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https://unam.mx

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
3
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
21
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

2.82 s

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

17.88 s

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

1.22 s

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

0.562

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

4.84 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.

18.00 s

Page Load Progression

600 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
17
8 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
3.9 MB transferred, 97 requests
FIX
3.9 MB transferred, 97 requests
Warning::
Page weighs 8.2 MB (3.9 MB transferred)
Warning::
Images are 2.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.1 MB
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Info::
97 HTTP requests
Info::
Estimated 0.81 g CO2 per page load
3.9 MB / 2.4 MB budget
3.9 MB transferred
97 requests
0.81 g CO2 per page load
Images 2.1 MiB 54%
JavaScript 1.4 MiB 36%
HTML 178.5 KiB 4%
CSS 147.5 KiB 4%
Fonts 68.6 KiB 2%
Other 9.8 KiB 0%
Other 1.8 KiB 0%
Other 1.5 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

F
JS Execution Cost
Action
7995ms total JS execution
FIX
7995ms total JS execution
Warning::
https://www.unam.mx/: 3087ms CPU time
Warning::
Unattributable: 1197ms CPU time
Warning::
https://ajax.googleapis.com/ajax/libs/jquery/1.8.3...: 963ms CPU time
Warning::
https://www.unam.mx/cdn-cgi/challenge-platform/scr...: 527ms CPU time
Warning::
https://platform.twitter.com/widgets.js: 526ms CPU time
Warning::
Third-party scripts: 4331ms (54% of total)

Main Thread Breakdown

Script Evaluation 39% Other 25% Rendering 15% Style & Layout 12% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.unam.mx/3087ms115ms8ms1st
Unattributable1197ms160ms0ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js963ms785ms15ms3rd
https://www.unam.mx/cdn-cgi/challenge-platform/scripts/jsd/main.js527ms504ms4ms1st
https://platform.twitter.com/widgets.js526ms361ms99ms3rd
https://www.googletagmanager.com/gtag/js?id=G-R800EXT5K9&cx=c&_slc=1432ms294ms135ms3rd
https://connect.facebook.net/es_LA/bundle/sdk.js/357ms300ms47ms3rd
https://cse.google.com/cse.js?cx=000862918480106004188:wi2hxgsc9de206ms164ms1ms3rd
https://www.google-analytics.com/analytics.js148ms122ms17ms3rd
https://ajax.googleapis.com/ajax/libs/jqueryui/1.10.2/jquery-ui.min.js116ms62ms40ms3rd

Showing top 10 of 15 scripts

D
Page Weight Inventory
Action
97 resources · 3.9 MB · 278 KB savings available
FIX
97 resources · 3.9 MB · 278 KB savings available
Warning::
Page weight 2.9 MB over 1MB target
Got: 3.9 MB Expected: ≤ 1 MB
Info::
~278 KB of savings available
Warning::
53 third-party resources (45% of weight)
Info::
3 resources over 200KB
97 resources · 3.9 MiB · 53 third-party 2.9 MiB over 1MB target
Image 54% · 2.1 MiB
JavaScript 36% · 1.4 MiB
Document 4% · 178.7 KiB
CSS 4% · 147.5 KiB
Font 2% · 68.6 KiB
Other 0% · 12.4 KiB

~278.4 KiB of savings available

Remove unused JavaScript: 278.4 KiB
B
Third-Party Impact
45% third-party, 0 ms blocking
REVIEW
45% third-party, 0 ms blocking
Info::
Third-party code accounts for 45% of page weight (1.7 MiB of 3.9 MiB)
Info::
Third-party blocking time is low (0 ms)
55%
45%
First-party Third-party
C
Image Optimization
Action
38 images, 0 KB saveable
REVIEW
38 images, 0 KB saveable
Warning::
https://www.unam.mx/sites/all/themes/unam/logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.unam.mx/sites/default/files/images/soc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.unam.mx/sites/default/files/images/soc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.unam.mx/sites/default/files/images/soc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
38 images 2.1 MB
0 oversized -0 KB
13 legacy format
4 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

