Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
5.88 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.98 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
69 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.041
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.46 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.
8.02 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
BJS Execution Cost889ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 277ms | 78ms | 0ms | 3rd |
| https://gw.alipayobjects.com/render/p/yuyan_v/180020010000000339/4.22.0/index.js | 205ms | 142ms | 45ms | 3rd |
| https://gw.alipayobjects.com/render/p/yuyan/180020010000000069/index2.1ea0ff121.js | 164ms | 163ms | 0ms | 3rd |
| https://gw.alipayobjects.com/os/lib/react/18.2.0/umd/react.production.min.js | 126ms | 120ms | 1ms | 3rd |
| https://ds.alipay.com/?from=pc | 116ms | 29ms | 7ms | 3rd |
BJS Bundles13 scripts, 82 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://gw.alipayobjects.com/render/p/yuyan_v/180020010000000339/4.22.0/index.js | 61 KB | 40 KB (66%) | ✓ | 3rd |
| https://gw.alipayobjects.com/render/p/yuyan/180020010000000069/core-js.4a81462ee.js | 45 KB | 22 KB (49%) | ✓ | 3rd |
| https://gw.alipayobjects.com/render/p/yuyan/180020010000000069/common.f2ee8e794.js | 56 KB | 20 KB (36%) | ✓ | 3rd |
| https://gw.alipayobjects.com/os/lib/react-dom/18.2.0/umd/react-dom.production.min.js | 43 KB | — | ✓ | 3rd |
| https://gw.alipayobjects.com/os/lib/alipay/yuyan-monitor-sdk/1.1.4/dist/index.umd.min.js | 18 KB | — | ✓ | 3rd |
| https://gw.alipayobjects.com/render/p/yuyan/180020010000000069/runtime.82226e22a.js | 2 KB | — | ✓ | 3rd |
| https://gw.alipayobjects.com/os/lib/react/18.2.0/umd/react.production.min.js | 5 KB | — | ✓ | 3rd |
| https://gw.alipayobjects.com/render/p/yuyan/180020010000000069/lodash-es.f13d1e2d2.js | 7 KB | — | ✓ | 3rd |
| https://gw.alipayobjects.com/render/p/yuyan/180020010000000069/crypto-js.387faa105.js | 25 KB | — | ✓ | 3rd |
| https://gw.alipayobjects.com/render/p/yuyan/180020010000000069/alipay-unified-landing.784e20b52.js | 25 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingmax-age=0, s-maxage=120, must-revalidateREVIEW
max-age=0, s-maxage=120, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| max-age | 0 | Cache for 0 seconds |
| s-maxage | 120 | CDN caches for 2 minutes |
| must-revalidate | — | Must recheck with server after expiry |
A+Page Weight Budget407 KB transferred, 47 requestsPASS
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization1 images, 0 KB saveablePASS
A+Font Loading1 fonts (16 KB)PASS
Web fonts
1
16 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
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)
Fixing the unchecked items could save ~5 KB and ~10 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
APage Weight Inventory47 resources · 407 KB · 82 KB savings availablePASS
~81.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 47 resources | 406.9 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall47 requests over 7101msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 277ms | 0 KB | — | ¥14/mo | Costly |
gw.alipayobjects.com gw.alipayobjects.com | Other | 205ms | 61 KB | 66% | ¥10/mo | Costly |
gw.alipayobjects.com gw.alipayobjects.com | Other | 164ms | 2 KB | — | ¥8/mo | Optional |
gw.alipayobjects.com gw.alipayobjects.com | Other | 126ms | 5 KB | — | ¥6/mo | Optional |
ds.alipay.com ds.alipay.com | Other | 116ms | 5 KB | — | ¥6/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 277ms and costs ~¥14/month
- gw.alipayobjects.com adds 205ms and costs ~¥10/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.
Learn more ▾ ▴
Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.
Source: web.dev
Unattributable takes 277ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
gw.alipayobjects.com takes 205ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
66% of gw.alipayobjects.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev