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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

49
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.

5.12 s

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

8.32 s

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

540 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.

5.12 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.

13.02 s

Page Load Progression

1.1 s
2.2 s
3.3 s
4.4 s
5.6 s
6.7 s
7.8 s
8.9 s
Checks
17
7 PASS 3 REVIEW 5 FIX
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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6963ms total JS execution
FIX
6963ms total JS execution
Warning::
https://www.um.es/: 4385ms CPU time
Warning::
Unattributable: 855ms CPU time
Warning::
https://www.um.es/combo?browserId=chrome&minifierT...: 753ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-C35G...: 384ms CPU time
Warning::
https://cdnjs.cloudflare.com/ajax/libs/lottie-web/...: 257ms CPU time
Warning::
Third-party scripts: 6963ms (100% of total)

Main Thread Breakdown

Other 36% Style & Layout 25% Script Evaluation 21% Rendering 12%
ScriptTotalScriptingParse/CompileParty
https://www.um.es/4385ms36ms14ms3rd
Unattributable855ms194ms0ms3rd
https://www.um.es/combo?browserId=chrome&minifierType=js&languageId=es_ES&t=1773047466764&/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.js753ms609ms34ms3rd
https://www.googletagmanager.com/gtag/js?id=G-C35G871LG6&cx=c&gtm=4e64k1384ms202ms38ms3rd
https://cdnjs.cloudflare.com/ajax/libs/lottie-web/5.12.2/lottie.min.js257ms185ms20ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWBMMX193ms145ms38ms3rd
https://www.um.es/combo?browserId=chrome&minifierType=js&languageId=es_ES&t=1776826903794&/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.js135ms93ms27ms3rd
F
JS Bundles
Action
72 scripts, 335 KB unused
FIX
72 scripts, 335 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TWB...: 70 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-C35G...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.um.es/combo?browserId=chrome&minifierT...: 56 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.um.es/combo?browserId=chrome&minifierT...: unminified — 10 KB could be saved
Warning::
https://www.um.es/combo?browserId=chrome&minifierT...: 53 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdnjs.cloudflare.com/ajax/libs/lottie-web/...: 37 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 335 KB
335 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-TWBMMX140 KB70 KB (50%)3rd
https://www.googletagmanager.com/gtag/js?id=G-C35G871LG6&cx=c&gtm=4e64k1157 KB66 KB (42%)3rd
https://www.um.es/combo?browserId=chrome&minifierType=js&languageId=es_ES&t=1776826903794&/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 KB56 KB (73%)3rd
https://www.um.es/combo?browserId=chrome&minifierType=js&languageId=es_ES&t=1773047466764&/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.js110 KB53 KB (49%)3rd
https://cdnjs.cloudflare.com/ajax/libs/lottie-web/5.12.2/lottie.min.js63 KB37 KB (59%)3rd
https://www.um.es/o/frontend-taglib-clay/__liferay__/exports/@clayui$core.js39 KB31 KB (79%)3rd
https://cdn.datatables.net/1.10.11/js/jquery.dataTables.min.js?browserId=chrome&minifierType=js&languageId=es_ES&t=177684964000027 KB22 KB (84%)3rd
https://www.um.es/o/accessibility-settings-state-web/__liferay__/index.js1 KB3rd
https://www.um.es/o/frontend-js-react-web/__liferay__/exports/react.js4 KB3rd
https://www.um.es/o/um-lr-74-principal-theme/js/um_mobile_header.js?browserId=chrome&minifierType=js&languageId=es_ES&t=17768496400000 KB3rd

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
119 resources · 1.9 MB · 335 KB savings available
FIX
119 resources · 1.9 MB · 335 KB savings available
Warning::
Page weight 932 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~335 KB of savings available
Warning::
118 third-party resources (100% of weight)
119 resources · 1.9 MiB · 118 third-party 932.5 KiB over 1MB target
JavaScript 45% · 889.3 KiB
Image 31% · 596.9 KiB
Font 14% · 283.5 KiB
CSS 7% · 142.1 KiB
Document 2% · 32.6 KiB
Other 1% · 11.9 KiB

~335.2 KiB of savings available

Remove unused JavaScript: 335.2 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
Page Weight Budget
Action
1.9 MB transferred, 119 requests
REVIEW
1.9 MB transferred, 119 requests
Info::
Page weighs 5.6 MB (1.9 MB transferred)
Warning::
JavaScript is 889 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 889 KB
Info::
Fonts are 284 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 284 KB
Warning::
119 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.40 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
119 requests
0.40 g CO2 per page load
JavaScript 889.3 KiB 45%
Images 570.1 KiB 29%
Fonts 283.5 KiB 14%
CSS 142.1 KiB 7%
HTML 32.5 KiB 2%
Other 26.9 KiB 1%
Other 10.9 KiB 1%
Other 554 B 0%
Other 545 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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

