Performance
· 15 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.
3.34 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
10.93 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
24 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.048
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.89 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.
11.31 s
Page Load Progression
FPage Weight BudgetAction29.7 MB transferred, 421 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction7138ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.720yun.com/ | 6057ms | 482ms | 0ms | 3rd |
| Unattributable | 579ms | 2ms | 0ms | 3rd |
| https://static-t.720static.com/render-20260417/_next/static/chunks/a17454856d8485b2e6bd.js | 180ms | 150ms | 0ms | 3rd |
| https://hm.baidu.com/hm.js?08a05dadf3e5b6d1c99fc4d862897e31 | 159ms | 38ms | 1ms | 3rd |
| https://player-t.720static.com/krp/krp_player_1.20.11.js | 97ms | 88ms | 6ms | 3rd |
| https://static-t.720static.com/render-20260417/_next/static/chunks/a034ed8a556e25244dc2.js | 67ms | 61ms | 3ms | 3rd |
DJS BundlesAction62 scripts, 353 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://static-t.720static.com/render-20260417/_next/static/chunks/03310622fbb05fc127f3.js | 0 KB | 67 KB (96%) | ✓ | 3rd |
| https://static-t.720static.com/render-20260417/_next/static/chunks/03310622fbb05fc127f3.js | 70 KB | 67 KB (96%) | ✓ | 3rd |
| https://static-t.720static.com/render-20260417/_next/static/chunks/704b6cc272e8bf69a300.js | 46 KB | 40 KB (87%) | ✓ | 3rd |
| https://static-t.720static.com/render-20260417/_next/static/chunks/7bf4b730d8e189578957.js | 0 KB | 32 KB (62%) | ✓ | 3rd |
| https://static-t.720static.com/render-20260417/_next/static/chunks/7bf4b730d8e189578957.js | 52 KB | 32 KB (62%) | ✓ | 3rd |
| https://static-t.720static.com/render-20260417/_next/static/chunks/fa1a989ee631d2a2058b.js | 45 KB | 29 KB (64%) | ✓ | 3rd |
| https://static-t.720static.com/render-20260417/_next/static/chunks/a883e6c964a1fc3aa04c.js | 35 KB | 24 KB (69%) | ✓ | 3rd |
| https://static-t.720static.com/render-20260417/_next/static/chunks/a034ed8a556e25244dc2.js | 31 KB | 21 KB (69%) | ✓ | 3rd |
| https://static-t.720static.com/render-20260417/_next/static/chunks/e5036c516bb24f81d613.js | 29 KB | 20 KB (72%) | ✓ | 3rd |
| https://static-t.720static.com/render-20260417/_next/static/chunks/e5036c516bb24f81d613.js | 0 KB | 20 KB (72%) | ✓ | 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
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
DPage Weight InventoryAction421 resources · 29.7 MB · 353 KB savings availableFIX
~353.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 421 resources | 29.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction324 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font LoadingNo web fonts (system fonts)PASS
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall421 requests over 12411msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.720yun.com www.720yun.com | Other | 6057ms | 46 KB | — | ¥299/mo | Costly |
Unattributable Unattributable | Other | 579ms | 0 KB | — | ¥29/mo | Costly |
static-t.720static.com static-t.720static.com | Other | 180ms | 0 KB | — | ¥9/mo | Optional |
hm.baidu.com hm.baidu.com | Other | 159ms | 12 KB | — | ¥8/mo | Optional |
player-t.720static.com player-t.720static.com | Other | 97ms | 167 KB | — | ¥5/mo | Optional |
static-t.720static.com static-t.720static.com | Other | 67ms | 31 KB | 69% | ¥3/mo | Optional |
These scripts may cost more than they're worth
- www.720yun.com adds 6057ms and costs ~¥299/month
- Unattributable adds 579ms and costs ~¥29/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
www.720yun.com takes 6057ms 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
Unattributable takes 579ms 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
69% of static-t.720static.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