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https://mobileslotsite.co.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
1
REVIEW
3
PASS
9
INFO
2

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

Mobile Desktop
98
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
78
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

535 ms

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

1.04 s

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

0 ms

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

0.001

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

914 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.

1.04 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
9 PASS 3 REVIEW 1 FIX
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
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/static/img/general/co... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/static/img/general/co... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.dmca.com/Badges/dmca_protected_sml_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/static/img/general/co... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/static/img/general/co... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://mobileslotsite.co.uk/wp-content/webp-expre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
33 images 489 KB
0 oversized -0 KB
6 legacy format
26 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

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

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 Bundles
9 scripts, 121 KB unused
REVIEW
9 scripts, 121 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-32JJ...: 63 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://mobileslotsite.co.uk/static/js/all.js: 58 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 121 KB
121 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-32JJXREKDD146 KB63 KB (43%)✓3rd
https://mobileslotsite.co.uk/static/js/all.js83 KB58 KB (70%)✓1st
https://mobileslotsite.co.uk/static/js/custom.js5 KB—✓1st
https://mobileslotsite.co.uk/static/js/user.js2 KB—✓1st
https://images.dmca.com/Badges/DMCABadgeHelper.min.js1 KB—✓3rd
https://mobileslotsite.co.uk/wp-content/plugins/universal-banner-popup/resources/js/ajax.js?ver=1.01 KB—✓1st
https://mobileslotsite.co.uk/wp-content/plugins/webp-express/js/lazysizes.min.js4 KB—✓1st
https://mobileslotsite.co.uk/wp-content/plugins/wp-tt-second-offer-links/script.js?ver=1.2.41 KB—✓1st
https://mobileslotsite.co.uk/wp-content/plugins/wp-tt-rating-stars/static/js/rating.js?ver=5.4.22 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

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

Green Hosting

No green hosting detected

A
Page Weight Budget
899 KB transferred, 53 requests
PASS
899 KB transferred, 53 requests
Info::
Page weighs 1.8 MB (899 KB transferred)
Info::
53 HTTP requests
Info::
Estimated 0.18 g CO2 per page load
899 KB / 2.4 MB budget
899 KB transferred
53 requests
0.18 g CO2 per page load
Images 489.3 KiB 54%
JavaScript 243.6 KiB 27%
Fonts 106.9 KiB 12%
CSS 32.6 KiB 4%
HTML 22.2 KiB 2%
Other 2.3 KiB 0%
Other 1.4 KiB 0%
Other 552 B 0%
0 2.4 MB 4.9 MB
Under budget
A
Third-Party Impact
29% third-party, 0 ms blocking
PASS
29% third-party, 0 ms blocking
Info::
Third-party code accounts for 29% of page weight (256.7 KiB of 898.8 KiB)
Info::
Third-party blocking time is low (0 ms)
71%
29%
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+
JS Execution Cost
415ms total JS execution
PASS
415ms total JS execution
Info::
https://mobileslotsite.co.uk/: 178ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-32JJ...: 84ms CPU time
Info::
https://mobileslotsite.co.uk/static/js/all.js: 79ms CPU time
Info::
Unattributable: 73ms CPU time
Info::
Third-party scripts: 158ms (38% of total)

Main Thread Breakdown

Style & Layout 28% Script Evaluation 27% Other 23% Script Parsing & Compilation 9% Rendering 6% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://mobileslotsite.co.uk/178ms1ms1ms1st
https://www.googletagmanager.com/gtag/js?id=G-32JJXREKDD84ms53ms31ms3rd
https://mobileslotsite.co.uk/static/js/all.js79ms49ms6ms1st
Unattributable73ms2ms0ms3rd
A+
Font Loading
5 fonts (107 KB)
PASS
5 fonts (107 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

107 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 535 ms LCP 1.0 shttps://fonts.gstatic.com/s/lato/v14/S6u9w4BMUTPHh6UVSwiPGQ.woff2S6u9w4BMUTPHh6UVSwiPGQ.... https://fonts.gstatic.com/s/lato/v14/S6u9w4BMUTPHh6UVSwiPGQ.woff2 — 22.3 KiB — 65 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v14/S6u9w4BMUTPHh50XSwiPGQ.woff2S6u9w4BMUTPHh50XSwiPGQ.... https://fonts.gstatic.com/s/lato/v14/S6u9w4BMUTPHh50XSwiPGQ.woff2 — 21.9 KiB — 69 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v14/S6uyw4BMUTPHjx4wXg.woff2S6uyw4BMUTPHjx4wXg.woff2 https://fonts.gstatic.com/s/lato/v14/S6uyw4BMUTPHjx4wXg.woff2 — 22.8 KiB — 67 ms — font-display: swaphttps://fonts.gstatic.com/s/arsenal/v3/wXKrE3kQtZQ4pF3D51jcAA.woff2wXKrE3kQtZQ4pF3D51jcAA.... https://fonts.gstatic.com/s/arsenal/v3/wXKrE3kQtZQ4pF3D51jcAA.woff2 — 17.2 KiB — 64 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v14/S6u9w4BMUTPHh7USSwiPGQ.woff2S6u9w4BMUTPHh7USSwiPGQ.... https://fonts.gstatic.com/s/lato/v14/S6u9w4BMUTPHh7USSwiPGQ.woff2 — 22.7 KiB — 68 ms — font-display: swap
S6u9w4BMUTPHh6UVSwiPGQ.... woff2 swap
Size 22 KB
Load time 65 ms
Start 937 ms
Risk FOUT — text flashes from fallback to web font
S6u9w4BMUTPHh50XSwiPGQ.... woff2 swap
Size 22 KB
Load time 69 ms
Start 937 ms
Risk FOUT — text flashes from fallback to web font
S6uyw4BMUTPHjx4wXg.woff2 woff2 swap
Size 23 KB
Load time 67 ms
Start 938 ms
Risk FOUT — text flashes from fallback to web font
wXKrE3kQtZQ4pF3D51jcAA.... woff2 swap
Size 17 KB
Load time 64 ms
Start 938 ms
Risk FOUT — text flashes from fallback to web font
S6u9w4BMUTPHh7USSwiPGQ.... woff2 swap
Size 23 KB
Load time 68 ms
Start 938 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Page Weight Inventory
53 resources · 899 KB · 121 KB savings available
PASS
53 resources · 899 KB · 121 KB savings available
Info::
Within 1MB page-weight target
Got: 899 KB
Info::
~121 KB of savings available
Info::
14 third-party resources (29% of weight)
53 resources · 898.8 KiB · 14 third-party Within 1MB page-weight target
Image 55% · 491.6 KiB
JavaScript 27% · 243.6 KiB
Font 12% · 106.9 KiB
CSS 4% · 32.6 KiB
Document 2% · 22.2 KiB
Other 0% · 1.9 KiB

