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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
37
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.

3.49 s

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

22.60 s

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

1.35 s

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.

6.67 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.

22.72 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 2 REVIEW 6 FIX
F
Page Weight Budget
Action
4.4 MB transferred, 70 requests
FIX
4.4 MB transferred, 70 requests
Critical::
Page weighs 7.4 MB (4.4 MB transferred)
Warning::
Images are 2.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.9 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::
70 HTTP requests
Info::
Estimated 0.93 g CO2 per page load
4.4 MB / 2.4 MB budget
4.4 MB transferred
70 requests
0.93 g CO2 per page load
Images 2.9 MiB 65%
JavaScript 1.2 MiB 28%
Fonts 221.2 KiB 5%
CSS 65.0 KiB 1%
HTML 24.6 KiB 1%
Other 8.0 KiB 0%
Other 804 B 0%
Other 420 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 (4.4 MiB of 4.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4130ms total JS execution
FIX
4130ms total JS execution
Warning::
https://consent.cookiebot.com/uc.js: 897ms CPU time
Warning::
https://code.jquery.com/jquery-3.7.1.min.js: 574ms CPU time
Warning::
Unattributable: 538ms CPU time
Warning::
https://metrics.ncl.ac.uk/gtm.js?id=GTM-5HH99Z: 512ms CPU time
Warning::
https://scripts.clarity.ms/0.8.60-beta/clarity.js: 384ms CPU time
Warning::
Third-party scripts: 4130ms (100% of total)

Main Thread Breakdown

Script Evaluation 57% Other 14% Parse HTML & CSS 10% Style & Layout 9% Script Parsing & Compilation 6% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://consent.cookiebot.com/uc.js897ms428ms8ms3rd
https://code.jquery.com/jquery-3.7.1.min.js574ms273ms8ms3rd
Unattributable538ms10ms0ms3rd
https://metrics.ncl.ac.uk/gtm.js?id=GTM-5HH99Z512ms417ms56ms3rd
https://scripts.clarity.ms/0.8.60-beta/clarity.js384ms335ms6ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-380968450&cx=c&gtm=4e64h1&sign=97fb0b16cd01f6072a9878eef30a39e4868968fc5dc92b3ed626af78eba2c71e_20260421381ms351ms27ms3rd
https://www.ncl.ac.uk/297ms12ms13ms3rd
https://metrics.ncl.ac.uk/gtag/js?id=G-VH2F6S16XP&cx=c&gtm=4e64h1&sign=97fb0b16cd01f6072a9878eef30a39e4868968fc5dc92b3ed626af78eba2c71e_20260421178ms138ms39ms3rd
https://metrics.ncl.ac.uk/gtag/js?id=AW-777937483&cx=c&gtm=4e64h1&sign=97fb0b16cd01f6072a9878eef30a39e4868968fc5dc92b3ed626af78eba2c71e_20260421134ms103ms31ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js131ms113ms17ms3rd

Showing top 10 of 11 scripts

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&...: 72 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=4e64h1&sign=97fb0b16cd01f6072a9878eef30a39e4868968fc5dc92b3ed626af78eba2c71e_20260421205 KB78 KB (38%)✓3rd
https://metrics.ncl.ac.uk/gtag/js?id=AW-777937483&cx=c&gtm=4e64h1&sign=97fb0b16cd01f6072a9878eef30a39e4868968fc5dc92b3ed626af78eba2c71e_20260421166 KB72 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-380968450&cx=c&gtm=4e64h1&sign=97fb0b16cd01f6072a9878eef30a39e4868968fc5dc92b3ed626af78eba2c71e_20260421144 KB65 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-12430850&cx=c&gtm=4e64h1&sign=97fb0b16cd01f6072a9878eef30a39e4868968fc5dc92b3ed626af78eba2c71e_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_g3 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
70 resources · 4.4 MB · 430 KB savings available
FIX
70 resources · 4.4 MB · 430 KB savings available
Warning::
Page weight 3.4 MB over 1MB target
Got: 4.4 MB Expected: ≤ 1 MB
Info::
~430 KB of savings available
Warning::
69 third-party resources (100% of weight)
Info::
6 resources over 200KB
70 resources · 4.4 MiB · 69 third-party 3.4 MiB over 1MB target
Image 65% · 2.9 MiB
JavaScript 28% · 1.2 MiB
Font 5% · 221.2 KiB
CSS 1% · 65.0 KiB
Document 1% · 24.6 KiB
Other 0% · 8.5 KiB

