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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
84
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.11 s

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

2.32 s

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

98 ms

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

0.000

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

1.46 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.

4.23 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 3 REVIEW 5 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 69 requests
FIX
4.7 MB transferred, 69 requests
Critical::
Page weighs 7.7 MB (4.7 MB transferred)
Warning::
Images are 3.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.2 MB
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
Fonts are 221 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 221 KB
Info::
69 HTTP requests
Info::
Estimated 0.99 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
69 requests
0.99 g CO2 per page load
Images 3.2 MiB 67%
JavaScript 1.2 MiB 26%
Fonts 221.2 KiB 5%
CSS 65.0 KiB 1%
HTML 24.6 KiB 1%
Other 8.3 KiB 0%
Other 804 B 0%
Other 430 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

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
JS Bundles
Action
28 scripts, 430 KB unused
FIX
28 scripts, 430 KB unused
Warning::
https://metrics.ncl.ac.uk/gtag/js?id=G-VH2F6S16XP&...: 78 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://metrics.ncl.ac.uk/gtag/js?id=AW-777937483&...: 73 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-380...: 65 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-124...: 63 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://metrics.ncl.ac.uk/gtm.js?id=GTM-5HH99Z: 62 KB unused (27%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 430 KB
430 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://metrics.ncl.ac.uk/gtag/js?id=G-VH2F6S16XP&cx=c&gtm=4e64k0h2&sign=c8466af07364d8b6218eaaa1b5593b460bdaeca08b236b87de8f094c1f781d62_20260421205 KB78 KB (38%)✓3rd
https://metrics.ncl.ac.uk/gtag/js?id=AW-777937483&cx=c&gtm=4e64k0h2&sign=c8466af07364d8b6218eaaa1b5593b460bdaeca08b236b87de8f094c1f781d62_20260421166 KB73 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-380968450&cx=c&gtm=4e64k0h2&sign=c8466af07364d8b6218eaaa1b5593b460bdaeca08b236b87de8f094c1f781d62_20260421144 KB65 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-12430850&cx=c&gtm=4e64k0h2&sign=c8466af07364d8b6218eaaa1b5593b460bdaeca08b236b87de8f094c1f781d62_20260421130 KB63 KB (48%)✓3rd
https://metrics.ncl.ac.uk/gtm.js?id=GTM-5HH99Z229 KB62 KB (27%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB36 KB (65%)✓3rd
https://consent.cookiebot.com/1ebf835b-c525-4423-9bd4-669b6cf0b7cd/cc.js?renew=false&referer=www.ncl.ac.uk&dnt=false&init=false172 KB31 KB (18%)✓3rd
https://consent.cookiebot.com/uc.js36 KB23 KB (64%)✓3rd
https://www.youtube.com/iframe_api?apiKey=AIzaSyAAH_WLyeIGyalKrINKwCCXzIWhQDbno_g4 KB—✓3rd
https://www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__slick.min.js12 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

F
Page Weight Inventory
Action
69 resources · 4.7 MB · 430 KB savings available
FIX
69 resources · 4.7 MB · 430 KB savings available
Warning::
Page weight 3.7 MB over 1MB target
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~430 KB of savings available
Warning::
68 third-party resources (100% of weight)
Info::
6 resources over 200KB
69 resources · 4.7 MiB · 68 third-party 3.7 MiB over 1MB target
Image 67% · 3.2 MiB
JavaScript 26% · 1.2 MiB
Font 5% · 221.2 KiB
CSS 1% · 65.0 KiB
Document 1% · 24.6 KiB
Other 0% · 8.8 KiB

~430.2 KiB of savings available

Remove unused JavaScript: 430.2 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
https://www.ncl.ac.uk/media/wwwnclacuk/pressoffice... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ncl.ac.uk/media/wwwnclacuk/pressoffice... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://from.ncl.ac.uk/hubfs/New%20Project%20(35)-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ncl.ac.uk/media/wwwnclacuk/pressoffice... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://from.ncl.ac.uk/hubfs/FromBlog_WHD26_Header... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://from.ncl.ac.uk/hubfs/FromBlog_NewcastleSto... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 3.2 MB
0 oversized -0 KB
16 legacy format
6 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

