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https://uab.cat

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

758 ms

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

4.58 s

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

11 ms

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

0.316

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

1.24 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.

4.68 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
7.5 MB transferred, 49 requests
FIX
7.5 MB transferred, 49 requests
Critical::
Page weighs 9.1 MB (7.5 MB transferred)
Warning::
Images are 6.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 6.6 MB
Warning::
JavaScript is 624 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 624 KB
Info::
Fonts are 301 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 301 KB
Info::
49 HTTP requests
Info::
Estimated 1.6 g CO2 per page load
7.5 MB / 2.4 MB budget
7.5 MB transferred
49 requests
1.6 g CO2 per page load
Images 6.6 MiB 87%
JavaScript 624.2 KiB 8%
Fonts 300.8 KiB 4%
Other 37.5 KiB 0%
CSS 24.5 KiB 0%
HTML 15.2 KiB 0%
Other 945 B 0%
Other 609 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (7.5 MiB of 7.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
49 resources · 7.5 MB · 228 KB savings available
FIX
49 resources · 7.5 MB · 228 KB savings available
Warning::
Page weight 6.5 MB over 1MB target
Got: 7.5 MB Expected: ≤ 1 MB
Info::
~228 KB of savings available
Warning::
48 third-party resources (100% of weight)
Info::
10 resources over 200KB
49 resources · 7.5 MiB · 48 third-party 6.5 MiB over 1MB target
Image 87% · 6.6 MiB
JavaScript 8% · 624.2 KiB
Font 4% · 300.8 KiB
CSS 0% · 24.5 KiB
Document 0% · 15.6 KiB
Other 0% · 1.5 KiB

~228.4 KiB of savings available

Remove unused JavaScript: 228.4 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
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Warning::
https://www.uab.cat/Imatge/615/621/logo-ECIU,0.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uab.cat/Imatge/554/849/logo-EUA,0.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uab.cat/Imatge/423/772/logo-hr,0.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uab.cat/Imatge/688/150/logo-XVU,0.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uab.cat/Imatge/699/912/logo-A4U,0.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
27 images 6.6 MB
0 oversized -0 KB
27 legacy format
5 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

C
JS Bundles
Action
8 scripts, 228 KB unused
REVIEW
8 scripts, 228 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2CH1...: 66 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-103...: 64 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PW3...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://consent.cookiebot.com/e3f09dda-a690-4207-b...: 35 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 228 KB
228 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-2CH1808E6F&cx=c&gtm=4e64k0173 KB66 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1032775476&cx=c&gtm=4e64k0136 KB64 KB (47%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PW3QBZ4156 KB64 KB (41%)✓3rd
https://consent.cookiebot.com/e3f09dda-a690-4207-be93-92a2217eddc0/cc.js?renew=false&referer=www.uab.cat&dnt=false&init=false&culture=ca92 KB35 KB (38%)✓3rd
https://code.jquery.com/jquery-3.4.1.slim.min.js24 KB—✓3rd
https://www.uab.cat/Xcelerate/WAI/js/utils.min.js4 KB—✓3rd
https://www.uab.cat/Xcelerate/WAI/js/vendor/owl/owl.carousel.min.js11 KB—✓3rd
https://consent.cookiebot.com/uc.js?cbid=e3f09dda-a690-4207-be93-92a2217eddc0&implementation=gtm&consentmode-dataredaction=dynamic&culture=ca27 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

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
368ms total JS execution
PASS
368ms total JS execution
Info::
Unattributable: 99ms CPU time
Info::
https://www.uab.cat/: 74ms CPU time
Info::
https://code.jquery.com/jquery-3.4.1.slim.min.js: 71ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-2CH1...: 63ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PW3...: 61ms CPU time
Warning::
Third-party scripts: 368ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Other 24% Style & Layout 13% Script Parsing & Compilation 10% Parse HTML & CSS 6% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable99ms2ms0ms3rd
https://www.uab.cat/74ms2ms1ms3rd
https://code.jquery.com/jquery-3.4.1.slim.min.js71ms38ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2CH1808E6F&cx=c&gtm=4e64k063ms51ms11ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PW3QBZ461ms48ms11ms3rd
A+
Font Loading
2 fonts (301 KB)
PASS
2 fonts (301 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

301 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 FCP 758 ms LCP 4.6 shttps://www.uab.cat/Xcelerate/WAI/font/Mona-Sans.woff2Mona-Sans.woff2 https://www.uab.cat/Xcelerate/WAI/font/Mona-Sans.woff2 — 134.3 KiB — 45 ms — font-display: swaphttps://www.uab.cat/Xcelerate/WAI/font/Hubot-Sans.woff2Hubot-Sans.woff2 https://www.uab.cat/Xcelerate/WAI/font/Hubot-Sans.woff2 — 166.5 KiB — 109 ms — font-display: swap
Mona-Sans.woff2 woff2 swap
Size 134 KB
Load time 45 ms
Start 254 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Hubot-Sans.woff2 woff2 swap
Size 167 KB
Load time 109 ms
Start 254 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~150 KB and ~300 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
49 requests over 2112ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 758 ms LCP 4.6 shttps://uab.cat// https://uab.cat/ — 301 — 316 B — 51 ms — http/1.1https://www.uab.cat/www.uab.cat/ https://www.uab.cat/ — 200 — 14.5 KiB — 194 ms — http/1.1https://www.uab.cat/Xcelerate/WAI/font/Mona-Sans.woff2www.uab.cat/Xcelerate/WAI/font/Mona... https://www.uab.cat/Xcelerate/WAI/font/Mona-Sans.woff2 — 200 — 134.3 KiB — 45 ms — http/1.1https://www.uab.cat/Xcelerate/WAI/font/Hubot-Sans.woff2www.uab.cat/Xcelerate/WAI/font/Hubo... https://www.uab.cat/Xcelerate/WAI/font/Hubot-Sans.woff2 — 200 — 166.5 KiB — 109 ms — http/1.1https://www.uab.cat/Xcelerate/WAI/css/sites/portal.csswww.uab.cat/Xcelerate/WAI/css/sites... https://www.uab.cat/Xcelerate/WAI/css/sites/portal.css — 200 — 23.0 KiB — 78 ms — http/1.1https://www.uab.cat/Xcelerate/WAI/css/vendor/owl/owl.carousel.min.csswww.uab.cat/Xcelerate/WAI/css/vendo... https://www.uab.cat/Xcelerate/WAI/css/vendor/owl/owl.carousel.min.css — 200 — 1.4 KiB — 68 ms — http/1.1https://code.jquery.com/jquery-3.4.1.slim.min.jscode.jquery.com/jquery-3.4.1.slim.m... https://code.jquery.com/jquery-3.4.1.slim.min.js — 200 — 24.1 KiB — 42 ms — h2https://www.uab.cat/Imatge/993/829/estudis-estudiants.jpgwww.uab.cat/Imatge/993/829/estudis-... https://www.uab.cat/Imatge/993/829/estudis-estudiants.jpg — 200 — 96.9 KiB — 198 ms — http/1.1https://www.uab.cat/Imatge/654/779/RecercaUAB.jpgwww.uab.cat/Imatge/654/779/RecercaU... https://www.uab.cat/Imatge/654/779/RecercaUAB.jpg — 200 — 252.8 KiB — 119 ms — http/1.1https://www.uab.cat/Imatge/236/470/serveis,10.jpgwww.uab.cat/Imatge/236/470/serveis,... https://www.uab.cat/Imatge/236/470/serveis,10.jpg — 200 — 412.1 KiB — 305 ms — http/1.1https://www.uab.cat/Imatge/381/231/2026_Frida-38_web.jpgwww.uab.cat/Imatge/381/231/2026_Fri... https://www.uab.cat/Imatge/381/231/2026_Frida-38_web.jpg — 200 — 270.6 KiB — 58 ms — http/1.1https://www.uab.cat/Imatge/1008/171/infok.jpgwww.uab.cat/Imatge/1008/171/infok.j... https://www.uab.cat/Imatge/1008/171/infok.jpg — 200 — 71.8 KiB — 42 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-PW3QBZ4www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PW3QBZ4 — 200 — 156.1 KiB — 138 ms — h2https://www.uab.cat/Xcelerate/WAI/js/utils.min.jswww.uab.cat/Xcelerate/WAI/js/utils.... https://www.uab.cat/Xcelerate/WAI/js/utils.min.js — 200 — 3.9 KiB — 296 ms — http/1.1https://www.uab.cat/Xcelerate/WAI/js/vendor/owl/owl.carousel.min.jswww.uab.cat/Xcelerate/WAI/js/vendor... https://www.uab.cat/Xcelerate/WAI/js/vendor/owl/owl.carousel.min.js — 200 — 11.5 KiB — 109 ms — http/1.1https://www.uab.cat/Imatge/129/950/LLORO-KEA-DISCAPACITAT_XimenaNelsonUC-ok.jpgwww.uab.cat/Imatge/129/950/LLORO-KE... https://www.uab.cat/Imatge/129/950/LLORO-KEA-DISCAPACITAT_XimenaNelsonUC-ok.jpg — 200 — 130.3 KiB — 138 ms — http/1.1https://www.uab.cat/Xcelerate/WAI/img/UAB-2linies-verd.svgwww.uab.cat/Xcelerate/WAI/img/UAB-2... https://www.uab.cat/Xcelerate/WAI/img/UAB-2linies-verd.svg — 200 — 8.2 KiB — 24 ms — http/1.1https://www.uab.cat/Imatge/788/485/IIJornadaTransferenciaCSiH.pngwww.uab.cat/Imatge/788/485/IIJornad... https://www.uab.cat/Imatge/788/485/IIJornadaTransferenciaCSiH.png — 200 — 722.1 KiB — 424 ms — http/1.1https://www.uab.cat/Imatge/944/99/jugato1_web.jpegwww.uab.cat/Imatge/944/99/jugato1_w... https://www.uab.cat/Imatge/944/99/jugato1_web.jpeg — 200 — 134.2 KiB — 95 ms — http/1.1https://www.uab.cat/Imatge/927/888/IncendiOdena_LidarTeam_2016_webUAB.jpgwww.uab.cat/Imatge/927/888/IncendiO... https://www.uab.cat/Imatge/927/888/IncendiOdena_LidarTeam_2016_webUAB.jpg — 200 — 328.8 KiB — 137 ms — http/1.1https://www.uab.cat/Imatge/820/399/PDCOGs_Graphical_Abstract.jpgwww.uab.cat/Imatge/820/399/PDCOGs_G... https://www.uab.cat/Imatge/820/399/PDCOGs_Graphical_Abstract.jpg — 200 — 58.5 KiB — 158 ms — http/1.1https://consent.cookiebot.com/uc.js?cbid=e3f09dda-a690-4207-be93-92a2217eddc0&implementation=gtm&consentmode-dataredaction=dynamic&culture=caconsent.cookiebot.com/uc.js?cbid=e3... https://consent.cookiebot.com/uc.js?cbid=e3f09dda-a690-4207-be93-92a2217eddc0&implementation=gtm&consentmode-dataredaction=dynamic&culture=ca — 200 — 27.0 KiB — 21 ms — h2https://www.googletagmanager.com/gtag/js?id=G-2CH1808E6F&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-2CH1808E6F&cx=c&gtm=4e64k0 — 200 — 172.8 KiB — 66 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-1032775476&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-1032775476&cx=c&gtm=4e64k0 — 200 — 136.4 KiB — 49 ms — h2https://www.uab.cat/Imatge/270/56/TaulaPicnic,1.jpgwww.uab.cat/Imatge/270/56/TaulaPicn... https://www.uab.cat/Imatge/270/56/TaulaPicnic,1.jpg — 200 — 96.4 KiB — 103 ms — http/1.1https://pagead2.googlesyndication.com/ccm/collect?rcb=19&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.uab.cat%2F&scrsrc=www.googletagmanager.com&rnd=1306538119.1776890841&navt=n&npa=1&ep.ads_data_redaction=1&gdid=dMWZhNz&_tu=CA&gtm=45He64k0v76367590za200zd76367590xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115938466~115938468~117266400~118128922&apve=1&apvf=f&apvc=1&tft=1776890841216&tfd=552pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=19&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.uab.cat%2F&scrsrc=www.googletagmanager.com&rnd=1306538119.1776890841&navt=n&npa=1&ep.ads_data_redaction=1&gdid=dMWZhNz&_tu=CA&gtm=45He64k0v76367590za200zd76367590xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115938466~115938468~117266400~118128922&apve=1&apvf=f&apvc=1&tft=1776890841216&tfd=552 — 200 — 21 B — 111 ms — h3https://consentcdn.cookiebot.com/consentconfig/e3f09dda-a690-4207-be93-92a2217eddc0/settings.jsonconsentcdn.cookiebot.com/consentcon... https://consentcdn.cookiebot.com/consentconfig/e3f09dda-a690-4207-be93-92a2217eddc0/settings.json — 200 — 945 B — 22 ms — h2https://consent.cookiebot.com/e3f09dda-a690-4207-be93-92a2217eddc0/cc.js?renew=false&referer=www.uab.cat&dnt=false&init=false&culture=caconsent.cookiebot.com/e3f09dda-a690... https://consent.cookiebot.com/e3f09dda-a690-4207-be93-92a2217eddc0/cc.js?renew=false&referer=www.uab.cat&dnt=false&init=false&culture=ca — 200 — 92.5 KiB — 80 ms — h2https://consentcdn.cookiebot.com/sdk/bc-v4.min.htmlconsentcdn.cookiebot.com/sdk/bc-v4.... https://consentcdn.cookiebot.com/sdk/bc-v4.min.html — 200 — 809 B — 16 ms — h2https://www.uab.cat/Imatge/151/373/grasa,1.jpgwww.uab.cat/Imatge/151/373/grasa,1.... https://www.uab.cat/Imatge/151/373/grasa,1.jpg — 200 — 69.8 KiB — 67 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 758 ms LCP 4.6 shttps://uab.cat// https://uab.cat/ — 301 — 316 B — 51 ms — http/1.1https://www.uab.cat/www.uab.cat/ https://www.uab.cat/ — 200 — 14.5 KiB — 194 ms — http/1.1https://www.uab.cat/Xcelerate/WAI/font/Mona-Sans.woff2www.uab.cat/Xcelerate/WAI/font/Mona... https://www.uab.cat/Xcelerate/WAI/font/Mona-Sans.woff2 — 200 — 134.3 KiB — 45 ms — http/1.1https://www.uab.cat/Xcelerate/WAI/font/Hubot-Sans.woff2www.uab.cat/Xcelerate/WAI/font/Hubo... https://www.uab.cat/Xcelerate/WAI/font/Hubot-Sans.woff2 — 200 — 166.5 KiB — 109 ms — http/1.1https://www.uab.cat/Xcelerate/WAI/css/sites/portal.csswww.uab.cat/Xcelerate/WAI/css/sites... https://www.uab.cat/Xcelerate/WAI/css/sites/portal.css — 200 — 23.0 KiB — 78 ms — http/1.1https://www.uab.cat/Xcelerate/WAI/css/vendor/owl/owl.carousel.min.csswww.uab.cat/Xcelerate/WAI/css/vendo... https://www.uab.cat/Xcelerate/WAI/css/vendor/owl/owl.carousel.min.css — 200 — 1.4 KiB — 68 ms — http/1.1https://code.jquery.com/jquery-3.4.1.slim.min.jscode.jquery.com/jquery-3.4.1.slim.m... https://code.jquery.com/jquery-3.4.1.slim.min.js — 200 — 24.1 KiB — 42 ms — h2https://www.uab.cat/Imatge/993/829/estudis-estudiants.jpgwww.uab.cat/Imatge/993/829/estudis-... https://www.uab.cat/Imatge/993/829/estudis-estudiants.jpg — 200 — 96.9 KiB — 198 ms — http/1.1https://www.uab.cat/Imatge/654/779/RecercaUAB.jpgwww.uab.cat/Imatge/654/779/RecercaU... https://www.uab.cat/Imatge/654/779/RecercaUAB.jpg — 200 — 252.8 KiB — 119 ms — http/1.1https://www.uab.cat/Imatge/236/470/serveis,10.jpgwww.uab.cat/Imatge/236/470/serveis,... https://www.uab.cat/Imatge/236/470/serveis,10.jpg — 200 — 412.1 KiB — 305 ms — http/1.1https://www.uab.cat/Imatge/381/231/2026_Frida-38_web.jpgwww.uab.cat/Imatge/381/231/2026_Fri... https://www.uab.cat/Imatge/381/231/2026_Frida-38_web.jpg — 200 — 270.6 KiB — 58 ms — http/1.1https://www.uab.cat/Imatge/1008/171/infok.jpgwww.uab.cat/Imatge/1008/171/infok.j... 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http/1.1https://consent.cookiebot.com/uc.js?cbid=e3f09dda-a690-4207-be93-92a2217eddc0&implementation=gtm&consentmode-dataredaction=dynamic&culture=caconsent.cookiebot.com/uc.js?cbid=e3... https://consent.cookiebot.com/uc.js?cbid=e3f09dda-a690-4207-be93-92a2217eddc0&implementation=gtm&consentmode-dataredaction=dynamic&culture=ca — 200 — 27.0 KiB — 21 ms — h2https://www.googletagmanager.com/gtag/js?id=G-2CH1808E6F&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-2CH1808E6F&cx=c&gtm=4e64k0 — 200 — 172.8 KiB — 66 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-1032775476&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-1032775476&cx=c&gtm=4e64k0 — 200 — 136.4 KiB — 49 ms — h2https://www.uab.cat/Imatge/270/56/TaulaPicnic,1.jpgwww.uab.cat/Imatge/270/56/TaulaPicn... https://www.uab.cat/Imatge/270/56/TaulaPicnic,1.jpg — 200 — 96.4 KiB — 103 ms — http/1.1https://pagead2.googlesyndication.com/ccm/collect?rcb=19&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.uab.cat%2F&scrsrc=www.googletagmanager.com&rnd=1306538119.1776890841&navt=n&npa=1&ep.ads_data_redaction=1&gdid=dMWZhNz&_tu=CA&gtm=45He64k0v76367590za200zd76367590xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115938466~115938468~117266400~118128922&apve=1&apvf=f&apvc=1&tft=1776890841216&tfd=552pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=19&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.uab.cat%2F&scrsrc=www.googletagmanager.com&rnd=1306538119.1776890841&navt=n&npa=1&ep.ads_data_redaction=1&gdid=dMWZhNz&_tu=CA&gtm=45He64k0v76367590za200zd76367590xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115938466~115938468~117266400~118128922&apve=1&apvf=f&apvc=1&tft=1776890841216&tfd=552 — 200 — 21 B — 111 ms — 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http/1.1https://www.uab.cat/Imatge/228/670/rtve,2.jpgwww.uab.cat/Imatge/228/670/rtve,2.j... https://www.uab.cat/Imatge/228/670/rtve,2.jpg — 200 — 51.6 KiB — 150 ms — http/1.1https://www.uab.cat/Imatge/104/593/vang15IV.jpgwww.uab.cat/Imatge/104/593/vang15IV... https://www.uab.cat/Imatge/104/593/vang15IV.jpg — 200 — 154.2 KiB — 118 ms — http/1.1https://pagead2.googlesyndication.com/ccm/collect?rcb=14&frm=0&en=page_view&dl=https%3A%2F%2Fwww.uab.cat%2F&scrsrc=www.googletagmanager.com&rnd=1306538119.1776890841&navt=n&npa=1&us_privacy=1YNY&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45be64k0v9233060638z876367590za20gzb76367590zd76367590xec&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115616985~115938466~115938468~117266401~118463262&apve=1&apvf=f&apvc=0&tids=AW-1032775476&tid=AW-1032775476&tft=1776890841319&tfd=655pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=14&frm=0&en=page_view&dl=https%3A%2F%2Fwww.uab.cat%2F&scrsrc=www.googletagmanager.com&rnd=1306538119.1776890841&navt=n&npa=1&us_privacy=1YNY&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45be64k0v9233060638z876367590za20gzb76367590zd76367590xec&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115616985~115938466~115938468~117266401~118463262&apve=1&apvf=f&apvc=0&tids=AW-1032775476&tid=AW-1032775476&tft=1776890841319&tfd=655 — 200 — 21 B — 157 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=14&frm=0&ae=g&dl=https%3A%2F%2Fwww.uab.cat%2F&scrsrc=www.googletagmanager.com&rnd=1306538119.1776890841&navt=n&npa=1&us_privacy=1YNY&ep.ads_data_redaction=1&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45be64k0v9233060638z876367590za20gzb76367590zd76367590xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115616985~115938466~115938468~117266401~118463262&apve=1&apvf=f&apvc=0&tids=AW-1032775476&tid=AW-1032775476&tft=1776890841320&tfd=656pagead2.googlesyndication.com/ccm/c... 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200 — 7.2 KiB — 26 ms — http/1.1https://www.uab.cat/Imatge/554/849/logo-EUA,0.pngwww.uab.cat/Imatge/554/849/logo-EUA... https://www.uab.cat/Imatge/554/849/logo-EUA,0.png — 200 — 6.5 KiB — 27 ms — http/1.1https://www.uab.cat/Imatge/688/150/logo-XVU,0.pngwww.uab.cat/Imatge/688/150/logo-XVU... https://www.uab.cat/Imatge/688/150/logo-XVU,0.png — 200 — 13.8 KiB — 27 ms — http/1.1https://region1.google-analytics.com/g/collect?v=2&tid=G-2CH1808E6F&gtm=45je64k0v872841904z876367590za20gzb76367590zd76367590&_p=1776890841010&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&gdid=dMWZhNz&ecid=394878791&_eu=AAAAAGA&are=1&cid=537077400.1776890841&ec_mode=a&frm=0&pscdl=denied&rcb=15&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&gaf=2&_s=1&tag_exp=0~115938466~115938469~117266400~117512542&sid=1776890841&sct=1&seg=0&dl=https%3A%2F%2Fwww.uab.cat%2F&dt=Universitat%20Aut%C3%B2noma%20de%20Barcelona%20-%20UAB%20Barcelona&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&up.site=UAB2013&up.language=ca&up.urlRenamed=UAB2013%2Funiversitat-autonoma-de-barcelona-1345467950436.html&tfd=721region1.google-analytics.com/g/coll... 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https://www.uab.cat/Imatge/299/982/imatge03.jpg — 200 — 373.3 KiB — 222 ms — http/1.1https://www.uab.cat/Imatge/857/117/25fotocampus.jpgwww.uab.cat/Imatge/857/117/25fotoca... https://www.uab.cat/Imatge/857/117/25fotocampus.jpg — 200 — 1.9 MiB — 1.2 s — http/1.1https://www.uab.cat/Xcelerate/WAI/img/simbol.pngwww.uab.cat/Xcelerate/WAI/img/simbo... https://www.uab.cat/Xcelerate/WAI/img/simbol.png — 200 — 10.1 KiB — 19 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 368ms · 367KB · €4/mo
Unattributable
Other
Optional
Execution 99ms
Transfer 0 KB
Monthly Cost €1/mo
www.uab.cat
Other
Optional
Execution 74ms
Transfer 14 KB
Monthly Cost €1/mo
code.jquery.com
Other
Optional
Execution 71ms
Transfer 24 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 63ms
Transfer 173 KB
Unused 38%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 156 KB
Unused 41%
Monthly Cost €1/mo

100% 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

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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