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https://usal.es

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
2
REVIEW
5
PASS
8
INFO
2

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

48
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
59
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
58
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.

3.92 s

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

50.45 s

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

396 ms

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

0.009

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

13.48 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.

52.12 s

Page Load Progression

491 ms
982 ms
1.5 s
2.0 s
2.5 s
2.9 s
3.4 s
3.9 s
Checks
17
8 PASS 5 REVIEW 2 FIX
F
Page Weight Budget
Action
11.2 MB transferred, 158 requests
FIX
11.2 MB transferred, 158 requests
Critical::
Page weighs 13.3 MB (11.2 MB transferred)
Warning::
Images are 10.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 10.0 MB
Warning::
JavaScript is 653 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 653 KB
Info::
Fonts are 313 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 313 KB
Warning::
158 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.3 g CO2 per page load
11.2 MB / 2.4 MB budget
11.2 MB transferred
158 requests
2.3 g CO2 per page load
Images 10.0 MiB 89%
JavaScript 652.6 KiB 6%
Fonts 313.4 KiB 3%
CSS 151.6 KiB 1%
Other 48.8 KiB 0%
HTML 23.2 KiB 0%
Other 15.8 KiB 0%
Other 833 B 0%
Other 552 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

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
JS Execution Cost
Action
2673ms total JS execution
FIX
2673ms total JS execution
Warning::
https://usal.es/: 702ms CPU time
Warning::
Unattributable: 611ms CPU time
Warning::
https://usal.es/sites/all/modules/contrib/jquery_u...: 580ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-FV1P...: 220ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-J6GB...: 189ms CPU time
Info::
Third-party scripts: 1260ms (47% of total)

Main Thread Breakdown

Script Evaluation 36% Other 34% Style & Layout 15% Parse HTML & CSS 6% Script Parsing & Compilation 6% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://usal.es/702ms8ms4ms1st
Unattributable611ms6ms0ms3rd
https://usal.es/sites/all/modules/contrib/jquery_update/replace/jquery/1.7/jquery.min.js?v=1.7.2580ms384ms8ms1st
https://www.googletagmanager.com/gtag/js?id=G-FV1PMJH0R9&cx=c&gtm=4e64k1220ms179ms39ms3rd
https://www.googletagmanager.com/gtag/js?id=G-J6GBF0VEHC&cx=c&_slc=1189ms153ms35ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PBSQRX6151ms123ms27ms3rd
https://usal.es/sites/all/themes/momentum/js/retina.min.js?tcelcq131ms44ms0ms1st
https://eventum.usal.es/js/lib/vendor/jquery-1.9.1.min.js89ms71ms6ms3rd
C
Image Optimization
Action
41 images, 0 KB saveable
REVIEW
41 images, 0 KB saveable
Warning::
https://usal.es/files/glazed-builder/pequena_web_p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/pequena_web_c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/datos-ofertaa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/becas-ayudas-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/agencia-gesti... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/ediciones.jpg... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/cultura-cient... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/img_eventum_p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/datos-investi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/asociaciones-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/hrs4r_1.jpg?f... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/marca-quinto-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/datos-instala... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/actividades-c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/deportes.jpg?... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/asuntos-socia... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/colegios-resi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/orientacion-a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/produccion-ci... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/bibliotecas.j... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/nucleus.jpg?f... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/sites/all/themes/momentum/images/u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/grande_web_sc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/pequena_web_e... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/innovacion-em... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/oficina-proye... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/propiedad-int... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/pequena_web_a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/donasangre.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/idiomas.jpg?f... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/movilidad-int... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/formacion-per... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://usal.es/files/glazed-builder/empleo-empren... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
41 images 10.0 MB
0 oversized -0 KB
41 legacy format
33 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

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
30 scripts, 193 KB unused
REVIEW
30 scripts, 193 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-FV1P...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-J6GB...: 63 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PBS...: 62 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 193 KB
193 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-FV1PMJH0R9&cx=c&gtm=4e64k1169 KB68 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-J6GBF0VEHC&cx=c&_slc=1150 KB63 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PBSQRX6129 KB62 KB (48%)✓3rd
https://usal.es/sites/all/themes/momentum/bootstrap/js/bootstrap.min.js?tcelcq7 KB—✓1st
https://usal.es/sites/all/themes/momentum/js/jquery.fitvids.js?tcelcq2 KB—✓1st
https://usal.es/sites/all/modules/contrib/eu_cookie_compliance/js/jquery.cookie-1.4.1.min.js?v=1.4.11 KB—✓1st
https://usal.es/sites/all/modules/contrib/glazed_builder/glazed_builder/vendor/underscore/underscore-min.js?tcelcq6 KB—✓1st
https://usal.es/files/languages/es_IdwIoC6PscKbqj9PRTV201wVOQp1W1H_Glco__weJIo.js?tcelcq3 KB—✓1st
https://usal.es/sites/all/modules/contrib/tabvn/flexslider_format/js/jquery.flexslider.js?tcelcq9 KB—✗1st
https://usal.es/sites/all/modules/contrib/google_analytics/googleanalytics.js?tcelcq2 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
Page Weight Inventory
Action
158 resources · 11.2 MB · 193 KB savings available
REVIEW
158 resources · 11.2 MB · 193 KB savings available
Warning::
Page weight 10.2 MB over 1MB target
Got: 11.2 MB Expected: ≤ 1 MB
Info::
~193 KB of savings available
Info::
24 third-party resources (8% of weight)
Info::
12 resources over 200KB
158 resources · 11.2 MiB · 24 third-party 10.2 MiB over 1MB target
Image 90% · 10.1 MiB
JavaScript 6% · 652.6 KiB
Font 3% · 313.4 KiB
CSS 1% · 151.6 KiB
Document 0% · 39.1 KiB
Other 0% · 1.8 KiB

