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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
2
REVIEW
5
PASS
8
INFO
2

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

Mobile Desktop
66
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
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.

2.63 s

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

5.70 s

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

85 ms

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

0.179

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

3.36 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.

9.15 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 5 REVIEW 2 FIX
D
JS Bundles
Action
8 scripts, 190 KB unused
FIX
8 scripts, 190 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-4VCH...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TQZ...: 64 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://gb.net/assets/js/lib/jquery-3.5.1.min.js: 60 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://gb.net/assets/js/main.js?v=1.0.1: unminified — 2 KB could be saved
Info::
Total unused JavaScript: 190 KB
190 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-4VCHQ2Q1L4&cx=c&gtm=4e64h1h1157 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TQZS3MZJ117 KB64 KB (55%)✓3rd
https://gb.net/assets/js/lib/jquery-3.5.1.min.js88 KB60 KB (68%)✓1st
https://gb.net/assets/js/lib/modernizr.min.js?v=1.013 KB—✓1st
https://gb.net/assets/js/main.js?v=1.0.15 KB—✗1st
https://gb.net/assets/js/lib/underscore.min.js?v=1.0.116 KB—✓1st
https://gb.net/assets/js/search.js?v=1.1.016 KB—✗1st
https://gb.net/assets/js/home.js?v=1.0.110 KB—✗1st

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
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
Page Weight Budget
Action
1.6 MB transferred, 35 requests
REVIEW
1.6 MB transferred, 35 requests
Info::
Page weighs 2.2 MB (1.6 MB transferred)
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
35 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
35 requests
0.34 g CO2 per page load
Images 1.1 MiB 67%
JavaScript 422.3 KiB 25%
CSS 101.7 KiB 6%
Fonts 19.6 KiB 1%
HTML 9.7 KiB 1%
Other 3.4 KiB 0%
Other 542 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
Image Optimization
Action
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Warning::
https://gb.net/assets/img/logos/gbnet-white-single... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://gb.net/assets/img/icons/icon-gbnet-seo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://gb.net/assets/img/icons/icon-gbnet-seamles... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://gb.net/assets/img/table-mobile-gbnet.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://gb.net/assets/img/logos/gbnet-small.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://gb.net/assets/img/logos/gbnet-primary.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://gb.net/assets/img/icons/icon-gbnet-premium... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://gb.net/assets/img/icons/icon-gbnet-unrestr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://gb.net/assets/img/icons/icon-gbnet-market.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://gb.net/assets/img/icons/oversized-icon-gbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
20 images 1.1 MB
0 oversized -0 KB
20 legacy format
10 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

C
JS Execution Cost
Action
1727ms total JS execution
REVIEW
1727ms total JS execution
Warning::
https://gb.net/assets/js/home.js?v=1.0.1: 435ms CPU time
Warning::
https://gb.net/: 424ms CPU time
Warning::
Unattributable: 400ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-4VCH...: 200ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TQZ...: 151ms CPU time
Info::
Third-party scripts: 751ms (43% of total)

Main Thread Breakdown

Other 38% Script Evaluation 29% Style & Layout 18% Rendering 8% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://gb.net/assets/js/home.js?v=1.0.1435ms99ms2ms1st
https://gb.net/424ms6ms2ms1st
Unattributable400ms75ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-4VCHQ2Q1L4&cx=c&gtm=4e64h1h1200ms137ms41ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TQZS3MZJ151ms105ms27ms3rd
https://gb.net/assets/js/lib/modernizr.min.js?v=1.063ms35ms2ms1st
https://gb.net/assets/js/lib/jquery-3.5.1.min.js54ms43ms8ms1st
C
Page Weight Inventory
Action
35 resources · 1.6 MB · 190 KB savings available
REVIEW
35 resources · 1.6 MB · 190 KB savings available
Warning::
Page weight 653 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~190 KB of savings available
Info::
3 third-party resources (16% of weight)
35 resources · 1.6 MiB · 3 third-party 653.1 KiB over 1MB target
Image 67% · 1.1 MiB
JavaScript 25% · 422.3 KiB
CSS 6% · 101.7 KiB
Font 1% · 19.6 KiB
Document 1% · 9.7 KiB
Other 0% · 542 B

~190.2 KiB of savings available

Remove unused JavaScript: 190.2 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
16% third-party, 0 ms blocking
PASS
16% third-party, 0 ms blocking
Info::
Third-party code accounts for 16% of page weight (275.0 KiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
84%
16%
First-party Third-party
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
2 fonts (20 KB)
PASS
2 fonts (20 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

