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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
1
PASS
7
INFO
2

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

Mobile Desktop
45
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

1.16 s

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

2.67 s

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

1.12 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.

3.98 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.

7.77 s

Page Load Progression

3.2 s
6.5 s
9.7 s
12.9 s
16.1 s
19.4 s
22.6 s
25.8 s
Checks
14
7 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
5.3 MB transferred, 184 requests
FIX
5.3 MB transferred, 184 requests
Critical::
Page weighs 13.8 MB (5.3 MB transferred)
Warning::
JavaScript is 2.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.3 MB
Info::
CSS is 206 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 206 KB
Warning::
184 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.3 MB / 2.4 MB budget
5.3 MB transferred
184 requests
1.1 g CO2 per page load
JavaScript 2.3 MiB 43%
Other 1.6 MiB 29%
Images 957.7 KiB 18%
CSS 205.5 KiB 4%
HTML 135.3 KiB 2%
Other 93.1 KiB 2%
Fonts 91.0 KiB 2%
Other 26.2 KiB 0%
Other 13.3 KiB 0%
Other 936 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (5.3 MiB of 5.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
8175ms total JS execution
FIX
8175ms total JS execution
Warning::
https://wise.com/static-assets/app/_next/static/ch...: 2040ms CPU time
Warning::
https://wise.com/static-assets/app/_next/static/ch...: 2007ms CPU time
Warning::
https://wise.com/: 1651ms CPU time
Warning::
Unattributable: 598ms CPU time
Warning::
https://wise.com/static-assets/app/_next/static/ch...: 570ms CPU time
Warning::
Third-party scripts: 8175ms (100% of total)

Main Thread Breakdown

Script Evaluation 34% Other 25% Style & Layout 25% Rendering 11% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://wise.com/static-assets/app/_next/static/chunks/framework-e3f3cb15367a2851.js2040ms1122ms5ms3rd
https://wise.com/static-assets/app/_next/static/chunks/4622-ac38ecd0246fe605.js2007ms241ms1ms3rd
https://wise.com/1651ms11ms0ms3rd
Unattributable598ms60ms0ms3rd
https://wise.com/static-assets/app/_next/static/chunks/pages/_app-ceca420c74a4fdae.js570ms478ms63ms3rd
https://wise.com/static-assets/app/_next/static/chunks/29576-98f3c703fc5462a1.js372ms262ms18ms3rd
https://wise.com/static-assets/app/_next/static/chunks/pages/index-87b33a45fe7f7bec.js223ms210ms0ms3rd
https://sst.wise.com/gtag/js?id=G-MFT2R11DFX&cx=c&gtm=4e6460198ms157ms18ms3rd
https://wise.com/static-assets/app/_next/static/chunks/b0ff0e03-aa1cb3b1276d2ee4.js160ms15ms1ms3rd
https://sst.wise.com/wisetag?id=GTM-M7V2XH103ms82ms18ms3rd

Showing top 10 of 14 scripts

F
JS Bundles
Action
57 scripts, 896 KB unused
FIX
57 scripts, 896 KB unused
Warning::
https://wise.com/static-assets/app/_next/static/ch...: 388 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://wise.com/static-assets/app/_next/static/ch...: 105 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 62 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://wise.com/static-assets/app/_next/static/ch...: 59 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sst.wise.com/gtag/js?id=G-MFT2R11DFX&cx=c&...: 57 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 896 KB
896 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://wise.com/static-assets/app/_next/static/chunks/pages/_app-ceca420c74a4fdae.js569 KB388 KB (68%)✓3rd
https://wise.com/static-assets/app/_next/static/chunks/29576-98f3c703fc5462a1.js224 KB105 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=DC-16544908&cx=c&gtm=4e6460129 KB62 KB (48%)✓3rd
https://wise.com/static-assets/app/_next/static/chunks/58213-76198672ffc511de.js103 KB59 KB (57%)✓3rd
https://sst.wise.com/gtag/js?id=G-MFT2R11DFX&cx=c&gtm=4e6460155 KB57 KB (37%)✓3rd
https://sst.wise.com/wisetag?id=GTM-M7V2XH192 KB57 KB (30%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-15666498&cx=c&gtm=4e6460129 KB55 KB (43%)✓3rd
https://wise.com/static-assets/app/_next/static/chunks/8b6b114a-88c8640ef5860d18.js50 KB46 KB (94%)✓3rd
https://wise.com/static-assets/app/_next/static/chunks/main-58c02120f8efa4c8.js46 KB24 KB (53%)✓3rd
https://wise.com/static-assets/app/_next/static/chunks/064e348a-b0488c68715a61a7.js38 KB23 KB (64%)✓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

