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https://scielo.br

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
90
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

1.24 s

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

1.72 s

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

11 ms

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

0.001

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

1.24 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.

2.04 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
6 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.1 MB transferred, 51 requests
FIX
2.1 MB transferred, 51 requests
Info::
Page weighs 4.0 MB (2.1 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Warning::
JavaScript is 649 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 649 KB
Info::
51 HTTP requests
Info::
Estimated 0.45 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
51 requests
0.45 g CO2 per page load
Images 1.2 MiB 57%
JavaScript 649.3 KiB 30%
Fonts 199.3 KiB 9%
CSS 75.2 KiB 3%
HTML 10.9 KiB 1%
Other 3.1 KiB 0%
Other 548 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.1 MiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
6 scripts, 382 KB unused
FIX
6 scripts, 382 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 242 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.scielo.br/static/js/scielo-bundle-min....: 76 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-MKLV...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 382 KB
382 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB242 KB (67%)✓3rd
https://www.scielo.br/static/js/scielo-bundle-min.js127 KB76 KB (60%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-MKLVK7B5B6151 KB65 KB (43%)✓3rd
https://darkvisitors.com/tracker.js?project_key=c7366feb-7ba9-4f3d-a536-9bdca1bee1702 KB—✓3rd
https://static.scielo.org/js/cookiePolicy.min.js6 KB—✓3rd
https://www.google.com/recaptcha/api.js1 KB—✓3rd

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

D
Page Weight Inventory
Action
51 resources · 2.1 MB · 382 KB savings available
FIX
51 resources · 2.1 MB · 382 KB savings available
Warning::
Page weight 1.1 MB over 1MB target
Got: 2.1 MB Expected: ≤ 1 MB
Info::
~382 KB of savings available
Warning::
50 third-party resources (100% of weight)
Info::
3 resources over 200KB
51 resources · 2.1 MiB · 50 third-party 1.1 MiB over 1MB target
Image 57% · 1.2 MiB
JavaScript 30% · 649.3 KiB
Font 9% · 199.3 KiB
CSS 3% · 75.2 KiB
Document 1% · 11.3 KiB
Other 0% · 548 B

~382.3 KiB of savings available

Remove unused JavaScript: 382.3 KiB
C
Image Optimization
Action
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://licensebuttons.net/l/by/4.0/88x31.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.scielo.br/static/img/logo-capes.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.scielo.br/static/img/logo-bvs.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.scielo.br/static/img/logo-cnpq.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.scielo.br/static/img/logo-fap.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.scielo.br/static/img/logo-open-access.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.scielo.br/static/img/logo-fapesp.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.scielo.br/static/img/logo-bireme.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 1.2 MB
0 oversized -0 KB
31 legacy format
8 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

B
JS Execution Cost
687ms total JS execution
REVIEW
687ms total JS execution
Warning::
https://www.scielo.br/static/js/scielo-bundle-min....: 263ms CPU time
Info::
https://www.scielo.br/: 144ms CPU time
Info::
Unattributable: 138ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-MKLV...: 79ms CPU time
Info::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 63ms CPU time
Warning::
Third-party scripts: 687ms (100% of total)

Main Thread Breakdown

Other 30% Script Evaluation 28% Style & Layout 24% Script Parsing & Compilation 9% Rendering 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.scielo.br/static/js/scielo-bundle-min.js263ms92ms13ms3rd
https://www.scielo.br/144ms2ms1ms3rd
Unattributable138ms3ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MKLVK7B5B679ms62ms16ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js63ms32ms31ms3rd
B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
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
4 fonts (199 KB)
PASS
4 fonts (199 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

