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Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
1
REVIEW
7
PASS
15
INFO
4

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
47
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.00 s

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

7.30 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.

0.466

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

7.33 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.

7.51 s

Page Load Progression

857 ms
1.7 s
2.6 s
3.4 s
4.3 s
5.1 s
6.0 s
6.9 s
Checks
27
15 PASS 7 REVIEW 1 FIX
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Page Weight Budget
1.1 MB transferred, 15 requests
REVIEW
1.1 MB transferred, 15 requests
Info::
Page weighs 1.2 MB (1.1 MB transferred)
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
15 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
15 requests
0.24 g CO2 per page load
Images 1.1 MiB 95%
JavaScript 35.9 KiB 3%
HTML 9.4 KiB 1%
CSS 7.3 KiB 1%
Other 6.2 KiB 1%
Other 220 B 0%
0 2.4 MB 4.9 MB
Under budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

B
Image Optimization
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Info::
All images are well-optimized
6 images 1.1 MB
0 oversized -0 KB
6 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
776ms total JS execution
REVIEW
776ms total JS execution
Warning::
https://ai.zhailaoban.com/showcase: 533ms CPU time
Info::
Unattributable: 243ms CPU time

Main Thread Breakdown

Style & Layout 41% Other 34% Script Evaluation 12% Rendering 9% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://ai.zhailaoban.com/showcase533ms37ms4ms1st
Unattributable243ms17ms0ms1st
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
1% third-party, 0 ms blocking
PASS
1% third-party, 0 ms blocking
Info::
Third-party code accounts for 1% of page weight (13.2 KiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
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)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A
JS Bundles
3 scripts, 0 KB unused
PASS
3 scripts, 0 KB unused
Warning::
https://ai.zhailaoban.com/static/ai_support.js?v=2...: unminified — 3 KB could be saved
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ai.zhailaoban.com/static/social_proof.js?v=14 KB—✓1st
https://ai.zhailaoban.com/static/ai_support.js?v=20260927support419 KB—✗1st
https://res.wx.qq.com/open/js/jweixin-1.6.0.js13 KB—✓3rd
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server-Timing Observability
1 Server-Timing entries advertised
PASS
1 Server-Timing entries advertised
Info::
Server-Timing header advertises 1 timing entries
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
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
Page Weight Inventory
15 resources · 1.1 MB · 0 KB savings available
PASS
15 resources · 1.1 MB · 0 KB savings available
Warning::
Page weight 1.1 MB exceeds 1 MB target by 138 KB
Got: 1.1 MB Expected: ≤ 1 MB
Info::
1 third-party resources (1% of weight)
Info::
4 resources over 200KB
15 resources · 1.1 MiB · 1 third-party 138.1 KiB over 1MB target
Image 95% · 1.1 MiB
JavaScript 3% · 35.9 KiB
Document 1% · 9.4 KiB
CSS 1% · 7.3 KiB
Other 1% · 6.4 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
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
Info::
No JavaScript blocking issues detected
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Asset Compression
No text asset hosts to measure
INFO
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 Waterfall
15 requests over 7664ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 2.0 s LCP 7.3 shttps://ai.zhailaoban.com/showcase/showcase https://ai.zhailaoban.com/showcase — 200 — 9.4 KiB — 2.9 s — http/1.1https://ai.zhailaoban.com/static/social_proof.css?v=1/static/social_proof.css?v=1 https://ai.zhailaoban.com/static/social_proof.css?v=1 — 200 — 1.8 KiB — 1.2 s — http/1.1https://ai.zhailaoban.com/static/social_proof.js?v=1/static/social_proof.js?v=1 https://ai.zhailaoban.com/static/social_proof.js?v=1 — 200 — 4.1 KiB — 703 ms — http/1.1https://ai.zhailaoban.com/static/logo-128.png/static/logo-128.png https://ai.zhailaoban.com/static/logo-128.png — 200 — 21.6 KiB — 964 ms — http/1.1https://ai.zhailaoban.com/static/ai_support.css?v=20260927support4/static/ai_support.css?v=20260927su... https://ai.zhailaoban.com/static/ai_support.css?v=20260927support4 — 200 — 5.6 KiB — 568 ms — http/1.1https://ai.zhailaoban.com/static/beian.png/static/beian.png https://ai.zhailaoban.com/static/beian.png — 200 — 1.7 KiB — 755 ms — http/1.1https://ai.zhailaoban.com/static/ai_support.js?v=20260927support4/static/ai_support.js?v=20260927sup... https://ai.zhailaoban.com/static/ai_support.js?v=20260927support4 — 200 — 18.6 KiB — 1.5 s — http/1.1https://res.wx.qq.com/open/js/jweixin-1.6.0.jsres.wx.qq.com/open/js/jweixin-1.6.0... https://res.wx.qq.com/open/js/jweixin-1.6.0.js — 200 — 13.2 KiB — 910 ms — http/1.1https://ai.zhailaoban.com/api/public/video-showcase/api/public/video-showcase https://ai.zhailaoban.com/api/public/video-showcase — 200 — 5.7 KiB — 188 ms — http/1.1https://ai.zhailaoban.com/api/public/activity/api/public/activity https://ai.zhailaoban.com/api/public/activity — 200 — 520 B — 411 ms — http/1.1https://ai.zhailaoban.com/api/public/video-showcase/media/ppt-portrait-kids-grit-001/thumb/api/public/video-showcase/media/pp... https://ai.zhailaoban.com/api/public/video-showcase/media/ppt-portrait-kids-grit-001/thumb — 200 — 353.1 KiB — 3.1 s — http/1.1https://ai.zhailaoban.com/api/public/video-showcase/media/ppt-portrait-you-can-001/thumb/api/public/video-showcase/media/pp... https://ai.zhailaoban.com/api/public/video-showcase/media/ppt-portrait-you-can-001/thumb — 200 — 259.8 KiB — 2.7 s — http/1.1https://ai.zhailaoban.com/api/public/video-showcase/media/ppt-landscape-liberal-arts-001/thumb/api/public/video-showcase/media/pp... https://ai.zhailaoban.com/api/public/video-showcase/media/ppt-landscape-liberal-arts-001/thumb — 200 — 240.1 KiB — 2.9 s — http/1.1https://ai.zhailaoban.com/api/public/video-showcase/media/ppt-landscape-ai-expression-001/thumb/api/public/video-showcase/media/pp... https://ai.zhailaoban.com/api/public/video-showcase/media/ppt-landscape-ai-expression-001/thumb — 200 — 226.6 KiB — 2.5 s — http/1.1https://ai.zhailaoban.com/favicon.ico/favicon.ico https://ai.zhailaoban.com/favicon.ico — 404 — 220 B — 178 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-09-05 — 2026-10-02)

LCP (p75)

1072 ms

90% good

INP (p75)

0 ms

0% good

CLS (p75)

0.000

0% good

FCP (p75)

643 ms

TTFB (p75)

357 ms

Image Optimization
37 images, 1101 KB total, 999 KB wasted
INFO

Image Optimization Audit

Total Images

37

Total Size

1101 KB

Oversized

5

Wasted

999 KB

36 missing dimensions 2 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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