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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
32
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.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

3.29 s

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

26.35 s

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

2.92 s

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

0.032

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

8.12 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.

32.80 s

Page Load Progression

501 ms
1.0 s
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
14
6 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
6.6 MB transferred, 119 requests
FIX
6.6 MB transferred, 119 requests
Critical::
Page weighs 15.7 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 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 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::
119 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
119 requests
1.4 g CO2 per page load
Images 3.3 MiB 50%
JavaScript 1.7 MiB 25%
Fonts 913.7 KiB 13%
Other 446.6 KiB 7%
CSS 267.0 KiB 4%
HTML 49.3 KiB 1%
Other 6.2 KiB 0%
Other 820 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

F
JS Execution Cost
Action
11564ms total JS execution
FIX
11564ms total JS execution
Warning::
Unattributable: 2392ms CPU time
Warning::
https://www.imf.org/op_f3m/M2hsV/1uEBR/aFPp/kQ5kJk...: 1769ms CPU time
Warning::
https://www.imf.org/_next/static/chunks/framework-...: 1665ms CPU time
Warning::
https://www.imf.org/en/home: 1652ms CPU time
Warning::
https://www.imf.org/_next/static/chunks/pages/%5B%...: 1218ms CPU time
Info::
Third-party scripts: 3498ms (30% of total)

Main Thread Breakdown

Script Evaluation 54% Other 19% Style & Layout 12% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
Unattributable2392ms251ms0ms3rd
https://www.imf.org/op_f3m/M2hsV/1uEBR/aFPp/kQ5kJkYiG1/IxAhAQ/Dk5S/WjsjIDRt?v=c224f5de-e023-1555-4f24-52fe3e0017c81769ms1630ms60ms1st
https://www.imf.org/_next/static/chunks/framework-c8bb64664c3c5f7d.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL1665ms1352ms69ms1st
https://www.imf.org/en/home1652ms102ms8ms1st
https://www.imf.org/_next/static/chunks/pages/%5B%5B...path%5D%5D-c39e83664fee91aa.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL1218ms1216ms1ms1st
https://www.imf.org/_next/static/chunks/5571-cb184b697a216af1.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL403ms200ms150ms1st
https://www.googletagmanager.com/gtag/js?id=G-CPJPTDPL31355ms283ms68ms3rd
https://www.imf.org/_next/static/chunks/149.c3534173b964a82a.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL306ms295ms1ms1st
https://ucm-us.verint-cdn.com/files/modules/unified-websdk/2.5.0/database.js291ms200ms1ms3rd
https://www.imf.org/_next/static/chunks/5400-5a31fa76bfcf28a1.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL246ms3ms242ms1st

Showing top 10 of 22 scripts

F
JS Bundles
Action
45 scripts, 697 KB unused
FIX
45 scripts, 697 KB unused
Warning::
https://www.imf.org/_next/static/chunks/5400-5a31f...: 254 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: 697 KB
697 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.imf.org/_next/static/chunks/5400-5a31fa76bfcf28a1.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL385 KB254 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/Dk5S/WjsjIDRt?v=c224f5de-e023-1555-4f24-52fe3e0017c8158 KB32 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://www.imf.org/piwik.js1 KB—✓1st
https://www.imf.org/_next/static/chunks/5353.ca8b52f0d178fb29.js?dpl=dpl_FE1dH5nR71MZBGZQeTizrGRuLqVL11 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

C
Image Optimization
Action
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
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/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/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
14 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

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 (356.6 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s FCP 3.3 s LCP 26.3 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 — 120.3 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: 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: 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
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
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
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
14 hints, 0 missing preconnects
PASS
14 hints, 0 missing preconnects
Info::
Page uses 14 resource hint(s)

Current Resource Hints

preconnect
2
preload
+2
12
dns-prefetch
—
prefetch
—

14 resource hints configured

Network Waterfall
119 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
30% of JavaScript execution is third-party
First-party Third-party 3498ms · 264KB · $46/mo
Unattributable
Other
Costly
Execution 2392ms
Transfer 0 KB
Monthly Cost $32/mo
Google Tag Manager
Tag Manager
Costly
Execution 355ms
Transfer 174 KB
Unused 40%
Monthly Cost $5/mo
ucm-us.verint-cdn.com
Other
Costly
Execution 291ms
Transfer 2 KB
Monthly Cost $4/mo
assets.adobedtm.com
Other
Optional
Execution 138ms
Transfer 35 KB
Monthly Cost $2/mo
assets.adobedtm.com
Other
Optional
Execution 124ms
Transfer 16 KB
Monthly Cost $2/mo
LinkedIn Insight
Advertising
Optional
Execution 78ms
Transfer 19 KB
Monthly Cost $1/mo
ucm-us.verint-cdn.com
Other
Optional
Execution 62ms
Transfer 5 KB
Monthly Cost $1/mo
ucm-us.verint-cdn.com
Other
Optional
Execution 56ms
Transfer 14 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 2392ms and costs ~$32/month
  • Google Tag Manager adds 355ms and costs ~$5/month
  • ucm-us.verint-cdn.com adds 291ms and costs ~$4/month

Unattributable takes 2392ms 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 355ms 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

ucm-us.verint-cdn.com takes 291ms 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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