Performance

· 15 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.

647 ms

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

647 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.

0.970

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

1.48 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.

647 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

11 PASS 1 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/static/img/general/cork.png is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

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.

22 images 426 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

A+

Page Weight Budget

551 KB transferred, 39 requests

PASS

551 KB transferred, 39 requests

Page weighs 739 KB (551 KB transferred)

39 HTTP requests

Estimated 0.11 g CO2 per page load

551 KB transferred

39 requests

0.11 g CO2 per page load

Images 425.7 KiB 77%

JavaScript 64.6 KiB 12%

Fonts 30.9 KiB 6%

HTML 14.8 KiB 3%

CSS 12.0 KiB 2%

Other 1.8 KiB 0%

Other 1.5 KiB 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

8% third-party, 0 ms blocking

PASS

8% third-party, 0 ms blocking

Third-party code accounts for 8% of page weight (41.7 KiB of 551.4 KiB)

Third-party blocking time is low (0 ms)

92%

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+

JS Execution Cost

229ms total JS execution

PASS

229ms total JS execution

https://i24slot.org/: 116ms CPU time

Unattributable: 113ms CPU time

Third-party scripts: 113ms (49% of total)

Main Thread Breakdown

Other 45% Style & Layout 29% Script Evaluation 15% Parse HTML & CSS 5% Rendering 3%

Script	Total	Scripting	Parse/Compile	Party
https://i24slot.org/	116ms	2ms	2ms	1st
Unattributable	113ms	2ms	0ms	3rd

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 52 ms

Start 1.2 s

Risk FOUT — text flashes from fallback to web font

KFOmCnqEu92Fr1Mu4mxK.woff2 woff2 swap

Size 15 KB

Load time 54 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+

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

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

Page Weight Inventory

39 resources · 551 KB · 0 KB savings available

PASS

39 resources · 551 KB · 0 KB savings available

Within 1MB page-weight target

Got: 551 KB

3 third-party resources (8% of weight)

1 resources over 200KB

39 resources · 551.4 KiB · 3 third-party Within 1MB page-weight target

Image 77% · 427.2 KiB

JavaScript 12% · 64.6 KiB

Font 6% · 30.9 KiB

Document 3% · 14.8 KiB

CSS 2% · 12.0 KiB

Other 0% · 1.8 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

39 resources			551.4 KiB

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 2681ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

49% of JavaScript execution is third-party

First-party Third-party 113ms · 0KB · €1/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	113ms	0 KB	—	€1/mo	Optional

Unattributable

Other

Optional

Execution 113ms

Transfer 0 KB

Monthly Cost €1/mo

49% 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

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.