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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
45
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.
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.

9.11 s

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

15.89 s

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

458 ms

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

0.000

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

9.11 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.

16.21 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 2 REVIEW 6 FIX
F
Page Weight Budget
Action
2.6 MB transferred, 112 requests
FIX
2.6 MB transferred, 112 requests
Warning::
Page weighs 6.3 MB (2.6 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Warning::
112 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.55 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
112 requests
0.55 g CO2 per page load
Images 1.2 MiB 47%
JavaScript 1.0 MiB 39%
CSS 190.5 KiB 7%
Fonts 146.0 KiB 5%
HTML 28.4 KiB 1%
Other 1.3 KiB 0%
Other 945 B 0%
Other 567 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

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 (2.6 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3670ms total JS execution
FIX
3670ms total JS execution
Warning::
https://consent.cookiebot.com/uc.js: 1064ms CPU time
Warning::
Unattributable: 642ms CPU time
Warning::
https://web.ub.edu/web/ub/: 594ms CPU time
Warning::
https://web.ub.edu/o/frontend-js-spa-web/__liferay...: 338ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MLP...: 282ms CPU time
Warning::
Third-party scripts: 3670ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 20% Style & Layout 12% Parse HTML & CSS 10% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://consent.cookiebot.com/uc.js1064ms667ms17ms3rd
Unattributable642ms46ms0ms3rd
https://web.ub.edu/web/ub/594ms28ms13ms3rd
https://web.ub.edu/o/frontend-js-spa-web/__liferay__/index.js338ms322ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MLPG24R282ms223ms56ms3rd
https://www.googletagmanager.com/gtag/js?id=G-5BRF8HTDBV&cx=c&gtm=4e64h1257ms219ms32ms3rd
https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410387027&/o/frontend-js-aui-web/aui/aui/aui-min.js&/o/frontend-js-aui-web/liferay/modules.js&/o/frontend-js-aui-web/liferay/aui_sandbox.js&/o/frontend-js-aui-web/aui/attribute-base/attribute-base-min.js&/o/frontend-js-aui-web/aui/attribute-complex/attribute-complex-min.js&/o/frontend-js-aui-web/aui/attribute-core/attribute-core-min.js&/o/frontend-js-aui-web/aui/attribute-observable/attribute-observable-min.js&/o/frontend-js-aui-web/aui/attribute-extras/attribute-extras-min.js&/o/frontend-js-aui-web/aui/event-custom-base/event-custom-base-min.js&/o/frontend-js-aui-web/aui/event-custom-complex/event-custom-complex-min.js&/o/frontend-js-aui-web/aui/oop/oop-min.js&/o/frontend-js-aui-web/aui/aui-base-lang/aui-base-lang-min.js&/o/frontend-js-aui-web/liferay/dependency.js&/o/frontend-js-aui-web/liferay/util.js&/o/frontend-js-web/liferay/dom_task_runner.js&/o/frontend-js-web/liferay/events.js&/o/frontend-js-web/liferay/lazy_load.js&/o/frontend-js-web/liferay/liferay.js&/o/frontend-js-web/liferay/global.bundle.js&/o/frontend-js-web/liferay/portlet.js&/o/frontend-js-web/liferay/workflow.js&/o/oauth2-provider-web/js/liferay.js236ms159ms30ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js168ms142ms21ms3rd
https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410577351&/o/frontend-js-jquery-web/jquery/jquery.min.js&/o/frontend-js-jquery-web/jquery/init.js&/o/frontend-js-jquery-web/jquery/ajax.js&/o/frontend-js-jquery-web/jquery/bootstrap.bundle.min.js&/o/frontend-js-jquery-web/jquery/collapsible_search.js&/o/frontend-js-jquery-web/jquery/fm.js&/o/frontend-js-jquery-web/jquery/form.js&/o/frontend-js-jquery-web/jquery/popper.min.js&/o/frontend-js-jquery-web/jquery/side_navigation.js91ms50ms21ms3rd
