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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
66
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.29 s

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

16.28 s

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

48 ms

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

0.002

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

2.52 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.

16.32 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
18.1 MB transferred, 97 requests
FIX
18.1 MB transferred, 97 requests
Critical::
Page weighs 20.5 MB (18.1 MB transferred)
Warning::
Images are 15.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 15.8 MB
Info::
Fonts are 1.5 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.5 MB
Warning::
JavaScript is 503 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 503 KB
Info::
97 HTTP requests
Info::
Estimated 3.8 g CO2 per page load
18.1 MB / 2.4 MB budget
18.1 MB transferred
97 requests
3.8 g CO2 per page load
Images 15.8 MiB 87%
Fonts 1.5 MiB 8%
JavaScript 502.9 KiB 3%
CSS 191.0 KiB 1%
HTML 53.4 KiB 0%
Other 15.2 KiB 0%
Other 548 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

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

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

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 (18.1 MiB of 18.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
97 resources · 18.1 MB · 150 KB savings available
FIX
97 resources · 18.1 MB · 150 KB savings available
Warning::
Page weight 17.1 MB over 1MB target
Got: 18.1 MB Expected: ≤ 1 MB
Info::
~150 KB of savings available
Warning::
96 third-party resources (100% of weight)
Info::
9 resources over 200KB
97 resources · 18.1 MiB · 96 third-party 17.1 MiB over 1MB target
Image 87% · 15.8 MiB
Font 8% · 1.5 MiB
JavaScript 3% · 502.9 KiB
CSS 1% · 191.0 KiB
Document 0% · 53.6 KiB
Other 0% · 548 B

~150.5 KiB of savings available

Remove unused JavaScript: 150.5 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.

B
Image Optimization
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
https://www.ulisboa.pt/themes/custom/ulisboa/logo.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 15.8 MB
0 oversized -0 KB
14 legacy format
1 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

B
JS Execution Cost
881ms total JS execution
REVIEW
881ms total JS execution
Warning::
https://www.ulisboa.pt/: 330ms CPU time
Info::
https://www.ulisboa.pt/core/misc/drupal.init.js?v=...: 187ms CPU time
Info::
https://www.ulisboa.pt/core/assets/vendor/jquery/j...: 172ms CPU time
Info::
Unattributable: 131ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-KMHQ...: 60ms CPU time
Warning::
Third-party scripts: 881ms (100% of total)

Main Thread Breakdown

Other 32% Style & Layout 29% Script Evaluation 24% Parse HTML & CSS 8% Rendering 4% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.ulisboa.pt/330ms2ms0ms3rd
https://www.ulisboa.pt/core/misc/drupal.init.js?v=10.4.6187ms107ms0ms3rd
https://www.ulisboa.pt/core/assets/vendor/jquery/jquery.min.js?v=3.7.1172ms28ms2ms3rd
Unattributable131ms3ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-KMHQQYRQSW60ms50ms10ms3rd
C
JS Bundles
Action
60 scripts, 150 KB unused
REVIEW
60 scripts, 150 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-423...: 65 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-KMHQ...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.addtoany.com/menu/modules/core.ydpp...: 21 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 150 KB
150 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=UA-42373371-1&cx=c&gtm=4e64k0116 KB65 KB (56%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-KMHQQYRQSW156 KB64 KB (41%)✓3rd
https://static.addtoany.com/menu/modules/core.ydpp7jcu.js26 KB21 KB (82%)✓3rd
https://www.ulisboa.pt/core/misc/drupalSettingsLoader.js?v=10.4.61 KB—✓3rd
https://www.ulisboa.pt/modules/contrib/google_tag/js/gtag.js?td48h31 KB—✓3rd
https://www.ulisboa.pt/core/assets/vendor/jquery/jquery.min.js?v=3.7.130 KB—✓3rd
https://www.ulisboa.pt/core/assets/vendor/once/once.min.js?v=1.0.11 KB—✓3rd
https://www.ulisboa.pt/sites/default/files/languages/pt-pt_m2TnLiYEoSZ5E7T-KGwHTKrAXzeId4A3Nnl8X0o03DQ.js?td48h35 KB—✓3rd
https://www.ulisboa.pt/core/misc/drupal.js?v=10.4.66 KB—✗3rd
https://www.ulisboa.pt/core/misc/drupal.init.js?v=10.4.61 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
10 fonts (1569 KB)
PASS
10 fonts (1569 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

