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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
88
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.

2.64 s

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

2.93 s

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

76 ms

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

0.069

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

4.24 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.

9.75 s

Page Load Progression

639 ms
1.3 s
1.9 s
2.6 s
3.2 s
3.8 s
4.5 s
5.1 s
Checks
17
8 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 50 requests
FIX
3.6 MB transferred, 50 requests
Warning::
Page weighs 4.1 MB (3.6 MB transferred)
Warning::
Images are 3.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.0 MB
Info::
50 HTTP requests
Info::
Estimated 0.75 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
50 requests
0.75 g CO2 per page load
Images 3.0 MiB 85%
JavaScript 420.5 KiB 11%
CSS 102.2 KiB 3%
Fonts 19.6 KiB 1%
HTML 10.0 KiB 0%
Other 1.6 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 Execution Cost
Action
2043ms total JS execution
FIX
2043ms total JS execution
Warning::
https://uk.com/assets/js/home.js?v=1.0.1: 588ms CPU time
Warning::
https://uk.com/: 557ms CPU time
Warning::
Unattributable: 450ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TMT...: 163ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-Y61C...: 160ms CPU time
Info::
Third-party scripts: 773ms (38% of total)

Main Thread Breakdown

Other 44% Script Evaluation 24% Style & Layout 17% Rendering 9% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://uk.com/assets/js/home.js?v=1.0.1588ms123ms1ms1st
https://uk.com/557ms6ms1ms1st
Unattributable450ms63ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TMT52RF163ms99ms38ms3rd
https://www.googletagmanager.com/gtag/js?id=G-Y61CK76R81&cx=c&gtm=4e64f0160ms120ms39ms3rd
https://uk.com/assets/js/lib/jquery-3.5.1.min.js66ms45ms8ms1st
https://uk.com/assets/js/lib/modernizr.min.js?v=1.059ms29ms1ms1st
D
JS Bundles
Action
8 scripts, 190 KB unused
FIX
8 scripts, 190 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-Y61C...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TMT...: 64 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://uk.com/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.com/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-Y61CK76R81&cx=c&gtm=4e64f0156 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TMT52RF117 KB64 KB (55%)✓3rd
https://uk.com/assets/js/lib/jquery-3.5.1.min.js88 KB60 KB (68%)✓1st
https://uk.com/assets/js/lib/modernizr.min.js?v=1.013 KB—✓1st
https://uk.com/assets/js/main.js?v=1.0.15 KB—✗1st
https://uk.com/assets/js/lib/underscore.min.js?v=1.0.116 KB—✓1st
https://uk.com/assets/js/search.js?v=1.1.016 KB—✗1st
https://uk.com/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
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
https://uk.com/assets/img/table-mobile-ukcom.png?v... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.com/assets/img/logos/ukcom-primary.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.com/assets/img/icons/icon-ukcom-unrestr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.com/assets/img/icons/icon-ukcom-uk-mark... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.com/assets/img/icons/icon-ukcom-seo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.com/assets/img/icons/oversized-icon-ukc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.com/assets/img/icons/icon-ukcom-premium... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.com/assets/img/logos/ukcom-small.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.com/assets/img/icons/icon-ukcom-seamles... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://uk.com/assets/img/logos/ukcom-primary.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35 images 3.0 MB
0 oversized -0 KB
35 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
Page Weight Inventory
Action
50 resources · 3.6 MB · 190 KB savings available
REVIEW
50 resources · 3.6 MB · 190 KB savings available
Warning::
Page weight 2.6 MB over 1MB target
Got: 3.6 MB Expected: ≤ 1 MB
Info::
~190 KB of savings available
Info::
3 third-party resources (7% of weight)
Info::
2 resources over 200KB
50 resources · 3.6 MiB · 3 third-party 2.6 MiB over 1MB target
Image 85% · 3.0 MiB
JavaScript 11% · 420.5 KiB
CSS 3% · 102.2 KiB
Font 1% · 19.6 KiB
Document 0% · 10.0 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
7% third-party, 0 ms blocking
PASS
7% third-party, 0 ms blocking
Info::
Third-party code accounts for 7% of page weight (273.3 KiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
93%
