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https://skysports.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
83
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
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.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

732 ms

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

1.80 s

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

26 ms

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

0.189

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

983 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.81 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
15
7 PASS 4 REVIEW 2 FIX
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 (1.0 MiB of 1.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Warning::
https://img.skysports.com/commercial/logos/sky-bet... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://e0.365dm.com/tvlogos/channels/Sky-Sports-L... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://e0.365dm.com/logos/sky-news-logo.svg?bypas... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img001-eu-mo-prd.delivery.skycdp.com/selec... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.skysports.com/assets/ui-graphics/ui-si... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
13 images 195 KB
0 oversized -0 KB
11 legacy format
6 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Execution Cost
671ms total JS execution
REVIEW
671ms total JS execution
Info::
https://www.skysports.com/BtymJ/5qB/crZo/YF/VA7oft...: 224ms CPU time
Info::
Unattributable: 160ms CPU time
Info::
https://www.skysports.com/: 146ms CPU time
Info::
https://www.skysports.com/js/modules-es6/ui-sitewi...: 141ms CPU time
Warning::
Third-party scripts: 671ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 23% Style & Layout 11% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.skysports.com/BtymJ/5qB/crZo/YF/VA7oft/SJJOGD5YkO/KHAxAQ/WD44X3Z/gVFwPAg?v=34252489-71db-f8cb-59c3-9b6004c80214224ms212ms9ms3rd
Unattributable160ms56ms0ms3rd
https://www.skysports.com/146ms24ms4ms3rd
https://www.skysports.com/js/modules-es6/ui-sitewide-carousel-19f58aa5e7e485a4692a.js141ms66ms0ms3rd
B
JS Bundles
20 scripts, 119 KB unused
REVIEW
20 scripts, 119 KB unused
Warning::
https://browser.covatic.io/sdk/v1/sky.js: 49 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.skysports.com/BtymJ/5qB/crZo/YF/VA7oft...: 30 KB unused (20%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.skysports.com/js/modules-es6/live-comp...: 20 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.skysports.com/js/modules-es6/omniture-...: 20 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 119 KB
119 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://browser.covatic.io/sdk/v1/sky.js79 KB49 KB (62%)✓3rd
https://www.skysports.com/BtymJ/5qB/crZo/YF/VA7oft/SJJOGD5YkO/KHAxAQ/WD44X3Z/gVFwPAg?v=34252489-71db-f8cb-59c3-9b6004c80214149 KB30 KB (20%)✓3rd
https://www.skysports.com/js/modules-es6/live-components-dbdf09661b7430450c77.js23 KB20 KB (89%)✓3rd
https://www.skysports.com/js/modules-es6/omniture-91d9d1cba05d0a55199c.js20 KB20 KB (100%)✓3rd
https://www.skysports.com/js/modules-es6/ui-sitewide-tiles-rail-35ec8f476bd936861e18.js1 KB—✓3rd
https://www.skysports.com/js/modules-es6/ui-token-refresh-d7a91688ca8369a4c1c4.js1 KB—✓3rd
https://uk-script.dotmetrics.net/door.js?id=117265 KB—✓3rd
https://www.skysports.com/js/modules-es6/sdc-site-a11y-skip-links-88990499e3986aafde68.js0 KB—✓3rd
https://www.skysports.com/js/modules-es6/ui-digrev-footer-389e3800d818652527a1.js1 KB—✓3rd
https://www.skysports.com/js/modules-es6/ui-digrev-header-a6a7b2a813f54a217527.js1 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
1.0 MB transferred, 56 requests
PASS
1.0 MB transferred, 56 requests
Info::
Page weighs 3.0 MB (1.0 MB transferred)
Info::
Fonts are 232 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 232 KB
Info::
56 HTTP requests
Info::
Estimated 0.21 g CO2 per page load
1.0 MB / 2.4 MB budget
1.0 MB transferred
56 requests
0.21 g CO2 per page load
JavaScript 453.5 KiB 44%
Fonts 232.2 KiB 22%
Images 194.7 KiB 19%
CSS 96.1 KiB 9%
HTML 45.7 KiB 4%
Other 9.7 KiB 1%
Other 5.6 KiB 1%
Other 2.2 KiB 0%
Other 1.0 KiB 0%
0 2.4 MB 4.9 MB
Under budget

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

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
8 fonts (232 KB)
PASS
8 fonts (232 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

232 KB total

Render-blocking

0

of 8

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 732 ms LCP 1.8 shttps://www.skysports.com/assets/fonts/sky-regular.woffsky-regular.woff https://www.skysports.com/assets/fonts/sky-regular.woff — 28.1 KiB — 15 ms — font-display: swaphttps://www.skysports.com/assets/fonts/sky-display-medium.woffsky-display-medium.woff https://www.skysports.com/assets/fonts/sky-display-medium.woff — 21.0 KiB — 17 ms — font-display: swaphttps://www.skysports.com/assets/fonts/sky-medium.woffsky-medium.woff https://www.skysports.com/assets/fonts/sky-medium.woff — 27.6 KiB — 18 ms — font-display: swaphttps://www.skysports.com/assets/fonts/sky-sports-brand-2026-medium.woff2sky-sports-brand-2026-m... https://www.skysports.com/assets/fonts/sky-sports-brand-2026-medium.woff2 — 38.5 KiB — 13 ms — font-display: swaphttps://www.skysports.com/assets/fonts/sky-sports-brand-2026-light.woff2sky-sports-brand-2026-l... https://www.skysports.com/assets/fonts/sky-sports-brand-2026-light.woff2 — 38.0 KiB — 11 ms — font-display: swaphttps://www.skysports.com/assets/fonts/sky-regular.woff?r=20181120sky-regular.woff https://www.skysports.com/assets/fonts/sky-regular.woff?r=20181120 — 28.2 KiB — 12 ms — font-display: swaphttps://static.skyassets.com/fonts/sky-medium.woff2sky-medium.woff2 https://static.skyassets.com/fonts/sky-medium.woff2 — 25.3 KiB — 16 ms — font-display: swaphttps://static.skyassets.com/fonts/sky-regular.woff2sky-regular.woff2 https://static.skyassets.com/fonts/sky-regular.woff2 — 25.5 KiB — 24 ms — font-display: swap
sky-regular.woff woff swap
Size 28 KB
Load time 15 ms
Start 247 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
sky-display-medium.woff woff swap
Size 21 KB
Load time 17 ms
Start 247 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
sky-medium.woff woff swap
Size 28 KB
Load time 18 ms
Start 248 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
sky-sports-brand-2026-m... woff2 swap
Size 38 KB
Load time 13 ms
Start 349 ms
Risk FOUT — text flashes from fallback to web font
sky-sports-brand-2026-l... woff2 swap
Size 38 KB
Load time 11 ms
Start 349 ms
Risk FOUT — text flashes from fallback to web font
sky-regular.woff woff swap
Size 28 KB
Load time 12 ms
Start 406 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
sky-medium.woff2 woff2 swap
Size 25 KB
Load time 16 ms
Start 852 ms
Risk FOUT — text flashes from fallback to web font
sky-regular.woff2 woff2 swap
Size 25 KB
Load time 24 ms
Start 853 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)

Fixing the unchecked items could save ~32 KB and ~64 ms

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
Page Weight Inventory
56 resources · 1.0 MB · 119 KB savings available
PASS
56 resources · 1.0 MB · 119 KB savings available
Warning::
Page weight 17 KB over 1MB target
Got: 1.0 MB Expected: ≤ 1 MB
Info::
~119 KB of savings available
Warning::
55 third-party resources (100% of weight)
56 resources · 1.0 MiB · 55 third-party 16.7 KiB over 1MB target
JavaScript 44% · 453.5 KiB
Font 22% · 232.2 KiB
Image 19% · 200.0 KiB
CSS 9% · 96.1 KiB
Document 4% · 46.0 KiB
Other 1% · 12.9 KiB

