https://wan3video.art
Performance
· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
90
GRADE
A
FIX
1
REVIEW
5
PASS
17
INFO
2
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
67
93
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.81 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.42 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
44 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.
5.46 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.
7.54 s
Page Load Progression
581 ms 1.2 s 1.7 s 2.3 s
2.9 s 3.5 s 4.1 s
4.6 sChecks
2517 PASS 5 REVIEW 1 FIX
DJS Execution CostAction2090ms total JS executionFIX
JS Execution Cost
Action2090ms total JS execution
2090ms total JS execution
Warning::
https://wan3video.art/: 931ms CPU time
Warning::
https://wan3video.art/assets/framework-DJH1pfSr.js: 723ms CPU time
Warning::
Unattributable: 436ms CPU time
Main Thread Breakdown
Style & Layout 34% Script Evaluation 30% Other 27% Rendering 4%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://wan3video.art/ | 931ms | 17ms | 23ms | 1st |
| https://wan3video.art/assets/framework-DJH1pfSr.js | 723ms | 583ms | 0ms | 1st |
| Unattributable | 436ms | 43ms | 0ms | 1st |
BThird-Party Impact47% third-party, 0 ms blockingREVIEW
Third-Party Impact
47% third-party, 0 ms blocking
47% third-party, 0 ms blocking
Info::
Third-party code accounts for 47% of page weight (428.4 KiB of 916.3 KiB)
Info::
Third-party blocking time is low (0 ms)
53%
47%
First-party Third-party
BImage Optimization8 images, 0 KB saveableREVIEW
Image Optimization
8 images, 0 KB saveable
8 images, 0 KB saveable
Info::
All images are well-optimized
8 images 425 KB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
BMain HTML Cache-ControlCache-Control present but without max-ageREVIEW
Main HTML Cache-Control
Cache-Control present but without max-age
Cache-Control present but without max-age
Info::
Main HTML Cache-Control has no max-age: public, s-maxage=60, stale-while-revalidate=300
Got: public, s-maxage=60, stale-while-revalidate=300
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
No Server-Timing header found
Info::
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.
BHTTP Cachingpublic, s-maxage=60, stale-while-revalidate=300REVIEW
HTTP Caching
public, s-maxage=60, stale-while-revalidate=300
public, s-maxage=60, stale-while-revalidate=300
Info::
Cache-Control header is set
Got: public, s-maxage=60, stale-while-revalidate=300
Info::
CDN TTL: 1 minute (s-maxage=60)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
public, s-maxage=60, stale-while-revalidate=300
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| s-maxage | 60 | CDN caches for 1 minute |
| stale-while-revalidate | 300 | Serve stale for 5 minutes while fetching fresh |
APage Weight Budget916 KB transferred, 89 requestsPASS
Page Weight Budget
916 KB transferred, 89 requests
916 KB transferred, 89 requests
Info::
Page weighs 1.8 MB (916 KB transferred)
Info::
89 HTTP requests
Info::
Estimated 0.19 g CO2 per page load
916 KB transferred
89 requests
0.19 g CO2 per page load
Images 424.6 KiB 46%
JavaScript 259.9 KiB 28%
Fonts 107.3 KiB 12%
HTML 49.3 KiB 5%
Other 37.5 KiB 4%
CSS 32.8 KiB 4%
Other 3.9 KiB 0%
Other 929 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Font Loading5 fonts (107 KB)PASS
Font Loading
5 fonts (107 KB)
5 fonts (107 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
5
107 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
syne-bd7099ad.woff2 woff2 swap
Size 11 KB
Load time 152 ms
Start 239 ms
Risk FOUT — text flashes from fallback to web font
syne-f2eba987.woff2 woff2 swap
Size 15 KB
Load time 152 ms
Start 240 ms
Risk FOUT — text flashes from fallback to web font
syne-c37e2fa5.woff2 woff2 swap
Size 34 KB
Load time 202 ms
Start 240 ms
Risk FOUT — text flashes from fallback to web font
outfit-f37fa50e.woff2 woff2 swap
Size 15 KB
Load time 275 ms
Start 240 ms
Risk FOUT — text flashes from fallback to web font
outfit-c8e7a734.woff2 woff2 swap
Size 32 KB
Load time 275 ms
Start 241 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 Bundles63 scripts, 0 KB unusedPASS
JS Bundles
63 scripts, 0 KB unused
63 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-CPFCe8aP.js | 1 KB | — | ✓ | 1st |
| https://wan3video.art/assets/navigation-B4BfoQf8.js | 1 KB | — | ✓ | 1st |
| https://wan3video.art/assets/react-DlbkFqaW.js | 13 KB | — | ✓ | 1st |
| https://wan3video.art/assets/BaseLink-C8FbMEvF.js | 6 KB | — | ✓ | 1st |
| https://wan3video.art/assets/locale-Bhv3KJcg.js | 3 KB | — | ✓ | 1st |
| https://wan3video.art/assets/react-client-CAjdHkmk.js | 0 KB | — | ✓ | 1st |
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
AResource Hints6 hints, 0 missing preconnectsPASS
Resource Hints
6 hints, 0 missing preconnects
6 hints, 0 missing preconnects
Warning::
5 font preload(s) missing `crossorigin` -- font will be downloaded twice
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: /assets/_vinext_fonts/syne-12293ae4f566/syne-bd7099ad.woff2, /assets/_vinext_fonts/syne-12293ae4f566/syne-f2eba987.woff2, /assets/_vinext_fonts/syne-12293ae4f566/syne-c37e2fa5.woff2 (+2 more). Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Info::
Page uses 6 resource hint(s)
Current Resource Hints
preconnect—
preload 6
dns-prefetch—
prefetch—
6 resource hints configured
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: /assets/_vinext_fonts/syne-12293ae4f566/syne-bd7099ad.woff2, /assets/_vinext_fonts/syne-12293ae4f566/syne-f2eba987.woff2, /assets/_vinext_fonts/syne-12293ae4f566/syne-c37e2fa5.woff2 (+2 more). Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Why this matters
Performance issues directly impact user engagement and conversion rates.
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
HTTP/3 advertised via Alt-Svc
Info::
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 AlgorithmMain response uses brotliPASS
Compression Algorithm
Main response uses brotli
Main response uses brotli
Info::
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 PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
2 server-response signal(s) detected
Info::
`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).
Info::
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.
APage Weight Inventory89 resources · 916 KB · 0 KB savings availablePASS
Page Weight Inventory
89 resources · 916 KB · 0 KB savings available
89 resources · 916 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 916 KB
Warning::
14 third-party resources (47% of weight)
89 resources · 916.3 KiB · 14 third-party Within 1MB page-weight target
Image 50% · 462.1 KiB
JavaScript 28% · 259.9 KiB
Font 12% · 107.3 KiB
Document 5% · 49.3 KiB
CSS 4% · 32.8 KiB
Other 1% · 4.8 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 89 resources | 916.3 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
A+JavaScript BlockingNo render-blocking JS or document.write usage detectedPASS
JavaScript Blocking
No render-blocking JS or document.write usage detected
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
ACSS Performance Depth1 CSS depth issue(s) detectedPASS
CSS Performance Depth
1 CSS depth issue(s) detected
1 CSS depth issue(s) detected
Warning::
2 `@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 HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall89 requests over 2147msINFO
Network Waterfall
89 requests over 2147ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization22 images, 4 KB total, 0 KB wastedINFO
Image Optimization
22 images, 4 KB total, 0 KB wasted
Image Optimization Audit
Total Images
22
Total Size
4 KB
Oversized
2
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.