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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
3
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
57
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.

1.03 s

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

3.97 s

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

332 ms

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

0.007

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

2.82 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.

6.06 s

Page Load Progression

543 ms
1.1 s
1.6 s
2.2 s
2.7 s
3.3 s
3.8 s
4.3 s
Checks
14
6 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
6.6 MB transferred, 120 requests
FIX
6.6 MB transferred, 120 requests
Critical::
Page weighs 15.6 MB (6.6 MB transferred)
Warning::
Images are 3.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.3 MB
Warning::
JavaScript is 1.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.6 MB
Info::
Fonts are 914 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 914 KB
Info::
CSS is 267 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 267 KB
Warning::
120 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.4 g CO2 per page load
6.6 MB / 2.4 MB budget
6.6 MB transferred
120 requests
1.4 g CO2 per page load
Images 3.3 MiB 50%
JavaScript 1.6 MiB 25%
Fonts 913.6 KiB 13%
Other 446.9 KiB 7%
CSS 267.0 KiB 4%
HTML 49.3 KiB 1%
Other 6.0 KiB 0%
Other 811 B 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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
JS Execution Cost
Action
2717ms total JS execution
FIX
2717ms total JS execution
Warning::
Unattributable: 556ms CPU time
Warning::
https://www.imf.org/en/home: 492ms CPU time
Warning::
https://www.imf.org/op_f3m/M2hsV/1uEBR/aFPp/kQ5kJk...: 457ms CPU time
Warning::
https://www.imf.org/_next/static/chunks/framework-...: 390ms CPU time
Warning::
https://www.imf.org/_next/static/chunks/pages/%5B%...: 294ms CPU time
Info::
Third-party scripts: 733ms (27% of total)

Main Thread Breakdown

Script Evaluation 54% Other 21% Style & Layout 11% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
Unattributable556ms70ms0ms3rd
https://www.imf.org/en/home492ms29ms4ms1st
https://www.imf.org/op_f3m/M2hsV/1uEBR/aFPp/kQ5kJkYiG1/IxAhAQ/VHsc/QWIuDztt?v=1ee662af-e5a4-40a1-ba5d-3c8efaba17c8457ms424ms15ms1st
https://www.imf.org/_next/static/chunks/framework-c8bb64664c3c5f7d.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL390ms316ms19ms1st
https://www.imf.org/_next/static/chunks/pages/%5B%5B...path%5D%5D-c39e83664fee91aa.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL294ms293ms0ms1st
https://www.imf.org/_next/static/chunks/5571-cb184b697a216af1.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL109ms49ms37ms1st
https://www.googletagmanager.com/gtag/js?id=G-CPJPTDPL31102ms83ms18ms3rd
https://ucm-us.verint-cdn.com/files/modules/unified-websdk/2.5.0/database.js74ms50ms0ms3rd
https://www.imf.org/_next/static/chunks/149.c3534173b964a82a.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL67ms65ms0ms1st
https://www.imf.org/_next/static/css/21107d8c4a675cc4.css?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL67ms0ms0ms1st

Showing top 10 of 12 scripts

F
JS Bundles
Action
45 scripts, 696 KB unused
FIX
45 scripts, 696 KB unused
Warning::
https://www.imf.org/_next/static/chunks/5400-5a31f...: 255 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.imf.org/_next/static/chunks/5571-cb184...: 151 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.imf.org/_next/static/chunks/7ff8369e-6...: 76 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CPJP...: 69 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.imf.org/_next/static/chunks/framework-...: 68 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 696 KB
696 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.imf.org/_next/static/chunks/5400-5a31fa76bfcf28a1.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL385 KB255 KB (66%)✓1st
https://www.imf.org/_next/static/chunks/5571-cb184b697a216af1.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL315 KB151 KB (49%)✓1st
https://www.imf.org/_next/static/chunks/7ff8369e-6719b91168b9f5c3.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL102 KB76 KB (75%)✓1st
https://www.googletagmanager.com/gtag/js?id=G-CPJPTDPL31174 KB69 KB (40%)✓3rd
https://www.imf.org/_next/static/chunks/framework-c8bb64664c3c5f7d.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL115 KB68 KB (59%)✓1st
https://www.imf.org/op_f3m/M2hsV/1uEBR/aFPp/kQ5kJkYiG1/IxAhAQ/VHsc/QWIuDztt?v=1ee662af-e5a4-40a1-ba5d-3c8efaba17c8153 KB31 KB (20%)✓1st
https://www.imf.org/_next/static/chunks/2917-391112d977cb0d3c.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL32 KB25 KB (79%)✓1st
https://ucm-us.verint-cdn.com/files/sites/imf-org/live/sdk.js42 KB21 KB (50%)✓3rd
https://ucm-us.verint-cdn.com/files/sites/imf-org//sdk.js1 KB—✓3rd
https://ucm-us.verint-cdn.com/files/sites/imf-org/live/customcode.js2 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