C
JS Bundles
Action
25 scripts, 278 KB unused
REVIEW
25 scripts, 278 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-R800...: 67 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.google.com/cse/static/element/dc329f57...: 53 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ajax.googleapis.com/ajax/libs/jqueryui/1.1...: 52 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/es_LA/bundle/sdk.js/: 51 KB unused (66%)
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: 278 KB
278 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-R800EXT5K9&cx=c&_slc=1160 KB67 KB (42%)✓3rd
https://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__es.js?usqp=CAM%3D103 KB53 KB (51%)✓3rd
https://ajax.googleapis.com/ajax/libs/jqueryui/1.10.2/jquery-ui.min.js60 KB52 KB (88%)✓3rd
https://connect.facebook.net/es_LA/bundle/sdk.js/78 KB51 KB (66%)✓3rd
https://cse.google.com/adsense/search/async-ads.js44 KB32 KB (73%)✓3rd
https://platform.twitter.com/widgets.js27 KB25 KB (99%)✓3rd
https://www.youtube.com/s/player/218d9d92/player_embed_es6.vflset/en_US/base.js436 KB—✓3rd
https://www.unam.mx/sites/default/files/js/js_SpbJAG1Bu1guk20fiA-z1XncJHF44Bldqcs7iAh1XLM.js4 KB—✓1st
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://www.google-analytics.com/analytics.js21 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
2 fonts (69 KB)
PASS
2 fonts (69 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

69 KB total

Render-blocking

0

of 2

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 FCP 2.8 s LCP 17.9 shttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 28 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBHMdazTgWw.woff2 — 34.7 KiB — 9 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 28 ms
Start 794 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 35 KB
Load time 9 ms
Start 1.8 s
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)
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+
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
A+
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: public, max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
Last-Modified header present
Cache-Control