C
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://www.um.es/o/um-lr-74-principal-theme/image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.um.es/o/um-lr-74-principal-theme/image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.um.es/documents/2192611/37956441/EUNIW... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.um.es/documents/2192611/37956441/cruec... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.um.es/o/um-lr-74-principal-theme/image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.um.es/documents/2192611/37956441/logo-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.um.es/o/um-lr-74-principal-theme/image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.um.es/documents/2192611/37956441/hr_b_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.um.es/documents/2192611/37956441/logo-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.um.es/o/um-lr-74-principal-theme/image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 570 KB
0 oversized -0 KB
22 legacy format
10 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

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
5 fonts (284 KB)
PASS
5 fonts (284 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

284 KB total

Render-blocking

0

of 5

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 5.1 s LCP 8.3 shttps://www.um.es/o/um-lr-74-principal-theme/fonts/IBMPlexSans-Regular.ttfIBMPlexSans-Regular.ttf https://www.um.es/o/um-lr-74-principal-theme/fonts/IBMPlexSans-Regular.ttf — 75.8 KiB — 332 ms — font-display: swaphttps://www.um.es/o/um-lr-74-principal-theme/fonts/IBMPlexSans-Medium.ttfIBMPlexSans-Medium.ttf https://www.um.es/o/um-lr-74-principal-theme/fonts/IBMPlexSans-Medium.ttf — 79.9 KiB — 350 ms — font-display: swaphttps://www.um.es/o/um-lr-74-principal-theme/fonts/FlechaM-RegularItalic.woff2FlechaM-RegularItalic.w... https://www.um.es/o/um-lr-74-principal-theme/fonts/FlechaM-RegularItalic.woff2 — 39.9 KiB — 362 ms — font-display: swaphttps://www.um.es/o/um-lr-74-principal-theme/fonts/FlechaM-Regular.woff2FlechaM-Regular.woff2 https://www.um.es/o/um-lr-74-principal-theme/fonts/FlechaM-Regular.woff2 — 38.5 KiB — 382 ms — font-display: swaphttps://www.um.es/o/um-lr-74-principal-theme/fonts/IBMPlexSansCondensed-SemiBold.ttfIBMPlexSansCondensed-Se... https://www.um.es/o/um-lr-74-principal-theme/fonts/IBMPlexSansCondensed-SemiBold.ttf — 49.5 KiB — 47 ms — font-display: swap
IBMPlexSans-Regular.ttf ttf swap
Size 76 KB
Load time 332 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
IBMPlexSans-Medium.ttf ttf swap
Size 80 KB
Load time 350 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
FlechaM-RegularItalic.w... woff2 swap
Size 40 KB
Load time 362 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
FlechaM-Regular.woff2 woff2 swap
Size 38 KB
Load time 382 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
IBMPlexSansCondensed-Se... ttf swap
Size 49 KB
Load time 47 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~62 KB and ~124 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
119 requests over 23303ms
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 18.0 s 20.0 s 22.0 s 24.0 s FCP 5.1 s LCP 8.3 shttps://um.es// https://um.es/ — 302 — 102 B — 83 ms — h2https://www.um.es/www.um.es/ https://www.um.es/ — 200 — 32.5 KiB — 309 ms — h2https://cdn.datatables.net/buttons/1.1.2/css/buttons.dataTables.min.css?browserId=chrome&themeId=umlr74principaltheme_WAR_umlr74principaltheme&minifierType=css&languageId=es_ES&t=1776849640000cdn.datatables.net/buttons/1.1.2/cs... https://cdn.datatables.net/buttons/1.1.2/css/buttons.dataTables.min.css?browserId=chrome&themeId=umlr74principaltheme_WAR_umlr74principaltheme&minifierType=css&languageId=es_ES&t=1776849640000 — 200 — 1.6 KiB — 107 ms — h2https://www.um.es/combo?browserId=chrome&minifierType=js&languageId=es_ES&t=1776826903794&/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.jswww.um.es/combo?browserId=chrome&mi... 