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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
35
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

2.62 s

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

18.15 s

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

2.27 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.

8.53 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.

22.96 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
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
3.2 MB transferred, 99 requests
FIX
3.2 MB transferred, 99 requests
Warning::
Page weighs 11.0 MB (3.2 MB transferred)
Warning::
JavaScript is 2.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.0 MB
Info::
Fonts are 305 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 305 KB
Info::
99 HTTP requests
Info::
Estimated 0.67 g CO2 per page load
3.2 MB / 2.4 MB budget
3.2 MB transferred
99 requests
0.67 g CO2 per page load
JavaScript 2.0 MiB 62%
Images 610.7 KiB 19%
Fonts 305.3 KiB 9%
HTML 93.2 KiB 3%
CSS 87.6 KiB 3%
Other 59.5 KiB 2%
Other 52.7 KiB 2%
Other 25.2 KiB 1%
Other 685 B 0%
Other 97 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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 (3.2 MiB of 3.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6799ms total JS execution
FIX
6799ms total JS execution
Warning::
https://www.belfasttelegraph.co.uk/_next/static/ch...: 1574ms CPU time
Warning::
https://www.belfasttelegraph.co.uk/: 895ms CPU time
Warning::
Unattributable: 854ms CPU time
Warning::
https://sdk.privacy-center.org/sdk/22ecd6bfac93de6...: 788ms CPU time
Warning::
https://cdn.kaching.eu.com/prebid/10.21.0/ie/prebi...: 318ms CPU time
Warning::
Third-party scripts: 6799ms (100% of total)

Main Thread Breakdown

Script Evaluation 62% Script Parsing & Compilation 11% Other 11% Style & Layout 8% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.belfasttelegraph.co.uk/_next/static/chunks/framework-136df7d2ca0cb23d.js1574ms1467ms20ms3rd
https://www.belfasttelegraph.co.uk/895ms73ms7ms3rd
Unattributable854ms188ms0ms3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/ui-web-en-web.22ecd6bfac93de604efec0b75b2c796ee1675f92.js788ms674ms22ms3rd
https://cdn.kaching.eu.com/prebid/10.21.0/ie/prebid.js318ms196ms121ms3rd
https://www.belfasttelegraph.co.uk/_next/static/chunks/pages/index-77fcf8405b29ed24.js305ms304ms0ms3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js303ms217ms31ms3rd
https://boot.pbstck.com/v1/tag/04ac5e00-8f2a-4556-a74e-d750a41a1b99210ms119ms55ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QE130723C1&cx=c&gtm=4e64k1h2209ms175ms32ms3rd
https://www.belfasttelegraph.co.uk/_next/static/chunks/pages/_app-732d9763a8b1c0c6.js204ms126ms77ms3rd

Showing top 10 of 20 scripts

F
JS Bundles
Action
42 scripts, 985 KB unused
FIX
42 scripts, 985 KB unused
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 131 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.kaching.eu.com/prebid/10.21.0/ie/prebi...: 128 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.belfasttelegraph.co.uk/_next/static/ch...: 120 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.belfasttelegraph.co.uk/_next/static/ch...: 115 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5V2...: 77 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 985 KB
985 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604210101/pubads_impl.js?cb=31098008188 KB131 KB (70%)✓3rd
https://cdn.kaching.eu.com/prebid/10.21.0/ie/prebid.js166 KB128 KB (77%)✓3rd
https://www.belfasttelegraph.co.uk/_next/static/chunks/3827-ec09a46338e05c3a.js180 KB120 KB (67%)✓3rd
https://www.belfasttelegraph.co.uk/_next/static/chunks/pages/_app-732d9763a8b1c0c6.js190 KB115 KB (61%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5V2GC3W9&gtm_auth=A2JoAoXqE4lErXRHVJII2A&gtm_preview=env-1&gtm_cookies_win=x159 KB77 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-QE130723C1&cx=c&gtm=4e64k1h2144 KB60 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-55F6RW2H&gtm_auth=ADwIFDMk-JS1e6SjEuKpxg&gtm_preview=env-1&gtm_cookies_win=x142 KB55 KB (39%)✓3rd
https://www.belfasttelegraph.co.uk/_next/static/chunks/427ddc6b-5d4d66aad4f7a7c6.js80 KB51 KB (67%)✓3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js102 KB42 KB (42%)✓3rd
https://www.belfasttelegraph.co.uk/_next/static/chunks/2484-7476118800efca26.js72 KB36 KB (51%)✓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
99 resources · 3.2 MB · 985 KB savings available
FIX
99 resources · 3.2 MB · 985 KB savings available
Warning::
Page weight 2.2 MB over 1MB target
Got: 3.2 MB Expected: ≤ 1 MB
Info::
~985 KB of savings available
Warning::
98 third-party resources (100% of weight)
99 resources · 3.2 MiB · 98 third-party 2.2 MiB over 1MB target
JavaScript 65% · 2.1 MiB
Image 19% · 612.7 KiB
Font 9% · 305.3 KiB
Document 3% · 93.2 KiB
CSS 3% · 87.6 KiB
Other 1% · 34.2 KiB