C
JS Execution Cost
Action
1064ms total JS execution
REVIEW
1064ms total JS execution
Info::
https://consent.cookiebot.com/uc.js: 219ms CPU time
Info::
https://code.jquery.com/jquery-3.7.1.min.js: 184ms CPU time
Info::
Unattributable: 135ms CPU time
Info::
https://www.ncl.ac.uk/: 135ms CPU time
Info::
https://metrics.ncl.ac.uk/gtm.js?id=GTM-5HH99Z: 131ms CPU time
Warning::
Third-party scripts: 1064ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 17% Style & Layout 10% Parse HTML & CSS 9% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://consent.cookiebot.com/uc.js219ms105ms2ms3rd
https://code.jquery.com/jquery-3.7.1.min.js184ms93ms2ms3rd
Unattributable135ms3ms0ms3rd
https://www.ncl.ac.uk/135ms3ms1ms3rd
https://metrics.ncl.ac.uk/gtm.js?id=GTM-5HH99Z131ms108ms15ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-12430850&cx=c&gtm=4e64k0h2&sign=c8466af07364d8b6218eaaa1b5593b460bdaeca08b236b87de8f094c1f781d62_20260421100ms91ms8ms3rd
https://scripts.clarity.ms/0.8.60-beta/clarity.js97ms84ms2ms3rd
https://metrics.ncl.ac.uk/gtag/js?id=G-VH2F6S16XP&cx=c&gtm=4e64k0h2&sign=c8466af07364d8b6218eaaa1b5593b460bdaeca08b236b87de8f094c1f781d62_2026042162ms52ms10ms3rd
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 (221 KB)
PASS
6 fonts (221 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