F
JS Bundles
Action
62 scripts, 345 KB unused
FIX
62 scripts, 345 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MLP...: 71 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-5BRF...: 63 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://web.ub.edu/combo?browserId=chrome&minifier...: 58 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://web.ub.edu/combo?browserId=chrome&minifier...: unminified — 10 KB could be saved
Warning::
https://web.ub.edu/combo?browserId=chrome&minifier...: 53 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 38 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 345 KB
345 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-MLPG24R176 KB71 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-5BRF8HTDBV&cx=c&gtm=4e64h1151 KB63 KB (42%)✓3rd
https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410577351&/o/frontend-js-jquery-web/jquery/jquery.min.js&/o/frontend-js-jquery-web/jquery/init.js&/o/frontend-js-jquery-web/jquery/ajax.js&/o/frontend-js-jquery-web/jquery/bootstrap.bundle.min.js&/o/frontend-js-jquery-web/jquery/collapsible_search.js&/o/frontend-js-jquery-web/jquery/fm.js&/o/frontend-js-jquery-web/jquery/form.js&/o/frontend-js-jquery-web/jquery/popper.min.js&/o/frontend-js-jquery-web/jquery/side_navigation.js77 KB58 KB (76%)✗3rd
https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410387027&/o/frontend-js-aui-web/aui/aui/aui-min.js&/o/frontend-js-aui-web/liferay/modules.js&/o/frontend-js-aui-web/liferay/aui_sandbox.js&/o/frontend-js-aui-web/aui/attribute-base/attribute-base-min.js&/o/frontend-js-aui-web/aui/attribute-complex/attribute-complex-min.js&/o/frontend-js-aui-web/aui/attribute-core/attribute-core-min.js&/o/frontend-js-aui-web/aui/attribute-observable/attribute-observable-min.js&/o/frontend-js-aui-web/aui/attribute-extras/attribute-extras-min.js&/o/frontend-js-aui-web/aui/event-custom-base/event-custom-base-min.js&/o/frontend-js-aui-web/aui/event-custom-complex/event-custom-complex-min.js&/o/frontend-js-aui-web/aui/oop/oop-min.js&/o/frontend-js-aui-web/aui/aui-base-lang/aui-base-lang-min.js&/o/frontend-js-aui-web/liferay/dependency.js&/o/frontend-js-aui-web/liferay/util.js&/o/frontend-js-web/liferay/dom_task_runner.js&/o/frontend-js-web/liferay/events.js&/o/frontend-js-web/liferay/lazy_load.js&/o/frontend-js-web/liferay/liferay.js&/o/frontend-js-web/liferay/global.bundle.js&/o/frontend-js-web/liferay/portlet.js&/o/frontend-js-web/liferay/workflow.js&/o/oauth2-provider-web/js/liferay.js108 KB53 KB (49%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://web.ub.edu/o/frontend-taglib-clay/__liferay__/exports/@clayui$core.js44 KB34 KB (78%)✓3rd
https://consent.cookiebot.com/88355e31-7fef-4d33-b6e9-f715351dd339/cc.js?renew=false&referer=web.ub.edu&dnt=false&init=false132 KB27 KB (21%)✓3rd
https://static.hotjar.com/c/hotjar-1859237.js?sv=76 KB—✓3rd
https://web.ub.edu/o/frontend-taglib-clay/__liferay__/exports/@clayui$shared.js13 KB—✓3rd
https://web.ub.edu/o/ub-theme/js/glider/glider.min.js3 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
Page Weight Inventory
Action
112 resources · 2.6 MB · 345 KB savings available
FIX
112 resources · 2.6 MB · 345 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
~345 KB of savings available
Warning::
111 third-party resources (100% of weight)
Info::
3 resources over 200KB
112 resources · 2.6 MiB · 111 third-party 1.6 MiB over 1MB target
Image 47% · 1.2 MiB
JavaScript 39% · 1.0 MiB
CSS 7% · 190.5 KiB
Font 5% · 146.0 KiB
Document 1% · 28.6 KiB
Other 0% · 1.5 KiB

