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https://uk.net

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
76
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.

1.89 s

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

1.89 s

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

8 ms

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

0.098

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

1.89 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.

2.46 s

Page Load Progression

661 ms
1.3 s
2.0 s
2.6 s
3.3 s
4.0 s
4.6 s
5.3 s
Checks
15
6 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 42 requests
FIX
2.9 MB transferred, 42 requests
Warning::
Page weighs 3.4 MB (2.9 MB transferred)
Warning::
Images are 2.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.4 MB
Info::
42 HTTP requests
Info::
Estimated 0.61 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
42 requests
0.61 g CO2 per page load
Images 2.4 MiB 81%
JavaScript 422.2 KiB 14%
CSS 101.6 KiB 3%
Fonts 19.6 KiB 1%
HTML 9.8 KiB 0%
Other 2.9 KiB 0%
Other 543 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

D
JS Bundles
Action
8 scripts, 190 KB unused
FIX
8 scripts, 190 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7WED...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KL8...: 64 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://uk.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://uk.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-7WEDK3F99Y&cx=c&gtm=4e64h1h1157 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KL89ZPSD117 KB64 KB (55%)✓3rd
https://uk.net/assets/js/lib/jquery-3.5.1.min.js88 KB60 KB (68%)✓1st
https://uk.net/assets/js/lib/modernizr.min.js?v=1.013 KB—✓1st
https://uk.net/assets/js/main.js?v=1.0.15 KB—✗1st
https://uk.net/assets/js/lib/underscore.min.js?v=1.0.116 KB—✓1st
https://uk.net/assets/js/search.js?v=1.1.016 KB—✗1st
https://uk.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
Image Optimization
Action
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Warning::
https://uk.net/assets/img/icons/icon-uknet-premium... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.net/assets/img/icons/icon-uknet-seamles... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.net/assets/img/logos/uknet-blue-single-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.net/assets/img/icons/icon-uknet-uk-mark... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.net/assets/img/icons/icon-uknet-seo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.net/assets/img/logos/uknet-primary.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.net/assets/img/icons/icon-uknet-unrestr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.net/assets/img/table-desktop-uknet.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.net/assets/img/icons/uknet-mag-glass-lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
27 images 2.4 MB
0 oversized -0 KB
27 legacy format
9 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

B
JS Execution Cost
546ms total JS execution
REVIEW
546ms total JS execution
Info::
https://uk.net/: 157ms CPU time
Info::
Unattributable: 151ms CPU time
Info::
https://uk.net/assets/js/home.js?v=1.0.1: 112ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-7WED...: 71ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KL8...: 54ms CPU time
Warning::
Third-party scripts: 277ms (51% of total)

