Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
10.61 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
15.42 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
524 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.120
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
10.61 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.
15.53 s
Page Load Progression
FPage Weight BudgetAction5.7 MB transferred, 82 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction5241ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.iadb.org/themes/contrib/outline_frontend/dist/outline.js?tdm0dt | 1764ms | 799ms | 10ms | 3rd |
| Unattributable | 899ms | 86ms | 0ms | 3rd |
| https://www.iadb.org/en | 799ms | 29ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-M4DCMK4 | 444ms | 371ms | 64ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202302.1.0/otBannerSdk.js | 396ms | 255ms | 31ms | 3rd |
| https://www.iadb.org/cdn-cgi/challenge-platform/scripts/jsd/main.js | 275ms | 237ms | 3ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 261ms | 197ms | 9ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9CQ7ER9V3F&cx=c>m=4e64k0h1 | 260ms | 223ms | 35ms | 3rd |
| https://cdn.jsdelivr.net/npm/powerbi-client@2.22.1/dist/powerbi.min.js | 82ms | 50ms | 29ms | 3rd |
| https://www.iadb.org/sites/default/files/js/js_lNGBvpAoP44zWNLU4EzCfMMEDGMown9aGPw7eaeGhn4.js?scope=header&delta=0&language=en&theme=outline_extended&include=eJx9zmEKwjAMBeALdeuRStrGGZYmpUkRPb1DBBXFf8n3wiNQqyvINcJzWE9DxUNhBHHgPULPxZc-M1MJRaWSkwpwamgGG8Y3W54WdDqTYHqUodRY0WiTbz8h-BnHQkeLfccNSELXC45MCVvGGj-2pTDh8e7fk2mujW44glHrjKlrnz1l1rJb_GHBHJzMqVisY3bg9SV3a_J5hw | 60ms | 45ms | 10ms | 3rd |
DJS BundlesAction19 scripts, 427 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.iadb.org/themes/contrib/outline_frontend/dist/outline.js?tdm0dt | 657 KB | 189 KB (29%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-M4DCMK4 | 164 KB | 62 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9CQ7ER9V3F&cx=c>m=4e64k0h1 | 151 KB | 61 KB (40%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202302.1.0/otBannerSdk.js | 98 KB | 51 KB (52%) | ✓ | 3rd |
| https://cdn.jsdelivr.net/npm/powerbi-client@2.22.1/dist/powerbi.min.js | 35 KB | 22 KB (63%) | ✓ | 3rd |
| https://static.addtoany.com/menu/modules/core.ydpp7jcu.js | 26 KB | 21 KB (82%) | ✓ | 3rd |
| https://www.iadb.org/sites/default/files/js/js_lNGBvpAoP44zWNLU4EzCfMMEDGMown9aGPw7eaeGhn4.js?scope=header&delta=0&language=en&theme=outline_extended&include=eJx9zmEKwjAMBeALdeuRStrGGZYmpUkRPb1DBBXFf8n3wiNQqyvINcJzWE9DxUNhBHHgPULPxZc-M1MJRaWSkwpwamgGG8Y3W54WdDqTYHqUodRY0WiTbz8h-BnHQkeLfccNSELXC45MCVvGGj-2pTDh8e7fk2mujW44glHrjKlrnz1l1rJb_GHBHJzMqVisY3bg9SV3a_J5hw | 37 KB | 21 KB (56%) | ✓ | 3rd |
| https://www.iadb.org/sites/default/files/js/js_TGirFPNk56rKjtnS0ZDwCMj8BbNnmmkckHxbek6dkns.js?scope=header&delta=2&language=en&theme=outline_extended&include=eJx9zmEKwjAMBeALdeuRStrGGZYmpUkRPb1DBBXFf8n3wiNQqyvINcJzWE9DxUNhBHHgPULPxZc-M1MJRaWSkwpwamgGG8Y3W54WdDqTYHqUodRY0WiTbz8h-BnHQkeLfccNSELXC45MCVvGGj-2pTDh8e7fk2mujW44glHrjKlrnz1l1rJb_GHBHJzMqVisY3bg9SV3a_J5hw | 4 KB | — | ✓ | 3rd |
| https://cdn.jsdelivr.net/npm/feather-icons/dist/feather.min.js | 20 KB | — | ✓ | 3rd |
| https://www.iadb.org/sites/default/files/js/js_gjaN-82Nt3luuiDVdRCJlo3BUr2fMxjnUlpfcAqbgDU.js?scope=footer&delta=3&language=en&theme=outline_extended&include=eJx9zmEKwjAMBeALdeuRStrGGZYmpUkRPb1DBBXFf8n3wiNQqyvINcJzWE9DxUNhBHHgPULPxZc-M1MJRaWSkwpwamgGG8Y3W54WdDqTYHqUodRY0WiTbz8h-BnHQkeLfccNSELXC45MCVvGGj-2pTDh8e7fk2mujW44glHrjKlrnz1l1rJb_GHBHJzMqVisY3bg9SV3a_J5hw | 2 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction82 resources · 5.7 MB · 427 KB savings availableFIX
~426.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 82 resources | 5.7 MiB | ||||||
BImage Optimization20 images, 0 KB saveableREVIEW
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (50 KB)PASS
Web fonts
3
50 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
AHTTP Cachingmax-age=86400 (1 day)PASS
public, max-age=86400
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 86400 | Cache for 1 day |
Network Waterfall82 requests over 3663msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.iadb.org www.iadb.org | Other | 1764ms | 657 KB | 29% | $23/mo | Costly |
Unattributable Unattributable | Other | 899ms | 0 KB | — | $12/mo | Costly |
www.iadb.org www.iadb.org | Other | 799ms | 14 KB | — | $11/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 444ms | 164 KB | 38% | $6/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 396ms | 98 KB | 52% | $5/mo | Essential |
www.iadb.org www.iadb.org | Other | 275ms | 0 KB | — | $4/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 261ms | 26 KB | — | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 260ms | 151 KB | 40% | $3/mo | Costly |
jsDelivr cdn.jsdelivr.net | CDN | 82ms | 35 KB | 63% | $1/mo | Optional |
www.iadb.org www.iadb.org | Other | 60ms | 37 KB | 56% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.iadb.org adds 1764ms and costs ~$23/month
- Unattributable adds 899ms and costs ~$12/month
- www.iadb.org adds 799ms and costs ~$11/month
- Google Tag Manager adds 444ms and costs ~$6/month
- www.iadb.org adds 275ms and costs ~$4/month
- Microsoft Clarity adds 261ms and costs ~$3/month
- Google Tag Manager adds 260ms and costs ~$3/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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
www.iadb.org takes 1764ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 899ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.iadb.org takes 799ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 444ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
52% of OneTrust's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
www.iadb.org takes 275ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Microsoft Clarity takes 261ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 260ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
63% of jsDelivr's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
56% of www.iadb.org's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev