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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
41
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
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.
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.

4.06 s

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

14.01 s

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

1.04 s

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

0.021

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

4.90 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.

14.42 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 3 REVIEW 5 FIX
F
Page Weight Budget
Action
6.9 MB transferred, 93 requests
FIX
6.9 MB transferred, 93 requests
Critical::
Page weighs 10.1 MB (6.9 MB transferred)
Warning::
Images are 5.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.9 MB
Warning::
JavaScript is 695 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 695 KB
Info::
93 HTTP requests
Info::
Estimated 1.4 g CO2 per page load
6.9 MB / 2.4 MB budget
6.9 MB transferred
93 requests
1.4 g CO2 per page load
Images 5.9 MiB 85%
JavaScript 695.0 KiB 10%
Fonts 181.6 KiB 3%
CSS 101.9 KiB 1%
Other 52.6 KiB 1%
Other 12.0 KiB 0%
HTML 10.6 KiB 0%
Other 2.7 KiB 0%
Other 0 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

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 (6.9 MiB of 6.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5482ms total JS execution
FIX
5482ms total JS execution
Warning::
https://www.ucd.ie/: 1486ms CPU time
Warning::
Unattributable: 1363ms CPU time
Warning::
https://www.juicer.io/embed.js: 1055ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P56...: 640ms CPU time
Warning::
https://cookie-cdn.cookiepro.com/scripttemplates/2...: 379ms CPU time
Warning::
Third-party scripts: 5482ms (100% of total)

Main Thread Breakdown

Script Evaluation 33% Other 31% Style & Layout 20% Script Parsing & Compilation 8% Rendering 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.ucd.ie/1486ms22ms4ms3rd
Unattributable1363ms115ms0ms3rd
https://www.juicer.io/embed.js1055ms600ms102ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P56RDT5640ms506ms119ms3rd
https://cookie-cdn.cookiepro.com/scripttemplates/202408.1.0/otBannerSdk.js379ms240ms69ms3rd
https://www.ucd.ie/t4media/app.min.js?v=0.0.1235ms189ms8ms3rd
https://cookie-cdn.cookiepro.com/consent/f638e53d-11c1-473f-aa7f-b47b6862f492/OtAutoBlock.js154ms53ms81ms3rd
https://www.ucd.ie/t4media/fancybox.umd.js?v=0.0.167ms15ms17ms3rd
https://www.ucd.ie/t4media/swiper-bundle.min.js?v=0.0.151ms19ms22ms3rd
https://www.ucd.ie/t4media/choices.min.js?v=0.0.150ms23ms27ms3rd
D
Page Weight Inventory
Action
93 resources · 6.9 MB · 287 KB savings available
FIX
93 resources · 6.9 MB · 287 KB savings available
Warning::
Page weight 5.9 MB over 1MB target
Got: 6.9 MB Expected: ≤ 1 MB
Info::
~287 KB of savings available
Warning::
92 third-party resources (100% of weight)
Info::
12 resources over 200KB
93 resources · 6.9 MiB · 92 third-party 5.9 MiB over 1MB target
Image 85% · 5.9 MiB
JavaScript 10% · 728.4 KiB
Font 3% · 181.6 KiB
CSS 2% · 106.6 KiB
Other 0% · 25.9 KiB
Document 0% · 10.7 KiB

~287.1 KiB of savings available

Remove unused JavaScript: 287.1 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
57 images, 0 KB saveable
REVIEW
57 images, 0 KB saveable
Warning::
https://www.juicer.io/api/media/28118118?s=5c65536... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/posts/507263320/images.j... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucd.ie/t4media/universitas-homepage-lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucd.ie/t4media/ucd-homepage-footer-aca... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/28322470?s=91bd06d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/28099288/video_thu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucd.ie/t4media/ucd-homepage-footer-gra... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucd.ie/t4media/ucd-homepage-footer-gra... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/28331582?s=5b5231a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucd.ie/t4media/ucd-homepage-footer-gra... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucd.ie/t4media/crest-ucd.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucd.ie/t4media/ASI-english-silver-colo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucd.ie/t4media/EUA-members-logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucd.ie/t4media/KeepWell-logo-white.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucd.ie/t4media/grid-overlay-footer.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/28369596?s=002d5c4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/28185316?s=791c6ce... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/28185206?s=1c63255... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
57 images 5.9 MB
0 oversized -0 KB
56 legacy format
18 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

