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https://upv.es

Performance

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

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

Mobile Desktop
74
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
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.
92
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.

826 ms

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

2.10 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.

0.293

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

826 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.

2.12 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
12.5 MB transferred, 45 requests
FIX
12.5 MB transferred, 45 requests
Critical::
Page weighs 12.4 MB (12.5 MB transferred)
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Info::
45 HTTP requests
Info::
Estimated 2.6 g CO2 per page load
12.5 MB / 2.4 MB budget
12.5 MB transferred
45 requests
2.6 g CO2 per page load
Other 10.4 MiB 84%
Images 1.6 MiB 13%
JavaScript 176.0 KiB 1%
HTML 115.3 KiB 1%
Fonts 70.9 KiB 1%
CSS 59.0 KiB 0%
Other 15.1 KiB 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

D
Third-Party Impact
Action
84% third-party, 0 ms blocking
FIX
84% third-party, 0 ms blocking
Warning::
Third-party code accounts for 84% of page weight (10.5 MiB of 12.5 MiB)
Info::
Third-party blocking time is low (0 ms)
16%
84%
First-party Third-party
D
Page Weight Inventory
Action
45 resources · 12.5 MB · 70 KB savings available
FIX
45 resources · 12.5 MB · 70 KB savings available
Warning::
Page weight 11.5 MB over 1MB target
Got: 12.5 MB Expected: ≤ 1 MB
Info::
~70 KB of savings available
Warning::
5 third-party resources (84% of weight)
Info::
3 resources over 200KB
45 resources · 12.5 MiB · 5 third-party 11.5 MiB over 1MB target
Media 84% · 10.4 MiB
Image 13% · 1.6 MiB
JavaScript 1% · 176.0 KiB
Document 1% · 115.3 KiB
Font 1% · 70.9 KiB
CSS 0% · 59.0 KiB

~70.3 KiB of savings available

Remove unused JavaScript: 70.3 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.

C
Image Optimization
Action
28 images, 0 KB saveable
REVIEW
28 images, 0 KB saveable
Warning::
https://www.upv.es/imagenes/svg/enhance-logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/svg/sello_aneca.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/svg/logo-universia.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/card-6.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/upv-separador.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/pnoticias/upv-te-apunt... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/card-3.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/card-4.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/card-5.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/poli-consulta-negativo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/card-1.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/card-2.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/poli-consulta-blanco.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/svg/logo-UPV-light.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/svg/logo-h4s4r.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/svg/logo-upv.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/pnoticias/upv-master-2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/upv-letters.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/pnoticias/investigacio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/poli-sqf-negativo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/svg/logo-emas.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upv.es/imagenes/svg/logo-xarxa.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
28 images 1.6 MB
0 oversized -0 KB
28 legacy format
22 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

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Bundles
7 scripts, 70 KB unused
REVIEW
7 scripts, 70 KB unused
Warning::
https://www.upv.es/js/gsap.min.js: 29 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.upv.es/js/ScrollTrigger.min.js: 21 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.upv.es/js/Draggable.min.js: 20 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.upv.es/js/cookies.js: unminified — 3 KB could be saved
Info::
Total unused JavaScript: 70 KB
70 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.upv.es/js/gsap.min.js70 KB29 KB (42%)✓1st
https://www.upv.es/js/ScrollTrigger.min.js41 KB21 KB (52%)✓1st
https://www.upv.es/js/Draggable.min.js35 KB20 KB (58%)✓1st
https://www.upv.es/js/cookies.js16 KB—✗1st
https://www.upv.es/js/main.js6 KB—✓1st
https://www.upv.es/js/carousel.js7 KB—✗1st
https://www.upv.es/js/accordion.js1 KB—✓1st

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+
JS Execution Cost
398ms total JS execution
PASS
398ms total JS execution
Info::
Unattributable: 160ms CPU time
Info::
https://www.upv.es/: 96ms CPU time
Info::
https://www.upv.es/js/gsap.min.js: 80ms CPU time
Info::
https://www.upv.es/js/ScrollTrigger.min.js: 62ms CPU time
Info::
Third-party scripts: 160ms (40% of total)

