Performance

· 27 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.

5.05 s

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

6.42 s

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

344 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.

5.74 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.

6.42 s

Page Load Progression

716 ms

1.4 s

2.1 s

2.9 s

3.6 s

4.3 s

5.0 s

5.7 s

Checks

21 PASS 1 REVIEW 1 FIX

JS Execution Cost

Action

3943ms total JS execution

FIX

3943ms total JS execution

https://kling5.art/: 1847ms CPU time

https://kling5.art/assets/framework-DJH1pfSr.js: 960ms CPU time

Unattributable: 758ms CPU time

https://static.cloudflareinsights.com/beacon.min.j...: 203ms CPU time

https://kling5.art/assets/video-studio-hero-BssgAd...: 108ms CPU time

Third-party scripts: 203ms (5% of total)

Main Thread Breakdown

Other 40% Script Evaluation 28% Style & Layout 20% Rendering 5% Script Parsing & Compilation 3% Parse HTML & CSS 3%

Script	Total	Scripting	Parse/Compile	Party
https://kling5.art/	1847ms	171ms	99ms	1st
https://kling5.art/assets/framework-DJH1pfSr.js	960ms	697ms	4ms	1st
Unattributable	758ms	57ms	0ms	1st
https://static.cloudflareinsights.com/beacon.min.js/v31edd6df95cf4e85bb4c19e7a9bdbcba1788362987495	203ms	170ms	0ms	3rd
https://kling5.art/assets/video-studio-hero-BssgAdDJ.js	108ms	79ms	0ms	1st
https://kling5.art/assets/index-DEIFmQaM.css	66ms	0ms	0ms	1st

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+

Page Weight Budget

386 KB transferred, 90 requests

PASS

386 KB transferred, 90 requests

Page weighs 1.3 MB (386 KB transferred)

90 HTTP requests

Estimated 0.08 g CO2 per page load

386 KB transferred

90 requests

0.08 g CO2 per page load

JavaScript 224.0 KiB 58%

HTML 47.7 KiB 12%

CSS 32.2 KiB 8%

Images 27.6 KiB 7%

Other 26.9 KiB 7%

Fonts 20.9 KiB 5%

Other 3.9 KiB 1%

Other 1.3 KiB 0%

Other 922 B 0%

Other 881 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

4% third-party, 0 ms blocking

PASS

4% third-party, 0 ms blocking

Third-party code accounts for 4% of page weight (16.3 KiB of 386.2 KiB)

Third-party blocking time is low (0 ms)

96%

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 26 KB

0 oversized -0 KB

0 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 76 ms

Start 192 ms

Risk FOUT — text flashes from fallback to web font

outfit-be21ba2a.woff2 woff2 swap

Size 14 KB

Load time 81 ms

Start 193 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+

JS Bundles

66 scripts, 0 KB unused

PASS

66 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://kling5.art/assets/global-error-CVl8f3Cz.js	1 KB	—	✓	1st
https://kling5.art/assets/framework-DJH1pfSr.js	60 KB	—	✓	1st
https://kling5.art/assets/rolldown-runtime-QTnfLwEv.js	1 KB	—	✓	1st
https://kling5.art/assets/url-utils-BQKFb685.js	1 KB	—	✓	1st
https://kling5.art/assets/error-CKqcQOr6.js	1 KB	—	✓	1st
https://kling5.art/assets/navigation-NAM0kUEw.js	2 KB	—	✓	1st
https://kling5.art/assets/react-DlbkFqaW.js	14 KB	—	✓	1st
https://kling5.art/assets/BaseLink-BtIEPdS4.js	6 KB	—	✓	1st
https://kling5.art/assets/locale-Ca8Mb35V.js	3 KB	—	✓	1st
https://kling5.art/assets/welcome-copy-DIyE0o41.js	2 KB	—	✓	1st

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

4 hints, 0 missing preconnects

PASS

4 hints, 0 missing preconnects

Page uses 4 resource hint(s)

Current Resource Hints

preconnect

—

preload

dns-prefetch

—

prefetch

—

4 resource hints configured

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+

Page Weight Inventory

90 resources · 386 KB · 0 KB savings available

PASS

90 resources · 386 KB · 0 KB savings available

Within 1MB page-weight target

Got: 386 KB

8 third-party resources (4% of weight)

90 resources · 386.2 KiB · 8 third-party Within 1MB page-weight target

JavaScript 58% · 224.0 KiB

Image 14% · 54.5 KiB

Document 12% · 47.7 KiB

CSS 8% · 32.2 KiB

Font 5% · 20.9 KiB

Other 2% · 6.9 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

90 resources			386.2 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

JavaScript Blocking

1 JS blocking issue(s) detected

PASS

1 JS blocking issue(s) detected

Total JS execution time is 3.9 s -- over the 3.5s budget

Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.

CSS Performance Depth

1 CSS depth issue(s) detected

PASS

1 CSS depth issue(s) detected

1 `@font-face` rule(s) without `font-display` -- causes FOIT

An `@font-face` rule without `font-display` causes Flash of Invisible Text (FOIT): the browser hides the styled text for up to 3 seconds while the custom font downloads, then either swaps to fallback (Chrome / Firefox) or stays invisible (older Safari). Add `font-display: swap` (shows fallback immediately, swaps in the custom font when ready) or `font-display: optional` (uses fallback if the font isn't ready in 100ms; never causes visible swap). Either eliminates FOIT outright.

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

90 requests over 3410ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

5% of JavaScript execution is third-party

First-party Third-party 203ms · 10KB · €1/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
static.cloudflareinsights.com static.cloudflareinsights.com	Other	203ms	10 KB	—	€1/mo	Costly

static.cloudflareinsights.com

Other

Costly

Execution 203ms

Transfer 10 KB

Monthly Cost €1/mo

These scripts may cost more than they're worth

static.cloudflareinsights.com adds 203ms and costs ~€1/month

static.cloudflareinsights.com takes 203ms 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

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.