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.
9.11 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
25.02 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
507 ms
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.
24.47 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.
34.55 s
Page Load Progression
864 ms 1.7 s 2.6 s 3.5 s 4.3 s
5.2 s
6.0 s
6.9 sFPage Weight BudgetAction8.1 MB transferred, 186 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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction7198ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.cepal.org/sites/default/files/js/js_ONpIxVnq_BwZR2GTKWxu1Y2POCyZv5YsXze-A_vFP6Y.js?scope=footer&delta=0&language=es&theme=eclacstrap_cepal&include=eJxtj-FqwzAQg1_ImaEvZM6OYm5osfGZNtnTL6QuHW3_CH2IE6eI3tECtloMc1iUB5rPWNGELn6ODUTqQciwlhUuUn53f-rwiWJGtT6YReZha-F-FPGBrfyoPTqaLMPdEKvD0ZOsN6khisE_-X-UUIU-s0ThZKlp7fae35--TJISTKNS-z4turlcSiZCl-zzIa_8Jd-yOavUGWPjgHPU8Ktc3VVxM3_qefQHv1iHtQ | 3350ms | 2278ms | 37ms | 3rd |
| Unattributable | 1663ms | 18ms | 0ms | 3rd |
| https://www.cepal.org/ | 1095ms | 5ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-SPMBKHZPHZ | 420ms | 329ms | 67ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-SBQ764PNY7 | 369ms | 297ms | 62ms | 3rd |
| https://statistics.cepal.org/assets/jquery.min.js | 168ms | 127ms | 13ms | 3rd |
| https://statistics.cepal.org/portal/cepalstat/carousel-home-content.html?lang=es | 133ms | 11ms | 4ms | 3rd |
DJS BundlesAction24 scripts, 330 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-SBQ764PNY7 | 155 KB | 64 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-SPMBKHZPHZ | 161 KB | 64 KB (40%) | ✓ | 3rd |
| https://styles.cepal.org/bootstrap.bundle.min.js | 79 KB | 61 KB (78%) | ✓ | 3rd |
| https://statistics.cepal.org/assets/jquery.min.js | 88 KB | 55 KB (62%) | ✓ | 3rd |
| https://www.cepal.org/sites/default/files/js/js_ONpIxVnq_BwZR2GTKWxu1Y2POCyZv5YsXze-A_vFP6Y.js?scope=footer&delta=0&language=es&theme=eclacstrap_cepal&include=eJxtj-FqwzAQg1_ImaEvZM6OYm5osfGZNtnTL6QuHW3_CH2IE6eI3tECtloMc1iUB5rPWNGELn6ODUTqQciwlhUuUn53f-rwiWJGtT6YReZha-F-FPGBrfyoPTqaLMPdEKvD0ZOsN6khisE_-X-UUIU-s0ThZKlp7fae35--TJISTKNS-z4turlcSiZCl-zzIa_8Jd-yOavUGWPjgHPU8Ktc3VVxM3_qefQHv1iHtQ | 0 KB | 43 KB (55%) | ✓ | 3rd |
| https://www.cepal.org/sites/default/files/js/js_ONpIxVnq_BwZR2GTKWxu1Y2POCyZv5YsXze-A_vFP6Y.js?scope=footer&delta=0&language=es&theme=eclacstrap_cepal&include=eJxtj-FqwzAQg1_ImaEvZM6OYm5osfGZNtnTL6QuHW3_CH2IE6eI3tECtloMc1iUB5rPWNGELn6ODUTqQciwlhUuUn53f-rwiWJGtT6YReZha-F-FPGBrfyoPTqaLMPdEKvD0ZOsN6khisE_-X-UUIU-s0ThZKlp7fae35--TJISTKNS-z4turlcSiZCl-zzIa_8Jd-yOavUGWPjgHPU8Ktc3VVxM3_qefQHv1iHtQ | 79 KB | 43 KB (55%) | ✓ | 3rd |
| https://statistics.cepal.org/charts/desigualdad/alc/js/callData.js | 0 KB | — | ✓ | 3rd |
| https://statistics.cepal.org/charts/carousel/2025/economicas/js/chart2.2.10_al.js | 0 KB | — | ✓ | 3rd |
| https://www.cepal.org/sites/default/files/js/js_cFF5pUHBUHLMRX3o2pHz1jziVqhCr6UwQYVQZX3rrZU.js?scope=footer&delta=2&language=es&theme=eclacstrap_cepal&include=eJxtj-FqwzAQg1_ImaEvZM6OYm5osfGZNtnTL6QuHW3_CH2IE6eI3tECtloMc1iUB5rPWNGELn6ODUTqQciwlhUuUn53f-rwiWJGtT6YReZha-F-FPGBrfyoPTqaLMPdEKvD0ZOsN6khisE_-X-UUIU-s0ThZKlp7fae35--TJISTKNS-z4turlcSiZCl-zzIa_8Jd-yOavUGWPjgHPU8Ktc3VVxM3_qefQHv1iHtQ | 11 KB | — | ✓ | 3rd |
| https://www.cepal.org/modules/contrib/google_tag/js/gtag.js?tdwdqg | 1 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
DPage Weight InventoryAction186 resources · 8.1 MB · 330 KB savings availableFIX
~329.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 186 resources | 8.1 MiB | ||||||
CImage OptimizationAction61 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading8 fonts (155 KB)PASS
Web fonts
8
155 KB total
Render-blocking
0
of 8
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
AHTTP Cachingmax-age=86400 (1 day)PASS
max-age=86400
| Directive | Value | Meaning |
|---|---|---|
| max-age | 86400 | Cache for 1 day |
Network Waterfall186 requests over 10458msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.cepal.org www.cepal.org | Other | 3350ms | 0 KB | 55% | $44/mo | Costly |
Unattributable Unattributable | Other | 1663ms | 0 KB | — | $22/mo | Costly |
www.cepal.org www.cepal.org | Other | 1095ms | 34 KB | — | $15/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 420ms | 161 KB | 40% | $6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 369ms | 155 KB | 41% | $5/mo | Costly |
statistics.cepal.org statistics.cepal.org | Other | 168ms | 88 KB | 62% | $2/mo | Optional |
statistics.cepal.org statistics.cepal.org | Other | 133ms | 6 KB | — | $2/mo | Optional |
These scripts may cost more than they're worth
- www.cepal.org adds 3350ms and costs ~$44/month
- Unattributable adds 1663ms and costs ~$22/month
- www.cepal.org adds 1095ms and costs ~$15/month
- Google Tag Manager adds 420ms and costs ~$6/month
- Google Tag Manager adds 369ms and costs ~$5/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.cepal.org takes 3350ms 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
55% of www.cepal.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
Unattributable takes 1663ms 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.cepal.org takes 1095ms 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 420ms 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 369ms 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
62% of statistics.cepal.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