Main Thread Breakdown

Other 53% Style & Layout 21% Script Evaluation 17% Rendering 6%
ScriptTotalScriptingParse/CompileParty
Unattributable160ms3ms0ms3rd
https://www.upv.es/96ms2ms1ms1st
https://www.upv.es/js/gsap.min.js80ms15ms2ms1st
https://www.upv.es/js/ScrollTrigger.min.js62ms22ms1ms1st
A+
Font Loading
3 fonts (71 KB)
PASS
3 fonts (71 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

71 KB total

Render-blocking

0

of 3

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 2.0 s FCP 826 ms LCP 2.1 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 58 ms — font-display: swaphttps://www.upv.es/fonts/upv/font/upv.woff2?94429120upv.woff2 https://www.upv.es/fonts/upv/font/upv.woff2?94429120 — 15.8 KiB — 16 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLCz7Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 7.7 KiB — 27 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 58 ms
Start 202 ms
Risk FOUT — text flashes from fallback to web font
upv.woff2 woff2 swap
Size 16 KB
Load time 16 ms
Start 202 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x... woff2 swap
Size 8 KB
Load time 27 ms
Start 202 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)
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
45 requests over 531ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 826 ms LCP 2.1 shttps://www.upv.es// https://www.upv.es/ — 200 — 115.3 KiB — 63 ms — http/1.1https://fonts.googleapis.com/css2?family=Inter:wght@400;700&family=Poppins:wght@700&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@400;700&family=Poppins:wght@700&display=swap — 200 — 1.2 KiB — 90 ms — h2https://www.upv.es/css/main.min.css/css/main.min.css https://www.upv.es/css/main.min.css — 200 — 50.8 KiB — 25 ms — http/1.1https://www.upv.es/js/gsap.min.js/js/gsap.min.js https://www.upv.es/js/gsap.min.js — 200 — 70.1 KiB — 42 ms — http/1.1https://www.upv.es/js/ScrollTrigger.min.js/js/ScrollTrigger.min.js https://www.upv.es/js/ScrollTrigger.min.js — 200 — 40.7 KiB — 36 ms — http/1.1https://www.upv.es/js/Draggable.min.js/js/Draggable.min.js https://www.upv.es/js/Draggable.min.js — 200 — 34.9 KiB — 44 ms — http/1.1https://www.upv.es/fonts/upv/css/upv.css/fonts/upv/css/upv.css https://www.upv.es/fonts/upv/css/upv.css — 200 — 6.9 KiB — 21 ms — http/1.1https://www.upv.es/imagenes/svg/logo-upv.svg/imagenes/svg/logo-upv.svg https://www.upv.es/imagenes/svg/logo-upv.svg — 200 — 85.5 KiB — 48 ms — http/1.1https://www.upv.es/imagenes/upv-separador.jpg/imagenes/upv-separador.jpg https://www.upv.es/imagenes/upv-separador.jpg — 200 — 87.7 KiB — 42 ms — http/1.1https://www.upv.es/imagenes/pnoticias/upv-master-2023.jpg/imagenes/pnoticias/upv-master-2023... https://www.upv.es/imagenes/pnoticias/upv-master-2023.jpg — 200 — 378.4 KiB — 58 ms — http/1.1https://www.upv.es/imagenes/pnoticias/upv-te-apuntas-2023.jpg/imagenes/pnoticias/upv-te-apuntas-... https://www.upv.es/imagenes/pnoticias/upv-te-apuntas-2023.jpg — 200 — 153.4 KiB — 50 ms — http/1.1https://www.upv.es/imagenes/upv-letters.svg/imagenes/upv-letters.svg https://www.upv.es/imagenes/upv-letters.svg — 200 — 1.4 KiB — 28 ms — http/1.1https://www.upv.es/js/cookies.js/js/cookies.js https://www.upv.es/js/cookies.js — 200 — 16.5 KiB — 33 ms — http/1.1https://www.upv.es/js/main.js/js/main.js https://www.upv.es/js/main.js — 200 — 5.8 KiB — 27 ms — http/1.1https://www.upv.es/js/carousel.js/js/carousel.js https://www.upv.es/js/carousel.js — 200 — 7.0 KiB — 27 ms — http/1.1https://www.upv.es/js/accordion.js/js/accordion.js https://www.upv.es/js/accordion.js — 200 — 1.0 KiB — 23 ms — http/1.1https://www.upv.es/imagenes/card-1.jpg/imagenes/card-1.jpg https://www.upv.es/imagenes/card-1.jpg — 200 — 40.9 KiB — 31 ms — http/1.1https://www.upv.es/imagenes/card-2.jpg/imagenes/card-2.jpg https://www.upv.es/imagenes/card-2.jpg — 200 — 38.8 KiB — 42 ms — http/1.1https://www.upv.es/imagenes/card-3.jpg/imagenes/card-3.jpg https://www.upv.es/imagenes/card-3.jpg — 200 — 56.1 KiB — 80 ms — http/1.1https://www.upv.es/imagenes/card-4.jpg/imagenes/card-4.jpg https://www.upv.es/imagenes/card-4.jpg — 200 — 39.0 KiB — 73 ms — http/1.1https://www.upv.es/imagenes/card-5.jpg/imagenes/card-5.jpg https://www.upv.es/imagenes/card-5.jpg — 200 — 37.1 KiB — 69 ms — http/1.1https://www.upv.es/imagenes/card-6.jpg/imagenes/card-6.jpg https://www.upv.es/imagenes/card-6.jpg — 200 — 66.2 KiB — 71 ms — http/1.1https://www.upv.es/imagenes/pnoticias/imgpreview-1.jpg/imagenes/pnoticias/imgpreview-1.jp... https://www.upv.es/imagenes/pnoticias/imgpreview-1.jpg — 200 — 91.4 KiB — 29 ms — http/1.1https://www.upv.es/imagenes/pnoticias/port_jpa_online_grados_latam_2026.jpg/imagenes/pnoticias/port_jpa_online... https://www.upv.es/imagenes/pnoticias/port_jpa_online_grados_latam_2026.jpg — 200 — 47.5 KiB — 24 ms — http/1.1https://www.upv.es/imagenes/pnoticias/port_MUTSRC_2026.jpg/imagenes/pnoticias/port_MUTSRC_202... https://www.upv.es/imagenes/pnoticias/port_MUTSRC_2026.jpg — 200 — 45.6 KiB — 23 ms — http/1.1https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2fonts.gstatic.com/s/inter/v20/UcC73... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 200 — 47.3 KiB — 58 ms — h3https://www.upv.es/fonts/upv/font/upv.woff2?94429120/fonts/upv/font/upv.woff2?94429120 https://www.upv.es/fonts/upv/font/upv.woff2?94429120 — 200 — 15.8 KiB — 16 ms — http/1.1https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 200 — 7.7 KiB — 27 ms — h3https://moneres.upv.es/tv/videos-home/portada_alumnos_e.webmmoneres.upv.es/tv/videos-home/porta... https://moneres.upv.es/tv/videos-home/portada_alumnos_e.webm — 206 — 5.1 MiB — 211 ms — h2https://moneres.upv.es/tv/videos-home/portada_alumnos_m.webmmoneres.upv.es/tv/videos-home/porta... https://moneres.upv.es/tv/videos-home/portada_alumnos_m.webm — 206 — 5.3 MiB — 318 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 826 ms LCP 2.1 shttps://www.upv.es// https://www.upv.es/ — 200 — 115.3 KiB — 63 ms — http/1.1https://fonts.googleapis.com/css2?family=Inter:wght@400;700&family=Poppins:wght@700&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@400;700&family=Poppins:wght@700&display=swap — 200 — 1.2 KiB — 90 ms — h2https://www.upv.es/css/main.min.css/css/main.min.css https://www.upv.es/css/main.min.css — 200 — 50.8 KiB — 25 ms — http/1.1https://www.upv.es/js/gsap.min.js/js/gsap.min.js https://www.upv.es/js/gsap.min.js — 200 — 70.1 KiB — 42 ms — http/1.1https://www.upv.es/js/ScrollTrigger.min.js/js/ScrollTrigger.min.js https://www.upv.es/js/ScrollTrigger.min.js — 200 — 40.7 KiB — 36 ms — http/1.1https://www.upv.es/js/Draggable.min.js/js/Draggable.min.js https://www.upv.es/js/Draggable.min.js — 200 — 34.9 KiB — 44 ms — http/1.1https://www.upv.es/fonts/upv/css/upv.css/fonts/upv/css/upv.css 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
40% of JavaScript execution is third-party
First-party Third-party 160ms · 0KB · €2/mo
Unattributable
Other
Optional
Execution 160ms
Transfer 0 KB
Monthly Cost €2/mo

40% 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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