C
Image Optimization
Action
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Warning::
https://wise.com/public-resources/assets/marketing... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://wise.com/public-resources/assets/marketing... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
44 images 958 KB
0 oversized -0 KB
34 legacy format
3 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

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 (91 KB)
PASS
2 fonts (91 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

91 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 2.0 s 2.5 s FCP 1.2 s LCP 2.7 shttps://wise.com/static-assets/app/_next/static/media/WiseSans-Heavy.4bf7de7a.woff2WiseSans-Heavy.4bf7de7a... https://wise.com/static-assets/app/_next/static/media/WiseSans-Heavy.4bf7de7a.woff2 — 53.4 KiB — 0 ms — font-display: swaphttps://wise.com/static-assets/app/_next/static/media/inter-latin-variable-wghtOnly-normal.40c45725.woff2inter-latin-variable-wg... https://wise.com/static-assets/app/_next/static/media/inter-latin-variable-wghtOnly-normal.40c45725.woff2 — 37.6 KiB — 0 ms — font-display: swap
WiseSans-Heavy.4bf7de7a... woff2 swap
Size 53 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-variable-wg... woff2 swap
Size 38 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
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

A
HTTP Caching
max-age=604800 (1 week)
PASS
max-age=604800 (1 week)
Info::
Cache-Control header is set
Got: public, max-age=604800
Info::
Effective TTL: 1 week (max-age=604800)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=604800

DirectiveValueMeaning
public—Any cache may store this response
max-age604800Cache for 1 week
Effective TTL: 604800 seconds
Network Waterfall
184 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
100% of JavaScript execution is third-party
First-party Third-party 8175ms · 1815KB · £42/mo
wise.com
Other
Costly
Execution 2040ms
Transfer 45 KB
Monthly Cost £11/mo
wise.com
Other
Costly
Execution 2007ms
Transfer 27 KB
Unused 81%
Monthly Cost £10/mo
wise.com
Other
Costly
Execution 1651ms
Transfer 134 KB
Monthly Cost £9/mo
Unattributable
Other
Costly
Execution 598ms
Transfer 0 KB
Monthly Cost £3/mo
wise.com
Other
Costly
Execution 570ms
Transfer 569 KB
Unused 68%
Monthly Cost £3/mo
wise.com
Other
Costly
Execution 372ms
Transfer 224 KB
Unused 47%
Monthly Cost £2/mo
wise.com
Other
Costly
Execution 223ms
Transfer 1 KB
Monthly Cost £1/mo
sst.wise.com
Other
Optional
Execution 198ms
Transfer 155 KB
Unused 37%
Monthly Cost £1/mo
wise.com
Other
Optional
Execution 160ms
Transfer 21 KB
Monthly Cost £1/mo
sst.wise.com
Other
Optional
Execution 103ms
Transfer 192 KB
Unused 30%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 129 KB
Unused 48%
Monthly Cost £0/mo
Google Tag Manager
Tag Manager
Optional
Execution 63ms
Transfer 129 KB
Unused 43%
Monthly Cost £0/mo
chromewebdata
Other
Optional
Execution 63ms
Transfer 0 KB
Monthly Cost £0/mo
wise.com
Other
Optional
Execution 58ms
Transfer 189 KB
Monthly Cost £0/mo

These scripts may cost more than they're worth

  • wise.com adds 2040ms and costs ~£11/month
  • wise.com adds 2007ms and costs ~£10/month
  • wise.com adds 1651ms and costs ~£9/month
  • Unattributable adds 598ms and costs ~£3/month
  • wise.com adds 570ms and costs ~£3/month
  • wise.com adds 372ms and costs ~£2/month
  • wise.com adds 223ms and costs ~£1/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

wise.com takes 2040ms 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

wise.com takes 2007ms 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

81% of wise.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

wise.com takes 1651ms 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 598ms 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

wise.com takes 570ms 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

68% of wise.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

wise.com takes 372ms 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

wise.com takes 223ms 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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