Performance
· 16 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.
3.44 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
30.21 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
5.01 s
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.
11.02 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.
36.37 s
Page Load Progression
FPage Weight BudgetAction5.7 MB transferred, 570 requestsFIX
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 CostAction13913ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 1393ms | 110ms | 0ms | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/49687.a056c899724721a817b2.js | 1290ms | 1180ms | 2ms | 3rd |
| https://m.shein.com/es/?cdn_rsite=cf&ref=www&rep=dir&ret=mes | 1265ms | 431ms | 83ms | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/common-f318b83461a5aee34576.js | 1246ms | 1124ms | 8ms | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/config_index-92e301ee44c236986c16.js | 1210ms | 1109ms | 0ms | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/libs/infp/infp.3.11.1.min.js | 1066ms | 887ms | 31ms | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/gsap-65ce1f43f2484d8c39bd.js | 731ms | 109ms | 8ms | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/sl_container.d3f0cc854d61716f552e.js | 482ms | 464ms | 16ms | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/69117-0e883318d43e32c1009c.js | 469ms | 327ms | 7ms | 3rd |
| https://common.ltwebstatic.com/dist_bundle/xjqHR52UWJdjKJ0x6QrCsus66rNXR9/2.0.13/1/main.js | 462ms | 417ms | 15ms | 3rd |
Showing top 10 of 38 scripts
FJS BundlesAction320 scripts, 1.3 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://sheinm.ltwebstatic.com/pwa_dist/assets/33480-ed5a729aa186ec8cfb01.js | 238 KB | 159 KB (67%) | ✓ | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/92062-53d222de13fe9eb2faba.js | 267 KB | 120 KB (45%) | ✓ | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/83122-b986aa5d0b0e63a3da1c.js | 205 KB | 92 KB (45%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 72 KB (76%) | ✓ | 3rd |
| https://sheinh5.ltwebstatic.com/game_dist/public/client/js/lottie.1.3.3.min.js | 79 KB | 69 KB (88%) | ✓ | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/56942-2432e2f65d0abbbe1f44.js | 118 KB | 62 KB (53%) | ✓ | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/goods_detail.56361d10b8c41a543ba5.js | 149 KB | 54 KB (36%) | ✓ | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/66723-3589f8ecbdea87518078.js | 53 KB | 48 KB (92%) | ✓ | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/product-card-mobile-75e0e12baca545d8e7e4.js | 98 KB | 46 KB (48%) | ✓ | 3rd |
| https://sheinm.ltwebstatic.com/pwa_dist/assets/category.b85f83ad6708ef847778.js | 0 KB | 42 KB (90%) | ✓ | 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
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization92 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
A+Text CompressionAll text resources are compressedPASS
A+Font Loading1 fonts (49 KB)PASS
Web fonts
1
49 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 Hints88 hints, 0 missing preconnectsPASS
Current Resource Hints
88 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall570 requests over 0msINFO
Performance analysis not available for this result.
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 1393ms | 0 KB | — | S$24/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 1290ms | 0 KB | — | S$22/mo | Costly |
m.shein.com m.shein.com | Other | 1265ms | 168 KB | — | S$22/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 1246ms | 26 KB | — | S$22/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 1210ms | 1 KB | — | S$21/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 1066ms | 111 KB | 23% | S$18/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 731ms | 24 KB | — | S$13/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 482ms | 51 KB | 49% | S$8/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 469ms | 34 KB | — | S$8/mo | Costly |
common.ltwebstatic.com common.ltwebstatic.com | Other | 462ms | 59 KB | — | S$8/mo | Costly |
m.shein.com m.shein.com | Other | 321ms | 0 KB | — | S$6/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 302ms | 149 KB | 36% | S$5/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 301ms | 31 KB | — | S$5/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 272ms | 89 KB | 34% | S$5/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 268ms | 48 KB | — | S$5/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 258ms | 0 KB | — | S$4/mo | Costly |
cjs.ltwebstatic.com cjs.ltwebstatic.com | Other | 253ms | 19 KB | — | S$4/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 253ms | 54 KB | 51% | S$4/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 236ms | 15 KB | — | S$4/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 206ms | 39 KB | — | S$4/mo | Costly |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 177ms | 9 KB | — | S$3/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 155ms | 238 KB | 67% | S$3/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 136ms | 48 KB | — | S$2/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 121ms | 4 KB | — | S$2/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 119ms | 42 KB | — | S$2/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 109ms | 267 KB | 45% | S$2/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 95ms | 205 KB | 45% | S$2/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 87ms | 16 KB | — | S$2/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 82ms | 27 KB | — | S$1/mo | Optional |
accounts.google.com accounts.google.com | Other | 74ms | 96 KB | 76% | S$1/mo | Optional |
sheinh5.ltwebstatic.com sheinh5.ltwebstatic.com | Other | 66ms | 79 KB | 88% | S$1/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 66ms | 36 KB | 68% | S$1/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 62ms | 10 KB | — | S$1/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 60ms | 27 KB | — | S$1/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 58ms | 11 KB | — | S$1/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 57ms | 10 KB | — | S$1/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 55ms | 0 KB | — | S$1/mo | Optional |
sheinm.ltwebstatic.com sheinm.ltwebstatic.com | Other | 51ms | 20 KB | — | S$1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 1393ms and costs ~S$24/month
- sheinm.ltwebstatic.com adds 1290ms and costs ~S$22/month
- m.shein.com adds 1265ms and costs ~S$22/month
- sheinm.ltwebstatic.com adds 1246ms and costs ~S$22/month
- sheinm.ltwebstatic.com adds 1210ms and costs ~S$21/month
- sheinm.ltwebstatic.com adds 1066ms and costs ~S$18/month
- sheinm.ltwebstatic.com adds 731ms and costs ~S$13/month
- sheinm.ltwebstatic.com adds 482ms and costs ~S$8/month
- sheinm.ltwebstatic.com adds 469ms and costs ~S$8/month
- common.ltwebstatic.com adds 462ms and costs ~S$8/month
- m.shein.com adds 321ms and costs ~S$6/month
- sheinm.ltwebstatic.com adds 302ms and costs ~S$5/month
- sheinm.ltwebstatic.com adds 301ms and costs ~S$5/month
- sheinm.ltwebstatic.com adds 272ms and costs ~S$5/month
- sheinm.ltwebstatic.com adds 268ms and costs ~S$5/month
- sheinm.ltwebstatic.com adds 258ms and costs ~S$4/month
- cjs.ltwebstatic.com adds 253ms and costs ~S$4/month
- sheinm.ltwebstatic.com adds 253ms and costs ~S$4/month
- sheinm.ltwebstatic.com adds 236ms and costs ~S$4/month
- sheinm.ltwebstatic.com adds 206ms and costs ~S$4/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 1393ms 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
sheinm.ltwebstatic.com takes 1290ms 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.shein.com takes 1265ms 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
sheinm.ltwebstatic.com takes 1246ms 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
sheinm.ltwebstatic.com takes 1210ms 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
sheinm.ltwebstatic.com takes 1066ms 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
sheinm.ltwebstatic.com takes 731ms 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
sheinm.ltwebstatic.com takes 482ms 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
sheinm.ltwebstatic.com takes 469ms 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
common.ltwebstatic.com takes 462ms 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.shein.com takes 321ms 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
sheinm.ltwebstatic.com takes 302ms 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
sheinm.ltwebstatic.com takes 301ms 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
sheinm.ltwebstatic.com takes 272ms 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
sheinm.ltwebstatic.com takes 268ms 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
sheinm.ltwebstatic.com takes 258ms 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
cjs.ltwebstatic.com takes 253ms 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
sheinm.ltwebstatic.com takes 253ms 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
51% of sheinm.ltwebstatic.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
sheinm.ltwebstatic.com takes 236ms 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
sheinm.ltwebstatic.com takes 206ms 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
67% of sheinm.ltwebstatic.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
76% of accounts.google.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
88% of sheinh5.ltwebstatic.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
68% of sheinm.ltwebstatic.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