199 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.7 shttps://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2o-0bIpQlx3QUlC5A4PNB6Ry... https://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2 — 35.0 KiB — 12 ms — font-display: swaphttps://www.scielo.br/static/fonts/scielo-social-network.ttf?dhp6e8scielo-social-network.ttf https://www.scielo.br/static/fonts/scielo-social-network.ttf?dhp6e8 — 3.9 KiB — 19 ms — font-display: swaphttps://fonts.gstatic.com/s/materialiconsoutlined/v110/gok-H7zzDkdnRel8-DQ6KAXJ69wP1tGnf4ZGhUcel5euIg.woff2gok-H7zzDkdnRel8-DQ6KAX... https://fonts.gstatic.com/s/materialiconsoutlined/v110/gok-H7zzDkdnRel8-DQ6KAXJ69wP1tGnf4ZGhUcel5euIg.woff2 — 151.7 KiB — 19 ms — font-display: swaphttps://fonts.gstatic.com/s/arapey/v17/-W__XJn-UDDA2RCKYNodREEjew.woff2-W__XJn-UDDA2RCKYNodREE... https://fonts.gstatic.com/s/arapey/v17/-W__XJn-UDDA2RCKYNodREEjew.woff2 — 8.6 KiB — 15 ms — font-display: swap
o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 35 KB
Load time 12 ms
Start 429 ms
Risk FOUT — text flashes from fallback to web font
scielo-social-network.ttf ttf swap
Size 4 KB
Load time 19 ms
Start 429 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
gok-H7zzDkdnRel8-DQ6KAX... woff2 swap
Size 152 KB
Load time 19 ms
Start 430 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
-W__XJn-UDDA2RCKYNodREE... woff2 swap
Size 9 KB
Load time 15 ms
Start 430 ms
Risk FOUT — text flashes from fallback to web font
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 ~77 KB and ~154 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Hetzner Online GmbH