C
Image Optimization
Action
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://www.imf.org/-/media/images/imf/data/imf-se... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/home-page/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/home-page/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/data/imf-lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/home-page/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/home-page/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/home-page/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/home-page/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/live-page/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/home-page/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/home-page/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/home-page/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/home-page/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/home-page/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.imf.org/-/media/images/imf/home-page/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 3.3 MB
0 oversized -0 KB
32 legacy format
15 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

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

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

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

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

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::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
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+
Third-Party Impact
5% third-party, 0 ms blocking
PASS
5% third-party, 0 ms blocking
Info::
Third-party code accounts for 5% of page weight (356.7 KiB of 6.6 MiB)
Info::
Third-party blocking time is low (0 ms)
95%
First-party Third-party
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
6 fonts (914 KB)
PASS
6 fonts (914 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

914 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.0 s LCP 4.0 shttps://www.imf.org/_next/static/media/AvenirNextWorld-Regular.be5f8f6d.ttfAvenirNextWorld-Regular... https://www.imf.org/_next/static/media/AvenirNextWorld-Regular.be5f8f6d.ttf — 185.7 KiB — 0 ms — font-display: swaphttps://www.imf.org/_next/static/media/fa-brands-400.b6033b54.woff2fa-brands-400.b6033b54.... https://www.imf.org/_next/static/media/fa-brands-400.b6033b54.woff2 — 107.3 KiB — 0 ms — font-display: swaphttps://www.imf.org/_next/static/media/fa-regular-400.33807fd1.woff2fa-regular-400.33807fd1... https://www.imf.org/_next/static/media/fa-regular-400.33807fd1.woff2 — 148.7 KiB — 0 ms — font-display: swaphttps://www.imf.org/_next/static/media/fa-solid-900.99e71815.woff2fa-solid-900.99e71815.w... https://www.imf.org/_next/static/media/fa-solid-900.99e71815.woff2 — 120.2 KiB — 0 ms — font-display: swaphttps://www.imf.org/_next/static/media/AvenirNextWorld-Demi.5604e634.ttfAvenirNextWorld-Demi.56... https://www.imf.org/_next/static/media/AvenirNextWorld-Demi.5604e634.ttf — 190.5 KiB — 0 ms — font-display: swaphttps://www.imf.org/_next/static/media/fa-light-300.08eeba54.woff2fa-light-300.08eeba54.w... https://www.imf.org/_next/static/media/fa-light-300.08eeba54.woff2 — 161.2 KiB — 0 ms — font-display: swap
AvenirNextWorld-Regular... ttf swap
Size 186 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
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-brands-400.b6033b54.... woff2 swap
Size 107 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
fa-regular-400.33807fd1... woff2 swap
Size 149 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
fa-solid-900.99e71815.w... woff2 swap
Size 120 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
AvenirNextWorld-Demi.56... ttf swap
Size 190 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
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-light-300.08eeba54.w... woff2 swap
Size 161 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 ~570 KB and ~1140 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
120 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
27% of JavaScript execution is third-party
First-party Third-party 733ms · 176KB · $10/mo
Unattributable
Other
Costly
Execution 556ms
Transfer 0 KB
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Optional
Execution 102ms
Transfer 174 KB
Unused 40%
Monthly Cost $1/mo
ucm-us.verint-cdn.com
Other
Optional
Execution 74ms
Transfer 2 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 556ms and costs ~$7/month

Unattributable takes 556ms 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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