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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
1
PASS
9
INFO
2

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

Mobile Desktop
27
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.

4.12 s

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

16.69 s

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

5.68 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.

12.36 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.

32.38 s

Page Load Progression

2.9 s
5.7 s
8.6 s
11.4 s
14.3 s
17.2 s
20.0 s
22.9 s
Checks
16
9 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
5.2 MB transferred, 180 requests
FIX
5.2 MB transferred, 180 requests
Critical::
Page weighs 13.7 MB (5.2 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
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 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::
180 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
5.2 MB / 2.4 MB budget
5.2 MB transferred
180 requests
1.1 g CO2 per page load
JavaScript 2.3 MiB 44%
Other 1.2 MiB 24%
Images 1.1 MiB 22%
CSS 205.5 KiB 4%
HTML 142.1 KiB 3%
Other 93.2 KiB 2%
Fonts 91.0 KiB 2%
Other 26.2 KiB 0%
Other 13.2 KiB 0%
Other 938 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

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

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 (5.2 MiB of 5.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
31863ms total JS execution
FIX
31863ms total JS execution
Warning::
https://wise.com/static-assets/app/_next/static/ch...: 8755ms CPU time
Warning::
https://wise.com/static-assets/app/_next/static/ch...: 6290ms CPU time
Warning::
https://wise.com/: 5763ms CPU time
Warning::
https://wise.com/static-assets/app/_next/static/ch...: 2559ms CPU time
Warning::
Unattributable: 2348ms CPU time
Warning::
Third-party scripts: 31863ms (100% of total)

Main Thread Breakdown

Script Evaluation 37% Other 28% Style & Layout 18% Rendering 11% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://wise.com/static-assets/app/_next/static/chunks/4622-ac38ecd0246fe605.js8755ms1043ms7ms3rd
https://wise.com/static-assets/app/_next/static/chunks/framework-e3f3cb15367a2851.js6290ms4132ms17ms3rd
https://wise.com/5763ms46ms3ms3rd
https://wise.com/static-assets/app/_next/static/chunks/pages/_app-ceca420c74a4fdae.js2559ms2088ms380ms3rd
Unattributable2348ms117ms0ms3rd
https://wise.com/static-assets/app/_next/static/chunks/29576-98f3c703fc5462a1.js1495ms1117ms75ms3rd
https://sst.wise.com/wisetag?id=GTM-M7V2XH1254ms1046ms74ms3rd
https://wise.com/static-assets/app/_next/static/chunks/pages/index-87b33a45fe7f7bec.js1087ms1037ms0ms3rd
https://sst.wise.com/gtag/js?id=G-MFT2R11DFX&cx=c&gtm=4e6461h2506ms451ms43ms3rd
https://wise.com/static-assets/app/_next/static/css/c47d2309f28e79d2.css481ms0ms0ms3rd

Showing top 10 of 17 scripts

F
JS Bundles
Action
57 scripts, 897 KB unused
FIX
57 scripts, 897 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...: 106 KB unused (48%)
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 (58%)
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: 897 KB
897 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 KB106 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=DC-16544908&cx=c&gtm=4e6461h2129 KB62 KB (48%)✓3rd
https://wise.com/static-assets/app/_next/static/chunks/58213-76198672ffc511de.js103 KB59 KB (58%)✓3rd
https://sst.wise.com/gtag/js?id=G-MFT2R11DFX&cx=c&gtm=4e6461h2155 KB57 KB (37%)✓3rd
https://sst.wise.com/wisetag?id=GTM-M7V2XH192 KB56 KB (29%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-15666498&cx=c&gtm=4e6461h2129 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

B
Image Optimization
42 images, 0 KB saveable
REVIEW
42 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.
42 images 1.1 MB
0 oversized -0 KB
34 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

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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 4.1 s LCP 16.7 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
12 hints, 0 missing preconnects
PASS
12 hints, 0 missing preconnects
Info::
Page uses 12 resource hint(s)

Current Resource Hints

preconnect
4
preload
5
dns-prefetch
3
prefetch
—

12 resource hints configured

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
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
180 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 31863ms · 1976KB · £165/mo
wise.com
Other
Costly
Execution 8755ms
Transfer 27 KB
Unused 81%
Monthly Cost £45/mo
wise.com
Other
Costly
Execution 6290ms
Transfer 45 KB
Monthly Cost £33/mo
wise.com
Other
Costly
Execution 5763ms
Transfer 141 KB
Monthly Cost £30/mo
wise.com
Other
Costly
Execution 2559ms
Transfer 569 KB
Unused 68%
Monthly Cost £13/mo
Unattributable
Other
Costly
Execution 2348ms
Transfer 0 KB
Monthly Cost £12/mo
wise.com
Other
Costly
Execution 1495ms
Transfer 224 KB
Unused 48%
Monthly Cost £8/mo
sst.wise.com
Other
Costly
Execution 1254ms
Transfer 192 KB
Unused 29%
Monthly Cost £6/mo
wise.com
Other
Costly
Execution 1087ms
Transfer 1 KB
Monthly Cost £6/mo
sst.wise.com
Other
Costly
Execution 506ms
Transfer 155 KB
Unused 37%
Monthly Cost £3/mo
wise.com
Other
Costly
Execution 481ms
Transfer 189 KB
Monthly Cost £2/mo
wise.com
Other
Costly
Execution 303ms
Transfer 21 KB
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Costly
Execution 256ms
Transfer 129 KB
Unused 43%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Costly
Execution 222ms
Transfer 129 KB
Unused 48%
Monthly Cost £1/mo
wise.com
Other
Optional
Execution 186ms
Transfer 46 KB
Unused 53%
Monthly Cost £1/mo
chromewebdata
Other
Optional
Execution 181ms
Transfer 0 KB
Monthly Cost £1/mo
wise.com
Other
Optional
Execution 127ms
Transfer 100 KB
Monthly Cost £1/mo
collector-20079.tvsquared.com
Other
Optional
Execution 51ms
Transfer 9 KB
Monthly Cost £0/mo

These scripts may cost more than they're worth

  • wise.com adds 8755ms and costs ~£45/month
  • wise.com adds 6290ms and costs ~£33/month
  • wise.com adds 5763ms and costs ~£30/month
  • wise.com adds 2559ms and costs ~£13/month
  • Unattributable adds 2348ms and costs ~£12/month
  • wise.com adds 1495ms and costs ~£8/month
  • sst.wise.com adds 1254ms and costs ~£6/month
  • wise.com adds 1087ms and costs ~£6/month
  • sst.wise.com adds 506ms and costs ~£3/month
  • wise.com adds 481ms and costs ~£2/month
  • wise.com adds 303ms and costs ~£2/month
  • Google Tag Manager adds 256ms and costs ~£1/month
  • Google Tag Manager adds 222ms 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 8755ms 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 6290ms 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 5763ms 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 2559ms 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

Unattributable takes 2348ms 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 1495ms 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

sst.wise.com takes 1254ms 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 1087ms 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

sst.wise.com takes 506ms 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 481ms 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 303ms 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 256ms 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 222ms 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

53% 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

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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