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https://www.worldbank.org

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
2
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
100
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

348 ms

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

368 ms

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

34 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.009

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

771 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.07 s

Page Load Progression

607 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.9 s
Checks
14
7 PASS 3 REVIEW 2 FIX
F
Page Weight Budget
Action
9.4 MB transferred, 158 requests
FIX
9.4 MB transferred, 158 requests
Critical::
Page weighs 12.2 MB (9.4 MB transferred)
Warning::
Images are 4.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.5 MB
Warning::
JavaScript is 711 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 711 KB
Warning::
158 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.0 g CO2 per page load
9.4 MB / 2.4 MB budget
9.4 MB transferred
158 requests
2.0 g CO2 per page load
Images 4.5 MiB 48%
Other 3.9 MiB 42%
JavaScript 711.4 KiB 7%
Fonts 116.2 KiB 1%
CSS 71.6 KiB 1%
Other 29.9 KiB 0%
HTML 10.7 KiB 0%
Other 7.6 KiB 0%
Other 7.4 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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
74% third-party, 0 ms blocking
FIX
74% third-party, 0 ms blocking
Warning::
Third-party code accounts for 74% of page weight (6.9 MiB of 9.4 MiB)
Info::
Third-party blocking time is low (0 ms)
26%
74%
First-party Third-party
B
Image Optimization
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
Warning::
https://www.worldbank.org/content/dam/sites/servic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
31 images 4.5 MB
0 oversized -0 KB
25 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

B
JS Execution Cost
857ms total JS execution
REVIEW
857ms total JS execution
Warning::
Unattributable: 366ms CPU time
Info::
https://www.worldbank.org/ext/en/home: 230ms CPU time
Info::
https://assets.adobedtm.com/223f6e2cf7c9/3eb6c9b72...: 187ms CPU time
Info::
https://script.crazyegg.com/pages/versioned/common...: 74ms CPU time
Warning::
Third-party scripts: 627ms (73% of total)