~984.9 KiB of savings available

Remove unused JavaScript: 984.9 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
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Warning::
https://focus.belfasttelegraph.co.uk/raw/prod-mh-d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
27 images 611 KB
0 oversized -0 KB
23 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

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 (305 KB)
PASS
6 fonts (305 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

305 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 FCP 2.6 s LCP 18.1 shttps://www.belfasttelegraph.co.uk/_next/static/media/NuachtSerifText-Medium.c5a1260c.woff2NuachtSerifText-Medium.... https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSerifText-Medium.c5a1260c.woff2 — 54.9 KiB — 74 ms — font-display: swaphttps://www.belfasttelegraph.co.uk/_next/static/media/NuachtSerifText-Bold.e1b56218.woff2NuachtSerifText-Bold.e1... https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSerifText-Bold.e1b56218.woff2 — 54.7 KiB — 80 ms — font-display: swaphttps://www.belfasttelegraph.co.uk/_next/static/media/NuachtSerifText-Regular.981e791a.woff2NuachtSerifText-Regular... https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSerifText-Regular.981e791a.woff2 — 54.3 KiB — 86 ms — font-display: swaphttps://www.belfasttelegraph.co.uk/_next/static/media/NuachtSansWEB-Regular.a4228926.woff2NuachtSansWEB-Regular.a... https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSansWEB-Regular.a4228926.woff2 — 47.7 KiB — 34 ms — font-display: swaphttps://www.belfasttelegraph.co.uk/_next/static/media/NuachtSansWEB-Medium.0aee77ca.woff2NuachtSansWEB-Medium.0a... https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSansWEB-Medium.0aee77ca.woff2 — 47.1 KiB — 84 ms — font-display: swaphttps://www.belfasttelegraph.co.uk/_next/static/media/NuachtSansWEB-Bold.ba7b3020.woff2NuachtSansWEB-Bold.ba7b... https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSansWEB-Bold.ba7b3020.woff2 — 46.7 KiB — 84 ms — font-display: swap
NuachtSerifText-Medium.... woff2 swap
Size 55 KB
Load time 74 ms
Start 231 ms
Risk FOUT — text flashes from fallback to web font
NuachtSerifText-Bold.e1... woff2 swap
Size 55 KB
Load time 80 ms
Start 231 ms
Risk FOUT — text flashes from fallback to web font
NuachtSerifText-Regular... woff2 swap
Size 54 KB
Load time 86 ms
Start 232 ms
Risk FOUT — text flashes from fallback to web font
NuachtSansWEB-Regular.a... woff2 swap
Size 48 KB
Load time 34 ms
Start 232 ms
Risk FOUT — text flashes from fallback to web font
NuachtSansWEB-Medium.0a... woff2 swap
Size 47 KB
Load time 84 ms
Start 235 ms
Risk FOUT — text flashes from fallback to web font
NuachtSansWEB-Bold.ba7b... woff2 swap
Size 47 KB
Load time 84 ms
Start 235 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
99 requests over 2004ms
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 FCP 2.6 s LCP 18.1 shttps://belfasttelegraph.co.uk// https://belfasttelegraph.co.uk/ — 301 — 103 B — 61 ms — h2https://www.belfasttelegraph.co.uk/www.belfasttelegraph.co.uk/ https://www.belfasttelegraph.co.uk/ — 200 — 93.2 KiB — 181 ms — h2https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSerifText-Medium.c5a1260c.woff2www.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSerifText-Medium.c5a1260c.woff2 — 200 — 54.9 KiB — 74 ms — h2https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSerifText-Bold.e1b56218.woff2www.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSerifText-Bold.e1b56218.woff2 — 200 — 54.7 KiB — 80 ms — h2https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSerifText-Regular.981e791a.woff2www.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSerifText-Regular.981e791a.woff2 — 200 — 54.3 KiB — 86 ms — h2https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSansWEB-Regular.a4228926.woff2www.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSansWEB-Regular.a4228926.woff2 — 200 — 47.7 KiB — 34 ms — h2https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSansWEB-Medium.0aee77ca.woff2www.