20 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.6 s LCP 5.7 shttps://gb.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2albert-sans-v1-latin-90... https://gb.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 9.8 KiB — 267 ms — font-display: swaphttps://gb.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2albert-sans-v1-latin-re... https://gb.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 9.7 KiB — 290 ms — font-display: swap
albert-sans-v1-latin-90... woff2 swap
Size 10 KB
Load time 267 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
albert-sans-v1-latin-re... woff2 swap
Size 10 KB
Load time 290 ms
Start 1.0 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)
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
35 requests over 2313ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.6 s LCP 5.7 shttps://gb.net// https://gb.net/ — 200 — 9.7 KiB — 481 ms — http/1.1https://gb.net/assets/css/bootstrap-grid.min.css/assets/css/bootstrap-grid.min.css https://gb.net/assets/css/bootstrap-grid.min.css — 200 — 50.5 KiB — 318 ms — http/1.1https://gb.net/assets/css/style.css?v=1.1.3/assets/css/style.css?v=1.1.3 https://gb.net/assets/css/style.css?v=1.1.3 — 200 — 51.2 KiB — 476 ms — http/1.1https://gb.net/assets/js/lib/modernizr.min.js?v=1.0/assets/js/lib/modernizr.min.js?v=1... https://gb.net/assets/js/lib/modernizr.min.js?v=1.0 — 200 — 12.7 KiB — 482 ms — http/1.1https://gb.net/assets/img/logos/gbnet-white-single-color.svg/assets/img/logos/gbnet-white-singl... https://gb.net/assets/img/logos/gbnet-white-single-color.svg — 200 — 6.6 KiB — 481 ms — http/1.1https://gb.net/assets/img/logos/gbnet-small.svg/assets/img/logos/gbnet-small.svg https://gb.net/assets/img/logos/gbnet-small.svg — 200 — 6.2 KiB — 481 ms — http/1.1https://gb.net/assets/img/logos/gbnet-primary.png/assets/img/logos/gbnet-primary.png https://gb.net/assets/img/logos/gbnet-primary.png — 200 — 38.8 KiB — 316 ms — http/1.1https://gb.net/assets/img/icons/loader.svg/assets/img/icons/loader.svg https://gb.net/assets/img/icons/loader.svg — 200 — 3.0 KiB — 160 ms — http/1.1https://gb.net/assets/img/icons/icon-gbnet-unrestricted.svg/assets/img/icons/icon-gbnet-unrest... https://gb.net/assets/img/icons/icon-gbnet-unrestricted.svg — 200 — 7.3 KiB — 164 ms — http/1.1https://gb.net/assets/js/lib/jquery-3.5.1.min.js/assets/js/lib/jquery-3.5.1.min.js https://gb.net/assets/js/lib/jquery-3.5.1.min.js — 200 — 87.6 KiB — 319 ms — http/1.1https://gb.net/assets/js/main.js?v=1.0.1/assets/js/main.js?v=1.0.1 https://gb.net/assets/js/main.js?v=1.0.1 — 200 — 5.1 KiB — 164 ms — http/1.1https://gb.net/assets/js/lib/underscore.min.js?v=1.0.1/assets/js/lib/underscore.min.js?v=... https://gb.net/assets/js/lib/underscore.min.js?v=1.0.1 — 200 — 16.3 KiB — 452 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-TQZS3MZJwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TQZS3MZJ — 200 — 117.4 KiB — 157 ms — h2https://gb.net/assets/img/icons/icon-gbnet-market.svg/assets/img/icons/icon-gbnet-market... https://gb.net/assets/img/icons/icon-gbnet-market.svg — 200 — 9.3 KiB — 298 ms — http/1.1https://gb.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2/assets/fonts/albert-sans/albert-sa... https://gb.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 200 — 9.8 KiB — 267 ms — http/1.1https://gb.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2/assets/fonts/albert-sans/albert-sa... https://gb.