Main Thread Breakdown

Script Evaluation 44% Other 32% Style & Layout 11% Script Parsing & Compilation 6% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable366ms54ms0ms3rd
https://www.worldbank.org/ext/en/home230ms11ms0ms1st
https://assets.adobedtm.com/223f6e2cf7c9/3eb6c9b72a93/launch-7bc0cdc67098.min.js187ms154ms17ms3rd
https://script.crazyegg.com/pages/versioned/common-scripts/fa37f361d63404d4cc11b194e70c4ff0.js74ms65ms5ms3rd
C
JS Bundles
Action
61 scripts, 202 KB unused
REVIEW
61 scripts, 202 KB unused
Warning::
https://connect.facebook.net/en_US/bundle/sdk.js/: 54 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-972...: 50 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/223f6e2cf7c9/3eb6c9b72...: 39 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 34 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.crazyegg.com/pages/versioned/common...: 24 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 202 KB
202 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://connect.facebook.net/en_US/bundle/sdk.js/78 KB54 KB (70%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-972661263145 KB50 KB (35%)✓3rd
https://assets.adobedtm.com/223f6e2cf7c9/3eb6c9b72a93/launch-7bc0cdc67098.min.js107 KB39 KB (36%)✓3rd
https://connect.facebook.net/en_US/fbevents.js95 KB34 KB (36%)✓3rd
https://script.crazyegg.com/pages/versioned/common-scripts/fa37f361d63404d4cc11b194e70c4ff0.js51 KB24 KB (48%)✓3rd
https://www.worldbank.org/ext/blocks/header/constants.js1 KB—✓1st
https://connect.facebook.net/signals/config/1458892451075570?v=2.9.291&r=stable&domain=www.worldbank.org&hme=295b1b33901e14aeab879c0b58f907ef4d5f44fdd19814310771af911c5f6ac8&ex_m=102%2C198%2C147%2C22%2C70%2C71%2C139%2C66%2C65%2C11%2C155%2C88%2C16%2C132%2C124%2C37%2C73%2C76%2C130%2C152%2C157%2C8%2C4%2C5%2C7%2C6%2C3%2C89%2C99%2C158%2C163%2C212%2C60%2C179%2C180%2C53%2C267%2C30%2C72%2C224%2C223%2C222%2C23%2C32%2C101%2C59%2C10%2C61%2C95%2C96%2C97%2C103%2C127%2C31%2C29%2C129%2C126%2C125%2C148%2C74%2C151%2C149%2C150%2C48%2C58%2C120%2C15%2C154%2C43%2C254%2C255%2C253%2C26%2C27%2C28%2C46%2C140%2C75%2C110%2C18%2C20%2C42%2C38%2C40%2C39%2C81%2C90%2C94%2C108%2C138%2C141%2C44%2C109%2C24%2C21%2C116%2C67%2C35%2C143%2C142%2C144%2C135%2C133%2C25%2C34%2C57%2C107%2C153%2C68%2C17%2C145%2C112%2C79%2C64%2C19%2C83%2C84%2C113%2C82%2C33%2C284%2C205%2C194%2C195%2C193%2C287%2C279%2C50%2C206%2C105%2C128%2C78%2C118%2C52%2C45%2C47%2C111%2C117%2C123%2C56%2C62%2C51%2C54%2C98%2C156%2C1%2C121%2C14%2C119%2C12%2C2%2C55%2C91%2C63%2C115%2C87%2C86%2C159%2C160%2C92%2C93%2C9%2C122%2C100%2C49%2C136%2C85%2C77%2C69%2C114%2C104%2C41%2C137%2C0%2C80%2C131%2C134%2C146%2C36%2C106%2C13%2C16138 KB—✓3rd
https://www.worldbank.org/ext/scripts/utils.js12 KB—✗1st
https://www.worldbank.org/ext/scripts/carousel-init.js2 KB—✓1st
https://www.worldbank.org/ext/blocks/popup-card/popup-card.js3 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

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
3 fonts (116 KB)
PASS
3 fonts (116 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

116 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 348 ms LCP 368 mshttps://www.worldbank.org/ext/fonts/OpenSans-Bold.woff2OpenSans-Bold.woff2 https://www.worldbank.org/ext/fonts/OpenSans-Bold.woff2 — 18.4 KiB — 0 ms — font-display: swaphttps://www.worldbank.org/ext/fonts/OpenSans-Regular.woff2OpenSans-Regular.woff2 https://www.worldbank.org/ext/fonts/OpenSans-Regular.woff2 — 59.0 KiB — 0 ms — font-display: swaphttps://www.worldbank.org/ext/fonts/loopicon.ttf?eq39m6loopicon.ttf https://www.worldbank.org/ext/fonts/loopicon.ttf?eq39m6 — 38.8 KiB — 0 ms — font-display: swap
OpenSans-Bold.woff2 woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
OpenSans-Regular.woff2 woff2 swap
Size 59 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
loopicon.ttf ttf swap
Size 39 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~12 KB and ~24 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
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=60 (1 minute)
PASS
max-age=60 (1 minute)
Info::
Cache-Control header is set
Got: public, max-age=60
Info::
Effective TTL: 1 minute (max-age=60)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=60

DirectiveValueMeaning
public—Any cache may store this response
max-age60Cache for 1 minute
Effective TTL: 60 seconds
Network Waterfall
158 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
73% of JavaScript execution is third-party
First-party Third-party 627ms · 159KB · $8/mo
Unattributable
Other
Costly
Execution 366ms
Transfer 0 KB
Monthly Cost $5/mo
assets.adobedtm.com
Other
Optional
Execution 187ms
Transfer 107 KB
Unused 36%
Monthly Cost $2/mo
script.crazyegg.com
Other
Optional
Execution 74ms
Transfer 51 KB
Unused 48%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 366ms and costs ~$5/month

73% 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

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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