https://veo4-video.art
Performance
· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
96
GRADE
A
FIX
0
REVIEW
5
PASS
14
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
87
96
96
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.51 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.69 s
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.
1.56 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.
1.69 s
Page Load Progression
384 ms
768 ms
1.2 s
1.5 s
1.9 s
2.3 s
2.7 s
3.1 sChecks
2214 PASS 5 REVIEW
BPage Weight Budget1.2 MB transferred, 86 requestsREVIEW
Page Weight Budget
1.2 MB transferred, 86 requests
1.2 MB transferred, 86 requests
Info::
Page weighs 2.2 MB (1.2 MB transferred)
Info::
86 HTTP requests
Info::
Estimated 0.25 g CO2 per page load
1.2 MB transferred
86 requests
0.25 g CO2 per page load
Other 708.6 KiB 57%
JavaScript 380.9 KiB 31%
HTML 48.6 KiB 4%
CSS 32.9 KiB 3%
Images 27.4 KiB 2%
Fonts 21.0 KiB 2%
Other 18.4 KiB 1%
Other 5.0 KiB 0%
Other 936 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
BJS Bundles65 scripts, 75 KB unusedREVIEW
JS Bundles
65 scripts, 75 KB unused
65 scripts, 75 KB unused
Warning::
https://accounts.google.com/gsi/client: 75 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 75 KB
75 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://accounts.google.com/gsi/client | 99 KB | 75 KB (76%) | ✓ | 3rd |
| https://veo4-video.art/assets/global-error-CVl8f3Cz.js | 1 KB | — | ✓ | 1st |
| https://veo4-video.art/assets/framework-DJH1pfSr.js | 60 KB | — | ✓ | 1st |
| https://veo4-video.art/assets/rolldown-runtime-QTnfLwEv.js | 1 KB | — | ✓ | 1st |
| https://veo4-video.art/assets/url-utils-BQKFb685.js | 1 KB | — | ✓ | 1st |
| https://veo4-video.art/assets/error-vu_n7QCq.js | 1 KB | — | ✓ | 1st |
| https://veo4-video.art/assets/navigation-DzNlvf1v.js | 2 KB | — | ✓ | 1st |
| https://veo4-video.art/assets/react-DlbkFqaW.js | 14 KB | — | ✓ | 1st |
| https://veo4-video.art/assets/BaseLink-D82kve3f.js | 6 KB | — | ✓ | 1st |
| https://veo4-video.art/assets/locale-C4W5Hkep.js | 3 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
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.
BPage Weight Inventory86 resources · 1.2 MB · 75 KB savings availableREVIEW
Page Weight Inventory
86 resources · 1.2 MB · 75 KB savings available
86 resources · 1.2 MB · 75 KB savings available
Warning::
Page weight 1.2 MB exceeds 1 MB target by 220 KB
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~75 KB of savings available
Info::
9 third-party resources (9% of weight)
Info::
1 resources over 200KB
86 resources · 1.2 MiB · 9 third-party 219.6 KiB over 1MB target
Media 57% · 708.6 KiB
JavaScript 31% · 380.9 KiB
Document 4% · 48.6 KiB
Image 4% · 45.8 KiB
CSS 3% · 32.9 KiB
Font 2% · 21.0 KiB
Other 0% · 5.9 KiB
~74.6 KiB of savings available
Remove unused JavaScript: 74.6 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 86 resources | 1.2 MiB | ||||||
BHTTP Cachingpublic, max-age=0, s-maxage=60, must-revalidateREVIEW
HTTP Caching
public, max-age=0, s-maxage=60, must-revalidate
public, max-age=0, s-maxage=60, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, s-maxage=60, must-revalidate
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, 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 Impact9% third-party, 0 ms blockingPASS
Third-Party Impact
9% third-party, 0 ms blocking
9% third-party, 0 ms blocking
Info::
Third-party code accounts for 9% of page weight (106.1 KiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
91%
First-party Third-party
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+Image Optimization3 images, 0 KB saveablePASS
Image Optimization
3 images, 0 KB saveable
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 27 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+JS Execution Cost439ms total JS executionPASS
JS Execution Cost
439ms total JS execution
439ms total JS execution
Info::
https://veo4-video.art/: 179ms CPU time
Info::
https://veo4-video.art/assets/framework-DJH1pfSr.j...: 159ms CPU time
Info::
Unattributable: 100ms CPU time
Main Thread Breakdown
Script Evaluation 36% Other 34% Style & Layout 20% Rendering 4%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://veo4-video.art/ | 179ms | 4ms | 6ms | 1st |
| https://veo4-video.art/assets/framework-DJH1pfSr.js | 159ms | 143ms | 0ms | 1st |
| Unattributable | 100ms | 8ms | 0ms | 1st |
A+Font Loading2 fonts (21 KB)PASS
Font Loading
2 fonts (21 KB)
2 fonts (21 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
21 KB total
Render-blocking
0
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 31 ms
Start 79 ms
Risk FOUT — text flashes from fallback to web font
outfit-be21ba2a.woff2 woff2 swap
Size 14 KB
Load time 69 ms
Start 79 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 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
A+Resource HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
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+Document CompressionDocument response uses brotliPASS
Document Compression
Document response uses brotli
Document 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+Main HTML Cache-ControlMain HTML max-age=0 (≤ 5min) is appropriatePASS
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public, max-age=0, s-maxage=60, must-revalidate
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.
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
Asset CompressionNo text asset hosts to measureINFO
Asset Compression
No text asset hosts to measure
No text asset hosts to measure
Info::
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 Waterfall86 requests over 766msINFO
Network Waterfall
86 requests over 766ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization4 images, 28 KB total, 0 KB wastedINFO
Image Optimization
4 images, 28 KB total, 0 KB wasted
Image Optimization Audit
Total Images
4
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.