~429.6 KiB of savings available

Remove unused JavaScript: 429.6 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
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
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.
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://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://www.ncl.ac.uk/media/wwwnclacuk/pressoffice... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 2.9 MB
0 oversized -0 KB
17 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
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s FCP 3.5 s LCP 22.6 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 — 102 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 — 178 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 — 182 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 — 230 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 — 141 ms — font-display: swap
bariol_regular.woff2 woff2 swap
Size 47 KB
Load time 102 ms
Start 352 ms
Risk FOUT — text flashes from fallback to web font
derailed-bold-webfont.w... woff2 swap
Size 24 KB
Load time 191 ms
Start 352 ms
Risk FOUT — text flashes from fallback to web font
derailed-extrabold-webf... woff2 swap
Size 24 KB
Load time 178 ms
Start 352 ms
Risk FOUT — text flashes from fallback to web font
derailed-semibold-webfo... woff2 swap
Size 24 KB
Load time 182 ms
Start 353 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 78 KB
Load time 230 ms
Start 353 ms
Risk FOUT — text flashes from fallback to web font
derailed-regular-webfon... woff2 swap
Size 24 KB
Load time 141 ms
Start 353 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
—
preload
6
dns-prefetch
—
prefetch
—

6 resource hints configured

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
70 requests over 3166ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s FCP 3.5 s LCP 22.6 shttps://ncl.ac.uk// https://ncl.ac.uk/ — 302 — 75 B — 145 ms — http/1.1https://www.ncl.ac.uk/www.ncl.ac.uk/ https://www.ncl.ac.uk/ — 200 — 23.8 KiB — 201 ms — http/1.1https://consent.cookiebot.com/uc.jsconsent.cookiebot.com/uc.js https://consent.cookiebot.com/uc.js — 200 — 35.7 KiB — 66 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 — 102 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 — 178 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 — 182 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 — 230 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 — 141 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 — 227 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 — 35 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 — 182 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 — 157 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 — 57 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 — 128 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 — 133 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 — 88 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 — 56 ms — 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h3https://pagead2.googlesyndication.com/ccm/collect?rcb=17&frm=0&en=page_view&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&scrsrc=metrics.ncl.ac.uk&rnd=492784809.1776809740&navt=n&npa=1&us_privacy=1---&did=dMWZhNz&gdid=dMWZhNz&_tu=DA&gtm=459e64h1v9240899467z871994491za20kzb71994491zd71994491xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938469~117266401~118128922&apve=1&apvf=f&gap.gtb=2&apvc=0&tids=AW-779104845~AW-777937483&tid=AW-779104845&tft=1776809740090&tfd=1884pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=17&frm=0&en=page_view&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&scrsrc=metrics.ncl.ac.uk&rnd=492784809.1776809740&navt=n&npa=1&us_privacy=1---&did=dMWZhNz&gdid=dMWZhNz&_tu=DA&gtm=459e64h1v9240899467z871994491za20kzb71994491zd71994491xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938469~117266401~118128922&apve=1&apvf=f&gap.gtb=2&apvc=0&tids=AW-779104845~AW-777937483&tid=AW-779104845&tft=1776809740090&tfd=1884 — 200 — 21 B — 98 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=3&frm=0&en=page_view&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=492784809.1776809740&navt=n&npa=1&us_privacy=1---&gdid=dMWZhNz&_tu=CA&gtm=45fe64h1v9181801582z871994491za20gzb71994491zd71994491xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938469~117266400~118463262&apve=1&apvf=f&apvc=0&tids=DC-12430850&tid=DC-12430850&tft=1776809740091&tfd=1885pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=3&frm=0&en=page_view&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=492784809.1776809740&navt=n&npa=1&us_privacy=1---&gdid=dMWZhNz&_tu=CA&gtm=45fe64h1v9181801582z871994491za20gzb71994491zd71994491xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938469~117266400~118463262&apve=1&apvf=f&apvc=0&tids=DC-12430850&tid=DC-12430850&tft=1776809740091&tfd=1885 — 200 — 21 B — 94 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=492784809.1776809740&navt=n&npa=1&us_privacy=1---&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45be64h1v9177490799z871994491za20gzb71994491zd71994491xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938468~117266401~117384406&apve=1&apvf=f&apvc=0&tids=AW-380968450&tid=AW-380968450&tft=1776809740092&tfd=1886pagead2.