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.
5.24 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
11.63 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
447 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.003
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.39 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.
11.65 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2973ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 821ms | 205ms | 0ms | 3rd |
| https://m.ctrip.com/html5/ | 402ms | 31ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-B77BES1Z8Z&cx=c&_slc=1 | 326ms | 272ms | 51ms | 3rd |
| https://aw-s.tripcdn.com/NFES/html5/1741677121456/_next/static/chunks/pages/index-7e5657ae45e1cac81a16.js | 283ms | 147ms | 9ms | 3rd |
| https://static.tripcdn.com/packages/ubt/websdk/*/ubt.minh.js?d=2026421 | 228ms | 200ms | 7ms | 3rd |
| https://webresource.c-ctrip.com/ares2/train/csec/5.1.3/default/sec/c-sec.js?v=2026421 | 144ms | 135ms | 7ms | 3rd |
| https://static.tripcdn.com/packages/market/mkt-union-tracing/*/ResAdvOnline/sales/wakeup.v2.0.js?v=202647165317 | 130ms | 105ms | 21ms | 3rd |
| https://aw-s.tripcdn.com/NFES/html5/1741677121456/_next/static/chunks/commons.2891ecd524c64ff7c7f6.js | 119ms | 99ms | 15ms | 3rd |
| https://aw-s.tripcdn.com/packages/ares/nfes-libs/2.0.50/foundation.js | 111ms | 99ms | 4ms | 3rd |
| https://aw-s.tripcdn.com/NFES/html5/1741677121456/_next/serverStatic/js/vendor.js | 80ms | 70ms | 2ms | 3rd |
Showing top 10 of 15 scripts
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization105 images, 0 KB saveableREVIEW
BJS Bundles38 scripts, 90 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-B77BES1Z8Z&cx=c&_slc=1 | 180 KB | 67 KB (37%) | ✓ | 3rd |
| https://static.tripcdn.com/packages/market/mktadsdk/%5E1.0.0/new/js/aSlide.umd.min.js | 41 KB | 24 KB (60%) | ✓ | 3rd |
| https://www.google-analytics.com/analytics.js | 21 KB | — | ✓ | 3rd |
| https://aw-s.tripcdn.com/NFES/html5/1741677121456/_next/static/chunks/nfes.85c7ae101756a710f59a.js | 32 KB | — | ✓ | 3rd |
| https://aw-s.tripcdn.com/NFES/html5/1741677121456/_next/static/chunks/react.597261033f18738cb43d.js | 34 KB | — | ✓ | 3rd |
| https://aw-s.tripcdn.com/NFES/html5/1741677121456/_next/static/chunks/commons.2891ecd524c64ff7c7f6.js | 22 KB | — | ✓ | 3rd |
| https://aw-s.tripcdn.com/NFES/html5/1741677121456/_next/static/chunks/pages/_app-dac5431e524f7b76a3b5.js | 1 KB | — | ✓ | 3rd |
| https://aw-s.tripcdn.com/NFES/html5/1741677121456/_next/static/chunks/fa8d585d845e6f2fe0882d771a2e6987c1f1926c.516d37fd9c7fa47a7fdf.js | 19 KB | — | ✓ | 3rd |
| https://aw-s.tripcdn.com/NFES/html5/1741677121456/_next/static/chunks/pages/index-7e5657ae45e1cac81a16.js | 24 KB | — | ✓ | 3rd |
| https://webresource.c-ctrip.com/ResH5SearchOnline/h5globalsearch.js?20150617 | 6 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
APage Weight Budget1.0 MB transferred, 168 requestsPASS
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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading1 fonts (2 KB)PASS
Web fonts
1
2 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
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
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints17 hints, 0 missing preconnectsPASS
Current Resource Hints
17 resource hints configured
APage Weight Inventory168 resources · 1.0 MB · 90 KB savings availablePASS
~90.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 168 resources | 1.0 MiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall168 requests over 5761msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 821ms | 0 KB | — | ¥40/mo | Costly |
m.ctrip.com m.ctrip.com | Other | 402ms | 11 KB | — | ¥20/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 326ms | 180 KB | 37% | ¥16/mo | Costly |
aw-s.tripcdn.com aw-s.tripcdn.com | Other | 283ms | 24 KB | — | ¥14/mo | Costly |
static.tripcdn.com static.tripcdn.com | Other | 228ms | 25 KB | — | ¥11/mo | Costly |
webresource.c-ctrip.com webresource.c-ctrip.com | Other | 144ms | 26 KB | — | ¥7/mo | Optional |
static.tripcdn.com static.tripcdn.com | Other | 130ms | 55 KB | — | ¥6/mo | Optional |
aw-s.tripcdn.com aw-s.tripcdn.com | Other | 119ms | 22 KB | — | ¥6/mo | Optional |
aw-s.tripcdn.com aw-s.tripcdn.com | Other | 111ms | 14 KB | — | ¥5/mo | Optional |
aw-s.tripcdn.com aw-s.tripcdn.com | Other | 80ms | 7 KB | — | ¥4/mo | Optional |
static.tripcdn.com static.tripcdn.com | Other | 74ms | 22 KB | — | ¥4/mo | Optional |
webresource.c-ctrip.com webresource.c-ctrip.com | Other | 70ms | 16 KB | — | ¥3/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 67ms | 21 KB | — | ¥3/mo | Optional |
static.tripcdn.com static.tripcdn.com | Other | 61ms | 41 KB | 60% | ¥3/mo | Optional |
static.tripcdn.com static.tripcdn.com | Other | 56ms | 20 KB | — | ¥3/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 821ms and costs ~¥40/month
- m.ctrip.com adds 402ms and costs ~¥20/month
- Google Tag Manager adds 326ms and costs ~¥16/month
- aw-s.tripcdn.com adds 283ms and costs ~¥14/month
- static.tripcdn.com adds 228ms and costs ~¥11/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 821ms 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
m.ctrip.com takes 402ms 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
Google Tag Manager takes 326ms 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
aw-s.tripcdn.com takes 283ms 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
static.tripcdn.com takes 228ms 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
60% of static.tripcdn.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