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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
5
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.
100
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.

9.39 s

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

19.26 s

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

1.67 s

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

1.404

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

9.39 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.

19.27 s

Page Load Progression

571 ms
1.1 s
1.7 s
2.3 s
2.9 s
3.4 s
4.0 s
4.6 s
Checks
17
7 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 110 requests
FIX
2.9 MB transferred, 110 requests
Warning::
Page weighs 7.8 MB (2.9 MB transferred)
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Warning::
Images are 1.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.0 MB
Info::
CSS is 272 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 272 KB
Warning::
110 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.60 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
110 requests
0.60 g CO2 per page load
JavaScript 1.3 MiB 46%
Images 1.0 MiB 36%
CSS 272.4 KiB 9%
Fonts 160.5 KiB 5%
HTML 76.1 KiB 3%
Other 16.9 KiB 1%
Other 8.3 KiB 0%
Other 1.2 KiB 0%
Other 544 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

F
JS Execution Cost
Action
6045ms total JS execution
FIX
6045ms total JS execution
Warning::
https://uchile.cl/: 1686ms CPU time
Warning::
Unattributable: 1005ms CPU time
Warning::
https://uchile.cl/.resources/portal-uchile/scripts...: 961ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7H6G...: 906ms CPU time
Warning::
https://uchile.cl/.resources/uchile-recursos/no-ed...: 465ms CPU time
Info::
Third-party scripts: 2744ms (45% of total)

Main Thread Breakdown

Script Evaluation 40% Other 25% Style & Layout 20% Parse HTML & CSS 5% Script Parsing & Compilation 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://uchile.cl/1686ms12ms4ms1st
Unattributable1005ms19ms0ms3rd
https://uchile.cl/.resources/portal-uchile/scripts/vendor.js961ms733ms58ms1st
https://www.googletagmanager.com/gtag/js?id=G-7H6GPTHG93906ms584ms93ms3rd
https://uchile.cl/.resources/uchile-recursos/no-editor2.js465ms462ms1ms1st
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js320ms258ms56ms3rd
https://www.google.com/cse/static/element/b33cba5881f68fbf/cse_element__nl.js?usqp=CAI%3D264ms156ms53ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js124ms94ms25ms3rd
https://uchile.cl/.resources/portal-uchile/scripts/main31.js118ms108ms6ms1st
https://uchile.cl/.resources/portal-uchile/styles/main11.css71ms0ms0ms1st

Showing top 10 of 12 scripts

D
Page Weight Inventory
Action
110 resources · 2.9 MB · 280 KB savings available
FIX
110 resources · 2.9 MB · 280 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~280 KB of savings available
Warning::
47 third-party resources (53% of weight)
Info::
1 resources over 200KB
110 resources · 2.9 MiB · 47 third-party 1.9 MiB over 1MB target
JavaScript 46% · 1.3 MiB
Image 37% · 1.1 MiB
CSS 9% · 272.4 KiB
Font 5% · 160.5 KiB
Document 3% · 76.1 KiB
Other 0% · 9.4 KiB

~279.9 KiB of savings available

Remove unused JavaScript: 279.9 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Third-Party Impact
53% third-party, 0 ms blocking
REVIEW
53% third-party, 0 ms blocking
Warning::
Third-party code accounts for 53% of page weight (1.5 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
47%
53%
First-party Third-party
B
Image Optimization
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Info::
All images are well-optimized
44 images 1.0 MB
0 oversized -0 KB
29 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
20 scripts, 280 KB unused
REVIEW
20 scripts, 280 KB unused
Warning::
https://uchile.cl/.resources/portal-uchile/scripts...: 74 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7H6G...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.google.com/cse/static/element/b33cba58...: 49 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 38 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cse.google.com/adsense/search/async-ads.js: 32 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 280 KB
280 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://uchile.cl/.resources/portal-uchile/scripts/vendor.js104 KB74 KB (72%)✓1st
https://www.googletagmanager.com/gtag/js?id=G-7H6GPTHG93158 KB65 KB (41%)✓3rd
https://www.google.com/cse/static/element/b33cba5881f68fbf/cse_element__nl.js?usqp=CAI%3D99 KB49 KB (49%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://cse.google.com/adsense/search/async-ads.js44 KB32 KB (73%)✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js31 KB23 KB (75%)✓3rd
https://www.google.com/js/th/cN4AN9hxcU4NRvji1RMUfz3eri06TDMd9Q_fvSbDV9Q.js23 KB—✓3rd
https://uchile.cl/.resources/portal-uchile/scripts/jquery.fancybox.min.js22 KB—✓1st
https://static.doubleclick.net/instream/ad_status.js0 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=r78Drb183 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

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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
6 fonts (160 KB)
PASS
6 fonts (160 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

160 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 9.4 s LCP 19.3 shttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 27 ms — font-display: swaphttps://fonts.gstatic.com/s/raleway/v37/1Ptug8zYS_SKggPNyC0IT4ttDfA.woff21Ptug8zYS_SKggPNyC0IT4t... https://fonts.gstatic.com/s/raleway/v37/1Ptug8zYS_SKggPNyC0IT4ttDfA.woff2 — 42.1 KiB — 13 ms — font-display: swaphttps://fonts.gstatic.com/s/ptsans/v18/jizaRExUiTo99u79D0KExcOPIDU.woff2jizaRExUiTo99u79D0KExcO... https://fonts.gstatic.com/s/ptsans/v18/jizaRExUiTo99u79D0KExcOPIDU.woff2 — 11.2 KiB — 19 ms — font-display: swaphttps://uchile.cl/.resources/portal-uchile/fonts/icomoon.ttf?bankv3icomoon.ttf https://uchile.cl/.resources/portal-uchile/fonts/icomoon.ttf?bankv3 — 33.1 KiB — 506 ms — font-display: swaphttps://fonts.gstatic.com/s/ptsans/v18/jizfRExUiTo99u79B_mh0O6tLR8a8zI.woff2jizfRExUiTo99u79B_mh0O6... https://fonts.gstatic.com/s/ptsans/v18/jizfRExUiTo99u79B_mh0O6tLR8a8zI.woff2 — 11.4 KiB — 28 ms — font-display: swaphttps://uchile.cl/.resources/portal-uchile/fonts/icomoon.woff?bankv3icomoon.woff https://uchile.cl/.resources/portal-uchile/fonts/icomoon.woff?bankv3 — 28.7 KiB — 573 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 27 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
1Ptug8zYS_SKggPNyC0IT4t... woff2 swap
Size 42 KB
Load time 13 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
jizaRExUiTo99u79D0KExcO... woff2 swap
Size 11 KB
Load time 19 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
icomoon.ttf ttf swap
Size 33 KB
Load time 506 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
jizfRExUiTo99u79B_mh0O6... woff2 swap
Size 11 KB
Load time 28 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
icomoon.woff woff swap
Size 29 KB
Load time 573 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~19 KB and ~38 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
110 requests over 5749ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 9.4 s LCP 19.3 shttps://uchile.cl// https://uchile.cl/ — 200 — 14.7 KiB — 1.2 s — http/1.1https://www.googletagmanager.com/gtag/js?id=G-7H6GPTHG93www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-7H6GPTHG93 — 200 — 157.8 KiB — 84 ms — h2https://fonts.googleapis.com/css2?family=PT+Sans:ital,wght@0,400;0,700;1,400;1,700&family=Raleway:ital,wght@0,100..900;1,100..900&display=swapfonts.googleapis.com/css2?family=PT... https://fonts.googleapis.com/css2?family=PT+Sans:ital,wght@0,400;0,700;1,400;1,700&family=Raleway:ital,wght@0,100..900;1,100..900&display=swap — 200 — 1.3 KiB — 60 ms — h2https://uchile.cl/.resources/portal-uchile/styles/swiper-bundle.min.css/.resources/portal-uchile/styles/sw... https://uchile.cl/.resources/portal-uchile/styles/swiper-bundle.min.css — 200 — 5.0 KiB — 231 ms — http/1.1https://uchile.cl/.resources/portal-uchile/styles/jquery.fancybox.min.css/.resources/portal-uchile/styles/jq... https://uchile.cl/.resources/portal-uchile/styles/jquery.fancybox.min.css — 200 — 3.7 KiB — 228 ms — http/1.1https://uchile.cl/.resources/portal-uchile/styles/main11.css/.resources/portal-uchile/styles/ma... https://uchile.cl/.resources/portal-uchile/styles/main11.css — 200 — 32.6 KiB — 866 ms — http/1.1https://uchile.cl/.resources/portal-uchile/styles/subportada-a.css/.resources/portal-uchile/styles/su... https://uchile.cl/.resources/portal-uchile/styles/subportada-a.css — 200 — 7.4 KiB — 447 ms — http/1.1https://uchile.cl/.resources/portal-uchile/styles/subportada-b4.css/.resources/portal-uchile/styles/su... https://uchile.cl/.resources/portal-uchile/styles/subportada-b4.css — 200 — 13.5 KiB — 842 ms — http/1.1https://uchile.cl/.resources/portal-uchile/styles/subportada-d.css/.resources/portal-uchile/styles/su... https://uchile.cl/.resources/portal-uchile/styles/subportada-d.css — 200 — 3.2 KiB — 639 ms — http/1.1https://uchile.cl/.resources/portal-uchile/styles/subportada-e19.css/.resources/portal-uchile/styles/su... https://uchile.cl/.resources/portal-uchile/styles/subportada-e19.css — 200 — 17.4 KiB — 847 ms — http/1.1https://uchile.cl/.resources/portal-uchile/styles/subportada-f32.css/.resources/portal-uchile/styles/su... https://uchile.cl/.resources/portal-uchile/styles/subportada-f32.css — 200 — 3.2 KiB — 641 ms — http/1.1https://uchile.cl/.resources/portal-uchile/styles/subportada-g8.css/.resources/portal-uchile/styles/su... https://uchile.cl/.resources/portal-uchile/styles/subportada-g8.css — 200 — 20.3 KiB — 867 ms — http/1.1https://uchile.cl/.resources/portal-uchile/styles/subportada-h07.css/.resources/portal-uchile/styles/su... https://uchile.cl/.resources/portal-uchile/styles/subportada-h07.css — 200 — 13.7 KiB — 865 ms — http/1.1https://uchile.cl/.resources/portal-uchile/styles/subportada-i16.css/.resources/portal-uchile/styles/su... https://uchile.cl/.resources/portal-uchile/styles/subportada-i16.css — 200 — 6.1 KiB — 871 ms — http/1.1https://uchile.cl/.resources/portal-uchile/styles/subportada-especiales09.css/.resources/portal-uchile/styles/su... https://uchile.cl/.resources/portal-uchile/styles/subportada-especiales09.css — 200 — 11.5 KiB — 1.1 s — http/1.1https://uchile.cl/.resources/portal-uchile/styles/subportada-noticias5.css/.resources/portal-uchile/styles/su... https://uchile.cl/.resources/portal-uchile/styles/subportada-noticias5.css — 200 — 3.3 KiB — 1.1 s — http/1.1https://uchile.cl/.resources/portal-uchile/styles/portada17.css/.resources/portal-uchile/styles/po... https://uchile.cl/.resources/portal-uchile/styles/portada17.css — 200 — 7.7 KiB — 1.1 s — http/1.1https://uchile.cl/.resources/uchile-recursos/addthis.css/.resources/uchile-recursos/addthis... https://uchile.cl/.resources/uchile-recursos/addthis.css — 200 — 1.3 KiB — 1.1 s — http/1.1https://uchile.cl/.resources/uchile-recursos/no-editor.css/.resources/uchile-recursos/no-edit... https://uchile.cl/.resources/uchile-recursos/no-editor.css — 200 — 1.1 KiB — 1.1 s — http/1.1https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js — 200 — 30.9 KiB — 55 ms — h2https://cse.google.com/cse.js?cx=7e34272bb3c2dfb1dcse.google.com/cse.js?cx=7e34272bb3... https://cse.google.com/cse.js?cx=7e34272bb3c2dfb1d — 200 — 3.1 KiB — 71 ms — h2https://static.hotjar.com/c/hotjar-6465138.js?sv=6static.hotjar.com/c/hotjar-6465138.... https://static.hotjar.com/c/hotjar-6465138.js?sv=6 — 200 — 6.2 KiB — 47 ms — h2https://www.youtube.com/embed/FEqBgUOd4Cowww.youtube.com/embed/FEqBgUOd4Co https://www.youtube.com/embed/FEqBgUOd4Co — 200 — 55.7 KiB — 125 ms — h2https://script.hotjar.com/modules.6a0f3932cb1341a35c18.jsscript.hotjar.com/modules.6a0f3932c... https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js — 200 — 56.6 KiB — 55 ms — h2https://www.google.com/cse/static/element/b33cba5881f68fbf/cse_element__nl.js?usqp=CAI%3Dwww.google.com/cse/static/element/b... https://www.google.com/cse/static/element/b33cba5881f68fbf/cse_element__nl.js?usqp=CAI%3D — 200 — 98.6 KiB — 52 ms — h3https://www.google.com/cse/static/element/b33cba5881f68fbf/default_v6+nl.csswww.google.com/cse/static/element/b... https://www.google.com/cse/static/element/b33cba5881f68fbf/default_v6+nl.css — 200 — 9.7 KiB — 33 ms — h3https://www.google.com/cse/static/style/look/v6/default.csswww.google.com/cse/static/style/loo... https://www.google.com/cse/static/style/look/v6/default.css — 200 — 1.2 KiB — 20 ms — h3https://www.youtube.com/s/player/1bb6ee63/www-player.csswww.youtube.com/s/player/1bb6ee63/w... https://www.youtube.com/s/player/1bb6ee63/www-player.css — 200 — 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https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=afs_1234567890&jk=mg1t2iU0RFmO7Z4Q%2BxALyg%3D%3D&bg=!zs2lza_NAAa1ilLUlYo7AEcBe5WfOC3cKAJELzFUNzDxQSvfGT26-dePwiRsHp3vTmqu8gAbreOhH5K8lhiFjY6CepD693urt9zshbQFH-ByJnB2eSDOWAIAAABkUgAAAAVoAQd-ABuw8mF7kLjmMrbd8l1cHgg9yVXdieXxQgLHRMWZAf3yaKlpcIt73iUOGZ6Hfra18TrtaNrkZvz1_oUyuiH6YlAIH5e-YkpYHVS5Z0pTNmCefc_L-oU_h_9iB2WKqrTj0rbnmx-Duk77nLVAGntQ19BbVE7xnZvzaAzKLJC3Y8sY6eCgxaZITfCCUTyf0ZtJkvDAE9khu5t6pcZyEZkCNdtD-GKtf9ZPT5t_-Pa06y8ZuiuKaCyvVckHyCw59CSW2ixf4lWr6VjWchyrlmJk222-XWw-Qit_mJiYKyuGRpOJMrKRBg29oZ4pOfihFbuzLkWUZQC75SoII1NmQALs9PeyGCvgQLS2GvZHnEDiun8JMlv8tJTa30Owd90It4oMxQehZJZ24GW210GaJvlOKBP9QvqxRiYoI7ypwjr29wHGnzsnbUfvNF2jqicnL4aNeiRRJT1C0FxNKwUluUUx5kDgKWvBE5qOHmtyaq0j8xo22dDrxo2jnhtIaIsHJQjzNfdwiDZAq1kIzEYlTBEUvH5F6-rjtRr6Psmt7RusWnKEBLVs0NquBLNL9bekBTw1nGyb9ETi2ODp4NMS4IoaU0E4Dj3i0gXTZCOby_8AluxfKahX55CvmxZB8UsZWa2dXOU3j1usZ7mCgJctH08SJb1q1nG2joMT5jyYqjdLqJggp6aedX7TrkooS6Z_lTGQMVLktDpOHtzrJ4ikDQ — 204 — 17 B — 16 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
45% of JavaScript execution is third-party
First-party Third-party 2744ms · 395KB · CL$20313/mo
Unattributable
Other
Costly
Execution 1005ms
Transfer 0 KB
Monthly Cost CL$7437/mo
Google Tag Manager
Tag Manager
Costly
Execution 906ms
Transfer 158 KB
Unused 41%
Monthly Cost CL$6704/mo
Hotjar
Session Replay
Costly
Execution 320ms
Transfer 57 KB
Unused 67%
Monthly Cost CL$2365/mo
www.google.com
Other
Costly
Execution 264ms
Transfer 99 KB
Unused 49%
Monthly Cost CL$1953/mo
ajax.googleapis.com
Other
Costly
Execution 124ms
Transfer 31 KB
Unused 75%
Monthly Cost CL$917/mo
cse.google.com
Other
Costly
Execution 69ms
Transfer 44 KB
Unused 73%
Monthly Cost CL$508/mo
ep2.adtrafficquality.google
Other
Costly
Execution 58ms
Transfer 8 KB
Monthly Cost CL$427/mo

These scripts may cost more than they're worth

  • Unattributable adds 1005ms and costs ~CL$7437/month
  • Google Tag Manager adds 906ms and costs ~CL$6704/month
  • Hotjar adds 320ms and costs ~CL$2365/month
  • www.google.com adds 264ms and costs ~CL$1953/month
  • ajax.googleapis.com adds 124ms and costs ~CL$917/month
  • cse.google.com adds 69ms and costs ~CL$508/month
  • ep2.adtrafficquality.google adds 58ms and costs ~CL$427/month

45% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 1005ms 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

Google Tag Manager takes 906ms 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

Hotjar takes 320ms 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

67% of Hotjar'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

www.google.com takes 264ms 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

ajax.googleapis.com takes 124ms 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

75% of ajax.googleapis.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

cse.google.com takes 69ms 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

73% of cse.google.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

ep2.adtrafficquality.google takes 58ms 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

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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