~119.3 KiB of savings available

Remove unused JavaScript: 119.3 KiB
Network Waterfall
56 requests over 877ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 732 ms LCP 1.8 shttps://skysports.com// https://skysports.com/ — 301 — 248 B — 83 ms — http/1.1https://www.skysports.com/www.skysports.com/ https://www.skysports.com/ — 200 — 43.5 KiB — 154 ms — h2https://www.skysports.com/assets/fonts/sky-regular.woffwww.skysports.com/assets/fonts/sky-... https://www.skysports.com/assets/fonts/sky-regular.woff — 200 — 28.1 KiB — 15 ms — h2https://www.skysports.com/assets/fonts/sky-display-medium.woffwww.skysports.com/assets/fonts/sky-... https://www.skysports.com/assets/fonts/sky-display-medium.woff — 200 — 21.0 KiB — 17 ms — h2https://www.skysports.com/assets/fonts/sky-medium.woffwww.skysports.com/assets/fonts/sky-... https://www.skysports.com/assets/fonts/sky-medium.woff — 200 — 27.6 KiB — 18 ms — h2https://www.skysports.com/css/min/site-main-sass-5bcd50fca8c173cf8603b140669bf171.csswww.skysports.com/css/min/site-main... https://www.skysports.com/css/min/site-main-sass-5bcd50fca8c173cf8603b140669bf171.css — 200 — 89.4 KiB — 25 ms — h2https://www.skysports.com/assets/ui-graphics/ui-site-header-sky-sports-logo.svgwww.skysports.com/assets/ui-graphic... https://www.skysports.com/assets/ui-graphics/ui-site-header-sky-sports-logo.svg — 200 — 2.8 KiB — 18 ms — h2https://img.skysports.com/commercial/logos/sky-bet-logo.svg?bypass-service-workerimg.skysports.com/commercial/logos/... https://img.skysports.com/commercial/logos/sky-bet-logo.svg?bypass-service-worker — 200 — 2.7 KiB — 28 ms — http/1.1https://e0.365dm.com/logos/sky-news-logo.svg?bypass-service-workere0.365dm.com/logos/sky-news-logo.sv... https://e0.365dm.com/logos/sky-news-logo.svg?bypass-service-worker — 200 — 3.3 KiB — 27 ms — h2https://e0.365dm.com/tvlogos/channels/Sky-Sports-Logo.svge0.365dm.com/tvlogos/channels/Sky-S... https://e0.365dm.com/tvlogos/channels/Sky-Sports-Logo.svg — 200 — 2.4 KiB — 22 ms — h2https://www.skysports.com/assets/manifest.jsonwww.skysports.com/assets/manifest.j... https://www.skysports.com/assets/manifest.json — 200 — 1.0 KiB — 12 ms — h2https://cdn.privacy-mgmt.com/unified/wrapperMessagingWithoutDetection.jscdn.privacy-mgmt.com/unified/wrappe... https://cdn.privacy-mgmt.com/unified/wrapperMessagingWithoutDetection.js — 200 — 42.0 KiB — 12 ms — h2https://www.skysports.com/BtymJ/5qB/crZo/YF/VA7oft/SJJOGD5YkO/KHAxAQ/WD44X3Z/gVFwPAg?v=34252489-71db-f8cb-59c3-9b6004c80214www.skysports.com/BtymJ/5qB/crZo/YF... https://www.skysports.com/BtymJ/5qB/crZo/YF/VA7oft/SJJOGD5YkO/KHAxAQ/WD44X3Z/gVFwPAg?v=34252489-71db-f8cb-59c3-9b6004c80214 — 200 — 149.1 KiB — 19 ms — h2https://www.skysports.com/assets/ui-graphics/ui-site-header-noise.pngwww.skysports.com/assets/ui-graphic... https://www.skysports.com/assets/ui-graphics/ui-site-header-noise.png — 200 — 22.7 KiB — 11 ms — h2data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMyIgaGVpZ…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMyIgaGVpZ… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNgYAAAAAMAASsJTYQAA…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNgYAAAAAMAASsJTYQAA… — 200 — 68 B — 60 ms — datahttps://img001-eu-mo-prd.delivery.skycdp.com/select/logo?entityId=6858995960279493117&width=600&height=50&rule=SkySportsDarkimg001-eu-mo-prd.delivery.skycdp.co... https://img001-eu-mo-prd.delivery.skycdp.com/select/logo?entityId=6858995960279493117&width=600&height=50&rule=SkySportsDark — 200 — 4.6 KiB — 56 ms — h2https://www.skysports.com/assets/fonts/sky-sports-brand-2026-medium.woff2www.skysports.com/assets/fonts/sky-... https://www.skysports.com/assets/fonts/sky-sports-brand-2026-medium.woff2 — 200 — 38.5 KiB — 13 ms — h2https://www.skysports.com/assets/fonts/sky-sports-brand-2026-light.woff2www.skysports.com/assets/fonts/sky-... https://www.skysports.com/assets/fonts/sky-sports-brand-2026-light.woff2 — 200 — 38.0 KiB — 11 ms — h2https://uk-script.dotmetrics.net/door.js?id=11726uk-script.dotmetrics.net/door.js?id... https://uk-script.dotmetrics.net/door.js?id=11726 — 200 — 