Performance

· 23 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

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.

643 ms

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

722 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.

1.89 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.

722 ms

Page Load Progression

589 ms

1.2 s

1.8 s

2.4 s

2.9 s

3.5 s

4.1 s

4.7 s

Checks

14 PASS 5 REVIEW

Page Weight Budget

1.2 MB transferred, 92 requests

REVIEW

1.2 MB transferred, 92 requests

Page weighs 2.3 MB (1.2 MB transferred)

92 HTTP requests

Estimated 0.26 g CO2 per page load

1.2 MB transferred

92 requests

0.26 g CO2 per page load

Other 708.6 KiB 56%

JavaScript 387.2 KiB 31%

HTML 41.3 KiB 3%

Other 33.4 KiB 3%

CSS 32.7 KiB 3%

Images 27.8 KiB 2%

Fonts 20.6 KiB 2%

Other 5.0 KiB 0%

Other 1.3 KiB 0%

Other 955 B 0%

Other 920 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Under budget

JS Execution Cost

757ms total JS execution

REVIEW

757ms total JS execution

https://kling4ai.app/assets/framework-DJH1pfSr.js: 264ms CPU time

https://kling4ai.app/: 250ms CPU time

Unattributable: 190ms CPU time

https://static.cloudflareinsights.com/beacon.min.j...: 52ms CPU time

Third-party scripts: 52ms (7% of total)

Main Thread Breakdown

Script Evaluation 38% Other 37% Style & Layout 16% Script Parsing & Compilation 3% Rendering 3%

Script	Total	Scripting	Parse/Compile	Party
https://kling4ai.app/assets/framework-DJH1pfSr.js	264ms	211ms	1ms	1st
https://kling4ai.app/	250ms	15ms	11ms	1st
Unattributable	190ms	17ms	0ms	1st
https://static.cloudflareinsights.com/beacon.min.js/v31edd6df95cf4e85bb4c19e7a9bdbcba1788362987495	52ms	44ms	0ms	3rd

JS Bundles

65 scripts, 74 KB unused

REVIEW

65 scripts, 74 KB unused

https://accounts.google.com/gsi/client: 74 KB unused (75%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 74 KB

74 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://accounts.google.com/gsi/client	99 KB	74 KB (75%)	✓	3rd
https://kling4ai.app/assets/global-error-CVl8f3Cz.js	1 KB	—	✓	1st
https://kling4ai.app/assets/framework-DJH1pfSr.js	60 KB	—	✓	1st
https://kling4ai.app/assets/rolldown-runtime-QTnfLwEv.js	1 KB	—	✓	1st
https://kling4ai.app/assets/url-utils-BQKFb685.js	1 KB	—	✓	1st
https://kling4ai.app/assets/error-Cw7PdD78.js	1 KB	—	✓	1st
https://kling4ai.app/assets/navigation-jMN0Yddo.js	1 KB	—	✓	1st
https://kling4ai.app/assets/react-DlbkFqaW.js	13 KB	—	✓	1st
https://kling4ai.app/assets/BaseLink-H_zw-cXa.js	6 KB	—	✓	1st
https://kling4ai.app/assets/locale-Cc3baYjD.js	2 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

Page Weight Inventory

92 resources · 1.2 MB · 74 KB savings available

REVIEW

92 resources · 1.2 MB · 74 KB savings available

Page weight 1.2 MB exceeds 1 MB target by 236 KB

Got: 1.2 MB Expected: ≤ 1 MB

~74 KB of savings available

10 third-party resources (9% of weight)

1 resources over 200KB

92 resources · 1.2 MiB · 10 third-party 235.8 KiB over 1MB target

Media 56% · 708.6 KiB

JavaScript 31% · 387.2 KiB

Image 5% · 61.2 KiB

Document 3% · 41.3 KiB

CSS 3% · 32.7 KiB

Font 2% · 20.6 KiB

Other 1% · 8.2 KiB

~74.2 KiB of savings available

Remove unused JavaScript: 74.2 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

92 resources			1.2 MiB

HTTP Caching

public, max-age=0, s-maxage=60, must-revalidate

REVIEW

public, max-age=0, s-maxage=60, must-revalidate

Cache-Control header is set

Got: public, max-age=0, s-maxage=60, must-revalidate

CDN TTL: 1 minute (s-maxage=60)

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

public, max-age=0, s-maxage=60, must-revalidate

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	0	Cache for 0 seconds
s-maxage	60	CDN caches for 1 minute
must-revalidate	—	Must recheck with server after expiry

A+

Third-Party Impact

9% third-party, 0 ms blocking

PASS

9% third-party, 0 ms blocking

Third-party code accounts for 9% of page weight (116.2 KiB of 1.2 MiB)

Third-party blocking time is low (0 ms)

91%

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+

Image Optimization

3 images, 0 KB saveable

PASS

3 images, 0 KB saveable

All images are well-optimized

3 images 4 KB

0 oversized -0 KB

1 legacy format

0 missing dimensions CLS risk

A+

Font Loading

2 fonts (21 KB)

PASS

2 fonts (21 KB)

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

Web fonts

21 KB total

Render-blocking

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

outfit-19c86109.woff2 woff2 swap

Size 7 KB

Load time 49 ms

Start 452 ms

Risk FOUT — text flashes from fallback to web font

outfit-be21ba2a.woff2 woff2 swap

Size 14 KB

Load time 53 ms

Start 454 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

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+

HTTP/3 (QUIC)

HTTP/3 advertised via Alt-Svc

PASS

HTTP/3 advertised via Alt-Svc

HTTP/3 (QUIC) is supported

First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.

A+

Document Compression

Document response uses brotli

PASS

Document response uses brotli

Main HTML response uses brotli (Content-Encoding: br)

Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.

A+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

LCP image preload audit not available for this scan

A+

Main HTML Cache-Control

Main HTML max-age=0 (≤ 5min) is appropriate

PASS

Main HTML max-age=0 (≤ 5min) is appropriate

Got: public, max-age=0, s-maxage=60, must-revalidate

A+

Server-Timing Observability

3 Server-Timing entries advertised

PASS

3 Server-Timing entries advertised

Server-Timing header advertises 3 timing entries

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`Vary` header declared: RSC, Accept, Next-Router-State-Tree, Next-Router-Prefetch, Next-Router-Segment-P...

The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).

No `ETag` or `Last-Modified` -- conditional GET not supported

Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.

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

Asset Compression

No text asset hosts to measure

INFO

No text asset hosts to measure

No third-party or subdomain host served enough text assets to measure

Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.

Network Waterfall

92 requests over 2452ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

7% of JavaScript execution is third-party

First-party Third-party 52ms · 10KB · €0/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
static.cloudflareinsights.com static.cloudflareinsights.com	Other	52ms	10 KB	—	€0/mo	Optional

static.cloudflareinsights.com

Other

Optional

Execution 52ms

Transfer 10 KB

Monthly Cost €0/mo

How third-party costs are calculated

Image Optimization

4 images, 28 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

28 KB

1 missing lazy loading

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.