1569 KB total

Render-blocking

0

of 10

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 1.3 s LCP 16.3 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://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2S6u9w4BMUTPHh6UVSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2 — 13.9 KiB — 41 ms — font-display: swaphttps://www.ulisboa.pt/libraries/fontawesome/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.ulisboa.pt/libraries/fontawesome/webfonts/fa-solid-900.woff2 — 320.4 KiB — 52 ms — font-display: swaphttps://fonts.gstatic.com/s/oswald/v57/TK3iWkUHHAIjg752GT8Gl-1PKw.woff2TK3iWkUHHAIjg752GT8Gl-1... https://fonts.gstatic.com/s/oswald/v57/TK3iWkUHHAIjg752GT8Gl-1PKw.woff2 — 27.8 KiB — 60 ms — font-display: swaphttps://www.ulisboa.pt/libraries/fontawesome/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.ulisboa.pt/libraries/fontawesome/webfonts/fa-regular-400.woff2 — 386.5 KiB — 64 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh50XSwiPGQ3q5d0.woff2S6u9w4BMUTPHh50XSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh50XSwiPGQ3q5d0.woff2 — 13.4 KiB — 46 ms — font-display: swaphttps://www.ulisboa.pt/libraries/fontawesome/webfonts/fa-light-300.woff2fa-light-300.woff2 https://www.ulisboa.pt/libraries/fontawesome/webfonts/fa-light-300.woff2 — 419.6 KiB — 91 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2S6u9w4BMUTPHh7USSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2 — 13.6 KiB — 31 ms — font-display: swaphttps://www.ulisboa.pt/libraries/fontawesome/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.ulisboa.pt/libraries/fontawesome/webfonts/fa-brands-400.woff2 — 108.6 KiB — 28 ms — font-display: swaphttps://www.ulisboa.pt/libraries/fontawesome/webfonts/fa-sharp-solid-900.woff2fa-sharp-solid-900.woff2 https://www.ulisboa.pt/libraries/fontawesome/webfonts/fa-sharp-solid-900.woff2 — 251.7 KiB — 60 ms — font-display: swap
S6uyw4BMUTPHjx4wXiWtFCc... woff2 swap
Size 14 KB
Load time 29 ms
Start 408 ms
Risk FOUT — text flashes from fallback to web font
S6u9w4BMUTPHh6UVSwiPGQ3... woff2 swap
Size 14 KB
Load time 41 ms
Start 411 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 320 KB
Load time 52 ms
Start 411 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
TK3iWkUHHAIjg752GT8Gl-1... woff2 swap
Size 28 KB
Load time 60 ms
Start 411 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 386 KB
Load time 64 ms
Start 412 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
S6u9w4BMUTPHh50XSwiPGQ3... woff2 swap
Size 13 KB
Load time 46 ms
Start 412 ms
Risk FOUT — text flashes from fallback to web font
fa-light-300.woff2 woff2 swap
Size 420 KB
Load time 91 ms
Start 412 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
S6u9w4BMUTPHh7USSwiPGQ3... woff2 swap
Size 14 KB
Load time 31 ms
Start 499 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 109 KB