Main Thread Breakdown

Other 37% Script Evaluation 30% Style & Layout 18% Rendering 8% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://uk.net/157ms2ms0ms1st
Unattributable151ms30ms0ms3rd
https://uk.net/assets/js/home.js?v=1.0.1112ms24ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-7WEDK3F99Y&cx=c&gtm=4e64h1h171ms51ms16ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KL89ZPSD54ms39ms12ms3rd
C
Page Weight Inventory
Action
42 resources · 2.9 MB · 190 KB savings available
REVIEW
42 resources · 2.9 MB · 190 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~190 KB of savings available
Info::
3 third-party resources (9% of weight)
Info::
1 resources over 200KB
42 resources · 2.9 MiB · 3 third-party 1.9 MiB over 1MB target
Image 81% · 2.4 MiB
JavaScript 14% · 422.2 KiB
CSS 3% · 101.6 KiB
Font 1% · 19.6 KiB
Document 0% · 9.8 KiB
Other 0% · 543 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
9% third-party, 0 ms blocking
PASS
9% third-party, 0 ms blocking
Info::
Third-party code accounts for 9% of page weight (274.9 KiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
91%
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 500 ms 1.0 s 1.5 s FCP 1.9 s LCP 1.9 shttps://uk.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2albert-sans-v1-latin-re... https://uk.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 9.7 KiB — 306 ms — font-display: swaphttps://uk.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2albert-sans-v1-latin-90... https://uk.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 9.8 KiB — 307 ms — font-display: swap
albert-sans-v1-latin-re... woff2 swap
Size 10 KB
Load time 306 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
albert-sans-v1-latin-90... woff2 swap
Size 10 KB
Load time 307 ms
Start 1.2 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
Network Waterfall
42 requests over 2974ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.9 s LCP 1.9 shttps://uk.net// https://uk.net/ — 200 — 9.8 KiB — 565 ms — http/1.1https://uk.net/assets/css/bootstrap-grid.min.css/assets/css/bootstrap-grid.min.css https://uk.net/assets/css/bootstrap-grid.min.css — 200 — 50.5 KiB — 375 ms — http/1.1https://uk.net/assets/css/style.css?v=1.1.3/assets/css/style.css?v=1.1.3 https://uk.net/assets/css/style.css?v=1.1.3 — 200 — 51.1 KiB — 571 ms — http/1.1https://uk.net/assets/js/lib/modernizr.min.js?v=1.0/assets/js/lib/modernizr.min.js?v=1... https://uk.net/assets/js/lib/modernizr.min.js?v=1.0 — 200 — 12.7 KiB — 562 ms — http/1.1https://uk.net/assets/img/logos/uknet-blue-single-color.svg/assets/img/logos/uknet-blue-single... https://uk.net/assets/img/logos/uknet-blue-single-color.svg — 200 — 6.3 KiB — 568 ms — http/1.1https://uk.net/assets/img/logos/uknet-primary.png/assets/img/logos/uknet-primary.png https://uk.net/assets/img/logos/uknet-primary.png — 200 — 31.6 KiB — 762 ms — http/1.1https://uk.net/assets/img/icons/loader.svg/assets/img/icons/loader.svg https://uk.net/assets/img/icons/loader.svg — 200 — 3.0 KiB — 193 ms — http/1.1https://uk.net/assets/img/icons/icon-uknet-unrestricted.svg/assets/img/icons/icon-uknet-unrest... https://uk.net/assets/img/icons/icon-uknet-unrestricted.svg — 200 — 7.3 KiB — 196 ms — http/1.1https://uk.net/assets/img/icons/icon-uknet-uk-market.svg/assets/img/icons/icon-uknet-uk-mar... https://uk.net/assets/img/icons/icon-uknet-uk-market.svg — 200 — 9.3 KiB — 196 ms — http/1.1https://uk.net/assets/js/lib/jquery-3.5.1.min.js/assets/js/lib/jquery-3.5.1.min.js https://uk.net/assets/js/lib/jquery-3.5.1.min.js — 200 — 87.6 KiB — 601 ms — http/1.1https://uk.net/assets/js/main.js?v=1.0.1/assets/js/main.js?v=1.0.1 https://uk.net/assets/js/main.js?v=1.0.1 — 200 — 5.1 KiB — 383 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-KL89ZPSDwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KL89ZPSD — 200 — 117.3 KiB — 32 ms — h2https://uk.net/assets/img/icons/baseline-open_in_new-24px.svg/assets/img/icons/baseline-open_in_... https://uk.net/assets/img/icons/baseline-open_in_new-24px.svg — 200 — 795 B — 340 ms — http/1.1https://uk.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2/assets/fonts/albert-sans/albert-sa... https://uk.net/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 200 — 9.7 KiB — 306 ms — http/1.1https://uk.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2/assets/fonts/albert-sans/albert-sa... https://uk.net/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 200 — 9.8 KiB — 307 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-7WEDK3F99Y&cx=c&gtm=4e64h1h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-7WEDK3F99Y&cx=c&gtm=4e64h1h1 — 200 — 157.1 KiB — 28 ms — h2https://uk.net/assets/js/lib/underscore.min.js?v=1.0.1/assets/js/lib/underscore.min.js?v=... https://uk.net/assets/js/lib/underscore.min.js?v=1.0.1 — 200 — 16.3 KiB — 357 ms — http/1.1https://www.google-analytics.com/g/collect?v=2&tid=G-7WEDK3F99Y&gtm=45je64h1h1v9216915986z89216912899za20gzb9216912899zd9216912899&_p=1776800487945&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=100841294.1776800489&frm=0&pscdl=noapi&rcb=9&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938468~117266401&sid=1776800488&sct=1&seg=0&dl=https%3A%2F%2Fuk.net%2F&dt=.UK.NET%20%7C%20A%20Global%20Domain%20for%20Building%20Your%20Presence%20in%20the%20UK&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1422www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-7WEDK3F99Y&gtm=45je64h1h1v9216915986z89216912899za20gzb9216912899zd9216912899&_p=1776800487945&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=100841294.1776800489&frm=0&pscdl=noapi&rcb=9&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938468~117266401&sid=1776800488&sct=1&seg=0&dl=https%3A%2F%2Fuk.net%2F&dt=.UK.NET%20%7C%20A%20Global%20Domain%20for%20Building%20Your%20Presence%20in%20the%20UK&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1422 — 204 — 543 B — 15 ms — h2https://uk.net/assets/js/search.js?v=1.1.0/assets/js/search.js?v=1.1.0 https://uk.net/assets/js/search.js?v=1.1.0 — 200 — 16.3 KiB — 195 ms — http/1.1https://uk.net/assets/js/home.js?v=1.0.1/assets/js/home.js?v=1.0.1 https://uk.net/assets/js/home.js?v=1.0.1 — 200 — 9.8 KiB — 209 ms — http/1.1https://uk.net/assets/img/icons/icon-uknet-seo.svg/assets/img/icons/icon-uknet-seo.sv... https://uk.net/assets/img/icons/icon-uknet-seo.svg — 200 — 6.1 KiB — 196 ms — http/1.1https://uk.net/assets/img/icons/icon-uknet-premium.svg/assets/img/icons/icon-uknet-premiu... https://uk.net/assets/img/icons/icon-uknet-premium.svg — 200 — 5.6 KiB — 198 ms — http/1.1https://uk.net/assets/img/icons/icon-uknet-seamless.svg/assets/img/icons/icon-uknet-seamle... https://uk.net/assets/img/icons/icon-uknet-seamless.svg — 200 — 4.5 KiB — 190 ms — http/1.1https://uk.net/assets/img/icons/oversized-icon-uknet.svg/assets/img/icons/oversized-icon-uk... https://uk.net/assets/img/icons/oversized-icon-uknet.svg — 200 — 4.0 KiB — 192 ms — http/1.1https://uk.net/assets/img/table-desktop-uknet.png/assets/img/table-desktop-uknet.png https://uk.net/assets/img/table-desktop-uknet.png — 200 — 198.5 KiB — 382 ms — http/1.1https://uk.net/assets/img/table-mobile-uknet.png/assets/img/table-mobile-uknet.png https://uk.net/assets/img/table-mobile-uknet.png — 200 — 150.0 KiB — 387 ms — http/1.1https://uk.net/assets/img/icons/uknet-mag-glass-location.svg/assets/img/icons/uknet-mag-glass-l... https://uk.net/assets/img/icons/uknet-mag-glass-location.svg — 200 — 2.3 KiB — 195 ms — http/1.1https://uk.net/assets/img/sites/sel_uk_net.jpg/assets/img/sites/sel_uk_net.jpg https://uk.net/assets/img/sites/sel_uk_net.jpg — 200 — 116.4 KiB — 397 ms — http/1.1https://uk.net/assets/img/sites/motorclub_uk_net.jpg/assets/img/sites/motorclub_uk_net.... https://uk.net/assets/img/sites/motorclub_uk_net.jpg — 200 — 281.1 KiB — 755 ms — http/1.1https://uk.net/assets/img/sites/wfa_uk_net.jpg/assets/img/sites/wfa_uk_net.jpg https://uk.net/assets/img/sites/wfa_uk_net.jpg — 200 — 133.3 KiB — 387 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s FCP 1.9 s LCP 1.9 shttps://uk.net// https://uk.net/ — 200 — 9.8 KiB — 565 ms — http/1.1https://uk.net/assets/css/bootstrap-grid.min.css/assets/css/bootstrap-grid.min.css https://uk.net/assets/css/bootstrap-grid.min.css — 200 — 50.5 KiB — 375 ms — http/1.1https://uk.net/assets/css/style.css?v=1.1.3/assets/css/style.css?v=1.1.3 https://uk.net/assets/css/style.css?v=1.1.3 — 200 — 51.1 KiB — 571 ms — http/1.1https://uk.net/assets/js/lib/modernizr.min.js?v=1.0/assets/js/lib/modernizr.min.js?v=1... https://uk.net/assets/js/lib/modernizr.min.js?v=1.0 — 200 — 12.7 KiB — 562 ms — http/1.1https://uk.net/assets/img/logos/uknet-blue-single-color.svg/assets/img/logos/uknet-blue-single... https://uk.net/assets/img/logos/uknet-blue-single-color.svg — 200 — 6.3 KiB — 568 ms — http/1.1https://uk.net/assets/img/logos/uknet-primary.png/assets/img/logos/uknet-primary.png https://uk.net/assets/img/logos/uknet-primary.png — 200 — 31.6 KiB — 762 ms — http/1.1https://uk.net/assets/img/icons/loader.svg/assets/img/icons/loader.svg https://uk.net/assets/img/icons/loader.svg — 200 — 3.0 KiB — 193 ms — http/1.1https://uk.net/assets/img/icons/icon-uknet-unrestricted.svg/assets/img/icons/icon-uknet-unrest... https://uk.net/assets/img/icons/icon-uknet-unrestricted.svg — 200 — 7.3 KiB — 196 ms — http/1.1https://uk.net/assets/img/icons/icon-uknet-uk-market.svg/assets/img/icons/icon-uknet-uk-mar... https://uk.net/assets/img/icons/icon-uknet-uk-market.svg — 200 — 9.3 KiB — 196 ms — http/1.1https://uk.net/assets/js/lib/jquery-3.5.1.min.js/assets/js/lib/jquery-3.5.1.min.js https://uk.net/assets/js/lib/jquery-3.5.1.min.js — 200 — 87.6 KiB — 601 ms — http/1.1https://uk.net/assets/js/main.js?v=1.0.1/assets/js/main.js?v=1.0.1 https://uk.net/assets/js/main.js?v=1.0.1 — 200 — 5.1 KiB — 383 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-KL89ZPSDwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KL89ZPSD — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
51% of JavaScript execution is third-party
First-party Third-party 277ms · 274KB · €3/mo
Unattributable
Other
Optional
Execution 151ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 157 KB
Unused 42%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 54ms
Transfer 117 KB
Unused 55%
Monthly Cost €1/mo

51% 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

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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