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=492784809.1776809740&navt=n&npa=1&us_privacy=1---&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45be64h1v9177490799z871994491za20gzb71994491zd71994491xec&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938468~117266401~117384406&apve=1&apvf=f&apvc=0&tids=AW-380968450&tid=AW-380968450&tft=1776809740092&tfd=1886 — 200 — 21 B — 100 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=11&frm=0&ae=g&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=492784809.1776809740&navt=n&npa=1&us_privacy=1---&ep.ads_data_redaction=1&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45be64h1v9177490799z871994491za20gzb71994491zd71994491xea&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938468~117266401~117384406&apve=1&apvf=f&apvc=0&tids=AW-380968450&tid=AW-380968450&tft=1776809740093&tfd=1886pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=11&frm=0&ae=g&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=492784809.1776809740&navt=n&npa=1&us_privacy=1---&ep.ads_data_redaction=1&did=dMWZhNz&gdid=dMWZhNz&_tu=CA&gtm=45be64h1v9177490799z871994491za20gzb71994491zd71994491xea&gcs=G100&gcd=13p3pPp2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938468~117266401~117384406&apve=1&apvf=f&apvc=0&tids=AW-380968450&tid=AW-380968450&tft=1776809740093&tfd=1886 — 200 — 21 B — 99 ms — h3https://metrics.ncl.ac.uk/g/collect?v=2&tid=G-VH2F6S16XP&gtm=45he64h1v875827916z871994491za20kzb71994491zd71994491&_p=1776809738807&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&gdid=dMWZhNz&ecid=1880049286&_eu=EAAAAGA&_fplc=0&are=1&cid=1811654255.1776809740&ec_mode=c&frm=0&gtm_up=1&ir=1&pscdl=denied&rcb=10&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&ur=ES-MD&sst.rnd=492784809.1776809740&sst.etld=google.es&sst.gcsub=region1&sst.adr=1&sst.us_privacy=1---&sst.tft=1776809738807&sst.lpc=156832676&sst.navt=n&sst.ude=1&gaf=2&_s=1&tag_exp=0~115616986~115938465~115938468~117266400&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&sid=1776809739&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=1776810648369_17768103074476&ep.event_time=2026-04-21T22%3A15%3A39.301%2B00%3A00&ep.action_source=website&ep.content_group3=other%20group&ep.user_data._tag_mode=CODE&tfd=1901&richsstssemetrics.ncl.ac.uk/g/collect?v=2&tid... https://metrics.ncl.ac.uk/g/collect?v=2&tid=G-VH2F6S16XP&gtm=45he64h1v875827916z871994491za20kzb71994491zd71994491&_p=1776809738807&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&gdid=dMWZhNz&ecid=1880049286&_eu=EAAAAGA&_fplc=0&are=1&cid=1811654255.1776809740&ec_mode=c&frm=0&gtm_up=1&ir=1&pscdl=denied&rcb=10&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&ur=ES-MD&sst.rnd=492784809.1776809740&sst.etld=google.es&sst.gcsub=region1&sst.adr=1&sst.us_privacy=1---&sst.tft=1776809738807&sst.lpc=156832676&sst.navt=n&sst.ude=1&gaf=2&_s=1&tag_exp=0~115616986~115938465~115938468~117266400&dl=https%3A%2F%2Fwww.ncl.ac.uk%2F&sid=1776809739&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=1776810648369_17768103074476&ep.event_time=2026-04-21T22%3A15%3A39.301%2B00%3A00&ep.action_source=website&ep.content_group3=other%20group&ep.user_data._tag_mode=CODE&tfd=1901&richsstsse — 200 — 315 B — 251 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 — 72 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 — 87.0 KiB — 71 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 — 357.6 KiB — 173 ms — h3https://j.clarity.ms/collectj.clarity.ms/collect https://j.clarity.ms/collect — 204 — 277 B — 421 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 4130ms · 1045KB · £43/mo
consent.cookiebot.com
Other
Costly
Execution 897ms
Transfer 36 KB
Unused 64%
Monthly Cost £9/mo
code.jquery.com
Other
Costly
Execution 574ms
Transfer 30 KB
Monthly Cost £6/mo
Unattributable
Other
Costly
Execution 538ms
Transfer 0 KB
Monthly Cost £6/mo
metrics.ncl.ac.uk
Other
Costly
Execution 512ms
Transfer 229 KB
Unused 27%
Monthly Cost £5/mo
Microsoft Clarity
Session Replay
Costly
Execution 384ms
Transfer 25 KB
Monthly Cost £4/mo
Google Tag Manager
Tag Manager
Costly
Execution 381ms
Transfer 144 KB
Unused 45%
Monthly Cost £4/mo
www.ncl.ac.uk
Other
Costly
Execution 297ms
Transfer 24 KB
Monthly Cost £3/mo
metrics.ncl.ac.uk
Other
Optional
Execution 178ms
Transfer 205 KB
Unused 38%
Monthly Cost £2/mo
metrics.ncl.ac.uk
Other
Optional
Execution 134ms
Transfer 166 KB
Unused 44%
Monthly Cost £1/mo
Hotjar
Session Replay
Optional
Execution 131ms
Transfer 57 KB
Unused 65%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 103ms
Transfer 130 KB
Unused 48%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • consent.cookiebot.com adds 897ms and costs ~£9/month
  • code.jquery.com adds 574ms and costs ~£6/month
  • Unattributable adds 538ms and costs ~£6/month
  • metrics.ncl.ac.uk adds 512ms and costs ~£5/month
  • Microsoft Clarity adds 384ms and costs ~£4/month
  • Google Tag Manager adds 381ms and costs ~£4/month
  • www.ncl.ac.uk adds 297ms 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

consent.cookiebot.com takes 897ms 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

code.jquery.com takes 574ms 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 538ms 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

metrics.ncl.ac.uk takes 512ms 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

Microsoft Clarity takes 384ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

Google Tag Manager takes 381ms 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.ncl.ac.uk takes 297ms 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

65% of Hotjar'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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