Network Waterfall
51 requests over 863ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.7 shttps://scielo.br// https://scielo.br/ — 301 — 325 B — 19 ms — h2https://www.scielo.br/www.scielo.br/ https://www.scielo.br/ — 200 — 10.9 KiB — 21 ms — h2https://www.scielo.br/static/css/bootstrap.css?v=1.1.23www.scielo.br/static/css/bootstrap.... https://www.scielo.br/static/css/bootstrap.css?v=1.1.23 — 200 — 68.5 KiB — 33 ms — h2https://www.googletagmanager.com/gtag/js?id=G-MKLVK7B5B6www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-MKLVK7B5B6 — 200 — 151.0 KiB — 289 ms — h2https://darkvisitors.com/tracker.js?project_key=c7366feb-7ba9-4f3d-a536-9bdca1bee170darkvisitors.com/tracker.js?project... https://darkvisitors.com/tracker.js?project_key=c7366feb-7ba9-4f3d-a536-9bdca1bee170 — 200 — 2.4 KiB — 248 ms — h2https://www.scielo.br/static/css/jquery.typeahead.csswww.scielo.br/static/css/jquery.typ... https://www.scielo.br/static/css/jquery.typeahead.css — 200 — 4.4 KiB — 5 ms — h2https://www.scielo.br/static/img/img-post-blog-scielo-exemplo.jpgwww.scielo.br/static/img/img-post-b... https://www.scielo.br/static/img/img-post-blog-scielo-exemplo.jpg — 200 — 189.6 KiB — 32 ms — h2https://www.scielo.br/static/js/scielo-bundle-min.jswww.scielo.br/static/js/scielo-bund... https://www.scielo.br/static/js/scielo-bundle-min.js — 200 — 126.7 KiB — 47 ms — h2https://static.scielo.org/js/cookiePolicy.min.jsstatic.scielo.org/js/cookiePolicy.m... https://static.scielo.org/js/cookiePolicy.min.js — 200 — 5.8 KiB — 133 ms — h2https://www.google.com/recaptcha/api.jswww.google.com/recaptcha/api.js https://www.google.com/recaptcha/api.js — 200 — 1012 B — 152 ms — h3https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/04/photo-1504701954957-2010ec3bcec1-300x225.jpgblog.scielo.org/en/wp-content/uploa... https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/04/photo-1504701954957-2010ec3bcec1-300x225.jpg — 200 — 4.4 KiB — 124 ms — h2https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/03/photo-1535391909-6b4eeb19f8bb-214x300.jpgblog.scielo.org/en/wp-content/uploa... https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/03/photo-1535391909-6b4eeb19f8bb-214x300.jpg — 200 — 6.9 KiB — 125 ms — h2https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/03/charlesdeluvio-Lks7vei-eAg-unsplash-300x200.jpgblog.scielo.org/en/wp-content/uploa... https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/03/charlesdeluvio-Lks7vei-eAg-unsplash-300x200.jpg — 200 — 20.7 KiB — 135 ms — h2https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/02/CR2603570_Crossref_Metadata_Sprint_Logo_V1_Primary_RGB_Location.ai_-300x180.jpgblog.scielo.org/en/wp-content/uploa... https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/02/CR2603570_Crossref_Metadata_Sprint_Logo_V1_Primary_RGB_Location.ai_-300x180.jpg — 200 — 10.0 KiB — 133 ms — h2https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/02/berke-citak-adrO5seSbBE-unsplash-200x300.jpgblog.scielo.org/en/wp-content/uploa... https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/02/berke-citak-adrO5seSbBE-unsplash-200x300.jpg — 200 — 18.8 KiB — 141 ms — h2https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/02/o-anel-de-giges1-200x300.jpgblog.scielo.org/en/wp-content/uploa... https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/02/o-anel-de-giges1-200x300.jpg — 200 — 4.3 KiB — 134 ms — h2https://licensebuttons.net/l/by/4.0/88x31.pnglicensebuttons.net/l/by/4.0/88x31.p... https://licensebuttons.net/l/by/4.0/88x31.png — 200 — 1.6 KiB — 76 ms — h2https://www.scielo.br/static/img/logo-capes.svgwww.scielo.br/static/img/logo-capes... https://www.scielo.br/static/img/logo-capes.svg — 200 — 228.6 KiB — 66 ms — h2https://www.scielo.br/static/img/logo-capes--dark.svgwww.scielo.br/static/img/logo-capes... https://www.scielo.br/static/img/logo-capes--dark.svg — 200 — 228.7 KiB — 74 ms — h2https://www.scielo.br/static/img/logo-cnpq.svgwww.scielo.br/static/img/logo-cnpq.... https://www.scielo.br/static/img/logo-cnpq.svg — 200 — 2.6 KiB — 66 ms — h2https://www.scielo.br/static/img/logo-cnpq--dark.svgwww.scielo.br/static/img/logo-cnpq-... https://www.scielo.br/static/img/logo-cnpq--dark.svg — 200 — 2.6 KiB — 66 ms — h2https://www.scielo.br/static/img/logo-fapesp.svgwww.scielo.br/static/img/logo-fapes... https://www.scielo.br/static/img/logo-fapesp.svg — 200 — 2.3 KiB — 66 ms — h2https://www.scielo.br/static/img/logo-fapesp--dark.svgwww.scielo.br/static/img/logo-fapes... https://www.scielo.br/static/img/logo-fapesp--dark.svg — 200 — 2.3 KiB — 66 ms — h2https://www.scielo.br/static/img/logo-bvs.svgwww.scielo.br/static/img/logo-bvs.s... https://www.scielo.br/static/img/logo-bvs.svg — 200 — 6.7 KiB — 66 ms — h2https://www.scielo.br/static/img/logo-bireme.svgwww.scielo.br/static/img/logo-birem... https://www.scielo.br/static/img/logo-bireme.svg — 200 — 16.7 KiB — 66 ms — h2https://www.scielo.br/static/img/logo-bireme--dark.svgwww.scielo.br/static/img/logo-birem... https://www.scielo.br/static/img/logo-bireme--dark.svg — 200 — 16.7 KiB — 65 ms — h2https://www.scielo.br/static/img/logo-fap.svgwww.scielo.br/static/img/logo-fap.s... https://www.scielo.br/static/img/logo-fap.svg — 200 — 184.9 KiB — 78 ms — h2https://www.scielo.br/static/img/logo-fap--dark.svgwww.scielo.br/static/img/logo-fap--... https://www.scielo.br/static/img/logo-fap--dark.svg — 200 — 188.8 KiB — 81 ms — h2https://www.scielo.br/media/images/CAPES.pngwww.scielo.br/media/images/CAPES.pn... https://www.scielo.br/media/images/CAPES.png — 200 — 6.7 KiB — 74 ms — h2https://www.scielo.br/media/images/CNPq.pngwww.scielo.br/media/images/CNPq.png https://www.scielo.br/media/images/CNPq.png — 200 — 8.4 KiB — 74 ms — h2