Load time 28 ms
Start 500 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-sharp-solid-900.woff2 woff2 swap
Size 252 KB
Load time 60 ms
Start 500 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~743 KB and ~1486 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
97 requests over 1375ms
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 1.3 s LCP 16.3 shttps://ulisboa.pt// https://ulisboa.pt/ — 301 — 187 B — 64 ms — http/1.1http://www.ulisboa.pt/www.ulisboa.pt/ http://www.ulisboa.pt/ — 307 — 0 B — 1 ms — http/1.1https://www.ulisboa.pt/www.ulisboa.pt/ https://www.ulisboa.pt/ — 200 — 52.4 KiB — 110 ms — http/1.1https://www.ulisboa.pt/sites/default/files/css/css_dNQ-mfD9oHoyuu7m7l8q6N3kMbkTUS6h2t7Kp8zH5H0.css?delta=0&language=pt-pt&theme=ulisboa&include=eJyFUltywyAMvBCBIzECZJtGIA8SSd3TFyd9pHFm-gNiV97xrgQpKUPdHHwVdmpc1QSCj80RQ8p1NoFZRRusPkBrmV1qvIauyvXITdzKEZ2JA9BJdKOXirnAjH6intORLCgyaPGU50WPfOWEJp4xZeXmIUZuKXN1P9XdFdZkBoAuclm5YlWxz1qnU8Ha722p9RXIwhu8_wEe3GP3kfmc0e-alKFGdK9An3CCTmqm8SNwReGC7qG2Vwz7UwzBxl196JkSNqdLQ4xMXjDqsHLgr_yCTVkiX7BtbvgcvCkjHHCMJWCy-4hAFZu5A36f9j7sPZkyVJ5gv2v2gO7rNis0mEdoi3xn8ovYXtceKMuCyTSUkbTkC_o9V_f0tuWW9n9d31vzgCsEGvuSabh46D_dcCOU49kFkFFyzED-5n_sTz2LO0JWFyyjdxPFcv-uDweB4XlxLxmv4m6nLZw64Sdg4kwDwww.ulisboa.pt/sites/default/files/... https://www.ulisboa.pt/sites/default/files/css/css_dNQ-mfD9oHoyuu7m7l8q6N3kMbkTUS6h2t7Kp8zH5H0.css?delta=0&language=pt-pt&theme=ulisboa&include=eJyFUltywyAMvBCBIzECZJtGIA8SSd3TFyd9pHFm-gNiV97xrgQpKUPdHHwVdmpc1QSCj80RQ8p1NoFZRRusPkBrmV1qvIauyvXITdzKEZ2JA9BJdKOXirnAjH6intORLCgyaPGU50WPfOWEJp4xZeXmIUZuKXN1P9XdFdZkBoAuclm5YlWxz1qnU8Ha722p9RXIwhu8_wEe3GP3kfmc0e-alKFGdK9An3CCTmqm8SNwReGC7qG2Vwz7UwzBxl196JkSNqdLQ4xMXjDqsHLgr_yCTVkiX7BtbvgcvCkjHHCMJWCy-4hAFZu5A36f9j7sPZkyVJ5gv2v2gO7rNis0mEdoi3xn8ovYXtceKMuCyTSUkbTkC_o9V_f0tuWW9n9d31vzgCsEGvuSabh46D_dcCOU49kFkFFyzED-5n_sTz2LO0JWFyyjdxPFcv-uDweB4XlxLxmv4m6nLZw64Sdg4kwD — 200 — 102.9 KiB — 43 ms — http/1.1https://www.ulisboa.pt/sites/default/files/css/css_dJf5_NP-RMTLG2PWmDHXsgTe64i4ehbUoSDm8-QdpQM.css?delta=1&language=pt-pt&theme=ulisboa&include=eJyFUltywyAMvBCBIzECZJtGIA8SSd3TFyd9pHFm-gNiV97xrgQpKUPdHHwVdmpc1QSCj80RQ8p1NoFZRRusPkBrmV1qvIauyvXITdzKEZ2JA9BJdKOXirnAjH6intORLCgyaPGU50WPfOWEJp4xZeXmIUZuKXN1P9XdFdZkBoAuclm5YlWxz1qnU8Ha722p9RXIwhu8_wEe3GP3kfmc0e-alKFGdK9An3CCTmqm8SNwReGC7qG2Vwz7UwzBxl196JkSNqdLQ4xMXjDqsHLgr_yCTVkiX7BtbvgcvCkjHHCMJWCy-4hAFZu5A36f9j7sPZkyVJ5gv2v2gO7rNis0mEdoi3xn8ovYXtceKMuCyTSUkbTkC_o9V_f0tuWW9n9d31vzgCsEGvuSabh46D_dcCOU49kFkFFyzED-5n_sTz2LO0JWFyyjdxPFcv-uDweB4XlxLxmv4m6nLZw64Sdg4kwDwww.ulisboa.pt/sites/default/files/... https://www.ulisboa.pt/sites/default/files/css/css_dJf5_NP-RMTLG2PWmDHXsgTe64i4ehbUoSDm8-QdpQM.css?delta=1&language=pt-pt&theme=ulisboa&include=eJyFUltywyAMvBCBIzECZJtGIA8SSd3TFyd9pHFm-gNiV97xrgQpKUPdHHwVdmpc1QSCj80RQ8p1NoFZRRusPkBrmV1qvIauyvXITdzKEZ2JA9BJdKOXirnAjH6intORLCgyaPGU50WPfOWEJp4xZeXmIUZuKXN1P9XdFdZkBoAuclm5YlWxz1qnU8Ha722p9RXIwhu8_wEe3GP3kfmc0e-alKFGdK9An3CCTmqm8SNwReGC7qG2Vwz7UwzBxl196JkSNqdLQ4xMXjDqsHLgr_yCTVkiX7BtbvgcvCkjHHCMJWCy-4hAFZu5A36f9j7sPZkyVJ5gv2v2gO7rNis0mEdoi3xn8ovYXtceKMuCyTSUkbTkC_o9V_f0tuWW9n9d31vzgCsEGvuSabh46D_dcCOU49kFkFFyzED-5n_sTz2LO0JWFyyjdxPFcv-uDweB4XlxLxmv4m6nLZw64Sdg4kwD — 200 — 85.2 KiB — 70 ms — http/1.1https://www.ulisboa.pt/core/misc/drupalSettingsLoader.js?v=10.4.6www.ulisboa.pt/core/misc/drupalSett... https://www.ulisboa.pt/core/misc/drupalSettingsLoader.js?v=10.4.6 — 200 — 734 B — 41 ms — http/1.1https://www.ulisboa.pt/modules/contrib/google_tag/js/gtag.js?td48h3www.ulisboa.pt/modules/contrib/goog... 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http/1.1https://region1.google-analytics.com/g/collect?v=2&tid=G-KMHQQYRQSW&gtm=45je64k0v9116329000za200zd9116329000&_p=1776893014143&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&gdid=dMDhkMT&are=1&cid=137826699.1776893015&frm=0&pscdl=noapi&rcb=4&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266401~117512543&sid=1776893014&sct=1&seg=0&dl=https%3A%2F%2Fwww.ulisboa.pt%2F&dt=Universidade%20de%20Lisboa&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1141region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-KMHQQYRQSW&gtm=45je64k0v9116329000za200zd9116329000&_p=1776893014143&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&gdid=dMDhkMT&are=1&cid=137826699.1776893015&frm=0&pscdl=noapi&rcb=4&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266401~117512543&sid=1776893014&sct=1&seg=0&dl=https%3A%2F%2Fwww.ulisboa.pt%2F&dt=Universidade%20de%20Lisboa&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1141 — 204 — 548 B — 97 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-42373371-1&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-42373371-1&cx=c&gtm=4e64k0 — 200 — 115.6 KiB — 52 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 99 ms — h2https://www.ulisboa.pt/themes/custom/ulisboa/favicon.icowww.ulisboa.pt/themes/custom/ulisbo... https://www.ulisboa.pt/themes/custom/ulisboa/favicon.ico — 200 — 15.0 KiB — 19 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 881ms · 239KB · €10/mo
www.ulisboa.pt
Other
Costly
Execution 330ms
Transfer 52 KB
Monthly Cost €4/mo
www.ulisboa.pt
Other
Optional
Execution 187ms
Transfer 1 KB
Monthly Cost €2/mo
www.ulisboa.pt
Other
Optional
Execution 172ms
Transfer 30 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 131ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 60ms
Transfer 156 KB
Unused 41%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.ulisboa.pt adds 330ms and costs ~€4/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.ulisboa.pt takes 330ms 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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