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https://ucm.es

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
92
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.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
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.

443 ms

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

1.82 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.

0.038

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

838 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.83 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 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 71 requests
FIX
4.7 MB transferred, 71 requests
Critical::
Page weighs 6.4 MB (4.7 MB transferred)
Warning::
Images are 3.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.8 MB
Warning::
JavaScript is 566 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 566 KB
Info::
71 HTTP requests
Info::
Estimated 0.98 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
71 requests
0.98 g CO2 per page load
Images 3.8 MiB 82%
JavaScript 565.7 KiB 12%
Fonts 184.5 KiB 4%
CSS 74.0 KiB 2%
HTML 14.8 KiB 0%
Other 1.2 KiB 0%
Other 832 B 0%
Other 551 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

D
Third-Party Impact
Action
86% third-party, 0 ms blocking
FIX
86% third-party, 0 ms blocking
Warning::
Third-party code accounts for 86% of page weight (4.0 MiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
86%
First-party Third-party
D
JS Bundles
Action
9 scripts, 209 KB unused
FIX
9 scripts, 209 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-65GW...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-6XY0...: 64 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sdk.privacy-center.org/sdk/22ecd6bfac93de6...: 54 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ucm.es/themes/ucm24/js/jquery.min.js: 24 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ucm.es/themes/ucm24/js/bootstrap.js: unminified — 7 KB could be saved
Info::
Total unused JavaScript: 209 KB
209 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-65GWBF2XN6&cx=c&gtm=4e64h1156 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-6XY0QFTRLR158 KB64 KB (40%)✓3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js102 KB54 KB (54%)✓3rd
https://ucm.es/themes/ucm24/js/jquery.min.js41 KB24 KB (60%)✓1st
https://ucm.es/themes/ucm24/js/bootstrap.js22 KB—✗1st
https://ucm.es/themes/ucm24/js/ucm.js?ft=202604211405053 KB—✓1st
https://ucm.es/themes/ucm24/js/ucm_carousel.js?ft=202604211405052 KB—✓1st
https://sdk.privacy-center.org/dc628592-8975-46a5-82c3-2fb34d165e56/loader.js?target=ucm.es30 KB—✓3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/ui-web-en-web.22ecd6bfac93de604efec0b75b2c796ee1675f92.js53 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

D
Page Weight Inventory
Action
71 resources · 4.7 MB · 209 KB savings available
FIX
71 resources · 4.7 MB · 209 KB savings available
Warning::
Page weight 3.7 MB over 1MB target
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~209 KB of savings available
Warning::
32 third-party resources (86% of weight)
Info::
6 resources over 200KB
71 resources · 4.7 MiB · 32 third-party 3.7 MiB over 1MB target
Image 82% · 3.8 MiB
JavaScript 12% · 565.7 KiB
Font 4% · 184.5 KiB
CSS 2% · 74.0 KiB
Document 0% · 14.8 KiB
Other 0% · 1.4 KiB

~209.0 KiB of savings available

Remove unused JavaScript: 209.0 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, no-cache, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, no-cache, must-revalidate

DirectiveValueMeaning
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
C
Image Optimization
Action
46 images, 0 KB saveable
REVIEW
46 images, 0 KB saveable
Warning::
https://ucm.es/themes/ucm24/media/img/iconos/ucm-c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucm.es/ext/apps/file/news/deporte-2/?v... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucm.es/ext/apps/file/news/competicione... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucm.es/themes/ucm24/media/img/ucm-tribuna-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucm.es/themes/ucm24/media/img/iconos/ucm-b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucm.es/themes/ucm24/media/img/ucrania.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucm.es/ext/apps/file/news/osucm-navida... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucm.es/themes/ucm24/media/img/una-europa.s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucm.es/themes/ucm24/media/img/iconos/ucm-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucm.es/themes/ucm24/media/img/hrs4r.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucm.es/themes/ucm24/media/img/iconos/ucm-i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucm.es/themes/ucm24/media/img/iconos/ucm-o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucm.es/ext/apps/file/news/foto-portada... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucm.es/themes/ucm16/media/img/logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucm.es/themes/ucm24/media/img/logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucm.es/themes/ucm24/media/img/iconos/ucm-t... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucm.es/themes/ucm24/media/img/iconos/ucm-b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucm.es/ext/apps/file/news/investigacio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucm.es/themes/ucm24/media/img/iconos/ucm-s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucm.es/ext/apps/file/news/download/?ve... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucm.es/ext/apps/file/news/imagen-pa%CC... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
46 images 3.8 MB
0 oversized -0 KB
46 legacy format
21 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

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

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

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+
JS Execution Cost
275ms total JS execution
PASS
275ms total JS execution
Info::
Unattributable: 121ms CPU time
Info::
https://ucm.es/: 94ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-65GW...: 60ms CPU time
Warning::
Third-party scripts: 181ms (66% of total)

