 MiB of 5.1 MiB)
Info::
Third-party blocking time is low (0 ms)
19%
81%
First-party Third-party
D
JS Execution Cost
Action
2125ms total JS execution
FIX
2125ms total JS execution
Warning::
https://www.adyen.com/main_nuxt/B63nptKw.js: 753ms CPU time
Warning::
Unattributable: 366ms CPU time
Warning::
https://www.adyen.com/: 342ms CPU time
Warning::
https://www.adyen.com/main_nuxt/BqNvtlgv.js: 300ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-575...: 129ms CPU time
Info::
Third-party scripts: 730ms (34% of total)

Main Thread Breakdown

Script Evaluation 52% Other 27% Style & Layout 11% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://www.adyen.com/main_nuxt/B63nptKw.js753ms633ms0ms1st
Unattributable366ms79ms0ms3rd
https://www.adyen.com/342ms65ms1ms1st
https://www.adyen.com/main_nuxt/BqNvtlgv.js300ms41ms1ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-575TF4H&gtm_auth=afdbAXrh3-yNk9m3Wq79uw&gtm_preview=env-1129ms88ms19ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T4QN7PF3&gtm=4e6460125ms87ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=G-TRCPE14CWT&cx=c&gtm=4e6460109ms95ms13ms3rd
D
JS Bundles
Action
22 scripts, 398 KB unused
FIX
22 scripts, 398 KB unused
Warning::
https://www.adyen.com/main_nuxt/BqNvtlgv.js: 106 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T4Q...: 73 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-TRCP...: 67 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 65 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-575...: 64 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 398 KB
398 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.adyen.com/main_nuxt/BqNvtlgv.js187 KB106 KB (57%)✓1st
https://www.googletagmanager.com/gtm.js?id=GTM-T4QN7PF3&gtm=4e6460179 KB73 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-TRCPE14CWT&cx=c&gtm=4e6460176 KB67 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=DC-9189202&cx=c&gtm=4e6460129 KB65 KB (50%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-575TF4H&gtm_auth=afdbAXrh3-yNk9m3Wq79uw&gtm_preview=env-1175 KB64 KB (37%)✓3rd
https://www.adyen.com/main_nuxt/B63nptKw.js60 KB23 KB (39%)✓1st
https://www.adyen.com/main_nuxt/DcFaDOcT.js0 KB—✓1st
https://www.adyen.com/main_nuxt/DWcExtbm.js24 KB—✓1st
https://www.adyen.com/main_nuxt/VZ5Amcfz.js0 KB—✓1st
https://www.adyen.com/main_nuxt/CqSjXCce.js23 KB—✓1st

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

B
Image Optimization
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
Info::
All images are well-optimized
29 images 294 KB
0 oversized -0 KB
23 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public,max-age=0,must-revalidate
REVIEW
public,max-age=0,must-revalidate
Info::
Cache-Control header is set
Got: public,max-age=0,must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

public,max-age=0,must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
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
2 fonts (179 KB)
PASS
2 fonts (179 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

179 KB total

Render-blocking

0

of 2

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 FCP 1.0 s LCP 1.8 shttps://www.adyen.com/main_nuxt/Adyen-Mono-Variable.BG3e1ATU.woff2Adyen-Mono-Variable.BG3... https://www.adyen.com/main_nuxt/Adyen-Mono-Variable.BG3e1ATU.woff2 — 33.7 KiB — 0 ms — font-display: swaphttps://www.adyen.com/main_nuxt/Adyen-Variable.s-8vvc6Q.woff2Adyen-Variable.s-8vvc6Q... https://www.adyen.com/main_nuxt/Adyen-Variable.s-8vvc6Q.woff2 — 145.3 KiB — 0 ms — font-display: swap
Adyen-Mono-Variable.BG3... woff2 swap
Size 34 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Adyen-Variable.s-8vvc6Q... woff2 swap
Size 145 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)

Fixing the unchecked items could save ~73 KB and ~146 ms

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
70 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
34% of JavaScript execution is third-party
First-party Third-party 730ms · 530KB · €12/mo
Unattributable
Other
Costly
Execution 366ms
Transfer 0 KB
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Optional
Execution 129ms
Transfer 175 KB
Unused 37%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 125ms
Transfer 179 KB
Unused 41%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 109ms
Transfer 176 KB
Unused 38%
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • Unattributable adds 366ms and costs ~€6/month

Unattributable takes 366ms 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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