Performance
· 15 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.
4.83 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.02 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.507
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.51 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.
5.04 s
Page Load Progression
FPage Weight BudgetAction8.1 MB transferred, 114 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
DPage Weight InventoryAction114 resources · 8.1 MB · 286 KB savings availableFIX
~286.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 114 resources | 8.1 MiB | ||||||
CImage OptimizationAction60 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
CJS Execution CostAction1554ms total JS executionREVIEW
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 | 758ms | 518ms | 8ms | 3rd |
| https://www.cepal.org/ | 298ms | 1ms | 0ms | 3rd |
| Unattributable | 296ms | 4ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-SPMBKHZPHZ | 111ms | 88ms | 17ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-SBQ764PNY7 | 91ms | 74ms | 15ms | 3rd |
CJS BundlesAction22 scripts, 286 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-SPMBKHZPHZ | 161 KB | 64 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-SBQ764PNY7 | 155 KB | 64 KB (41%) | ✓ | 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 | 79 KB | 43 KB (55%) | ✓ | 3rd |
| https://statistics.cepal.org/charts/desigualdad/alc/js/callData.js | 0 KB | — | ✓ | 3rd |
| https://statistics.cepal.org/charts/desigualdad/alc/js/echarts.min.js | 0 KB | — | ✓ | 3rd |
| https://www.cepal.org/modules/contrib/google_tag/js/gtag.js?tdwdqg | 1 KB | — | ✓ | 3rd |
| https://statistics.cepal.org/charts/desigualdad/alc/js/echarts.min.js | 0 KB | — | ✓ | 3rd |
| https://statistics.cepal.org/charts/desigualdad/alc/js/genVars.js | 0 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
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 Loading7 fonts (134 KB)PASS
Web fonts
7
134 KB total
Render-blocking
0
of 7
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
AHTTP Cachingmax-age=86400 (1 day)PASS
max-age=86400
| Directive | Value | Meaning |
|---|---|---|
| max-age | 86400 | Cache for 1 day |
Network Waterfall114 requests over 9738msINFO
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 | 758ms | 79 KB | 55% | $10/mo | Costly |
www.cepal.org www.cepal.org | Other | 298ms | 34 KB | — | $4/mo | Costly |
Unattributable Unattributable | Other | 296ms | 0 KB | — | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 111ms | 161 KB | 40% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 91ms | 155 KB | 41% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.cepal.org adds 758ms and costs ~$10/month
- www.cepal.org adds 298ms and costs ~$4/month
- Unattributable adds 296ms and costs ~$4/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 758ms 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
www.cepal.org takes 298ms 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 296ms 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