C
JS Bundles
Action
13 scripts, 287 KB unused
REVIEW
13 scripts, 287 KB unused
Warning::
https://www.juicer.io/embed.js: 102 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P56...: 80 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cookie-cdn.cookiepro.com/scripttemplates/2...: 59 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ucd.ie/t4media/fancybox.umd.js?v=0.0.1: 24 KB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ucd.ie/t4media/swiper-bundle.min.js?v=...: 21 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 287 KB
287 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.juicer.io/embed.js152 KB102 KB (67%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P56RDT5203 KB80 KB (40%)✓3rd
https://cookie-cdn.cookiepro.com/scripttemplates/202408.1.0/otBannerSdk.js111 KB59 KB (54%)✓3rd
https://www.ucd.ie/t4media/fancybox.umd.js?v=0.0.129 KB24 KB (85%)✓3rd
https://www.ucd.ie/t4media/swiper-bundle.min.js?v=0.0.139 KB21 KB (55%)✓3rd
https://www.ucd.ie/t4media/choices.min.js?v=0.0.123 KB—✓3rd
https://cookie-cdn.cookiepro.com/consent/f638e53d-11c1-473f-aa7f-b47b6862f492/OtAutoBlock.js92 KB—✓3rd
https://www.ucd.ie/t4media/app.min.js?v=0.0.113 KB—✓3rd
https://www.juicer.io/embed/ucd-university-relations/embed-code.js?pages=1&per=81 KB—✓3rd
https://www.ucd.ie/t4media/bootstrap.bundle.min.js?v=0.0.123 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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

Source: web.dev / Lighthouse coverage

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
6 fonts (182 KB)
PASS
6 fonts (182 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