~344.6 KiB of savings available

Remove unused JavaScript: 344.6 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
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://web.ub.edu/o/ub-theme/images/ico/Search.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web.ub.edu/documents/2685349/2686580/leru.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web.ub.edu/documents/2685349/2686580/xarxa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web.ub.edu/documents/2685349/2686580/hr.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web.ub.edu/documents/2685349/2686580/charm... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://web.ub.edu/o/adaptive-media/image/5228710/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 1.2 MB
0 oversized -0 KB
26 legacy format
6 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

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
3 fonts (146 KB)
PASS
3 fonts (146 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

146 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 9.1 s LCP 15.9 shttps://web.ub.edu/o/ub-theme/fonts/roboto/roboto_regular/Roboto-Regular.woff2Roboto-Regular.woff2 https://web.ub.edu/o/ub-theme/fonts/roboto/roboto_regular/Roboto-Regular.woff2 — 48.1 KiB — 59 ms — font-display: swaphttps://web.ub.edu/o/ub-theme/fonts/roboto/roboto_bold/Roboto-Bold.woff2Roboto-Bold.woff2 https://web.ub.edu/o/ub-theme/fonts/roboto/roboto_bold/Roboto-Bold.woff2 — 48.8 KiB — 63 ms — font-display: swaphttps://web.ub.edu/o/ub-theme/fonts/roboto/roboto_medium/Roboto-Medium.woff2Roboto-Medium.woff2 https://web.ub.edu/o/ub-theme/fonts/roboto/roboto_medium/Roboto-Medium.woff2 — 49.1 KiB — 63 ms — font-display: swap
Roboto-Regular.woff2 woff2 swap
Size 48 KB
Load time 59 ms
Start 512 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Bold.woff2 woff2 swap
Size 49 KB
Load time 63 ms
Start 512 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Medium.woff2 woff2 swap
Size 49 KB
Load time 63 ms
Start 513 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
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
112 requests over 3402ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 9.1 s LCP 15.9 shttps://ub.edu// https://ub.edu/ — 301 — 131 B — 44 ms — http/1.1https://web.ub.edu/web/ub/web.ub.edu/web/ub/ https://web.ub.edu/web/ub/ — 200 — 27.6 KiB — 198 ms — h2https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410577351&/o/frontend-js-jquery-web/jquery/jquery.min.js&/o/frontend-js-jquery-web/jquery/init.js&/o/frontend-js-jquery-web/jquery/ajax.js&/o/frontend-js-jquery-web/jquery/bootstrap.bundle.min.js&/o/frontend-js-jquery-web/jquery/collapsible_search.js&/o/frontend-js-jquery-web/jquery/fm.js&/o/frontend-js-jquery-web/jquery/form.js&/o/frontend-js-jquery-web/jquery/popper.min.js&/o/frontend-js-jquery-web/jquery/side_navigation.jsweb.ub.edu/combo?browserId=chrome&m... https://web.ub.edu/combo?browserId=chrome&minifierType=js&languageId=ca_ES&t=1776410577351&/o/frontend-js-jquery-web/jquery/jquery.min.js&/o/frontend-js-jquery-web/jquery/init.js&/o/frontend-js-jquery-web/jquery/ajax.js&/o/frontend-js-jquery-web/jquery/bootstrap.bundle.min.js&/o/frontend-js-jquery-web/jquery/collapsible_search.js&/o/frontend-js-jquery-web/jquery/fm.js&/o/frontend-js-jquery-web/jquery/form.js&/o/frontend-js-jquery-web/jquery/popper.min.js&/o/frontend-js-jquery-web/jquery/side_navigation.js — 200 — 77.2 KiB — 92 ms — h2https://web.ub.edu/o/ub-theme/css/clay.css?browserId=chrome&themeId=ub_WAR_ubtheme&minifierType=css&languageId=ca_ES&t=1776410440000web.ub.edu/o/ub-theme/css/clay.css?... https://web.ub.edu/o/ub-theme/css/clay.css?browserId=chrome&themeId=ub_WAR_ubtheme&minifierType=css&languageId=ca_ES&t=1776410440000 — 200 — 69.7 KiB — 43 ms — h2https://web.ub.edu/combo?browserId=chrome&minifierType=css&themeId=ub_WAR_ubtheme&languageId=ca_ES&com_liferay_asset_publisher_web_portlet_AssetPublisherPortlet_INSTANCE_asI2YGi88lQJ:%2Fo%2Fasset-publisher-web%2Fcss%2Fmain.css&com_liferay_commerce_product_asset_categories_navigation_web_internal_portlet_CPAssetCategoriesNavigationPortlet_INSTANCE_cpAssetCategoriesNavigationPortlet_navigation_menu:%2Fo%2Fcommerce-product-asset-categories-navigation-web%2Fcss%2Fmain.css&com_liferay_journal_content_web_portlet_JournalContentPortlet:%2Fo%2Fjournal-content-web%2Fcss%2Fmain.css&com_liferay_portal_search_web_search_bar_portlet_SearchBarPortlet_INSTANCE_templateSearch:%2Fo%2Fportal-search-web%2Fcss%2Fmain.css&com_liferay_product_navigation_product_menu_web_portlet_ProductMenuPortlet:%2Fo%2Fproduct-navigation-product-menu-web%2Fcss%2Fmain.css&com_liferay_product_navigation_user_personal_bar_web_portlet_ProductNavigationUserPersonalBarPortlet:%2Fo%2Fproduct-navigation-user-personal-bar-web%2Fcss%2Fmain.css&com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet:%2Fo%2Fsite-navigation-menu-web%2Fcss%2Fmain.css&t=1776410440000web.ub.edu/combo?browserId=chrome&m... 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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
100% of JavaScript execution is third-party
First-party Third-party 3670ms · 642KB · €19/mo
consent.cookiebot.com
Other
Costly
Execution 1064ms
Transfer 36 KB
Monthly Cost €6/mo
Unattributable
Other
Costly
Execution 642ms
Transfer 0 KB
Monthly Cost €3/mo
web.ub.edu
Other
Costly
Execution 594ms
Transfer 28 KB
Monthly Cost €3/mo
web.ub.edu
Other
Costly
Execution 338ms
Transfer 11 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 282ms
Transfer 176 KB
Unused 41%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 257ms
Transfer 151 KB
Unused 42%
Monthly Cost €1/mo
web.ub.edu
Other
Costly
Execution 236ms
Transfer 108 KB
Unused 49%
Monthly Cost €1/mo
Hotjar
Session Replay
Optional
Execution 168ms
Transfer 57 KB
Unused 67%
Monthly Cost €1/mo
web.ub.edu
Other
Optional
Execution 91ms
Transfer 77 KB
Unused 76%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • consent.cookiebot.com adds 1064ms and costs ~€6/month
  • Unattributable adds 642ms and costs ~€3/month
  • web.ub.edu adds 594ms and costs ~€3/month
  • web.ub.edu adds 338ms and costs ~€2/month
  • Google Tag Manager adds 282ms and costs ~€2/month
  • Google Tag Manager adds 257ms and costs ~€1/month
  • web.ub.edu adds 236ms and costs ~€1/month

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.

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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

consent.cookiebot.com takes 1064ms 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

Unattributable takes 642ms 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

web.ub.edu takes 594ms 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

web.ub.edu takes 338ms 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 282ms 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 257ms 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

web.ub.edu takes 236ms 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

67% of Hotjar'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

76% of web.ub.edu'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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