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https://www.um.es/combo/?browserId=chrome&minifierType=&languageId=es_ES&t=1773047466764&/o/frontend-js-aui-web/aui/pluginhost-base/pluginhost-base-min.js&/o/frontend-js-aui-web/aui/pluginhost-config/pluginhost-config-min.js&/o/frontend-js-aui-web/aui/node-pluginhost/node-pluginhost-min.js&/o/frontend-js-aui-web/aui/dom-screen/dom-screen-min.js&/o/frontend-js-aui-web/aui/node-screen/node-screen-min.js&/o/frontend-js-aui-web/aui/node-style/node-style-min.js&/o/frontend-js-aui-web/aui/aui-node-base/aui-node-base-min.js&/o/frontend-js-aui-web/aui/aui-timer/aui-timer-min.js&/o/frontend-js-aui-web/aui/event-touch/event-touch-min.js&/o/frontend-js-aui-web/aui/event-synthetic/event-synthetic-min.js&/o/frontend-js-aui-web/aui/event-move/event-move-min.js — 200 — 10.5 KiB — 26 ms — h2https://www.um.es/o/um-lr-74-principal-theme/images/icons/arrow--up-right.svgwww.um.es/o/um-lr-74-principal-them... https://www.um.es/o/um-lr-74-principal-theme/images/icons/arrow--up-right.svg — 200 — 280 B — 35 ms — h2https://www.um.es/combo/?browserId=chrome&minifierType=&languageId=es_ES&t=1773047466764&/o/frontend-js-aui-web/liferay/portlet_url.jswww.um.es/combo/?browserId=chrome&m... https://www.um.es/combo/?browserId=chrome&minifierType=&languageId=es_ES&t=1773047466764&/o/frontend-js-aui-web/liferay/portlet_url.js — 200 — 1.8 KiB — 25 ms — h2https://www.um.es/combo/?browserId=chrome&minifierType=&languageId=es_ES&t=1773047466764&/o/frontend-js-aui-web/liferay/menu.jswww.um.es/combo/?browserId=chrome&m... https://www.um.es/combo/?browserId=chrome&minifierType=&languageId=es_ES&t=1773047466764&/o/frontend-js-aui-web/liferay/menu.js — 200 — 4.5 KiB — 25 ms — h2https://www.um.es/o/um-lr-74-principal-theme/js/components/um-lottie-loader.jswww.um.es/o/um-lr-74-principal-them... https://www.um.es/o/um-lr-74-principal-theme/js/components/um-lottie-loader.js — 200 — 4.4 KiB — 26 ms — h2https://www.um.es/combo/?browserId=chrome&minifierType=&languageId=es_ES&t=1773047466764&/o/frontend-js-aui-web/aui/widget-base/assets/skins/sam/widget-base.csswww.um.es/combo/?browserId=chrome&m... https://www.um.es/combo/?browserId=chrome&minifierType=&languageId=es_ES&t=1773047466764&/o/frontend-js-aui-web/aui/widget-base/assets/skins/sam/widget-base.css — 200 — 291 B — 41 ms — h2https://cdnjs.cloudflare.com/ajax/libs/lottie-web/5.12.2/lottie.min.jscdnjs.cloudflare.com/ajax/libs/lott... https://cdnjs.cloudflare.com/ajax/libs/lottie-web/5.12.2/lottie.min.js — 200 — 62.9 KiB — 88 ms — h3https://www.um.es/combo/?browserId=chrome&minifierType=&languageId=es_ES&t=1773047466764&/o/frontend-js-aui-web/aui/base-core/base-core-min.js&/o/frontend-js-aui-web/aui/base-observable/base-observable-min.js&/o/frontend-js-aui-web/aui/base-base/base-base-min.js&/o/frontend-js-aui-web/aui/base-pluginhost/base-pluginhost-min.js&/o/frontend-js-aui-web/aui/event-focus/event-focus-min.js&/o/frontend-js-aui-web/aui/widget-base/widget-base-min.js&/o/frontend-js-aui-web/aui/aui-widget-cssclass/aui-widget-cssclass-min.js&/o/frontend-js-aui-web/aui/aui-widget-toggle/aui-widget-toggle-min.js&/o/frontend-js-aui-web/aui/base-build/base-build-min.js&/o/frontend-js-aui-web/aui/aui-component/aui-component-min.js&/o/frontend-js-aui-web/aui/array-invoke/array-invoke-min.jswww.um.es/combo/?browserId=chrome&m... https://www.um.es/combo/?browserId=chrome&minifierType=&languageId=es_ES&t=1773047466764&/o/frontend-js-aui-web/aui/base-core/base-core-min.js&/o/frontend-js-aui-web/aui/base-observable/base-observable-min.js&/o/frontend-js-aui-web/aui/base-base/base-base-min.js&/o/frontend-js-aui-web/aui/base-pluginhost/base-pluginhost-min.js&/o/frontend-js-aui-web/aui/event-focus/event-focus-min.js&/o/frontend-js-aui-web/aui/widget-base/widget-base-min.js&/o/frontend-js-aui-web/aui/aui-widget-cssclass/aui-widget-cssclass-min.js&/o/frontend-js-aui-web/aui/aui-widget-toggle/aui-widget-toggle-min.js&/o/frontend-js-aui-web/aui/base-build/base-build-min.js&/o/frontend-js-aui-web/aui/aui-component/aui-component-min.js&/o/frontend-js-aui-web/aui/array-invoke/array-invoke-min.js — 200 — 7.5 KiB — 26 ms — h2https://www.um.es/combo/?browserId=chrome&minifierType=&languageId=es_ES&t=1773047466764&/o/frontend-js-aui-web/aui/cookie/cookie-min.js&/o/frontend-js-aui-web/aui/plugin/plugin-min.js&/o/frontend-js-aui-web/liferay/session.jswww.um.es/combo/?browserId=chrome&m... https://www.um.es/combo/?browserId=chrome&minifierType=&languageId=es_ES&t=1773047466764&/o/frontend-js-aui-web/aui/cookie/cookie-min.js&/o/frontend-js-aui-web/aui/plugin/plugin-min.js&/o/frontend-js-aui-web/liferay/session.js — 200 — 5.2 KiB — 26 ms — h2https://www.um.es/o/um-lr-74-principal-theme/images/animations/cruz-hover/cruz-hover.jsonwww.um.es/o/um-lr-74-principal-them... https://www.um.es/o/um-lr-74-principal-theme/images/animations/cruz-hover/cruz-hover.json — 200 — 849 B — 36 ms — h2https://www.um.es/o/um-lr-74-principal-theme/images/animations/header-logo/header-logo.jsonwww.um.es/o/um-lr-74-principal-them... https://www.um.es/o/um-lr-74-principal-theme/images/animations/header-logo/header-logo.json — 200 — 8.9 KiB — 59 ms — h2https://www.um.es/o/um-lr-74-principal-theme/images/favicon-corazon/favicon-corazon-UMU.icowww.um.es/o/um-lr-74-principal-them... https://www.um.es/o/um-lr-74-principal-theme/images/favicon-corazon/favicon-corazon-UMU.ico — 200 — 1021 B — 26 ms — h2https://www.um.es/o/um-lr-74-principal-theme/images/favicon-corazon/favicon-corazon-UMU.svg?v=3www.um.es/o/um-lr-74-principal-them... https://www.um.es/o/um-lr-74-principal-theme/images/favicon-corazon/favicon-corazon-UMU.svg?v=3 — 200 — 540 B — 46 ms — h2https://www.um.es/o/um-lr-74-principal-theme/images/favicon-corazon/favicon-corazon-UMU.ico?v=3www.um.es/o/um-lr-74-principal-them... https://www.um.es/o/um-lr-74-principal-theme/images/favicon-corazon/favicon-corazon-UMU.ico?v=3 — 200 — 1.0 KiB — 26 ms — h2
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 6963ms · 579KB · €76/mo
www.um.es
Other
Costly
Execution 4385ms
Transfer 33 KB
Monthly Cost €48/mo
Unattributable
Other
Costly
Execution 855ms
Transfer 0 KB
Monthly Cost €9/mo
www.um.es
Other
Costly
Execution 753ms
Transfer 110 KB
Unused 49%
Monthly Cost €8/mo
Google Tag Manager
Tag Manager
Costly
Execution 384ms
Transfer 157 KB
Unused 42%
Monthly Cost €4/mo
cdnjs
CDN
Costly
Execution 257ms
Transfer 63 KB
Unused 59%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 193ms
Transfer 140 KB
Unused 50%
Monthly Cost €2/mo
www.um.es
Other
Optional
Execution 135ms
Transfer 77 KB
Unused 73%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.um.es adds 4385ms and costs ~€48/month
  • Unattributable adds 855ms and costs ~€9/month
  • www.um.es adds 753ms and costs ~€8/month
  • Google Tag Manager adds 384ms and costs ~€4/month
  • cdnjs adds 257ms and costs ~€3/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.

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

www.um.es takes 4385ms 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 855ms 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

www.um.es takes 753ms 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 384ms 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

cdnjs 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

59% of cdnjs'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

50% of Google Tag Manager'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

73% of www.um.es'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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