Main Thread Breakdown

Script Evaluation 39% Other 31% Style & Layout 14% Script Parsing & Compilation 9% Rendering 5%
ScriptTotalScriptingParse/CompileParty
Unattributable121ms6ms0ms3rd
https://ucm.es/94ms4ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-65GWBF2XN6&cx=c&gtm=4e64h160ms51ms8ms3rd
A+
Font Loading
2 fonts (185 KB)
PASS
2 fonts (185 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

185 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 500 ms 1.0 s 1.5 s FCP 443 ms LCP 1.8 shttps://ucm.es/themes/ucm24/fonts/Roboto-Regular.ttfRoboto-Regular.ttf https://ucm.es/themes/ucm24/fonts/Roboto-Regular.ttf — 104.7 KiB — 21 ms — font-display: swaphttps://ucm.es/themes/ucm24/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://ucm.es/themes/ucm24/fonts/fontawesome-webfont.woff2?v=4.7.0 — 79.8 KiB — 12 ms — font-display: swap
Roboto-Regular.ttf ttf swap
Size 105 KB
Load time 21 ms
Start 216 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fontawesome-webfont.woff2 unknown swap
Size 80 KB
Load time 12 ms
Start 217 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 ~108 KB and ~216 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
Network Waterfall
71 requests over 1313ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 443 ms LCP 1.8 shttps://ucm.es// https://ucm.es/ — 200 — 14.8 KiB — 117 ms — http/1.1https://ucm.es/themes/ucm24/css/bootstrap.css/themes/ucm24/css/bootstrap.css https://ucm.es/themes/ucm24/css/bootstrap.css — 200 — 32.7 KiB — 13 ms — http/1.1https://ucm.es/themes/ucm24/css/font-awesome.min.css/themes/ucm24/css/font-awesome.min.... https://ucm.es/themes/ucm24/css/font-awesome.min.css — 200 — 9.3 KiB — 14 ms — http/1.1https://ucm.es/themes/ucm24/css/ucm-theme.css?ft=20260421140505/themes/ucm24/css/ucm-theme.css?ft=... https://ucm.es/themes/ucm24/css/ucm-theme.css?ft=20260421140505 — 200 — 2.2 KiB — 13 ms — http/1.1https://ucm.es/themes/ucm24/css/ucm.css?ft=20260421140505/themes/ucm24/css/ucm.css?ft=202604... https://ucm.es/themes/ucm24/css/ucm.css?ft=20260421140505 — 200 — 6.7 KiB — 16 ms — http/1.1https://ucm.es/themes/ucm24/css/ucm-wg.css?ft=20260421140505/themes/ucm24/css/ucm-wg.css?ft=202... https://ucm.es/themes/ucm24/css/ucm-wg.css?ft=20260421140505 — 200 — 12.0 KiB — 19 ms — http/1.1https://ucm.es/themes/ucm24/css/ucm_home.css?ft=20260421140505/themes/ucm24/css/ucm_home.css?ft=2... https://ucm.es/themes/ucm24/css/ucm_home.css?ft=20260421140505 — 200 — 5.8 KiB — 20 ms — http/1.1https://ucm.es/themes/ucm24/css/menu_3.css?ft=20260421140504/themes/ucm24/css/menu_3.css?ft=202... https://ucm.es/themes/ucm24/css/menu_3.css?ft=20260421140504 — 200 — 2.0 KiB — 24 ms — http/1.1https://ucm.es/themes/ucm24/js/jquery.min.js/themes/ucm24/js/jquery.min.js https://ucm.es/themes/ucm24/js/jquery.min.js — 200 — 40.8 KiB — 24 ms — http/1.1https://ucm.es/themes/ucm24/media/img/logo.svg/themes/ucm24/media/img/logo.svg https://ucm.es/themes/ucm24/media/img/logo.svg — 200 — 138.0 KiB — 31 ms — http/1.1https://ucm.es/themes/ucm24/media/img/banderas/en.png/themes/ucm24/media/img/banderas/en... https://ucm.es/themes/ucm24/media/img/banderas/en.png — 200 — 1.3 KiB — 13 ms — http/1.1https://ucm.es/themes/ucm24/media/img/youtube.svg/themes/ucm24/media/img/youtube.svg https://ucm.es/themes/ucm24/media/img/youtube.svg — 200 — 1.3 KiB — 9 ms — http/1.1https://ucm.es/themes/ucm24/media/img/facebook.svg/themes/ucm24/media/img/facebook.sv... https://ucm.es/themes/ucm24/media/img/facebook.svg — 200 — 1.8 KiB — 8 ms — http/1.1https://ucm.es/themes/ucm24/media/img/x.svg/themes/ucm24/media/img/x.svg https://ucm.es/themes/ucm24/media/img/x.svg — 200 — 2.5 KiB — 10 ms — http/1.1https://ucm.es/themes/ucm24/js/bootstrap.js/themes/ucm24/js/bootstrap.js https://ucm.es/themes/ucm24/js/bootstrap.js — 200 — 21.8 KiB — 13 ms — http/1.1https://ucm.es/themes/ucm24/js/ucm.js?ft=20260421140505/themes/ucm24/js/ucm.js?ft=20260421... https://ucm.es/themes/ucm24/js/ucm.js?ft=20260421140505 — 200 — 2.9 KiB — 10 ms — http/1.1https://ucm.es/themes/ucm24/js/ucm_carousel.js?ft=20260421140505/themes/ucm24/js/ucm_carousel.js?ft... https://ucm.es/themes/ucm24/js/ucm_carousel.js?ft=20260421140505 — 200 — 2.0 KiB — 11 ms — http/1.1https://ucm.es/themes/ucm24/media/img/linkedin.svg/themes/ucm24/media/img/linkedin.sv... https://ucm.es/themes/ucm24/media/img/linkedin.svg — 200 — 1.5 KiB — 9 ms — http/1.1https://ucm.es/themes/ucm24/media/img/instagram.svg/themes/ucm24/media/img/instagram.s... https://ucm.es/themes/ucm24/media/img/instagram.svg — 200 — 2.1 KiB — 10 ms — http/1.1https://ucm.es/themes/ucm24/media/img/tiktok.svg/themes/ucm24/media/img/tiktok.svg https://ucm.es/themes/ucm24/media/img/tiktok.svg — 200 — 1.4 KiB — 13 ms — http/1.1https://ucm.es/themes/ucm24/media/img/bluesky.svg/themes/ucm24/media/img/bluesky.svg https://ucm.es/themes/ucm24/media/img/bluesky.svg — 200 — 1.3 KiB — 15 ms — http/1.1https://ucm.es/themes/ucm24/media/img/hrs4r.png/themes/ucm24/media/img/hrs4r.png https://ucm.es/themes/ucm24/media/img/hrs4r.png — 200 — 57.4 KiB — 15 ms — 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— 121 ms — http/1.1https://www.ucm.es/ext/apps/file/news/web-bn-pq-prl-01-262x200/?ver=mwww.ucm.es/ext/apps/file/news/web-b... https://www.ucm.es/ext/apps/file/news/web-bn-pq-prl-01-262x200/?ver=m — 200 — 39.0 KiB — 126 ms — http/1.1https://www.ucm.es/ext/apps/file/news/2claustro-universitario26/?ver=mwww.ucm.es/ext/apps/file/news/2clau... https://www.ucm.es/ext/apps/file/news/2claustro-universitario26/?ver=m — 200 — 34.4 KiB — 121 ms — http/1.1https://www.ucm.es/ext/apps/file/news/elecciones-claustro26/?ver=mwww.ucm.es/ext/apps/file/news/elecc... https://www.ucm.es/ext/apps/file/news/elecciones-claustro26/?ver=m — 200 — 47.2 KiB — 121 ms — http/1.1
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https://region1.analytics.google.com/g/collect?v=2&tid=G-6XY0QFTRLR&gtm=45je64h1v9102910134za200zd9102910134&_p=1776812461676&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&tcfd=1000h&_eu=AAAAAGA&are=1&cid=2045115892.1776812462&frm=0&pscdl=noapi&rcb=2&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401&sid=1776812461&sct=1&seg=0&dl=https%3A%2F%2Fucm.es%2F&dt=Universidad%20Complutense%20de%20Madrid&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1232 — 204 — 290 B — 46 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-6XY0QFTRLR&cid=2045115892.1776812462&gtm=45je64h1v9102910134za200zd9102910134&rcb=2&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938468~117266401stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-6XY0QFTRLR&cid=2045115892.1776812462&gtm=45je64h1v9102910134za200zd9102910134&rcb=2&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938468~117266401 — 204 — 551 B — 75 ms — h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-6XY0QFTRLR&cid=2045115892.1776812462&gtm=45je64h1v9102910134za200zd9102910134&rcb=2&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938468~117266401&z=1871381670www.google.es/ads/ga-audiences?v=1&... https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-6XY0QFTRLR&cid=2045115892.1776812462&gtm=45je64h1v9102910134za200zd9102910134&rcb=2&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938468~117266401&z=1871381670 — 200 — 408 B — 79 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
66% of JavaScript execution is third-party
First-party Third-party 181ms · 156KB · €2/mo
Unattributable
Other
Optional
Execution 121ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 60ms
Transfer 156 KB
Unused 43%
Monthly Cost €1/mo

66% 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

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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