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.
5.01 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.74 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.
0.020
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.38 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.
6.75 s
Page Load Progression
FPage Weight BudgetAction2.9 MB transferred, 90 requestsFIX
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction90 resources · 2.9 MB · 298 KB savings availableFIX
~298.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 90 resources | 2.9 MiB | ||||||
BImage Optimization12 images, 0 KB saveableREVIEW
BJS Execution Cost501ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.gov.br/imprensanacional/pt-br | 291ms | 2ms | 2ms | 3rd |
| https://www.gov.br/imprensanacional/portal_javascripts/Sunburst%20Theme/resourceplone.app.jquery-cachekey-8a2a4a3afeef6b357770cf9b13a6e0c6.js | 107ms | 69ms | 3ms | 3rd |
| Unattributable | 103ms | 2ms | 0ms | 3rd |
CJS BundlesAction27 scripts, 298 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.gov.br/imprensanacional/++theme++padrao_govbr/govbrtheme-45cb9c1.js | 141 KB | 102 KB (73%) | ✓ | 3rd |
| https://www.gov.br/imprensanacional/portal_javascripts/Sunburst%20Theme/collective.js.jqueryui.custom.min-cachekey-1fe1144781002d30dc4efa18e980df09.js | 107 KB | 70 KB (67%) | ✓ | 3rd |
| https://barra.sistema.gov.br/v1/barra-govbr-wc.iife.js | 59 KB | 36 KB (62%) | ✓ | 3rd |
| https://www.gov.br/imprensanacional/portal_javascripts/Sunburst%20Theme/resourceplone.formwidget.recurrencejquery.tmpl-beta1-cachekey-9b075858129ebf97bfae387e2c52dcaa.js | 45 KB | 36 KB (82%) | ✓ | 3rd |
| https://www.gov.br/imprensanacional/++resource++brasil.gov.tiles/brasilgovtiles-7d5753d.js | 42 KB | 34 KB (82%) | ✓ | 3rd |
| https://www.gov.br/imprensanacional/portal_javascripts/Sunburst%20Theme/resourcebrasil.gov.tilesvendorjquery.jplayer.min-cachekey-6ea901b82d93f98e1e166a3fdf8af27d.js | 25 KB | 20 KB (84%) | ✗ | 3rd |
| https://www.gov.br/imprensanacional/portal_javascripts/Sunburst%20Theme/++resource++govbr.recomendacao/govbr.recom.c339e72c8ffbb2f6c087.js | 14 KB | — | ✓ | 3rd |
| https://www.gov.br/imprensanacional/++resource++govbr.policy/lgpd_cookie_handling_1_3_91.js | 3 KB | — | ✓ | 3rd |
| https://www.gov.br/imprensanacional/portal_javascripts/Sunburst%20Theme/resourcecollective.coverjsmain-cachekey-809cd0a433551a6d88ffe26e5eb4229d.js | 23 KB | — | ✓ | 3rd |
| https://www.gov.br/imprensanacional/portal_javascripts/Sunburst%20Theme/resourcegovbr.policybrowser-update-cachekey-7062ef8658a2da7a740d86aa40368f6e.js | 5 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
BHTTP CachingpublicREVIEW
public
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading18 fonts (1434 KB)PASS
Web fonts
18
1434 KB total
Render-blocking
0
of 18
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- 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 ~136 KB and ~272 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall90 requests over 6258msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.gov.br www.gov.br | Other | 291ms | 23 KB | — | R$26/mo | Costly |
www.gov.br www.gov.br | Other | 107ms | 34 KB | — | R$9/mo | Optional |
Unattributable Unattributable | Other | 103ms | 0 KB | — | R$9/mo | Optional |
These scripts may cost more than they're worth
- www.gov.br adds 291ms and costs ~R$26/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.gov.br takes 291ms 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