221 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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 2.3 shttps://www.ncl.ac.uk/webtemplate/fonts/bariol_regular.woff2bariol_regular.woff2 https://www.ncl.ac.uk/webtemplate/fonts/bariol_regular.woff2 — 47.0 KiB — 112 ms — font-display: swaphttps://www.ncl.ac.uk/webtemplate/fonts/derailed-bold-webfont.woff2derailed-bold-webfont.w... https://www.ncl.ac.uk/webtemplate/fonts/derailed-bold-webfont.woff2 — 24.2 KiB — 191 ms — font-display: swaphttps://www.ncl.ac.uk/webtemplate/fonts/derailed-extrabold-webfont.woff2derailed-extrabold-webf... https://www.ncl.ac.uk/webtemplate/fonts/derailed-extrabold-webfont.woff2 — 24.1 KiB — 181 ms — font-display: swaphttps://www.ncl.ac.uk/webtemplate/fonts/derailed-semibold-webfont.woff2derailed-semibold-webfo... https://www.ncl.ac.uk/webtemplate/fonts/derailed-semibold-webfont.woff2 — 24.3 KiB — 179 ms — font-display: swaphttps://www.ncl.ac.uk/webtemplate/fonts/fa/fa-solid-900.woff2fa-solid-900.woff2 https://www.ncl.ac.uk/webtemplate/fonts/fa/fa-solid-900.woff2 — 77.6 KiB — 228 ms — font-display: swaphttps://www.ncl.ac.uk/webtemplate/fonts/derailed-regular-webfont.woff2derailed-regular-webfon... https://www.ncl.ac.uk/webtemplate/fonts/derailed-regular-webfont.woff2 — 24.0 KiB — 152 ms — font-display: swap
bariol_regular.woff2 woff2 swap
Size 47 KB
Load time 112 ms
Start 359 ms
Risk FOUT — text flashes from fallback to web font
derailed-bold-webfont.w... woff2 swap
Size 24 KB
Load time 191 ms
Start 359 ms
Risk FOUT — text flashes from fallback to web font
derailed-extrabold-webf... woff2 swap
Size 24 KB
Load time 181 ms
Start 359 ms
Risk FOUT — text flashes from fallback to web font
derailed-semibold-webfo... woff2 swap
Size 24 KB
Load time 179 ms
Start 359 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 78 KB
Load time 228 ms
Start 360 ms
Risk FOUT — text flashes from fallback to web font
derailed-regular-webfon... woff2 swap
Size 24 KB
Load time 152 ms
Start 360 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
Network Waterfall
69 requests over 4248ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.1 s LCP 2.3 shttps://ncl.ac.uk// https://ncl.ac.uk/ — 302 — 75 B — 165 ms — http/1.1https://www.ncl.ac.uk/www.ncl.ac.uk/ https://www.ncl.ac.uk/ — 200 — 23.8 KiB — 190 ms — http/1.1https://consent.cookiebot.com/uc.jsconsent.cookiebot.com/uc.js https://consent.cookiebot.com/uc.js — 200 — 35.7 KiB — 51 ms — h2https://www.ncl.ac.uk/webtemplate/fonts/bariol_regular.woff2www.ncl.ac.uk/webtemplate/fonts/bar... https://www.ncl.ac.uk/webtemplate/fonts/bariol_regular.woff2 — 200 — 47.0 KiB — 112 ms — http/1.1https://www.ncl.ac.uk/webtemplate/fonts/derailed-bold-webfont.woff2www.ncl.ac.uk/webtemplate/fonts/der... https://www.ncl.ac.uk/webtemplate/fonts/derailed-bold-webfont.woff2 — 200 — 24.2 KiB — 191 ms — http/1.1https://www.ncl.ac.uk/webtemplate/fonts/derailed-extrabold-webfont.woff2www.ncl.ac.uk/webtemplate/fonts/der... https://www.ncl.ac.uk/webtemplate/fonts/derailed-extrabold-webfont.woff2 — 200 — 24.1 KiB — 181 ms — http/1.1https://www.ncl.ac.uk/webtemplate/fonts/derailed-semibold-webfont.woff2www.ncl.ac.uk/webtemplate/fonts/der... https://www.ncl.ac.uk/webtemplate/fonts/derailed-semibold-webfont.woff2 — 200 — 24.3 KiB — 179 ms — http/1.1https://www.ncl.ac.uk/webtemplate/fonts/fa/fa-solid-900.woff2www.ncl.ac.uk/webtemplate/fonts/fa/... https://www.ncl.ac.uk/webtemplate/fonts/fa/fa-solid-900.woff2 — 200 — 77.6 KiB — 228 ms — http/1.1https://www.ncl.ac.uk/webtemplate/fonts/derailed-regular-webfont.woff2www.ncl.ac.uk/webtemplate/fonts/der... https://www.ncl.ac.uk/webtemplate/fonts/derailed-regular-webfont.woff2 — 200 — 24.0 KiB — 152 ms — http/1.1https://www.ncl.ac.uk/webtemplate/css/sites/brand-hub/main.csswww.ncl.ac.uk/webtemplate/css/sites... https://www.ncl.ac.uk/webtemplate/css/sites/brand-hub/main.css — 200 — 65.0 KiB — 230 ms — http/1.1https://code.jquery.com/jquery-3.7.1.min.jscode.jquery.com/jquery-3.7.1.min.js https://code.jquery.com/jquery-3.7.1.min.js — 200 — 30.0 KiB — 40 ms — h2https://www.ncl.ac.uk/webtemplate/js/dist/lib/codeSplitting.min.jswww.ncl.ac.uk/webtemplate/js/dist/l... https://www.ncl.ac.uk/webtemplate/js/dist/lib/codeSplitting.min.js — 200 — 711 B — 203 ms — http/1.1https://pxl-nclacuk.terminalfour.net/prod01/channel_3/mediav8/external-homepage/images/Ancient-Egyptian-Bow-Drill-1800-x-1213.jpgpxl-nclacuk.terminalfour.net/prod01... https://pxl-nclacuk.terminalfour.net/prod01/channel_3/mediav8/external-homepage/images/Ancient-Egyptian-Bow-Drill-1800-x-1213.jpg — 200 — 568.5 KiB — 125 ms — h2https://consentcdn.cookiebot.com/consentconfig/1ebf835b-c525-4423-9bd4-669b6cf0b7cd/settings.jsonconsentcdn.cookiebot.com/consentcon... https://consentcdn.cookiebot.com/consentconfig/1ebf835b-c525-4423-9bd4-669b6cf0b7cd/settings.json — 200 — 966 B — 51 ms — h2https://www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/business%20meeting%20grid.jpgwww.ncl.ac.uk/media/wwwnclacuk/pres... https://www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/business%20meeting%20grid.jpg — 200 — 197.7 KiB — 132 ms — http/1.1https://www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/news/coral-nursery-grid.jpgwww.ncl.ac.uk/media/wwwnclacuk/pres... https://www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/news/coral-nursery-grid.jpg — 200 — 129.9 KiB — 122 ms — http/1.1https://www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/news/Lough%20Neagh%20GRID%20credit%20Queens%20University%20Belfast.jpgwww.ncl.ac.uk/media/wwwnclacuk/pres... https://www.ncl.ac.uk/media/wwwnclacuk/pressoffice/images/news/Lough%20Neagh%20GRID%20credit%20Queens%20University%20Belfast.jpg — 200 — 119.3 KiB — 91 ms — http/1.1https://www.ncl.ac.uk/webtemplate/js/ncuvision__pagination.jswww.ncl.ac.uk/webtemplate/js/ncuvis... https://www.ncl.ac.uk/webtemplate/js/ncuvision__pagination.js — 200 — 2.8 KiB — 52 ms — http/1.1https://www.ncl.ac.uk/webtemplate/js/ncuvision__courseNavDisplay.jswww.ncl.ac.uk/webtemplate/js/ncuvis... https://www.ncl.ac.uk/webtemplate/js/ncuvision__courseNavDisplay.js — 200 — 867 B — 45 ms — http/1.1https://s.ytimg.com/yts/jsbin/www-widgetapi-vflmgpyWO/www-widgetapi.jss.ytimg.com/yts/jsbin/www-widgetapi... https://s.ytimg.com/yts/jsbin/www-widgetapi-vflmgpyWO/www-widgetapi.js — 200 — 8.0 KiB — 89 ms — h2https://www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__fitvids.min.jswww.ncl.ac.uk/webtemplate/js/dist/l... https://www.ncl.ac.uk/webtemplate/js/dist/lib/ncuvision__fitvids.min.js — 200 — 1.1 KiB — 59 ms — http/1.1https://consent.cookiebot.com/1ebf835b-c525-4423-9bd4-669b6cf0b7cd/cc.js?renew=false&referer=www.ncl.ac.uk&dnt=false&init=falseconsent.cookiebot.com/1ebf835b-c525... https://consent.cookiebot.com/1ebf835b-c525-4423-9bd4-669b6cf0b7cd/cc.js?renew=false&referer=www.ncl.ac.uk&dnt=false&init=false — 200 — 171.9 KiB — 91 ms — h2https://metrics.ncl.ac.uk/gtm.js?id=GTM-5HH99Zmetrics.ncl.ac.uk/gtm.js?id=GTM-5HH... https://metrics.ncl.ac.uk/gtm.js?id=GTM-5HH99Z — 200 — 229.0 KiB — 185 ms — h2https://pxl-nclacuk.terminalfour.net/prod01/channel_3/mediav8/external-homepage/images/dual-scholarships.jpgpxl-nclacuk.terminalfour.net/prod01... https://pxl-nclacuk.terminalfour.net/prod01/channel_3/mediav8/external-homepage/images/dual-scholarships.jpg — 200 — 102.0 KiB — 22 ms — h2https://pxl-nclacuk.terminalfour.net/prod01/channel_3/mediav8/study-with-us/general-images/dual-column-international-optimised.jpgpxl-nclacuk.terminalfour.net/prod01... https://pxl-nclacuk.terminalfour.net/prod01/channel_3/mediav8/study-with-us/general-images/dual-column-international-optimised.jpg — 200 — 63.2 KiB — 22 ms — h2https://pxl-nclacuk.terminalfour.net/prod01/channel_3/mediav8/external-homepage/images/promo-banner-international.jpgpxl-nclacuk.terminalfour.net/prod01... 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https://pagead2.googlesyndication.com/ccm/collect?rcb=1&frm=0&en=page_view&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1106786372.1776809761&navt=n&npa=1&us_privacy=1---&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45be64k0h2v9177490799z871994491za20gzb71994491zd71994491xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115938466~115938468~117266400&apve=1&apvf=f&apvc=0&tids=AW-380968450&tid=AW-380968450&tft=1776809760701&tfd=2063 — 200 — 21 B — 83 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=1&frm=0&ae=g&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1106786372.1776809761&navt=n&npa=1&us_privacy=1---&ep.ads_data_redaction=1&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45be64k0h2v9177490799z871994491za20gzb71994491zd71994491xea&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115938466~115938468~117266400&apve=1&apvf=f&apvc=0&tids=AW-380968450&tid=AW-380968450&tft=1776809760701&tfd=2064pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=1&frm=0&ae=g&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1106786372.1776809761&navt=n&npa=1&us_privacy=1---&ep.ads_data_redaction=1&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45be64k0h2v9177490799z871994491za20gzb71994491zd71994491xea&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115938466~115938468~117266400&apve=1&apvf=f&apvc=0&tids=AW-380968450&tid=AW-380968450&tft=1776809760701&tfd=2064 — 200 — 21 B — 82 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=11&frm=0&en=page_view&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1106786372.1776809761&navt=n&npa=1&us_privacy=1---&gdid=dMWZhNz&_tu=CA&gtm=45fe64k0h2v9181801582z871994491za20gzb71994491zd71994491xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115616985~115938466~115938469~117266401~118463262&apve=1&apvf=f&apvc=0&tids=DC-12430850&tid=DC-12430850&tft=1776809760702&tfd=2065pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=11&frm=0&en=page_view&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1106786372.1776809761&navt=n&npa=1&us_privacy=1---&gdid=dMWZhNz&_tu=CA&gtm=45fe64k0h2v9181801582z871994491za20gzb71994491zd71994491xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115616985~115938466~115938469~117266401~118463262&apve=1&apvf=f&apvc=0&tids=DC-12430850&tid=DC-12430850&tft=1776809760702&tfd=2065 — 200 — 21 B — 81 ms — h3https://metrics.ncl.ac.uk/g/collect?v=2&tid=G-VH2F6S16XP&gtm=45he64k0h2v875827916z871994491za20kzb71994491zd71994491&_p=1776809759247&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&gdid=dMWZhNz&ecid=1379267044&_eu=EAAAAGA&_fplc=0&are=1&cid=791053667.1776809761&ec_mode=c&frm=0&gtm_up=1&ir=1&pscdl=denied&rcb=11&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&ur=ES-MD&sst.rnd=1106786372.1776809761&sst.etld=google.es&sst.gcsub=region1&sst.adr=1&sst.us_privacy=1---&sst.tft=1776809759247&sst.lpc=156832676&sst.navt=n&sst.ude=1&gaf=2&_s=1&tag_exp=0~115938466~115938469~117266400~118167058&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&sid=1776809760&sct=1&seg=0&dt=Newcastle%20University%20%7C%20World%20Top%20140%20Research-led%20UK%20University%20%7C%20Newcastle%20University&_tu=DA&en=page_view&_fv=1&_nsi=1&_ss=1&gap.gtb=2&ep.event_id=1776810278737_17768104653436&ep.event_time=2026-04-21T22%3A15%3A59.813%2B00%3A00&ep.action_source=website&ep.content_group3=other%20group&ep.user_data._tag_mode=CODE&tfd=2082&richsstssemetrics.ncl.ac.uk/g/collect?v=2&tid... https://metrics.ncl.ac.uk/g/collect?v=2&tid=G-VH2F6S16XP&gtm=45he64k0h2v875827916z871994491za20kzb71994491zd71994491&_p=1776809759247&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&gdid=dMWZhNz&ecid=1379267044&_eu=EAAAAGA&_fplc=0&are=1&cid=791053667.1776809761&ec_mode=c&frm=0&gtm_up=1&ir=1&pscdl=denied&rcb=11&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&ur=ES-MD&sst.rnd=1106786372.1776809761&sst.etld=google.es&sst.gcsub=region1&sst.adr=1&sst.us_privacy=1---&sst.tft=1776809759247&sst.lpc=156832676&sst.navt=n&sst.ude=1&gaf=2&_s=1&tag_exp=0~115938466~115938469~117266400~118167058&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&sid=1776809760&sct=1&seg=0&dt=Newcastle%20University%20%7C%20World%20Top%20140%20Research-led%20UK%20University%20%7C%20Newcastle%20University&_tu=DA&en=page_view&_fv=1&_nsi=1&_ss=1&gap.gtb=2&ep.event_id=1776810278737_17768104653436&ep.event_time=2026-04-21T22%3A15%3A59.813%2B00%3A00&ep.action_source=website&ep.content_group3=other%20group&ep.user_data._tag_mode=CODE&tfd=2082&richsstsse — 200 — 325 B — 197 ms — h2https://from.ncl.ac.uk/hubfs/New%20Project%20(35)-2.jpgfrom.ncl.ac.uk/hubfs/New%20Project%... https://from.ncl.ac.uk/hubfs/New%20Project%20(35)-2.jpg — 200 — 21.5 KiB — 80 ms — h3https://from.ncl.ac.uk/hubfs/FromBlog_WHD26_Header_sm.jpgfrom.ncl.ac.uk/hubfs/FromBlog_WHD26... https://from.ncl.ac.uk/hubfs/FromBlog_WHD26_Header_sm.jpg — 200 — 591.1 KiB — 616 ms — h3https://from.ncl.ac.uk/hubfs/FromBlog_NewcastleStockholmGlaciers_Header_sm.jpgfrom.ncl.ac.uk/hubfs/FromBlog_Newca... https://from.ncl.ac.uk/hubfs/FromBlog_NewcastleStockholmGlaciers_Header_sm.jpg — 200 — 130.0 KiB — 82 ms — h3https://j.clarity.ms/collectj.clarity.ms/collect https://j.clarity.ms/collect — 204 — 277 B — 105 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 1064ms · 678KB · £11/mo
consent.cookiebot.com
Other
Costly
Execution 219ms
Transfer 36 KB
Unused 64%
Monthly Cost £2/mo
code.jquery.com
Other
Optional
Execution 184ms
Transfer 30 KB
Monthly Cost £2/mo
Unattributable
Other
Optional
Execution 135ms
Transfer 0 KB
Monthly Cost £1/mo
www.ncl.ac.uk
Other
Optional
Execution 135ms
Transfer 24 KB
Monthly Cost £1/mo
metrics.ncl.ac.uk
Other
Optional
Execution 131ms
Transfer 229 KB
Unused 27%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 100ms
Transfer 130 KB
Unused 48%
Monthly Cost £1/mo
Microsoft Clarity
Session Replay
Optional
Execution 97ms
Transfer 25 KB
Monthly Cost £1/mo
metrics.ncl.ac.uk
Other
Optional
Execution 62ms
Transfer 205 KB
Unused 38%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • consent.cookiebot.com adds 219ms and costs ~£2/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

consent.cookiebot.com takes 219ms 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

64% of consent.cookiebot.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

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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