Performance

· 25 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.

2.32 s

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

5.68 s

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

61 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.

5.12 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.

5.89 s

Page Load Progression

579 ms

1.2 s

1.7 s

2.3 s

2.9 s

3.5 s

4.1 s

4.6 s

Checks

18 PASS 4 REVIEW 1 FIX

JS Execution Cost

Action

2497ms total JS execution

FIX

2497ms total JS execution

https://wan3video.art/: 1278ms CPU time

https://wan3video.art/assets/framework-DJH1pfSr.js: 843ms CPU time

Unattributable: 376ms CPU time

Main Thread Breakdown

Other 36% Script Evaluation 24% Style & Layout 22% Rendering 15%

Script	Total	Scripting	Parse/Compile	Party
https://wan3video.art/	1278ms	24ms	24ms	1st
https://wan3video.art/assets/framework-DJH1pfSr.js	843ms	547ms	0ms	1st
Unattributable	376ms	31ms	0ms	1st

Third-Party Impact

50% third-party, 0 ms blocking

REVIEW

50% third-party, 0 ms blocking

Third-party code accounts for 50% of page weight (339.3 KiB of 683.3 KiB)

Third-party blocking time is low (0 ms)

50%

First-party Third-party

Image Optimization

8 images, 0 KB saveable

REVIEW

8 images, 0 KB saveable

All images are well-optimized

8 images 360 KB

0 oversized -0 KB

6 legacy format

0 missing dimensions CLS risk

Server-Timing Observability

No Server-Timing header found

REVIEW

No Server-Timing header found

Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.

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

683 KB transferred, 89 requests

PASS

683 KB transferred, 89 requests

Page weighs 1.5 MB (683 KB transferred)

89 HTTP requests

Estimated 0.14 g CO2 per page load

683 KB transferred

89 requests

0.14 g CO2 per page load

Images 360.0 KiB 53%

JavaScript 212.3 KiB 31%

HTML 41.6 KiB 6%

CSS 33.3 KiB 5%

Other 31.3 KiB 5%

Other 3.9 KiB 1%

Other 935 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

No web fonts (system fonts)

PASS

No web fonts (system fonts)

No web fonts loaded — system fonts are fastest

No web fonts loaded — system fonts are optimal.

A+

JS Bundles

68 scripts, 0 KB unused

PASS

68 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://wan3video.art/assets/global-error-CVl8f3Cz.js	1 KB	—	✓	1st
https://wan3video.art/assets/framework-DJH1pfSr.js	60 KB	—	✓	1st
https://wan3video.art/assets/rolldown-runtime-QTnfLwEv.js	1 KB	—	✓	1st
https://wan3video.art/assets/url-utils-BQKFb685.js	1 KB	—	✓	1st
https://wan3video.art/assets/error-D3bmAt5F.js	1 KB	—	✓	1st
https://wan3video.art/assets/navigation-Byp9-lQc.js	1 KB	—	✓	1st
https://wan3video.art/assets/react-DlbkFqaW.js	13 KB	—	✓	1st
https://wan3video.art/assets/BaseLink-DUD_n6-y.js	6 KB	—	✓	1st
https://wan3video.art/assets/locale-B0WQmzKF.js	3 KB	—	✓	1st
https://wan3video.art/assets/react-client-CAjdHkmk.js	0 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

Resource Hints

3 hints, 0 missing preconnects

PASS

3 hints, 0 missing preconnects

1 dns-prefetch redundant with preconnect on same origin

preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://www.googletagmanager.com. Remove the redundant dns-prefetch entries.

1 URL(s) appear in multiple hints

The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://www.googletagmanager.com (dns-prefetch+preconnect).

Page uses 3 resource hint(s)

Current Resource Hints

preconnect

preload

dns-prefetch

prefetch

—

3 resource hints configured

preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://www.googletagmanager.com. Remove the redundant dns-prefetch entries.

Why this matters

Performance issues directly impact user engagement and conversion rates.

The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://www.googletagmanager.com (dns-prefetch+preconnect).

Why this matters

Performance issues directly impact user engagement and conversion rates.

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+

Compression Algorithm

Main response uses brotli

PASS

Main 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 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.

Page Weight Inventory

89 resources · 683 KB · 0 KB savings available

PASS

89 resources · 683 KB · 0 KB savings available

Within 1MB page-weight target

Got: 683 KB

13 third-party resources (50% of weight)

89 resources · 683.3 KiB · 13 third-party Within 1MB page-weight target

Image 57% · 391.3 KiB

JavaScript 31% · 212.3 KiB

Document 6% · 41.6 KiB

CSS 5% · 33.3 KiB

Other 1% · 4.8 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

89 resources			683.3 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+

JavaScript Blocking

No render-blocking JS or document.write usage detected

PASS

No render-blocking JS or document.write usage detected

No JavaScript blocking issues detected

A+

CSS Performance Depth

No CSS performance depth issues detected

PASS

No CSS performance depth issues 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

89 requests over 3581ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

28 images, 28 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

28 KB

Oversized

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