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https://ucm.es

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
62
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.

1.83 s

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

7.62 s

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

158 ms

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

0.210

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

2.69 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.

13.59 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
17
7 PASS 3 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 74.1 KiB 2%
HTML 14.8 KiB 0%
Other 1.2 KiB 0%
Other 832 B 0%
Other 542 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 (59%)
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 (59%)✓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% · 74.1 KiB
Document 0% · 14.8 KiB
Other 0% · 1.3 KiB

~208.7 KiB of savings available

Remove unused JavaScript: 208.7 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-b... 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://www.ucm.es/ext/apps/file/news/concurso-pri... 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/elecciones-c... 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/jornadas-par... 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/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/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-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/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/iconos/ucm-o... 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://www.ucm.es/ext/apps/file/news/web-bn-pq-pr... 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/2claustro-un... 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/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-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-c... 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
19 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

C
JS Execution Cost
Action
1585ms total JS execution
REVIEW
1585ms total JS execution
Warning::
Unattributable: 478ms CPU time
Warning::
https://ucm.es/: 343ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-65GW...: 253ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-6XY0...: 175ms CPU time
Info::
https://sdk.privacy-center.org/sdk/22ecd6bfac93de6...: 165ms CPU time
Warning::
Third-party scripts: 1185ms (75% of total)

Main Thread Breakdown

Script Evaluation 40% Other 31% Style & Layout 13% Script Parsing & Compilation 9% Rendering 5%
ScriptTotalScriptingParse/CompileParty
Unattributable478ms23ms0ms3rd
https://ucm.es/343ms20ms1ms1st
https://www.googletagmanager.com/gtag/js?id=G-65GWBF2XN6&cx=c&gtm=4e64h1253ms215ms34ms3rd
https://www.googletagmanager.com/gtag/js?id=G-6XY0QFTRLR175ms137ms36ms3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js165ms133ms32ms3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/ui-web-en-web.22ecd6bfac93de604efec0b75b2c796ee1675f92.js114ms69ms21ms3rd
https://ucm.es/themes/ucm24/js/jquery.min.js57ms41ms8ms1st
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 (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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 1.8 s LCP 7.6 shttps://ucm.es/themes/ucm24/fonts/Roboto-Regular.ttfRoboto-Regular.ttf https://ucm.es/themes/ucm24/fonts/Roboto-Regular.ttf — 104.7 KiB — 16 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 — 16 ms — font-display: swap
Roboto-Regular.ttf ttf swap
Size 105 KB
Load time 16 ms
Start 152 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 16 ms
Start 152 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
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
71 requests over 1325ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 1.8 s LCP 7.6 shttps://ucm.es// https://ucm.es/ — 200 — 14.8 KiB — 59 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 — 32.8 KiB — 12 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 — 12 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 — 14 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 — 17 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 — 19 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 — 17 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 — 18 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 — 137.9 KiB — 16 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 — 10 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 — 9 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 — 9 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 — 15 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 — 9 ms — http/1.1https://ucm.es/themes/ucm24/js/ucm_carousel.js?ft=20260421140505/themes/ucm24/js/ucm_carousel.js?ft... 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http/1.1https://region1.analytics.google.com/g/collect?v=2&tid=G-6XY0QFTRLR&gtm=45je64h1v9102910134za200zd9102910134&_p=1776812445249&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&tcfd=1000h&_eu=AAAAAGA&are=1&cid=754841249.1776812446&frm=0&pscdl=noapi&rcb=0&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266401&sid=1776812445&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=1249region1.analytics.google.com/g/coll... https://region1.analytics.google.com/g/collect?v=2&tid=G-6XY0QFTRLR&gtm=45je64h1v9102910134za200zd9102910134&_p=1776812445249&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&tcfd=1000h&_eu=AAAAAGA&are=1&cid=754841249.1776812446&frm=0&pscdl=noapi&rcb=0&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266401&sid=1776812445&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=1249 — 204 — 290 B — 26 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-6XY0QFTRLR&cid=754841249.1776812446&gtm=45je64h1v9102910134za200zd9102910134&rcb=0&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115616986~115938466~115938468~117266401stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-6XY0QFTRLR&cid=754841249.1776812446&gtm=45je64h1v9102910134za200zd9102910134&rcb=0&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115616986~115938466~115938468~117266401 — 204 — 542 B — 70 ms — h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-6XY0QFTRLR&cid=754841249.1776812446&gtm=45je64h1v9102910134za200zd9102910134&rcb=0&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115616986~115938466~115938468~117266401&z=2040618692www.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=754841249.1776812446&gtm=45je64h1v9102910134za200zd9102910134&rcb=0&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115616986~115938466~115938468~117266401&z=2040618692 — 200 — 408 B — 74 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
75% of JavaScript execution is third-party
First-party Third-party 1185ms · 468KB · €13/mo
Unattributable
Other
Costly
Execution 478ms
Transfer 0 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 253ms
Transfer 156 KB
Unused 43%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 175ms
Transfer 158 KB
Unused 40%
Monthly Cost €2/mo
sdk.privacy-center.org
Other
Optional
Execution 165ms
Transfer 102 KB
Unused 54%
Monthly Cost €2/mo
sdk.privacy-center.org
Other
Optional
Execution 114ms
Transfer 53 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 478ms and costs ~€5/month
  • Google Tag Manager adds 253ms and costs ~€3/month

75% 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

Unattributable takes 478ms 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 253ms 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

54% of sdk.privacy-center.org'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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