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 200 — 9.7 KiB — 290 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-4VCHQ2Q1L4&cx=c&gtm=4e64h1h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-4VCHQ2Q1L4&cx=c&gtm=4e64h1h1 — 200 — 157.1 KiB — 62 ms — h2https://gb.net/assets/js/search.js?v=1.1.0/assets/js/search.js?v=1.1.0 https://gb.net/assets/js/search.js?v=1.1.0 — 200 — 16.4 KiB — 167 ms — http/1.1https://gb.net/assets/js/home.js?v=1.0.1/assets/js/home.js?v=1.0.1 https://gb.net/assets/js/home.js?v=1.0.1 — 200 — 9.8 KiB — 179 ms — http/1.1https://gb.net/assets/img/icons/icon-gbnet-seo.svg/assets/img/icons/icon-gbnet-seo.sv... https://gb.net/assets/img/icons/icon-gbnet-seo.svg — 200 — 6.1 KiB — 164 ms — http/1.1https://gb.net/assets/img/icons/icon-gbnet-premium.svg/assets/img/icons/icon-gbnet-premiu... https://gb.net/assets/img/icons/icon-gbnet-premium.svg — 200 — 5.6 KiB — 160 ms — http/1.1https://gb.net/assets/img/icons/icon-gbnet-seamless.svg/assets/img/icons/icon-gbnet-seamle... https://gb.net/assets/img/icons/icon-gbnet-seamless.svg — 200 — 4.5 KiB — 166 ms — http/1.1https://region1.google-analytics.com/g/collect?v=2&tid=G-4VCHQ2Q1L4&gtm=45je64h1h1v9216915586z89216912888za20gzb9216912888zd9216912888&_p=1776803188845&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1116764690.1776803190&frm=0&pscdl=noapi&rcb=18&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=0~115938465~115938469~117266400&sid=1776803189&sct=1&seg=0&dl=https%3A%2F%2Fgb.net%2F&dt=.GB.NET%20%7C%20A%20Professional%20Domain%20for%20Great%20Britain&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1340region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-4VCHQ2Q1L4&gtm=45je64h1h1v9216915586z89216912888za20gzb9216912888zd9216912888&_p=1776803188845&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1116764690.1776803190&frm=0&pscdl=noapi&rcb=18&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=0~115938465~115938469~117266400&sid=1776803189&sct=1&seg=0&dl=https%3A%2F%2Fgb.net%2F&dt=.GB.NET%20%7C%20A%20Professional%20Domain%20for%20Great%20Britain&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1340 — 204 — 542 B — 90 ms — h2https://gb.net/assets/img/icons/oversized-icon-gbnet.svg/assets/img/icons/oversized-icon-gb... https://gb.net/assets/img/icons/oversized-icon-gbnet.svg — 200 — 4.4 KiB — 159 ms — http/1.1https://gb.net/assets/img/table-desktop-gbnet.png/assets/img/table-desktop-gbnet.png https://gb.net/assets/img/table-desktop-gbnet.png — 200 — 199.8 KiB — 476 ms — http/1.1https://gb.net/assets/img/table-mobile-gbnet.png/assets/img/table-mobile-gbnet.png https://gb.net/assets/img/table-mobile-gbnet.png — 200 — 171.6 KiB — 318 ms — http/1.1https://gb.net/assets/img/icons/gbnet-mag-glass-location.svg/assets/img/icons/gbnet-mag-glass-l... https://gb.net/assets/img/icons/gbnet-mag-glass-location.svg — 200 — 2.3 KiB — 162 ms — http/1.1https://gb.net/assets/img/sites/taekwondo_gb_net.jpg/assets/img/sites/taekwondo_gb_net.... https://gb.net/assets/img/sites/taekwondo_gb_net.jpg — 200 — 123.8 KiB — 476 ms — http/1.1https://gb.net/assets/img/sites/complete_gb_net.jpg/assets/img/sites/complete_gb_net.j... https://gb.net/assets/img/sites/complete_gb_net.jpg — 200 — 164.9 KiB — 652 ms — http/1.1https://gb.net/assets/img/sites/mortgage_gb_net.jpg/assets/img/sites/mortgage_gb_net.j... https://gb.net/assets/img/sites/mortgage_gb_net.jpg — 200 — 125.0 KiB — 318 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.6 s LCP 5.7 shttps://gb.net// https://gb.net/ — 200 — 9.7 KiB — 481 ms — http/1.1https://gb.net/assets/css/bootstrap-grid.min.css/assets/css/bootstrap-grid.min.css https://gb.net/assets/css/bootstrap-grid.min.css — 200 — 50.5 KiB — 318 ms — http/1.1https://gb.net/assets/css/style.css?v=1.1.3/assets/css/style.css?v=1.1.3 https://gb.net/assets/css/style.css?v=1.1.3 — 200 — 51.2 KiB — 476 ms — http/1.1https://gb.net/assets/js/lib/modernizr.min.js?v=1.0/assets/js/lib/modernizr.min.js?v=1... https://gb.net/assets/js/lib/modernizr.min.js?v=1.0 — 200 — 12.7 KiB — 482 ms — http/1.1https://gb.net/assets/img/logos/gbnet-white-single-color.svg/assets/img/logos/gbnet-white-singl... https://gb.net/assets/img/logos/gbnet-white-single-color.svg — 200 — 6.6 KiB — 481 ms — http/1.1https://gb.net/assets/img/logos/gbnet-small.svg/assets/img/logos/gbnet-small.svg https://gb.net/assets/img/logos/gbnet-small.svg — 200 — 6.2 KiB — 481 ms — http/1.1https://gb.net/assets/img/logos/gbnet-primary.png/assets/img/logos/gbnet-primary.png https://gb.net/assets/img/logos/gbnet-primary.png — 200 — 38.8 KiB — 316 ms — http/1.1https://gb.net/assets/img/icons/loader.svg/assets/img/icons/loader.svg https://gb.net/assets/img/icons/loader.svg — 200 — 3.0 KiB — 160 ms — http/1.1https://gb.net/assets/img/icons/icon-gbnet-unrestricted.svg/assets/img/icons/icon-gbnet-unrest... https://gb.net/assets/img/icons/icon-gbnet-unrestricted.svg — 200 — 7.3 KiB — 164 ms — http/1.1https://gb.net/assets/js/lib/jquery-3.5.1.min.js/assets/js/lib/jquery-3.5.1.min.js https://gb.net/assets/js/lib/jquery-3.5.1.min.js — 200 — 87.6 KiB — 319 ms — http/1.1https://gb.net/assets/js/main.js?v=1.0.1/assets/js/main.js?v=1.0.1 https://gb.net/assets/js/main.js?v=1.0.1 — 200 — 5.1 KiB — 164 ms — http/1.1https://gb.net/assets/js/lib/underscore.min.js?v=1.0.1/assets/js/lib/underscore.min.js?v=... https://gb.net/assets/js/lib/underscore.min.js?v=1.0.1 — 200 — 16.3 KiB — 452 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-TQZS3MZJwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TQZS3MZJ — 200 — 117.4 KiB — 157 ms — h2https://gb.net/assets/img/icons/icon-gbnet-market.svg/assets/img/icons/icon-gbnet-market... https://gb.net/assets/img/icons/icon-gbnet-market.svg — 200 — 9.3 KiB — 298 ms — http/1.1https://gb.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2/assets/fonts/albert-sans/albert-sa... https://gb.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 200 — 9.8 KiB — 267 ms — http/1.1https://gb.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2/assets/fonts/albert-sans/albert-sa... https://gb.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 200 — 9.7 KiB — 290 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-4VCHQ2Q1L4&cx=c&gtm=4e64h1h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-4VCHQ2Q1L4&cx=c&gtm=4e64h1h1 — 200 — 157.1 KiB — 62 ms — h2https://gb.net/assets/js/search.js?v=1.1.0/assets/js/search.js?v=1.1.0 https://gb.net/assets/js/search.js?v=1.1.0 — 200 — 16.4 KiB — 167 ms — http/1.1https://gb.net/assets/js/home.js?v=1.0.1/assets/js/home.js?v=1.0.1 https://gb.net/assets/js/home.js?v=1.0.1 — 200 — 9.8 KiB — 179 ms — http/1.1https://gb.net/assets/img/icons/icon-gbnet-seo.svg/assets/img/icons/icon-gbnet-seo.sv... https://gb.net/assets/img/icons/icon-gbnet-seo.svg — 200 — 6.1 KiB — 164 ms — http/1.1https://gb.net/assets/img/icons/icon-gbnet-premium.svg/assets/img/icons/icon-gbnet-premiu... https://gb.net/assets/img/icons/icon-gbnet-premium.svg — 200 — 5.6 KiB — 160 ms — http/1.1https://gb.net/assets/img/icons/icon-gbnet-seamless.svg/assets/img/icons/icon-gbnet-seamle... https://gb.net/assets/img/icons/icon-gbnet-seamless.svg — 200 — 4.5 KiB — 166 ms — http/1.1https://region1.google-analytics.com/g/collect?v=2&tid=G-4VCHQ2Q1L4&gtm=45je64h1h1v9216915586z89216912888za20gzb9216912888zd9216912888&_p=1776803188845&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1116764690.1776803190&frm=0&pscdl=noapi&rcb=18&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=0~115938465~115938469~117266400&sid=1776803189&sct=1&seg=0&dl=https%3A%2F%2Fgb.net%2F&dt=.GB.NET%20%7C%20A%20Professional%20Domain%20for%20Great%20Britain&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1340region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-4VCHQ2Q1L4&gtm=45je64h1h1v9216915586z89216912888za20gzb9216912888zd9216912888&_p=1776803188845&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1116764690.1776803190&frm=0&pscdl=noapi&rcb=18&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=0~115938465~115938469~117266400&sid=1776803189&sct=1&seg=0&dl=https%3A%2F%2Fgb.net%2F&dt=.GB.NET%20%7C%20A%20Professional%20Domain%20for%20Great%20Britain&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1340 — 204 — 542 B — 90 ms — h2https://gb.net/assets/img/icons/oversized-icon-gbnet.svg/assets/img/icons/oversized-icon-gb... https://gb.net/assets/img/icons/oversized-icon-gbnet.svg — 200 — 4.4 KiB — 159 ms — http/1.1https://gb.net/assets/img/table-desktop-gbnet.png/assets/img/table-desktop-gbnet.png https://gb.net/assets/img/table-desktop-gbnet.png — 200 — 199.8 KiB — 476 ms — http/1.1https://gb.net/assets/img/table-mobile-gbnet.png/assets/img/table-mobile-gbnet.png https://gb.net/assets/img/table-mobile-gbnet.png — 200 — 171.6 KiB — 318 ms — http/1.1https://gb.net/assets/img/icons/gbnet-mag-glass-location.svg/assets/img/icons/gbnet-mag-glass-l... https://gb.net/assets/img/icons/gbnet-mag-glass-location.svg — 200 — 2.3 KiB — 162 ms — http/1.1https://gb.net/assets/img/sites/taekwondo_gb_net.jpg/assets/img/sites/taekwondo_gb_net.... https://gb.net/assets/img/sites/taekwondo_gb_net.jpg — 200 — 123.8 KiB — 476 ms — http/1.1https://gb.net/assets/img/sites/complete_gb_net.jpg/assets/img/sites/complete_gb_net.j... https://gb.net/assets/img/sites/complete_gb_net.jpg — 200 — 164.9 KiB — 652 ms — http/1.1https://gb.net/assets/img/sites/mortgage_gb_net.jpg/assets/img/sites/mortgage_gb_net.j... https://gb.net/assets/img/sites/mortgage_gb_net.jpg — 200 — 125.0 KiB — 318 ms — http/1.1https://gb.net/assets/img/sites/psp_gb_net.jpg/assets/img/sites/psp_gb_net.jpg https://gb.net/assets/img/sites/psp_gb_net.jpg — 200 — 71.6 KiB — 316 ms — http/1.1https://gb.net/assets/img/sites/innovation_gb_net.jpg/assets/img/sites/innovation_gb_net... https://gb.net/assets/img/sites/innovation_gb_net.jpg — 200 — 60.6 KiB — 160 ms — http/1.1https://gb.net/assets/img/sites/paragon_gb_net.jpg/assets/img/sites/paragon_gb_net.jp... https://gb.net/assets/img/sites/paragon_gb_net.jpg — 200 — 107.9 KiB — 161 ms — http/1.1https://gb.net/assets/img/icons/baseline-open_in_new-24px.svg/assets/img/icons/baseline-open_in_... https://gb.net/assets/img/icons/baseline-open_in_new-24px.svg — 200 — 795 B — 160 ms — http/1.1https://gb.net/assets/img/favicon-32x32.png?v=3/assets/img/favicon-32x32.png?v=3 https://gb.net/assets/img/favicon-32x32.png?v=3 — 200 — 3.4 KiB — 165 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
43% of JavaScript execution is third-party
First-party Third-party 751ms · 274KB · €8/mo
Unattributable
Other
Costly
Execution 400ms
Transfer 0 KB
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Optional
Execution 200ms
Transfer 157 KB
Unused 42%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 151ms
Transfer 117 KB
Unused 55%
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • Unattributable adds 400ms and costs ~€4/month

43% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 400ms 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

55% of Google Tag Manager'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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