Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

100

Best Practices

100

SEO

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

2.22 s

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

0 ms

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.

0.000

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

3.63 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.

0 ms

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

12 PASS 2 REVIEW 1 FIX

HTTP Caching

Action

No cache headers

FIX

No cache headers

No Cache-Control header found

Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

Last-Modified header present

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

Image Optimization

22 images, 0 KB saveable

REVIEW

22 images, 0 KB saveable

https://i24slot.org/wp-content/webp-express/webp-i... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://i24slot.org/static/img/general/cork.png is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

22 images 229 KB

0 oversized -0 KB

2 legacy format

2 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

JS Execution Cost

958ms total JS execution

REVIEW

958ms total JS execution

https://i24slot.org/: 425ms CPU time

Unattributable: 302ms CPU time

https://i24slot.org/static/js/jquery-3.1.1.min.js?...: 106ms CPU time

https://i24slot.org/wp-content/plugins/webp-expres...: 74ms CPU time

https://static.cloudflareinsights.com/beacon.min.j...: 50ms CPU time

Third-party scripts: 353ms (37% of total)

Main Thread Breakdown

Other 35% Style & Layout 33% Script Evaluation 19% Parse HTML & CSS 6% Rendering 4% Script Parsing & Compilation 3%

Script	Total	Scripting	Parse/Compile	Party
https://i24slot.org/	425ms	7ms	2ms	1st
Unattributable	302ms	7ms	0ms	3rd
https://i24slot.org/static/js/jquery-3.1.1.min.js?ver=1.0.0	106ms	82ms	11ms	1st
https://i24slot.org/wp-content/plugins/webp-express/js/lazysizes.min.js	74ms	26ms	1ms	1st
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516	50ms	37ms	6ms	3rd

A+

Page Weight Budget

355 KB transferred, 39 requests

PASS

355 KB transferred, 39 requests

Page weighs 543 KB (355 KB transferred)

39 HTTP requests

Estimated 0.07 g CO2 per page load

355 KB transferred

39 requests

0.07 g CO2 per page load

Images 229.0 KiB 65%

JavaScript 64.6 KiB 18%

Fonts 30.9 KiB 9%

HTML 14.8 KiB 4%

CSS 12.0 KiB 3%

Other 1.8 KiB 1%

Other 1.5 KiB 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

12% third-party, 0 ms blocking

PASS

12% third-party, 0 ms blocking

Third-party code accounts for 12% of page weight (41.7 KiB of 354.7 KiB)

Third-party blocking time is low (0 ms)

88%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

2 fonts (31 KB)

PASS

2 fonts (31 KB)

2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

31 KB total

Render-blocking

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

KFOlCnqEu92Fr1MmWUlfBBc... woff2 swap

Size 16 KB

Load time 35 ms

Start 1.4 s

Risk FOUT — text flashes from fallback to web font

KFOmCnqEu92Fr1Mu4mxK.woff2 woff2 swap

Size 15 KB

Load time 31 ms

Start 1.4 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+

JS Bundles

8 scripts, 0 KB unused

PASS

8 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://i24slot.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js	1 KB	—	✓	1st
https://i24slot.org/static/js/jquery-3.1.1.min.js?ver=1.0.0	35 KB	—	✓	1st
https://i24slot.org/wp-content/plugins/universal-banner-popup/resources/js/ajax.js?ver=1.0	1 KB	—	✓	1st
https://i24slot.org/wp-content/plugins/webp-express/js/lazysizes.min.js	4 KB	—	✓	1st
https://i24slot.org/wp-content/plugins/wp-tt-second-offer-links/script.js?ver=1.2.4	1 KB	—	✓	1st
https://i24slot.org/static/js/bs-plugins.js?ver=1.0.0	12 KB	—	✓	1st
https://i24slot.org/static/js/custom.js?ver=1.0.0	1 KB	—	✓	1st
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516	11 KB	—	✓	3rd

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

1 hints, 0 missing preconnects

PASS

1 hints, 0 missing preconnects

Page uses 1 resource hint(s)

Current Resource Hints

preconnect

—

preload

—

dns-prefetch

prefetch

—

1 resource hints configured

A+

Page Weight Inventory

39 resources · 355 KB · 0 KB savings available

PASS

39 resources · 355 KB · 0 KB savings available

Within 1MB page-weight target

Got: 355 KB

3 third-party resources (12% of weight)

1 resources over 200KB

39 resources · 354.7 KiB · 3 third-party Within 1MB page-weight target

Image 65% · 230.5 KiB

JavaScript 18% · 64.6 KiB

Font 9% · 30.9 KiB

Document 4% · 14.8 KiB

CSS 3% · 12.0 KiB

Other 1% · 1.8 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

39 resources			354.7 KiB

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall

39 requests over 3402ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

37% of JavaScript execution is third-party

First-party Third-party 353ms · 11KB · €4/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	302ms	0 KB	—	€3/mo	Costly
static.cloudflareinsights.com static.cloudflareinsights.com	Other	50ms	11 KB	—	€1/mo	Optional

Unattributable

Other

Costly

Execution 302ms

Transfer 0 KB

Monthly Cost €3/mo

static.cloudflareinsights.com

Other

Optional

Execution 50ms

Transfer 11 KB

Monthly Cost €1/mo

These scripts may cost more than they're worth

Unattributable adds 302ms and costs ~€3/month

Unattributable takes 302ms 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.

Browse & Analyze

Learn

Performance

Page Load Progression

Font loading timeline

Optimization checklist

Green Hosting

These scripts may cost more than they're worth