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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
48
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
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.
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.

2.81 s

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

16.95 s

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

91 ms

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

0.579

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

2.81 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.

17.47 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 4 REVIEW 4 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 44 requests
FIX
4.7 MB transferred, 44 requests
Critical::
Page weighs 5.4 MB (4.7 MB transferred)
Warning::
Images are 4.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.2 MB
Info::
44 HTTP requests
Info::
Estimated 0.98 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
44 requests
0.98 g CO2 per page load
Images 4.2 MiB 89%
JavaScript 337.5 KiB 7%
Fonts 110.6 KiB 2%
CSS 30.7 KiB 1%
Other 15.4 KiB 0%
HTML 6.6 KiB 0%
Other 546 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

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 (4.7 MiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
44 resources · 4.7 MB · 145 KB savings available
FIX
44 resources · 4.7 MB · 145 KB savings available
Warning::
Page weight 3.7 MB over 1MB target
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~145 KB of savings available
Warning::
43 third-party resources (100% of weight)
Info::
5 resources over 200KB
44 resources · 4.7 MiB · 43 third-party 3.7 MiB over 1MB target
Image 90% · 4.2 MiB
JavaScript 7% · 337.5 KiB
Font 2% · 110.6 KiB
CSS 1% · 30.7 KiB
Document 0% · 6.9 KiB
Other 0% · 546 B

~145.1 KiB of savings available

Remove unused JavaScript: 145.1 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
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Warning::
https://www.upm.es/gsfs/SFS07562 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/gsfs/SFS07571 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/themes/comun/img/crue20.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/themes/comun/img/hrs4r.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/gsfs/SFS07573 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/gsfs/SFS47926 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/gsfs/SFS47882 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/themes/comun/img/icon_pv.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/gsfs/SFS07572 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/themes/comun/img/logo_intranet.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/themes/comun/img/universia15.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/gsfs/SFS48149 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/gsfs/SFS47783 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/themes/comun/img/icon_UPMdrive.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/themes/comun/img/prtr-02.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upm.es/themes/comun/logos/instituciona... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
25 images 4.2 MB
0 oversized -0 KB
25 legacy format
16 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

B
JS Execution Cost
925ms total JS execution
REVIEW
925ms total JS execution
Warning::
Unattributable: 315ms CPU time
Warning::
https://www.upm.es/: 259ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=UA-108...: 153ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-1KKR...: 134ms CPU time
Info::
https://www.upm.es/themes/comun/js/jquery-1.11.1.m...: 65ms CPU time
Warning::
Third-party scripts: 925ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Other 29% Style & Layout 17% Script Parsing & Compilation 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable315ms69ms0ms3rd
https://www.upm.es/259ms3ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-10874068-3153ms127ms25ms3rd
https://www.googletagmanager.com/gtag/js?id=G-1KKRJP23DJ&cx=c&gtm=4e64h1134ms101ms32ms3rd
https://www.upm.es/themes/comun/js/jquery-1.11.1.min.js65ms52ms7ms3rd
B
JS Bundles
6 scripts, 145 KB unused
REVIEW
6 scripts, 145 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-108...: 64 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-1KKR...: 62 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.upm.es/themes/comun/js/jquery-1.11.1.m...: 20 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 145 KB
145 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=UA-10874068-3125 KB64 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-1KKRJP23DJ&cx=c&gtm=4e64h1148 KB62 KB (41%)✓3rd
https://www.upm.es/themes/comun/js/jquery-1.11.1.min.js33 KB20 KB (62%)✓3rd
https://www.upm.es/themes/comun/js/bootstrap.min.js9 KB—✓3rd
https://www.upm.es/themes/comun/js/upm.min.js1 KB—✓3rd
https://www.google-analytics.com/analytics.js21 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

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
4 fonts (111 KB)
PASS
4 fonts (111 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

111 KB total

Render-blocking

0

of 4

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 2.8 s LCP 17.0 shttps://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2S6uyw4BMUTPHjx4wXiWtFCc... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2 — 13.7 KiB — 29 ms — font-display: swaphttps://www.upm.es/themes/comun/fonts/fontawesome-webfont.woff2?v=4.6.3fontawesome-webfont.woff2 https://www.upm.es/themes/comun/fonts/fontawesome-webfont.woff2?v=4.6.3 — 69.4 KiB — 8 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2S6u9w4BMUTPHh7USSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2 — 13.6 KiB — 33 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2S6u9w4BMUTPHh6UVSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2 — 13.9 KiB — 40 ms — font-display: swap
S6uyw4BMUTPHjx4wXiWtFCc... woff2 swap
Size 14 KB
Load time 29 ms
Start 235 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 woff2 swap
Size 69 KB
Load time 8 ms
Start 238 ms
Risk FOUT — text flashes from fallback to web font
S6u9w4BMUTPHh7USSwiPGQ3... woff2 swap
Size 14 KB
Load time 33 ms
Start 238 ms
Risk FOUT — text flashes from fallback to web font
S6u9w4BMUTPHh6UVSwiPGQ3... woff2 swap
Size 14 KB
Load time 40 ms
Start 239 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
44 requests over 537ms
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 2.8 s LCP 17.0 shttps://upm.es// https://upm.es/ — 302 — 293 B — 20 ms — http/1.1https://www.upm.es/www.upm.es/ https://www.upm.es/ — 200 — 6.6 KiB — 37 ms — http/1.1https://www.upm.es/themes/comun/css/bootstrap.min.csswww.upm.es/themes/comun/css/bootstr... https://www.upm.es/themes/comun/css/bootstrap.min.css — 200 — 18.1 KiB — 21 ms — http/1.1https://www.upm.es/themes/comun/css/font-awesome.min.csswww.upm.es/themes/comun/css/font-aw... https://www.upm.es/themes/comun/css/font-awesome.min.css — 200 — 6.9 KiB — 13 ms — http/1.1https://www.upm.es/themes/comun/css/style.css?20240930www.upm.es/themes/comun/css/style.c... https://www.upm.es/themes/comun/css/style.css?20240930 — 200 — 3.8 KiB — 16 ms — http/1.1https://www.upm.es/themes/comun/js/jquery-1.11.1.min.jswww.upm.es/themes/comun/js/jquery-1... https://www.upm.es/themes/comun/js/jquery-1.11.1.min.js — 200 — 32.8 KiB — 24 ms — http/1.1https://www.upm.es/themes/comun/js/bootstrap.min.jswww.upm.es/themes/comun/js/bootstra... https://www.upm.es/themes/comun/js/bootstrap.min.js — 200 — 8.7 KiB — 18 ms — http/1.1https://www.upm.es/themes/comun/js/upm.min.jswww.upm.es/themes/comun/js/upm.min.... https://www.upm.es/themes/comun/js/upm.min.js — 200 — 1.3 KiB — 16 ms — http/1.1https://www.upm.es/themes/comun/logos/institucional.pngwww.upm.es/themes/comun/logos/insti... https://www.upm.es/themes/comun/logos/institucional.png — 200 — 13.0 KiB — 13 ms — http/1.1https://www.upm.es/themes/comun/logos/eelisa2024.pngwww.upm.es/themes/comun/logos/eelis... https://www.upm.es/themes/comun/logos/eelisa2024.png — 200 — 3.3 KiB — 7 ms — http/1.1https://fonts.googleapis.com/css?family=Lato:300,400,700,900,400italicfonts.googleapis.com/css?family=Lat... https://fonts.googleapis.com/css?family=Lato:300,400,700,900,400italic — 200 — 965 B — 93 ms — h2https://www.upm.es/themes/comun/logos/CrueConUcrania.pngwww.upm.es/themes/comun/logos/CrueC... https://www.upm.es/themes/comun/logos/CrueConUcrania.png — 200 — 4.6 KiB — 5 ms — http/1.1https://www.upm.es/gsfs/SFS47282www.upm.es/gsfs/SFS47282 https://www.upm.es/gsfs/SFS47282 — 200 — 477.3 KiB — 31 ms — http/1.1https://www.upm.es/gsfs/SFS47808www.upm.es/gsfs/SFS47808 https://www.upm.es/gsfs/SFS47808 — 200 — 1.0 MiB — 54 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=UA-10874068-3www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-10874068-3 — 200 — 125.3 KiB — 150 ms — h2https://www.upm.es/gsfs/SFS47778www.upm.es/gsfs/SFS47778 https://www.upm.es/gsfs/SFS47778 — 200 — 160.8 KiB — 25 ms — http/1.1https://www.upm.es/gsfs/SFS47020www.upm.es/gsfs/SFS47020 https://www.upm.es/gsfs/SFS47020 — 200 — 434.3 KiB — 32 ms — http/1.1https://www.upm.es/gsfs/SFS45069www.upm.es/gsfs/SFS45069 https://www.upm.es/gsfs/SFS45069 — 200 — 157.5 KiB — 37 ms — http/1.1https://www.upm.es/gsfs/SFS47080www.upm.es/gsfs/SFS47080 https://www.upm.es/gsfs/SFS47080 — 200 — 767.8 KiB — 159 ms — http/1.1https://www.upm.es/gsfs/SFS45081www.upm.es/gsfs/SFS45081 https://www.upm.es/gsfs/SFS45081 — 200 — 739.9 KiB — 83 ms — http/1.1https://www.upm.es/gsfs/SFS07572www.upm.es/gsfs/SFS07572 https://www.upm.es/gsfs/SFS07572 — 200 — 5.4 KiB — 43 ms — http/1.1https://www.upm.es/gsfs/SFS07562www.upm.es/gsfs/SFS07562 https://www.upm.es/gsfs/SFS07562 — 200 — 11.9 KiB — 142 ms — http/1.1https://www.upm.es/gsfs/SFS07571www.upm.es/gsfs/SFS07571 https://www.upm.es/gsfs/SFS07571 — 200 — 5.2 KiB — 67 ms — http/1.1https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2fonts.gstatic.com/s/lato/v25/S6uyw4... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2 — 200 — 13.7 KiB — 29 ms — h3https://www.upm.es/themes/comun/fonts/fontawesome-webfont.woff2?v=4.6.3www.upm.es/themes/comun/fonts/fonta... https://www.upm.es/themes/comun/fonts/fontawesome-webfont.woff2?v=4.6.3 — 200 — 69.4 KiB — 8 ms — http/1.1https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2fonts.gstatic.com/s/lato/v25/S6u9w4... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2 — 200 — 13.6 KiB — 33 ms — h3https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2fonts.gstatic.com/s/lato/v25/S6u9w4... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2 — 200 — 13.9 KiB — 40 ms — h3https://www.upm.es/gsfs/SFS07573www.upm.es/gsfs/SFS07573 https://www.upm.es/gsfs/SFS07573 — 200 — 25.5 KiB — 44 ms — http/1.1https://www.upm.es/gsfs/SFS48149www.upm.es/gsfs/SFS48149 https://www.upm.es/gsfs/SFS48149 — 200 — 91.5 KiB — 36 ms — http/1.1https://www.upm.es/gsfs/SFS47926www.upm.es/gsfs/SFS47926 https://www.upm.es/gsfs/SFS47926 — 200 — 86.7 KiB — 50 ms — http/1.1
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 2.8 s LCP 17.0 shttps://upm.es// https://upm.es/ — 302 — 293 B — 20 ms — http/1.1https://www.upm.es/www.upm.es/ https://www.upm.es/ — 200 — 6.6 KiB — 37 ms — http/1.1https://www.upm.es/themes/comun/css/bootstrap.min.csswww.upm.es/themes/comun/css/bootstr... https://www.upm.es/themes/comun/css/bootstrap.min.css — 200 — 18.1 KiB — 21 ms — http/1.1https://www.upm.es/themes/comun/css/font-awesome.min.csswww.upm.es/themes/comun/css/font-aw... https://www.upm.es/themes/comun/css/font-awesome.min.css — 200 — 6.9 KiB — 13 ms — http/1.1https://www.upm.es/themes/comun/css/style.css?20240930www.upm.es/themes/comun/css/style.c... https://www.upm.es/themes/comun/css/style.css?20240930 — 200 — 3.8 KiB — 16 ms — http/1.1https://www.upm.es/themes/comun/js/jquery-1.11.1.min.jswww.upm.es/themes/comun/js/jquery-1... https://www.upm.es/themes/comun/js/jquery-1.11.1.min.js — 200 — 32.8 KiB — 24 ms — http/1.1https://www.upm.es/themes/comun/js/bootstrap.min.jswww.upm.es/themes/comun/js/bootstra... https://www.upm.es/themes/comun/js/bootstrap.min.js — 200 — 8.7 KiB — 18 ms — http/1.1https://www.upm.es/themes/comun/js/upm.min.jswww.upm.es/themes/comun/js/upm.min.... https://www.upm.es/themes/comun/js/upm.min.js — 200 — 1.3 KiB — 16 ms — http/1.1https://www.upm.es/themes/comun/logos/institucional.pngwww.upm.es/themes/comun/logos/insti... https://www.upm.es/themes/comun/logos/institucional.png — 200 — 13.0 KiB — 13 ms — http/1.1https://www.upm.es/themes/comun/logos/eelisa2024.pngwww.upm.es/themes/comun/logos/eelis... https://www.upm.es/themes/comun/logos/eelisa2024.png — 200 — 3.3 KiB — 7 ms — http/1.1https://fonts.googleapis.com/css?family=Lato:300,400,700,900,400italicfonts.googleapis.com/css?family=Lat... https://fonts.googleapis.com/css?family=Lato:300,400,700,900,400italic — 200 — 965 B — 93 ms — 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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 925ms · 313KB · €10/mo
Unattributable
Other
Costly
Execution 315ms
Transfer 0 KB
Monthly Cost €3/mo
www.upm.es
Other
Costly
Execution 259ms
Transfer 7 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 153ms
Transfer 125 KB
Unused 51%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 134ms
Transfer 148 KB
Unused 41%
Monthly Cost €1/mo
www.upm.es
Other
Optional
Execution 65ms
Transfer 33 KB
Unused 62%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 315ms and costs ~€3/month
  • www.upm.es adds 259ms 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

Unattributable takes 315ms 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.upm.es takes 259ms 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

51% 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

62% of www.upm.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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