0 ms 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.7 shttps://scielo.br// https://scielo.br/ — 301 — 325 B — 19 ms — h2https://www.scielo.br/www.scielo.br/ https://www.scielo.br/ — 200 — 10.9 KiB — 21 ms — h2https://www.scielo.br/static/css/bootstrap.css?v=1.1.23www.scielo.br/static/css/bootstrap.... https://www.scielo.br/static/css/bootstrap.css?v=1.1.23 — 200 — 68.5 KiB — 33 ms — h2https://www.googletagmanager.com/gtag/js?id=G-MKLVK7B5B6www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-MKLVK7B5B6 — 200 — 151.0 KiB — 289 ms — h2https://darkvisitors.com/tracker.js?project_key=c7366feb-7ba9-4f3d-a536-9bdca1bee170darkvisitors.com/tracker.js?project... https://darkvisitors.com/tracker.js?project_key=c7366feb-7ba9-4f3d-a536-9bdca1bee170 — 200 — 2.4 KiB — 248 ms — h2https://www.scielo.br/static/css/jquery.typeahead.csswww.scielo.br/static/css/jquery.typ... https://www.scielo.br/static/css/jquery.typeahead.css — 200 — 4.4 KiB — 5 ms — h2https://www.scielo.br/static/img/img-post-blog-scielo-exemplo.jpgwww.scielo.br/static/img/img-post-b... https://www.scielo.br/static/img/img-post-blog-scielo-exemplo.jpg — 200 — 189.6 KiB — 32 ms — h2https://www.scielo.br/static/js/scielo-bundle-min.jswww.scielo.br/static/js/scielo-bund... https://www.scielo.br/static/js/scielo-bundle-min.js — 200 — 126.7 KiB — 47 ms — h2https://static.scielo.org/js/cookiePolicy.min.jsstatic.scielo.org/js/cookiePolicy.m... https://static.scielo.org/js/cookiePolicy.min.js — 200 — 5.8 KiB — 133 ms — h2https://www.google.com/recaptcha/api.jswww.google.com/recaptcha/api.js https://www.google.com/recaptcha/api.js — 200 — 1012 B — 152 ms — h3https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/04/photo-1504701954957-2010ec3bcec1-300x225.jpgblog.scielo.org/en/wp-content/uploa... https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/04/photo-1504701954957-2010ec3bcec1-300x225.jpg — 200 — 4.4 KiB — 124 ms — h2https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/03/photo-1535391909-6b4eeb19f8bb-214x300.jpgblog.scielo.org/en/wp-content/uploa... https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/03/photo-1535391909-6b4eeb19f8bb-214x300.jpg — 200 — 6.9 KiB — 125 ms — h2https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/03/charlesdeluvio-Lks7vei-eAg-unsplash-300x200.jpgblog.scielo.org/en/wp-content/uploa... https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/03/charlesdeluvio-Lks7vei-eAg-unsplash-300x200.jpg — 200 — 20.7 KiB — 135 ms — h2https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/02/CR2603570_Crossref_Metadata_Sprint_Logo_V1_Primary_RGB_Location.ai_-300x180.jpgblog.scielo.org/en/wp-content/uploa... https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/02/CR2603570_Crossref_Metadata_Sprint_Logo_V1_Primary_RGB_Location.ai_-300x180.jpg — 200 — 10.0 KiB — 133 ms — 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0 ms — datahttps://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2fonts.gstatic.com/s/notosans/v42/o-... https://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2 — 200 — 35.0 KiB — 12 ms — h3https://www.scielo.br/static/fonts/scielo-social-network.ttf?dhp6e8www.scielo.br/static/fonts/scielo-s... https://www.scielo.br/static/fonts/scielo-social-network.ttf?dhp6e8 — 200 — 3.9 KiB — 19 ms — h2https://fonts.gstatic.com/s/materialiconsoutlined/v110/gok-H7zzDkdnRel8-DQ6KAXJ69wP1tGnf4ZGhUcel5euIg.woff2fonts.gstatic.com/s/materialiconsou... https://fonts.gstatic.com/s/materialiconsoutlined/v110/gok-H7zzDkdnRel8-DQ6KAXJ69wP1tGnf4ZGhUcel5euIg.woff2 — 200 — 151.7 KiB — 19 ms — h3https://fonts.gstatic.com/s/arapey/v17/-W__XJn-UDDA2RCKYNodREEjew.woff2fonts.gstatic.com/s/arapey/v17/-W__... https://fonts.gstatic.com/s/arapey/v17/-W__XJn-UDDA2RCKYNodREEjew.woff2 — 200 — 8.6 KiB — 15 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 687ms · 651KB · R$8/mo
www.scielo.br
Other
Costly
Execution 263ms
Transfer 127 KB
Unused 60%
Monthly Cost R$3/mo
www.scielo.br
Other
Optional
Execution 144ms
Transfer 11 KB
Monthly Cost R$2/mo
Unattributable
Other
Optional
Execution 138ms
Transfer 0 KB
Monthly Cost R$2/mo
Google Tag Manager
Tag Manager
Optional
Execution 79ms
Transfer 151 KB
Unused 43%
Monthly Cost R$1/mo
www.gstatic.com
Other
Optional
Execution 63ms
Transfer 362 KB
Unused 67%
Monthly Cost R$1/mo

These scripts may cost more than they're worth

  • www.scielo.br adds 263ms and costs ~R$3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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.scielo.br takes 263ms 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

60% of www.scielo.br's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

67% of www.gstatic.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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