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 FCP 2.6 s LCP 2.9 shttps://uk.com/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2albert-sans-v1-latin-90... https://uk.com/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 9.8 KiB — 292 ms — font-display: swaphttps://uk.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2albert-sans-v1-latin-re... https://uk.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 9.7 KiB — 292 ms — font-display: swap
albert-sans-v1-latin-90... woff2 swap
Size 10 KB
Load time 292 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
albert-sans-v1-latin-re... woff2 swap
Size 10 KB
Load time 292 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
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
50 requests over 2962ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.6 s LCP 2.9 shttps://uk.com// https://uk.com/ — 200 — 10.0 KiB — 486 ms — http/1.1https://uk.com/assets/css/bootstrap-grid.min.css/assets/css/bootstrap-grid.min.css https://uk.com/assets/css/bootstrap-grid.min.css — 200 — 50.5 KiB — 319 ms — http/1.1https://uk.com/assets/css/style.css?v=1.1.6/assets/css/style.css?v=1.1.6 https://uk.com/assets/css/style.css?v=1.1.6 — 200 — 51.7 KiB — 489 ms — http/1.1https://uk.com/assets/js/lib/modernizr.min.js?v=1.0/assets/js/lib/modernizr.min.js?v=1... https://uk.com/assets/js/lib/modernizr.min.js?v=1.0 — 200 — 12.7 KiB — 635 ms — http/1.1https://uk.com/assets/img/logos/ukcom-small.svg/assets/img/logos/ukcom-small.svg https://uk.com/assets/img/logos/ukcom-small.svg — 200 — 3.4 KiB — 479 ms — http/1.1https://uk.com/assets/img/logos/ukcom-primary.png/assets/img/logos/ukcom-primary.png https://uk.com/assets/img/logos/ukcom-primary.png — 200 — 32.5 KiB — 641 ms — http/1.1https://uk.com/assets/img/icons/loader.svg/assets/img/icons/loader.svg https://uk.com/assets/img/icons/loader.svg — 200 — 3.0 KiB — 160 ms — http/1.1https://uk.com/assets/img/icons/icon-ukcom-unrestricted.svg/assets/img/icons/icon-ukcom-unrest... https://uk.com/assets/img/icons/icon-ukcom-unrestricted.svg — 200 — 7.3 KiB — 163 ms — http/1.1https://uk.com/assets/img/icons/icon-ukcom-uk-market.svg/assets/img/icons/icon-ukcom-uk-mar... https://uk.com/assets/img/icons/icon-ukcom-uk-market.svg — 200 — 9.3 KiB — 160 ms — http/1.1https://uk.com/assets/js/lib/jquery-3.5.1.min.js/assets/js/lib/jquery-3.5.1.min.js https://uk.com/assets/js/lib/jquery-3.5.1.min.js — 200 — 87.6 KiB — 476 ms — http/1.1https://uk.com/assets/js/main.js?v=1.0.1/assets/js/main.js?v=1.0.1 https://uk.com/assets/js/main.js?v=1.0.1 — 200 — 5.1 KiB — 165 ms — http/1.1https://uk.com/assets/js/lib/underscore.min.js?v=1.0.1/assets/js/lib/underscore.min.js?v=... https://uk.com/assets/js/lib/underscore.min.js?v=1.0.1 — 200 — 16.3 KiB — 340 ms — http/1.1https://uk.com/assets/js/search.js?v=1.1.0/assets/js/search.js?v=1.1.0 https://uk.com/assets/js/search.js?v=1.1.0 — 200 — 16.2 KiB — 329 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-TMT52RFwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TMT52RF — 200 — 117.2 KiB — 234 ms — h2https://uk.com/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2/assets/fonts/albert-sans/albert-sa... https://uk.com/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 200 — 9.8 KiB — 292 ms — http/1.1https://uk.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2/assets/fonts/albert-sans/albert-sa... https://uk.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 200 — 9.7 KiB — 292 ms — http/1.1https://uk.com/assets/js/home.js?v=1.0.1/assets/js/home.js?v=1.0.1 https://uk.com/assets/js/home.js?v=1.0.1 — 200 — 9.8 KiB — 316 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-Y61CK76R81&cx=c&gtm=4e64f0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-Y61CK76R81&cx=c&gtm=4e64f0 — 200 — 155.6 KiB — 110 ms — h2https://uk.com/assets/img/icons/icon-ukcom-seo.svg/assets/img/icons/icon-ukcom-seo.sv... https://uk.com/assets/img/icons/icon-ukcom-seo.svg — 200 — 6.1 KiB — 162 ms — http/1.1https://uk.com/assets/img/icons/icon-ukcom-premium.svg/assets/img/icons/icon-ukcom-premiu... https://uk.com/assets/img/icons/icon-ukcom-premium.svg — 200 — 5.6 KiB — 168 ms — http/1.1https://uk.com/assets/img/icons/icon-ukcom-seamless.svg/assets/img/icons/icon-ukcom-seamle... https://uk.com/assets/img/icons/icon-ukcom-seamless.svg — 200 — 4.5 KiB — 164 ms — http/1.1https://uk.com/assets/img/icons/oversized-icon-ukcom.svg/assets/img/icons/oversized-icon-uk... https://uk.com/assets/img/icons/oversized-icon-ukcom.svg — 200 — 3.2 KiB — 171 ms — http/1.1https://region1.google-analytics.com/g/collect?v=2&tid=G-Y61CK76R81&gtm=45je64f0v9112027232z89115882070za20gzb9115882070zd9115882070&_p=1776361364711&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=497787116.1776361366&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.55%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=0~115616985~115938466~115938469~117266401&sid=1776361365&sct=1&seg=0&dl=https%3A%2F%2Fuk.com%2F&dt=UK.COM%20%7C%20A%20Powerful%20Domain%20for%20the%20United%20Kingdom&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1601region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-Y61CK76R81&gtm=45je64f0v9112027232z89115882070za20gzb9115882070zd9115882070&_p=1776361364711&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=497787116.1776361366&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.55%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=0~115616985~115938466~115938469~117266401&sid=1776361365&sct=1&seg=0&dl=https%3A%2F%2Fuk.com%2F&dt=UK.COM%20%7C%20A%20Powerful%20Domain%20for%20the%20United%20Kingdom&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1601 — 204 — 543 B — 91 ms — h2https://uk.com/assets/img/table-desktop-ukcom.png?v=2/assets/img/table-desktop-ukcom.png... https://uk.com/assets/img/table-desktop-ukcom.png?v=2 — 200 — 198.5 KiB — 319 ms — http/1.1https://uk.com/assets/img/table-mobile-ukcom.png?v=2/assets/img/table-mobile-ukcom.png?... https://uk.com/assets/img/table-mobile-ukcom.png?v=2 — 200 — 150.0 KiB — 319 ms — http/1.1https://uk.com/assets/img/icons/ukcom-mag-glass-location.svg/assets/img/icons/ukcom-mag-glass-l... https://uk.com/assets/img/icons/ukcom-mag-glass-location.svg — 200 — 2.3 KiB — 161 ms — http/1.1https://uk.com/assets/img/sites/parklife_uk_com.jpg/assets/img/sites/parklife_uk_com.j... https://uk.com/assets/img/sites/parklife_uk_com.jpg — 200 — 291.7 KiB — 818 ms — http/1.1https://uk.com/assets/img/sites/yourleisure_uk_com.jpg/assets/img/sites/yourleisure_uk_co... https://uk.com/assets/img/sites/yourleisure_uk_com.jpg — 200 — 71.5 KiB — 325 ms — http/1.1https://uk.com/assets/img/sites/mitchells_uk_com.jpg/assets/img/sites/mitchells_uk_com.... https://uk.com/assets/img/sites/mitchells_uk_com.jpg — 200 — 113.5 KiB — 504 ms — http/1.1https://uk.com/assets/img/sites/motif_uk_com.jpg/assets/img/sites/motif_uk_com.jpg https://uk.com/assets/img/sites/motif_uk_com.jpg — 200 — 141.0 KiB — 481 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s FCP 2.6 s LCP 2.9 shttps://uk.com// https://uk.com/ — 200 — 10.0 KiB — 486 ms — http/1.1https://uk.com/assets/css/bootstrap-grid.min.css/assets/css/bootstrap-grid.min.css https://uk.com/assets/css/bootstrap-grid.min.css — 200 — 50.5 KiB — 319 ms — http/1.1https://uk.com/assets/css/style.css?v=1.1.6/assets/css/style.css?v=1.1.6 https://uk.com/assets/css/style.css?v=1.1.6 — 200 — 51.7 KiB — 489 ms — http/1.1https://uk.com/assets/js/lib/modernizr.min.js?v=1.0/assets/js/lib/modernizr.min.js?v=1... https://uk.com/assets/js/lib/modernizr.min.js?v=1.0 — 200 — 12.7 KiB — 635 ms — http/1.1https://uk.com/assets/img/logos/ukcom-small.svg/assets/img/logos/ukcom-small.svg https://uk.com/assets/img/logos/ukcom-small.svg — 200 — 3.4 KiB — 479 ms — http/1.1https://uk.com/assets/img/logos/ukcom-primary.png/assets/img/logos/ukcom-primary.png https://uk.com/assets/img/logos/ukcom-primary.png — 200 — 32.5 KiB — 641 ms — http/1.1https://uk.com/assets/img/icons/loader.svg/assets/img/icons/loader.svg https://uk.com/assets/img/icons/loader.svg — 200 — 3.0 KiB — 160 ms — http/1.1https://uk.com/assets/img/icons/icon-ukcom-unrestricted.svg/assets/img/icons/icon-ukcom-unrest... https://uk.com/assets/img/icons/icon-ukcom-unrestricted.svg — 200 — 7.3 KiB — 163 ms — http/1.1https://uk.com/assets/img/icons/icon-ukcom-uk-market.svg/assets/img/icons/icon-ukcom-uk-mar... https://uk.com/assets/img/icons/icon-ukcom-uk-market.svg — 200 — 9.3 KiB — 160 ms — http/1.1https://uk.com/assets/js/lib/jquery-3.5.1.min.js/assets/js/lib/jquery-3.5.1.min.js https://uk.com/assets/js/lib/jquery-3.5.1.min.js — 200 — 87.6 KiB — 476 ms — http/1.1https://uk.com/assets/js/main.js?v=1.0.1/assets/js/main.js?v=1.0.1 https://uk.com/assets/js/main.js?v=1.0.1 — 200 — 5.1 KiB — 165 ms — http/1.1https://uk.com/assets/js/lib/underscore.min.js?v=1.0.1/assets/js/lib/underscore.min.js?v=... https://uk.com/assets/js/lib/underscore.min.js?v=1.0.1 — 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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
38% of JavaScript execution is third-party
First-party Third-party 773ms · 273KB · €8/mo
Unattributable
Other
Costly
Execution 450ms
Transfer 0 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Optional
Execution 163ms
Transfer 117 KB
Unused 55%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 160ms
Transfer 156 KB
Unused 43%
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • Unattributable adds 450ms and costs ~€5/month

Unattributable takes 450ms 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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