4.5 KiB — 54 ms — h2https://www.skysports.com/assets/fonts/sky-regular.woff?r=20181120www.skysports.com/assets/fonts/sky-... https://www.skysports.com/assets/fonts/sky-regular.woff?r=20181120 — 200 — 28.2 KiB — 12 ms — h2https://www.skysports.com/js/modules-es6/sdc-site-pub-sub-6566e883439e722046e7.jswww.skysports.com/js/modules-es6/sd... https://www.skysports.com/js/modules-es6/sdc-site-pub-sub-6566e883439e722046e7.js — 200 — 738 B — 19 ms — h2https://www.skysports.com/js/modules-es6/live-components-dbdf09661b7430450c77.jswww.skysports.com/js/modules-es6/li... https://www.skysports.com/js/modules-es6/live-components-dbdf09661b7430450c77.js — 200 — 23.4 KiB — 18 ms — h2https://browser.covatic.io/sdk/v1/sky.jsbrowser.covatic.io/sdk/v1/sky.js https://browser.covatic.io/sdk/v1/sky.js — 200 — 79.3 KiB — 18 ms — h2https://www.skysports.com/js/modules-es6/omniture-91d9d1cba05d0a55199c.jswww.skysports.com/js/modules-es6/om... https://www.skysports.com/js/modules-es6/omniture-91d9d1cba05d0a55199c.js — 200 — 20.4 KiB — 13 ms — h2https://www.skysports.com/js/modules-es6/sdc-site-a11y-skip-links-88990499e3986aafde68.jswww.skysports.com/js/modules-es6/sd... https://www.skysports.com/js/modules-es6/sdc-site-a11y-skip-links-88990499e3986aafde68.js — 200 — 472 B — 11 ms — h2https://www.skysports.com/js/modules-es6/ui-digrev-footer-389e3800d818652527a1.jswww.skysports.com/js/modules-es6/ui... https://www.skysports.com/js/modules-es6/ui-digrev-footer-389e3800d818652527a1.js — 200 — 1.2 KiB — 21 ms — h2https://www.skysports.com/js/modules-es6/ui-digrev-header-a6a7b2a813f54a217527.jswww.skysports.com/js/modules-es6/ui... https://www.skysports.com/js/modules-es6/ui-digrev-header-a6a7b2a813f54a217527.js — 200 — 1.2 KiB — 21 ms — h2https://www.skysports.com/js/modules-es6/ui-sitewide-tiles-rail-35ec8f476bd936861e18.jswww.skysports.com/js/modules-es6/ui... https://www.skysports.com/js/modules-es6/ui-sitewide-tiles-rail-35ec8f476bd936861e18.js — 200 — 923 B — 21 ms — h2https://www.skysports.com/js/modules-es6/ui-token-refresh-d7a91688ca8369a4c1c4.jswww.skysports.com/js/modules-es6/ui... https://www.skysports.com/js/modules-es6/ui-token-refresh-d7a91688ca8369a4c1c4.js — 200 — 800 B — 22 ms — h2
0 ms 500 ms 1.0 s 1.5 s FCP 732 ms LCP 1.8 shttps://skysports.com// https://skysports.com/ — 301 — 248 B — 83 ms — http/1.1https://www.skysports.com/www.skysports.com/ https://www.skysports.com/ — 200 — 43.5 KiB — 154 ms — h2https://www.skysports.com/assets/fonts/sky-regular.woffwww.skysports.com/assets/fonts/sky-... https://www.skysports.com/assets/fonts/sky-regular.woff — 200 — 28.1 KiB — 15 ms — h2https://www.skysports.com/assets/fonts/sky-display-medium.woffwww.skysports.com/assets/fonts/sky-... https://www.skysports.com/assets/fonts/sky-display-medium.woff — 200 — 21.0 KiB — 17 ms — h2https://www.skysports.com/assets/fonts/sky-medium.woffwww.skysports.com/assets/fonts/sky-... https://www.skysports.com/assets/fonts/sky-medium.woff — 200 — 27.6 KiB — 18 ms — h2https://www.skysports.com/css/min/site-main-sass-5bcd50fca8c173cf8603b140669bf171.csswww.skysports.com/css/min/site-main... https://www.skysports.com/css/min/site-main-sass-5bcd50fca8c173cf8603b140669bf171.css — 200 — 89.4 KiB 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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
100% of JavaScript execution is third-party
First-party Third-party 671ms · 194KB · £10/mo
www.skysports.com
Other
Costly
Execution 224ms
Transfer 149 KB
Unused 20%
Monthly Cost £3/mo
Unattributable
Other
Optional
Execution 160ms
Transfer 0 KB
Monthly Cost £2/mo
www.skysports.com
Other
Optional
Execution 146ms
Transfer 43 KB
Monthly Cost £2/mo
www.skysports.com
Other
Optional
Execution 141ms
Transfer 2 KB
Monthly Cost £2/mo

These scripts may cost more than they're worth

  • www.skysports.com adds 224ms and costs ~£3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.skysports.com takes 224ms 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

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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