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSansWEB-Medium.0aee77ca.woff2 — 200 — 47.1 KiB — 84 ms — h2https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSansWEB-Bold.ba7b3020.woff2www.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/media/NuachtSansWEB-Bold.ba7b3020.woff2 — 200 — 46.7 KiB — 84 ms — h2https://www.belfasttelegraph.co.uk/_next/static/css/f45464ab8d0b354b.csswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/css/f45464ab8d0b354b.css — 200 — 31.9 KiB — 54 ms — h2https://www.belfasttelegraph.co.uk/_next/static/css/2eab00e3efeb4054.csswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/css/2eab00e3efeb4054.css — 200 — 16.3 KiB — 55 ms — h2https://www.belfasttelegraph.co.uk/_next/static/css/61524148f3e0d582.csswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/css/61524148f3e0d582.css — 200 — 14.4 KiB — 32 ms — h2https://www.belfasttelegraph.co.uk/_next/static/css/2503240ac621e66c.csswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/css/2503240ac621e66c.css — 200 — 12.7 KiB — 55 ms — h2https://www.belfasttelegraph.co.uk/_next/static/css/9d979ee438204f7e.csswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/css/9d979ee438204f7e.css — 200 — 11.3 KiB — 68 ms — h2https://cdn.kaching.eu.com/latest/beltel/kaching.jscdn.kaching.eu.com/latest/beltel/ka... https://cdn.kaching.eu.com/latest/beltel/kaching.js — 200 — 30.7 KiB — 165 ms — h2https://www.belfasttelegraph.co.uk/_next/static/chunks/webpack-b827140e044c18ed.jswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/chunks/webpack-b827140e044c18ed.js — 200 — 3.5 KiB — 70 ms — h2https://www.belfasttelegraph.co.uk/_next/static/chunks/framework-136df7d2ca0cb23d.jswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/chunks/framework-136df7d2ca0cb23d.js — 200 — 64.9 KiB — 79 ms — h2https://www.belfasttelegraph.co.uk/_next/static/chunks/main-58fe3fddd028f4c2.jswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/chunks/main-58fe3fddd028f4c2.js — 200 — 36.6 KiB — 76 ms — h2https://www.belfasttelegraph.co.uk/_next/static/chunks/pages/_app-732d9763a8b1c0c6.jswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/chunks/pages/_app-732d9763a8b1c0c6.js — 200 — 189.6 KiB — 111 ms — h2https://www.belfasttelegraph.co.uk/_next/static/chunks/ef2b5962-835229fb133152b0.jswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/chunks/ef2b5962-835229fb133152b0.js — 200 — 41.8 KiB — 84 ms — h2https://www.belfasttelegraph.co.uk/_next/static/chunks/427ddc6b-5d4d66aad4f7a7c6.jswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/chunks/427ddc6b-5d4d66aad4f7a7c6.js — 200 — 80.0 KiB — 89 ms — h2https://www.belfasttelegraph.co.uk/_next/static/chunks/8660-471881f16f10479f.jswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/chunks/8660-471881f16f10479f.js — 200 — 24.4 KiB — 85 ms — h2https://www.belfasttelegraph.co.uk/_next/static/chunks/3827-ec09a46338e05c3a.jswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/chunks/3827-ec09a46338e05c3a.js — 200 — 179.9 KiB — 131 ms — h2https://www.belfasttelegraph.co.uk/_next/static/chunks/4749-bf45be81bc387991.jswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/chunks/4749-bf45be81bc387991.js — 200 — 24.3 KiB — 99 ms — h2https://www.belfasttelegraph.co.uk/_next/static/chunks/5251-81671265e493fe54.jswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/chunks/5251-81671265e493fe54.js — 200 — 5.5 KiB — 98 ms — h2https://www.belfasttelegraph.co.uk/_next/static/chunks/6602-c581a5d085e104b9.jswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/chunks/6602-c581a5d085e104b9.js — 200 — 41.3 KiB — 108 ms — h2https://www.belfasttelegraph.co.uk/_next/static/chunks/7648-27a1d5865a667763.jswww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/chunks/7648-27a1d5865a667763.js — 200 — 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https://api.cxense.com/segment/lookup?callback=cXJsonpCB&persisted=c25ca4f3debba415cfe73706a92b81ac58a1f7c9&json=%7B%22context%22%3A%7B%22siteId%22%3A%221138567629737805588%22%2C%22url%22%3A%22https%3A%2F%2Fwww.belfasttelegraph.co.uk%2F%22%7D%7D&bpc=1 — 200 — 475 B — 185 ms — h2https://api.privacy-center.org/v1/eventsapi.privacy-center.org/v1/events https://api.privacy-center.org/v1/events — 204 — 567 B — 35 ms — h2https://cdn.jsdelivr.net/gh/prebid/currency-file@1/latest.json?date=20260422cdn.jsdelivr.net/gh/prebid/currency... https://cdn.jsdelivr.net/gh/prebid/currency-file@1/latest.json?date=20260422 — 200 — 1.2 KiB — 44 ms — h2https://www.belfasttelegraph.co.uk/airship-prompt.csswww.belfasttelegraph.co.uk/airship-... https://www.belfasttelegraph.co.uk/airship-prompt.css — 200 — 946 B — 33 ms — h2https://www.belfasttelegraph.co.uk/_next/static/media/logo-icon-inverse.24a6fcb9.pngwww.belfasttelegraph.co.uk/_next/st... https://www.belfasttelegraph.co.uk/_next/static/media/logo-icon-inverse.24a6fcb9.png — 200 — 3.2 KiB — 27 ms — h2https://intake.pbstck.com/v1/intake/web-vitals?fcp=1372.000&tId=04ac5e00-8f2a-4556-a74e-d750a41a1b99&v=none&s=none&c=1intake.pbstck.com/v1/intake/web-vit... https://intake.pbstck.com/v1/intake/web-vitals?fcp=1372.000&tId=04ac5e00-8f2a-4556-a74e-d750a41a1b99&v=none&s=none&c=1 — 204 — 64 B — 80 ms — h2https://content.mediahuisgroup.com/playlist/preview/R4FECpZDWTUg:480p,3oUNfZrBaicg:480p,JSMBXrNaniQG:480p,DzcFNP5TC-4E:480p,rxUJdb_amOQi:480p,8bVJMNJbr-Qg:480p,dwNBVt5biSwk:480pcontent.mediahuisgroup.com/playlist... https://content.mediahuisgroup.com/playlist/preview/R4FECpZDWTUg:480p,3oUNfZrBaicg:480p,JSMBXrNaniQG:480p,DzcFNP5TC-4E:480p,rxUJdb_amOQi:480p,8bVJMNJbr-Qg:480p,dwNBVt5biSwk:480p — 200 — 2.7 KiB — 83 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-QE130723C1&gtm=45je64k1h2v9236778456z89221168796za20gzb9221168796zd9221168796&_p=1776894911374&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&tcfd=10001&gdid=dMTc4Zm&_eu=AAAAAGA&are=1&cid=1034320536.1776894912&frm=0&pscdl=denied&rcb=15&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&_s=1&tag_exp=0~115616985~115938465~115938468~117266401~117512542&dt=Northern%20Ireland%20News%2C%20Sport%20%26%20Opinion&dr=&sid=1776894912&sct=1&seg=0&dl=https%3A%2F%2Fwww.belfasttelegraph.co.uk%2F&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.brandcode=beltel&ep.content_access_level=&ep.content_group=beltel&ep.content_wall_type=none&ep.custom_timestamp=2026-4-22%2021%3A55%3A12&ep.view_port_size=412x823&ep.page_type=home&up.subscription_status=&up.login_status=not%20logged%20in&up.consent_status=unknown&up.identityaccount_id=&up.subscription_id=&up.thirdparty_user_id=&tfd=1905region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-QE130723C1&gtm=45je64k1h2v9236778456z89221168796za20gzb9221168796zd9221168796&_p=1776894911374&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&tcfd=10001&gdid=dMTc4Zm&_eu=AAAAAGA&are=1&cid=1034320536.1776894912&frm=0&pscdl=denied&rcb=15&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&_s=1&tag_exp=0~115616985~115938465~115938468~117266401~117512542&dt=Northern%20Ireland%20News%2C%20Sport%20%26%20Opinion&dr=&sid=1776894912&sct=1&seg=0&dl=https%3A%2F%2Fwww.belfasttelegraph.co.uk%2F&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.brandcode=beltel&ep.content_access_level=&ep.content_group=beltel&ep.content_wall_type=none&ep.custom_timestamp=2026-4-22%2021%3A55%3A12&ep.view_port_size=412x823&ep.page_type=home&up.subscription_status=&up.login_status=not%20logged%20in&up.consent_status=unknown&up.identityaccount_id=&up.subscription_id=&up.thirdparty_user_id=&tfd=1905 — 204 — 557 B — 93 ms — h2https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gptsecurepubads.g.doubleclick.net/page... https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gpt — 200 — 23.0 KiB — 41 ms — h3https://intake.pbstck.com/v1/intake/web-vitals?ttfb=215.900&tId=04ac5e00-8f2a-4556-a74e-d750a41a1b99&v=none&s=none&c=1intake.pbstck.com/v1/intake/web-vit... https://intake.pbstck.com/v1/intake/web-vitals?ttfb=215.900&tId=04ac5e00-8f2a-4556-a74e-d750a41a1b99&v=none&s=none&c=1 — 204 — 33 B — 43 ms — h2https://www.belfasttelegraph.co.uk/favicon.svgwww.belfasttelegraph.co.uk/favicon.... https://www.belfasttelegraph.co.uk/favicon.svg — 200 — 521 B — 36 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 6799ms · 1766KB · £70/mo