182 KB total

Render-blocking

0

of 6

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 FCP 4.1 s LCP 14.0 shttps://www.ucd.ie/t4media/Lato-Bold.woff2Lato-Bold.woff2 https://www.ucd.ie/t4media/Lato-Bold.woff2 — 28.7 KiB — 40 ms — font-display: swaphttps://www.ucd.ie/t4media/Lato-Regular.woff2Lato-Regular.woff2 https://www.ucd.ie/t4media/Lato-Regular.woff2 — 29.2 KiB — 34 ms — font-display: swaphttps://www.ucd.ie/t4media/Lato-Black.woff2Lato-Black.woff2 https://www.ucd.ie/t4media/Lato-Black.woff2 — 28.4 KiB — 44 ms — font-display: swaphttps://www.ucd.ie/t4media/la-brands-400.woff2la-brands-400.woff2 https://www.ucd.ie/t4media/la-brands-400.woff2 — 83.6 KiB — 49 ms — font-display: swaphttps://www.ucd.ie/t4media/icomoon.ttficomoon.ttf https://www.ucd.ie/t4media/icomoon.ttf — 2.1 KiB — 52 ms — font-display: swaphttps://assets.juicer.io/fonts/fontawesome-5-juicer.woff2?83361522fontawesome-5-juicer.woff2 https://assets.juicer.io/fonts/fontawesome-5-juicer.woff2?83361522 — 9.5 KiB — 30 ms — font-display: swap
Lato-Bold.woff2 woff2 swap
Size 29 KB
Load time 40 ms
Start 383 ms
Risk FOUT — text flashes from fallback to web font
Lato-Regular.woff2 woff2 swap
Size 29 KB
Load time 34 ms
Start 384 ms
Risk FOUT — text flashes from fallback to web font
Lato-Black.woff2 woff2 swap
Size 28 KB
Load time 44 ms
Start 384 ms
Risk FOUT — text flashes from fallback to web font
la-brands-400.woff2 woff2 swap
Size 84 KB
Load time 49 ms
Start 385 ms
Risk FOUT — text flashes from fallback to web font
icomoon.ttf ttf swap
Size 2 KB
Load time 52 ms
Start 385 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fontawesome-5-juicer.woff2 woff2 swap
Size 10 KB
Load time 30 ms
Start 1.5 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 ~1 KB and ~2 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
93 requests over 1712ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 4.1 s LCP 14.0 shttps://ucd.ie// https://ucd.ie/ — 301 — 82 B — 63 ms — h2https://www.ucd.ie/www.ucd.ie/ https://www.ucd.ie/ — 200 — 10.6 KiB — 43 ms — h2https://cookie-cdn.cookiepro.com/consent/f638e53d-11c1-473f-aa7f-b47b6862f492/OtAutoBlock.jscookie-cdn.cookiepro.com/consent/f6... https://cookie-cdn.cookiepro.com/consent/f638e53d-11c1-473f-aa7f-b47b6862f492/OtAutoBlock.js — 200 — 91.6 KiB — 43 ms — h2https://cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.jscookie-cdn.cookiepro.com/scripttemp... https://cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.js — 200 — 9.3 KiB — 27 ms — h2https://www.ucd.ie/t4media/main.min.css?v=0.0.1www.ucd.ie/t4media/main.min.css?v=0... https://www.ucd.ie/t4media/main.min.css?v=0.0.1 — 200 — 85.8 KiB — 31 ms — h2https://www.ucd.ie/t4media/crest-ucd.svgwww.ucd.ie/t4media/crest-ucd.svg https://www.ucd.ie/t4media/crest-ucd.svg — 200 — 7.7 KiB — 23 ms — h2https://www.ucd.ie/t4media/icon-union.svgwww.ucd.ie/t4media/icon-union.svg https://www.ucd.ie/t4media/icon-union.svg — 200 — 1.1 KiB — 85 ms — h2https://www.ucd.ie/t4media/icon-tiles.svgwww.ucd.ie/t4media/icon-tiles.svg https://www.ucd.ie/t4media/icon-tiles.svg — 200 — 948 B — 88 ms — h2https://cookie-cdn.cookiepro.com/consent/f638e53d-11c1-473f-aa7f-b47b6862f492/f638e53d-11c1-473f-aa7f-b47b6862f492.jsoncookie-cdn.cookiepro.com/consent/f6... https://cookie-cdn.cookiepro.com/consent/f638e53d-11c1-473f-aa7f-b47b6862f492/f638e53d-11c1-473f-aa7f-b47b6862f492.json — 200 — 2.3 KiB — 41 ms — h2https://www.ucd.ie/t4media/icon-search.svgwww.ucd.ie/t4media/icon-search.svg https://www.ucd.ie/t4media/icon-search.svg — 200 — 1.1 KiB — 137 ms — h2https://www.ucd.ie/t4media/UCDMasterscampaignhomepagebanner767x550.jpgwww.ucd.ie/t4media/UCDMasterscampai... https://www.ucd.ie/t4media/UCDMasterscampaignhomepagebanner767x550.jpg — 200 — 128.6 KiB — 181 ms — 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h2https://www.juicer.io/api/media/28331582?s=5b5231a6ef97696fbe559af097d0dc5bb6a3efc9www.juicer.io/api/media/28331582?s=... https://www.juicer.io/api/media/28331582?s=5b5231a6ef97696fbe559af097d0dc5bb6a3efc9 — 200 — 279.3 KiB — 85 ms — h2https://www.juicer.io/api/posts/507373283/poster_images.jpg?external_id=DXZFy61FULm&s=655ce9ec1534253d34fc272138c485e38c9b497cwww.juicer.io/api/posts/507373283/p... https://www.juicer.io/api/posts/507373283/poster_images.jpg?external_id=DXZFy61FULm&s=655ce9ec1534253d34fc272138c485e38c9b497c — 200 — 8.4 KiB — 83 ms — h2https://www.juicer.io/api/media/28322470?s=91bd06df2ae43cf223313e9892228a2478fba3edwww.juicer.io/api/media/28322470?s=... https://www.juicer.io/api/media/28322470?s=91bd06df2ae43cf223313e9892228a2478fba3ed — 200 — 275.7 KiB — 90 ms — h2https://www.juicer.io/api/posts/507311089/poster_images.jpg?external_id=university-college-dublin_7c20ba44a5f42f62faf54199eb34c584bb9bb447&s=71d395202fc7c8bf9db0e47e2ce6bc3b1f43b532www.juicer.io/api/posts/507311089/p... https://www.juicer.io/api/posts/507311089/poster_images.jpg?external_id=university-college-dublin_7c20ba44a5f42f62faf54199eb34c584bb9bb447&s=71d395202fc7c8bf9db0e47e2ce6bc3b1f43b532 — 200 — 5.0 KiB — 86 ms — h2https://www.juicer.io/api/media/28185316?s=791c6cee59c523a41221c260ec2acf7d8be93f81www.juicer.io/api/media/28185316?s=... https://www.juicer.io/api/media/28185316?s=791c6cee59c523a41221c260ec2acf7d8be93f81 — 200 — 105.4 KiB — 87 ms — h2https://www.juicer.io/api/posts/507311019/poster_images.jpg?external_id=DXPKYyNCH2Z&s=1a06fcd868637d4c82b78e0e2adb0831a4be418ewww.juicer.io/api/posts/507311019/p... https://www.juicer.io/api/posts/507311019/poster_images.jpg?external_id=DXPKYyNCH2Z&s=1a06fcd868637d4c82b78e0e2adb0831a4be418e — 200 — 8.7 KiB — 89 ms — h2https://www.juicer.io/api/media/28185206?s=1c6325523c758bf151323d4795df2a3c20762bdewww.juicer.io/api/media/28185206?s=... https://www.juicer.io/api/media/28185206?s=1c6325523c758bf151323d4795df2a3c20762bde — 200 — 1.1 MiB — 119 ms — h2https://www.juicer.io/api/posts/507281215/poster_images.jpg?external_id=university-college-dublin_dc58e1873c39baeb7b5c1245d7b01f8dd7b1ab28&s=62b83e41d8e3f2c3baac968ba9505462df2c6fa8www.juicer.io/api/posts/507281215/p... https://www.juicer.io/api/posts/507281215/poster_images.jpg?external_id=university-college-dublin_dc58e1873c39baeb7b5c1245d7b01f8dd7b1ab28&s=62b83e41d8e3f2c3baac968ba9505462df2c6fa8 — 200 — 4.9 KiB — 103 ms — h2https://www.juicer.io/api/media/28099288/video_thumbnail?s=0ff1437d6ac7fb5189d0e45de3b33b2387126ac8www.juicer.io/api/media/28099288/vi... https://www.juicer.io/api/media/28099288/video_thumbnail?s=0ff1437d6ac7fb5189d0e45de3b33b2387126ac8 — 200 — 38.8 KiB — 103 ms — h2https://www.juicer.io/api/posts/507263321/poster_images.jpg?external_id=university-college-dublin_9827f8444a11628f2bec0fa2eb638a724aed513d&s=19f508692d7a023c2fffd9f89e7cc1afd79e1017www.juicer.io/api/posts/507263321/p... https://www.juicer.io/api/posts/507263321/poster_images.jpg?external_id=university-college-dublin_9827f8444a11628f2bec0fa2eb638a724aed513d&s=19f508692d7a023c2fffd9f89e7cc1afd79e1017 — 200 — 4.9 KiB — 103 ms — h2https://www.juicer.io/api/media/28118118?s=5c6553666eb29900ca14dcf45924eddaaec9daddwww.juicer.io/api/media/28118118?s=... https://www.juicer.io/api/media/28118118?s=5c6553666eb29900ca14dcf45924eddaaec9dadd — 200 — 60.4 KiB — 104 ms — h2https://www.juicer.io/api/posts/507263320/poster_images.jpg?external_id=university-college-dublin_caead064a0ba897f8d9b46c4b20b868ebe24c411&s=05d946d52ae51946b9672c56127d0b64354edc59www.juicer.io/api/posts/507263320/p... https://www.juicer.io/api/posts/507263320/poster_images.jpg?external_id=university-college-dublin_caead064a0ba897f8d9b46c4b20b868ebe24c411&s=05d946d52ae51946b9672c56127d0b64354edc59 — 200 — 4.6 KiB — 100 ms — h2https://www.juicer.io/api/posts/507263320/images.jpg?external_id=university-college-dublin_caead064a0ba897f8d9b46c4b20b868ebe24c411&s=05d946d52ae51946b9672c56127d0b64354edc59www.juicer.io/api/posts/507263320/i... https://www.juicer.io/api/posts/507263320/images.jpg?external_id=university-college-dublin_caead064a0ba897f8d9b46c4b20b868ebe24c411&s=05d946d52ae51946b9672c56127d0b64354edc59 — 200 — 197.6 KiB — 107 ms — h2https://assets.juicer.io/fonts/fontawesome-5-juicer.woff2?83361522assets.juicer.io/fonts/fontawesome-... https://assets.juicer.io/fonts/fontawesome-5-juicer.woff2?83361522 — 200 — 9.5 KiB — 30 ms — h2https://www.juicer.io/api/page_viewswww.juicer.io/api/page_views https://www.juicer.io/api/page_views — 200 — 148 B — 123 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 5482ms · 672KB · €60/mo
www.ucd.ie
Other
Costly
Execution 1486ms
Transfer 11 KB
Monthly Cost €16/mo
Unattributable
Other
Costly
Execution 1363ms
Transfer 0 KB
Monthly Cost €15/mo
www.juicer.io
Other
Costly
Execution 1055ms
Transfer 152 KB
Unused 67%
Monthly Cost €11/mo
Google Tag Manager
Tag Manager
Costly
Execution 640ms
Transfer 203 KB
Unused 40%
Monthly Cost €7/mo
cookie-cdn.cookiepro.com
Other
Costly
Execution 379ms
Transfer 111 KB
Unused 54%
Monthly Cost €4/mo
www.ucd.ie
Other
Costly
Execution 235ms
Transfer 13 KB
Monthly Cost €3/mo
cookie-cdn.cookiepro.com
Other
Optional
Execution 154ms
Transfer 92 KB
Monthly Cost €2/mo
www.ucd.ie
Other
Optional
Execution 67ms
Transfer 29 KB
Unused 85%
Monthly Cost €1/mo
www.ucd.ie
Other
Optional
Execution 51ms
Transfer 39 KB
Unused 55%
Monthly Cost €1/mo
www.ucd.ie
Other
Optional
Execution 50ms
Transfer 23 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.ucd.ie adds 1486ms and costs ~€16/month
  • Unattributable adds 1363ms and costs ~€15/month
  • www.juicer.io adds 1055ms and costs ~€11/month
  • Google Tag Manager adds 640ms and costs ~€7/month
  • cookie-cdn.cookiepro.com adds 379ms and costs ~€4/month
  • www.ucd.ie adds 235ms 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.ucd.ie takes 1486ms 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 1363ms 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.juicer.io takes 1055ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

67% of www.juicer.io'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

Google Tag Manager takes 640ms 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

cookie-cdn.cookiepro.com takes 379ms 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

54% of cookie-cdn.cookiepro.com'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

www.ucd.ie takes 235ms 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

85% of www.ucd.ie'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

55% of www.ucd.ie'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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