public, max-age=3600

DirectiveValueMeaning
public—Any cache may store this response
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
97 requests over 2808ms
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 FCP 2.8 s LCP 17.9 shttps://www.unam.mx// https://www.unam.mx/ — 200 — 12.6 KiB — 371 ms — h3https://www.unam.mx/cdn-cgi/speculation/cdn-cgi/speculation https://www.unam.mx/cdn-cgi/speculation — 200 — 929 B — 7 ms — h3https://www.unam.mx/sites/default/files/css/css_lQaZfjVpwP_oGNqdtWCSpJT1EMqXdMiU84ekLLxQnc4.css/sites/default/files/css/css_lQaZfj... https://www.unam.mx/sites/default/files/css/css_lQaZfjVpwP_oGNqdtWCSpJT1EMqXdMiU84ekLLxQnc4.css — 200 — 1.3 KiB — 18 ms — h3https://www.unam.mx/sites/default/files/css/css_Q7R7Blo9EYqLDI5rIlO_T3uTFBjIXjLpcqMHjTvVdmg.css/sites/default/files/css/css_Q7R7Bl... https://www.unam.mx/sites/default/files/css/css_Q7R7Blo9EYqLDI5rIlO_T3uTFBjIXjLpcqMHjTvVdmg.css — 200 — 2.9 KiB — 24 ms — h3https://www.unam.mx/sites/default/files/css/css_dWBHPbSQWh-19e3Bc29cTHIsefj--RoEVftmVdOAMn4.css/sites/default/files/css/css_dWBHPb... https://www.unam.mx/sites/default/files/css/css_dWBHPbSQWh-19e3Bc29cTHIsefj--RoEVftmVdOAMn4.css — 200 — 2.6 KiB — 33 ms — h3https://www.unam.mx/sites/default/files/css/css_JLCP4n47Z8AISwIm1s1TnuIbTc65IkfQsjfJ5oINFyo.css/sites/default/files/css/css_JLCP4n... https://www.unam.mx/sites/default/files/css/css_JLCP4n47Z8AISwIm1s1TnuIbTc65IkfQsjfJ5oINFyo.css — 200 — 8.5 KiB — 37 ms — h3https://www.unam.mx/sites/default/files/css/css_uc1RcvZeZUNveo7aHETNpsDro7gPbqp5Tzst0CqeGDQ.css/sites/default/files/css/css_uc1Rcv... https://www.unam.mx/sites/default/files/css/css_uc1RcvZeZUNveo7aHETNpsDro7gPbqp5Tzst0CqeGDQ.css — 200 — 15.2 KiB — 42 ms — h3https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js — 200 — 32.9 KiB — 77 ms — h2https://www.unam.mx/sites/default/files/js/js_dWhBODswdXXk1M5Z5nyqNfGljmqwxUwAK9i6D0YSDNs.js/sites/default/files/js/js_dWhBODsw... https://www.unam.mx/sites/default/files/js/js_dWhBODswdXXk1M5Z5nyqNfGljmqwxUwAK9i6D0YSDNs.js — 200 — 8.9 KiB — 52 ms — h3https://ajax.googleapis.com/ajax/libs/jqueryui/1.10.2/jquery-ui.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jqueryui/1.10.2/jquery-ui.min.js — 200 — 59.9 KiB — 76 ms — h2https://www.unam.mx/sites/default/files/js/js_o0NmOA6FrOQamIKXP181IN2QejpF72PVBGsbUlh8LeY.js/sites/default/files/js/js_o0NmOA6F... https://www.unam.mx/sites/default/files/js/js_o0NmOA6FrOQamIKXP181IN2QejpF72PVBGsbUlh8LeY.js — 200 — 1.1 KiB — 52 ms — h3https://www.unam.mx/sites/default/files/js/js_xVdESRffMtg-VD1YEgI9Mt1hde2nAMJ-UvxnP-vdHvQ.js/sites/default/files/js/js_xVdESRff... https://www.unam.mx/sites/default/files/js/js_xVdESRffMtg-VD1YEgI9Mt1hde2nAMJ-UvxnP-vdHvQ.js — 200 — 6.7 KiB — 57 ms — h3https://www.unam.mx/sites/default/files/js/js_SpbJAG1Bu1guk20fiA-z1XncJHF44Bldqcs7iAh1XLM.js/sites/default/files/js/js_SpbJAG1B... https://www.unam.mx/sites/default/files/js/js_SpbJAG1Bu1guk20fiA-z1XncJHF44Bldqcs7iAh1XLM.js — 200 — 3.8 KiB — 49 ms — h3https://www.unam.mx/sites/all/themes/unam/logo.png/sites/all/themes/unam/logo.png https://www.unam.mx/sites/all/themes/unam/logo.png — 200 — 6.2 KiB — 58 ms — h3https://www.unam.mx/sites/default/files/images/carrusel/260420-portada-gaceta-unam-web.jpg/sites/default/files/images/carruse... https://www.unam.mx/sites/default/files/images/carrusel/260420-portada-gaceta-unam-web.jpg — 200 — 129.8 KiB — 58 ms — h3https://www.unam.mx/sites/default/files/images/carrusel/banner-8m-2026.jpg/sites/default/files/images/carruse... https://www.unam.mx/sites/default/files/images/carrusel/banner-8m-2026.jpg — 200 — 48.9 KiB — 22 ms — h3https://www.unam.mx/sites/default/files/images/carrusel/banneranimado-ok.gif/sites/default/files/images/carruse... https://www.unam.mx/sites/default/files/images/carrusel/banneranimado-ok.gif — 200 — 1.3 MiB — 79 ms — h3https://www.unam.mx/sites/default/files/images/carrusel/banner-1960x600-becas-ok.jpg.jpeg/sites/default/files/images/carruse... https://www.unam.mx/sites/default/files/images/carrusel/banner-1960x600-becas-ok.jpg.jpeg — 200 — 128.1 KiB — 34 ms — h3https://www.unam.mx/sites/default/files/js/js_rR1UpFcxYbve0531qs7TKMKfw50KNIliTDdxenDPsUI.js/sites/default/files/js/js_rR1UpFcx... https://www.unam.mx/sites/default/files/js/js_rR1UpFcxYbve0531qs7TKMKfw50KNIliTDdxenDPsUI.js — 200 — 18.9 KiB — 62 ms — h3https://www.unam.mx/sites/default/files/images/carrusel/500-historias-1960x600.jpg/sites/default/files/images/carruse... https://www.unam.mx/sites/default/files/images/carrusel/500-historias-1960x600.jpg — 200 — 111.2 KiB — 79 ms — h3https://www.unam.mx/sites/default/files/images/boletines/2351.jpg/sites/default/files/images/boletin... https://www.unam.mx/sites/default/files/images/boletines/2351.jpg — 200 — 18.5 KiB — 61 ms — h3https://www.unam.mx/sites/default/files/images/boletines/2341.jpg/sites/default/files/images/boletin... https://www.unam.mx/sites/default/files/images/boletines/2341.jpg — 200 — 24.4 KiB — 94 ms — h3https://www.unam.mx/sites/default/files/images/eventos/informe2025.jpg/sites/default/files/images/eventos... https://www.unam.mx/sites/default/files/images/eventos/informe2025.jpg — 200 — 15.8 KiB — 679 ms — h3https://www.unam.mx/sites/default/files/images/eventos/pt-2026.jpg/sites/default/files/images/eventos... https://www.unam.mx/sites/default/files/images/eventos/pt-2026.jpg — 200 — 21.0 KiB — 77 ms — h3https://www.unam.mx/sites/default/files/images/eventos/300.gif/sites/default/files/images/eventos... https://www.unam.mx/sites/default/files/images/eventos/300.gif — 200 — 230.8 KiB — 182 ms — h3https://www.unam.mx/sites/default/files/images/gaceta/lunes_20_abril_2026_gaceta_unam_portal.jpg/sites/default/files/images/gaceta/... https://www.unam.mx/sites/default/files/images/gaceta/lunes_20_abril_2026_gaceta_unam_portal.jpg — 200 — 25.9 KiB — 93 ms — h3https://platform.twitter.com/widgets.jsplatform.twitter.com/widgets.js https://platform.twitter.com/widgets.js — 200 — 27.3 KiB — 115 ms — h2https://www.unam.mx/sites/default/files/images/campanias/llvr.jpg/sites/default/files/images/campani... https://www.unam.mx/sites/default/files/images/campanias/llvr.jpg — 200 — 10.8 KiB — 86 ms — h3https://www.unam.mx/sites/default/files/images/campanias/cigu-abajo.jpg/sites/default/files/images/campani... https://www.unam.mx/sites/default/files/images/campanias/cigu-abajo.jpg — 200 — 6.2 KiB — 121 ms — h3https://www.unam.mx/sites/default/files/images/campanias/ptu.jpg/sites/default/files/images/campani... https://www.unam.mx/sites/default/files/images/campanias/ptu.jpg — 200 — 8.1 KiB — 112 ms — h3
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https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=afs_1234567890&jk=Otb%2F%2BkwLSi2ybYP6wEUlfg%3D%3D&bg=!xsWlxafNAAY2C5OeFgs7AEcBe5WfODquvV0yqte0le4PtjhnEfFr77i0B0NWAnOWYAPRsDtIbVreZqDwg7g1ivVnCyOlPiI8XPtiqI-o-OBOjK0dtGzE4wIAAAD9UgAAAAtoAQd-ABuTOiqBcQBvle5HaHhX3ahhdAG5ZH6xM87qn2cKATq0iwOG9PwHWMEqt0q7KDBXZdnT386e3lzddK78mSf3FnEqHSeyTDyAl2Ic_ql_tT3w5oBgLtfizcBuWMc0r2GTAznzV6NC0dfhiWuYfgjC7xHPukbZPuHtcsbl6U6i_X21LFHEvBGowJg6HugieYvlccCo3hxYztZlY6ei00cRIpuq6Ju4qLCtrz3u2HWyTLdLCrlwOdQN0BDustzks67tRjzzwMtj1BjRUeUvQpyKrqwNFPwFuZrFI7SXVABx872auOeFpYFzpuHUQExyIQF4UZGvn97-vAZgFPxsMawPOgKGTC49vSGBSqj6nqXMDwxJNG49sGgFVCzOOCKedurUZok7lg7H9PllYaGFnNEu-KhCTLrVux66afMVrXhMuBlf-bdMnBrrVhBiBNZv9q0gh8-Iis-LqA5b45kCBravTJEGbgBcPJEDGApB652kaxiC_MGl60EyZVCeHUnQC0YRBD5Q9HGVtSX8PUiwK2nLHP0xkisl0U05UGg4Jp1-zxPtakaRYV_HIUh0GMqLQMJN-AU-ga3gIchglTylwuj2Bno5nE9jmX4Il9EnvRnBmai_c6aHonsIHfu66iJYEVRgJuRGDwz0ebGJCn268EhiHXTMtsc-RQ9Krz8xPOqxNPLUfgeF7hFdHw0MSnC3IjSVuJZXYc7SK-Qt5V3X1VeQrKKf1IVBjMCG7mv1Q5VeyOcy_STK917qX9TzQknJK4g2QtCYEENrU4hN4sEuY9PSaiDCN7NbiXKYoSh7MFT7gkVo87VW_NhobMZMGRY6t0SutD9CTHzzimVghkb-OiMhxdQrG_gYq_McLFzimreAMRZPcWpwJhZN219HtTOlK-LnBW2zVL79yZEBIkUMBcNMpg2TD8ZwJrO5zRzO9TKH3zmB0DX__e5om6t97uVoK-FdYxinaRbBE-BGHqUnr_K1Hal40thraGPbXLt8VOk2vbrOX9OJTWcUollZ5T4HIFleur-Hx5T1HxUAZQaeeieqrASZ5JSDCbJzqOCiHMQYEjCAA-0t4JGVh-Pu7YzhPQfjmpx-01hwh5SHxM_GEO_rTFiiEkfN_aOW_UL7e_O5xWOd9LQXQoYlS_MeB_KkXrEaN9vz — 204 — 17 B — 23 ms — h3https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — -1 — 0 B — 0 ms —
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
54% of JavaScript execution is third-party
First-party Third-party 4331ms · 547KB · MX$321/mo
Unattributable
Other
Costly
Execution 1197ms
Transfer 0 KB
Monthly Cost MX$89/mo
ajax.googleapis.com
Other
Costly
Execution 963ms
Transfer 33 KB
Monthly Cost MX$71/mo
Twitter/X Embed
Social
Costly
Execution 526ms
Transfer 27 KB
Unused 99%
Monthly Cost MX$39/mo
Google Tag Manager
Tag Manager
Costly
Execution 432ms
Transfer 160 KB
Unused 42%
Monthly Cost MX$32/mo
Facebook Pixel
Advertising
Costly
Execution 357ms
Transfer 78 KB
Unused 66%
Monthly Cost MX$26/mo
cse.google.com
Other
Costly
Execution 206ms
Transfer 3 KB
Monthly Cost MX$15/mo
Google Analytics
Analytics
Optional
Execution 148ms
Transfer 21 KB
Monthly Cost MX$11/mo
ajax.googleapis.com
Other
Optional
Execution 116ms
Transfer 60 KB
Unused 88%
Monthly Cost MX$9/mo
www.google.com
Other
Optional
Execution 110ms
Transfer 103 KB
Unused 51%
Monthly Cost MX$8/mo
cse.google.com
Other
Optional
Execution 102ms
Transfer 44 KB
Unused 73%
Monthly Cost MX$8/mo
static.cloudflareinsights.com
Other
Optional
Execution 97ms
Transfer 11 KB
Monthly Cost MX$7/mo
ep2.adtrafficquality.google
Other
Optional
Execution 76ms
Transfer 8 KB
Monthly Cost MX$6/mo

These scripts may cost more than they're worth

  • Unattributable adds 1197ms and costs ~MX$89/month
  • ajax.googleapis.com adds 963ms and costs ~MX$71/month
  • Twitter/X Embed adds 526ms and costs ~MX$39/month
  • Google Tag Manager adds 432ms and costs ~MX$32/month
  • Facebook Pixel adds 357ms and costs ~MX$26/month
  • cse.google.com adds 206ms and costs ~MX$15/month

54% 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 1197ms 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 963ms 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

Twitter/X Embed takes 526ms 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

99% of Twitter/X Embed'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

Google Tag Manager takes 432ms 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

Facebook Pixel takes 357ms 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

66% of Facebook Pixel'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 206ms 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

88% 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

51% of www.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

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

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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