www.belfasttelegraph.co.uk
Other
Costly
Execution 1574ms
Transfer 65 KB
Unused 45%
Monthly Cost £16/mo
www.belfasttelegraph.co.uk
Other
Costly
Execution 895ms
Transfer 93 KB
Monthly Cost £9/mo
Unattributable
Other
Costly
Execution 854ms
Transfer 0 KB
Monthly Cost £9/mo
sdk.privacy-center.org
Other
Costly
Execution 788ms
Transfer 53 KB
Monthly Cost £8/mo
cdn.kaching.eu.com
Other
Costly
Execution 318ms
Transfer 166 KB
Unused 77%
Monthly Cost £3/mo
www.belfasttelegraph.co.uk
Other
Costly
Execution 305ms
Transfer 0 KB
Monthly Cost £3/mo
sdk.privacy-center.org
Other
Costly
Execution 303ms
Transfer 102 KB
Unused 42%
Monthly Cost £3/mo
boot.pbstck.com
Other
Costly
Execution 210ms
Transfer 1 KB
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Costly
Execution 209ms
Transfer 144 KB
Unused 42%
Monthly Cost £2/mo
www.belfasttelegraph.co.uk
Other
Costly
Execution 204ms
Transfer 190 KB
Unused 61%
Monthly Cost £2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 188ms
Transfer 188 KB
Unused 70%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 185ms
Transfer 159 KB
Unused 49%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 165ms
Transfer 142 KB
Unused 39%
Monthly Cost £2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 106ms
Transfer 34 KB
Unused 71%
Monthly Cost £1/mo
cdn.cxense.com
Other
Optional
Execution 99ms
Transfer 38 KB
Unused 60%
Monthly Cost £1/mo
sdk.privacy-center.org
Other
Optional
Execution 97ms
Transfer 1 KB
Monthly Cost £1/mo
www.belfasttelegraph.co.uk
Other
Optional
Execution 87ms
Transfer 37 KB
Monthly Cost £1/mo
aswpsdkus.com
Other
Optional
Execution 81ms
Transfer 41 KB
Unused 73%
Monthly Cost £1/mo
www.belfasttelegraph.co.uk
Other
Optional
Execution 72ms
Transfer 180 KB
Unused 67%
Monthly Cost £1/mo
sdk.privacy-center.org
Other
Optional
Execution 58ms
Transfer 134 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.belfasttelegraph.co.uk adds 1574ms and costs ~£16/month
  • www.belfasttelegraph.co.uk adds 895ms and costs ~£9/month
  • Unattributable adds 854ms and costs ~£9/month
  • sdk.privacy-center.org adds 788ms and costs ~£8/month
  • cdn.kaching.eu.com adds 318ms and costs ~£3/month
  • www.belfasttelegraph.co.uk adds 305ms and costs ~£3/month
  • sdk.privacy-center.org adds 303ms and costs ~£3/month
  • boot.pbstck.com adds 210ms and costs ~£2/month
  • Google Tag Manager adds 209ms and costs ~£2/month
  • www.belfasttelegraph.co.uk adds 204ms 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

www.belfasttelegraph.co.uk takes 1574ms 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.belfasttelegraph.co.uk takes 895ms 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 854ms 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

sdk.privacy-center.org takes 788ms 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

cdn.kaching.eu.com takes 318ms 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

77% of cdn.kaching.eu.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.belfasttelegraph.co.uk takes 305ms 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

sdk.privacy-center.org takes 303ms 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

boot.pbstck.com takes 210ms 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 209ms 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.belfasttelegraph.co.uk takes 204ms 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

61% of www.belfasttelegraph.co.uk'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

70% of securepubads.g.doubleclick.net'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

71% of securepubads.g.doubleclick.net'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

60% of cdn.cxense.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

73% of aswpsdkus.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

67% of www.belfasttelegraph.co.uk'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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