~193.1 KiB of savings available

Remove unused JavaScript: 193.1 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache, must-revalidate
REVIEW
no-cache, must-revalidate
Info::
Cache-Control header is set
Got: no-cache, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, must-revalidate

DirectiveValueMeaning
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
A+
Third-Party Impact
8% third-party, 0 ms blocking
PASS
8% third-party, 0 ms blocking
Info::
Third-party code accounts for 8% of page weight (866.1 KiB of 11.2 MiB)
Info::
Third-party blocking time is low (0 ms)
92%
First-party Third-party
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 (313 KB)
PASS
5 fonts (313 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

313 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 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 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s FCP 3.9 s LCP 50.5 shttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/webfonts/fa-solid-900.woff2 — 154.2 KiB — 101 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2S6uyw4BMUTPHjx4wXiWtFCc... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2 — 13.7 KiB — 34 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh50XSwiPGQ3q5d0.woff2S6u9w4BMUTPHh50XSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh50XSwiPGQ3q5d0.woff2 — 13.4 KiB — 45 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/webfonts/fa-brands-400.woff2 — 116.0 KiB — 113 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFOMCnqEu92Fr1ME7kSn66aGLdTylUAMQXC89YmC2DPNWubEbVmUiAr0lFQm.woff2KFOMCnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFOMCnqEu92Fr1ME7kSn66aGLdTylUAMQXC89YmC2DPNWubEbVmUiAr0lFQm.woff2 — 16.0 KiB — 29 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 154 KB
Load time 101 ms
Start 2.9 s
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
S6uyw4BMUTPHjx4wXiWtFCc... woff2 swap
Size 14 KB
Load time 34 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
S6u9w4BMUTPHh50XSwiPGQ3... woff2 swap
Size 13 KB
Load time 45 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 113 ms
Start 2.9 s
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
KFOMCnqEu92Fr1ME7kSn66a... woff2 swap
Size 16 KB
Load time 29 ms
Start 4.6 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~135 KB and ~270 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
158 requests over 4886ms
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 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s FCP 3.9 s LCP 50.5 shttps://usal.es// https://usal.es/ — 200 — 21.2 KiB — 1.7 s — http/1.1https://usal.es/sites/all/themes/momentum/css/fonts/raleway.css/sites/all/themes/momentum/css/font... https://usal.es/sites/all/themes/momentum/css/fonts/raleway.css — 200 — 798 B — 17 ms — http/1.1https://usal.es/sites/all/themes/momentum/css/fonts/OpenSans.css/sites/all/themes/momentum/css/font... https://usal.es/sites/all/themes/momentum/css/fonts/OpenSans.css — 200 — 1.1 KiB — 17 ms — http/1.1https://use.fontawesome.com/releases/v5.8.1/css/all.cssuse.fontawesome.com/releases/v5.8.1... https://use.fontawesome.com/releases/v5.8.1/css/all.css — 200 — 13.0 KiB — 84 ms — h2https://usal.es/modules/system/system.base.css?tcelcq/modules/system/system.base.css?tce... https://usal.es/modules/system/system.base.css?tcelcq — 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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
47% of JavaScript execution is third-party
First-party Third-party 1260ms · 484KB · €14/mo
Unattributable
Other
Costly
Execution 611ms
Transfer 0 KB
Monthly Cost €7/mo
Google Tag Manager
Tag Manager
Costly
Execution 220ms
Transfer 169 KB
Unused 40%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 189ms
Transfer 150 KB
Unused 42%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 151ms
Transfer 129 KB
Unused 48%
Monthly Cost €2/mo
eventum.usal.es
Other
Optional
Execution 89ms
Transfer 35 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 611ms and costs ~€7/month
  • Google Tag Manager adds 220ms and costs ~€2/month

47% 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

Unattributable takes 611ms 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 220ms 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

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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