~121.3 KiB of savings available

Remove unused JavaScript: 121.3 KiB
Network Waterfall
53 requests over 2348ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 535 ms LCP 1.0 shttps://mobileslotsite.co.uk// https://mobileslotsite.co.uk/ — 200 — 22.2 KiB — 819 ms — h3https://www.googletagmanager.com/gtag/js?id=G-32JJXREKDDwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-32JJXREKDD — 200 — 146.0 KiB — 145 ms — h2https://mobileslotsite.co.uk/static/css/main.min.css/static/css/main.min.css https://mobileslotsite.co.uk/static/css/main.min.css — 200 — 30.8 KiB — 59 ms — h3https://mobileslotsite.co.uk/static/js/all.js/static/js/all.js https://mobileslotsite.co.uk/static/js/all.js — 200 — 83.0 KiB — 80 ms — h3https://mobileslotsite.co.uk/static/js/custom.js/static/js/custom.js https://mobileslotsite.co.uk/static/js/custom.js — 200 — 4.7 KiB — 41 ms — h3https://mobileslotsite.co.uk/static/js/user.js/static/js/user.js https://mobileslotsite.co.uk/static/js/user.js — 200 — 1.9 KiB — 37 ms — h3https://mobileslotsite.co.uk/wp-content/plugins/universal-banner-popup/resources/css/main.min.css?ver=1.0/wp-content/plugins/universal-banne... https://mobileslotsite.co.uk/wp-content/plugins/universal-banner-popup/resources/css/main.min.css?ver=1.0 — 200 — 1.8 KiB — 32 ms — h3https://mobileslotsite.co.uk/wp-content/webp-express/webp-images/uploads/2021/03/logo_mobileslotsite.png.webp/wp-content/webp-express/webp-image... https://mobileslotsite.co.uk/wp-content/webp-express/webp-images/uploads/2021/03/logo_mobileslotsite.png.webp — 200 — 3.1 KiB — 39 ms — h3https://mobileslotsite.co.uk/wp-content/webp-express/webp-images/uploads/2020/08/banner-slide-1.jpg.webp/wp-content/webp-express/webp-image... https://mobileslotsite.co.uk/wp-content/webp-express/webp-images/uploads/2020/08/banner-slide-1.jpg.webp — 200 — 57.2 KiB — 78 ms — h3https://mobileslotsite.co.uk/static/img/general/cork-360-260.png/static/img/general/cork-360-260.pn... https://mobileslotsite.co.uk/static/img/general/cork-360-260.png — 200 — 2.1 KiB — 25 ms — h3https://images.dmca.com/Badges/DMCABadgeHelper.min.jsimages.dmca.com/Badges/DMCABadgeHel... https://images.dmca.com/Badges/DMCABadgeHelper.min.js — 200 — 803 B — 15 ms — h2https://mobileslotsite.co.uk/wp-content/plugins/universal-banner-popup/resources/js/ajax.js?ver=1.0/wp-content/plugins/universal-banne... https://mobileslotsite.co.uk/wp-content/plugins/universal-banner-popup/resources/js/ajax.js?ver=1.0 — 200 — 712 B — 32 ms — h3https://mobileslotsite.co.uk/wp-content/plugins/webp-express/js/lazysizes.min.js/wp-content/plugins/webp-express/js... https://mobileslotsite.co.uk/wp-content/plugins/webp-express/js/lazysizes.min.js — 200 — 4.0 KiB — 33 ms — h3https://mobileslotsite.co.uk/wp-content/plugins/wp-tt-second-offer-links/script.js?ver=1.2.4/wp-content/plugins/wp-tt-second-of... https://mobileslotsite.co.uk/wp-content/plugins/wp-tt-second-offer-links/script.js?ver=1.2.4 — 200 — 723 B — 33 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h3https://mobileslotsite.co.uk/wp-content/webp-express/webp-images/uploads/content-manager/slot/BsQ5lmPJPDLBB_Ub.jpg.webp/wp-content/webp-express/webp-image... https://mobileslotsite.co.uk/wp-content/webp-express/webp-images/uploads/content-manager/slot/BsQ5lmPJPDLBB_Ub.jpg.webp — 200 — 24.5 KiB — 35 ms — h3https://mobileslotsite.co.uk/wp-content/webp-express/webp-images/uploads/content-manager/slot/qw1A14eBVMrrFGow.jpg.webp/wp-content/webp-express/webp-image... https://mobileslotsite.co.uk/wp-content/webp-express/webp-images/uploads/content-manager/slot/qw1A14eBVMrrFGow.jpg.webp — 200 — 20.4 KiB — 34 ms — h3https://mobileslotsite.co.uk/wp-content/webp-express/webp-images/uploads/content-manager/slot/wJ10i0YCUUShRLTA.jpg.webp/wp-content/webp-express/webp-image... https://mobileslotsite.co.uk/wp-content/webp-express/webp-images/uploads/content-manager/slot/wJ10i0YCUUShRLTA.jpg.webp — 200 — 20.9 KiB — 25 ms — h3
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 158ms · 146KB · £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 84ms
Transfer 146 KB
Unused 43%
Monthly Cost £1/mo
Unattributable
Other
Optional
Execution 73ms
Transfer 0 KB
Monthly Cost £1/mo

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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