Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Performance

Accessibility

100

Best Practices

SEO

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

9.28 s

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

11.08 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

509 ms

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.

12.77 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.

11.13 s

Page Load Progression

1.4 s

2.8 s

4.2 s

5.6 s

6.9 s

8.3 s

9.7 s

11.1 s

Checks

7 PASS 3 REVIEW 5 FIX

Page Weight Budget

Action

4.9 MB transferred, 88 requests

FIX

4.9 MB transferred, 88 requests

Page weighs 4.9 MB (4.9 MB transferred)

Images are 4.1 MB — compress or use modern formats

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

Got: 4.1 MB

JavaScript is 755 KB — consider code splitting or lazy loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Got: 755 KB

88 HTTP requests

Estimated 1.0 g CO2 per page load

4.9 MB transferred

88 requests

1.0 g CO2 per page load

Images 4.1 MiB 83%

JavaScript 754.5 KiB 15%

CSS 53.0 KiB 1%

Other 15.8 KiB 0%

HTML 6.9 KiB 0%

Other 1.9 KiB 0%

0 2.4 MB 4.9 MB

Over 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

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (4.9 MiB of 4.9 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

JS Execution Cost

Action

2862ms total JS execution

FIX

2862ms total JS execution

https://statics.ys7.com/home/mobile/dist/main.js?6...: 1724ms CPU time

Unattributable: 586ms CPU time

https://m.ys7.com/: 553ms CPU time

Third-party scripts: 2862ms (100% of total)

Main Thread Breakdown

Script Evaluation 39% Other 35% Style & Layout 15% Rendering 6% Script Parsing & Compilation 4%

Script	Total	Scripting	Parse/Compile	Party
https://statics.ys7.com/home/mobile/dist/main.js?6111323469	1724ms	1085ms	89ms	3rd
Unattributable	586ms	8ms	0ms	3rd
https://m.ys7.com/	553ms	12ms	6ms	3rd

Page Weight Inventory

Action

88 resources · 4.9 MB · 239 KB savings available

FIX

88 resources · 4.9 MB · 239 KB savings available

Page weight 3.9 MB over 1MB target

Got: 4.9 MB Expected: ≤ 1 MB

~239 KB of savings available

87 third-party resources (100% of weight)

5 resources over 200KB

88 resources · 4.9 MiB · 87 third-party 3.9 MiB over 1MB target

Image 83% · 4.1 MiB

JavaScript 15% · 754.5 KiB

CSS 1% · 53.0 KiB

Other 0% · 15.8 KiB

Document 0% · 7.4 KiB

~238.6 KiB of savings available

Remove unused JavaScript: 238.6 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

88 resources			4.9 MiB

HTTP Caching

Action

No cache headers

FIX

No cache headers

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.

Image Optimization

72 images, 0 KB saveable

REVIEW

72 images, 0 KB saveable

All images are well-optimized

72 images 4.1 MB

0 oversized -0 KB

56 legacy format

0 missing dimensions CLS risk

JS Bundles

Action

6 scripts, 239 KB unused

REVIEW

6 scripts, 239 KB unused

https://statics.ys7.com/home/mobile/dist/main.js?6...: 203 KB unused (30%)

Consider code splitting or tree shaking to reduce unused code.

https://statics.ys7.com/newmall/??mobile/js/lib.js...: 35 KB unused (60%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 239 KB

239 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://statics.ys7.com/home/mobile/dist/main.js?6111323469	687 KB	203 KB (30%)	✓	3rd
https://statics.ys7.com/newmall/??mobile/js/lib.js?6111323469,mobile/js/widget/combo/seajs_combo.js?6111323469,mobile/js/widget/ysbridge/ysapp-bridge.js?6111323469,mobile/js/utils/phoneIFObj.js?6111323469,common/js/widget/count/count_new.js?6111323469	60 KB	35 KB (60%)	✓	3rd
https://statics.ys7.com/newmall/common/js/widget/jsBetter/js_better_sdk.js?6111323469	2 KB	—	✓	3rd
https://statics.ys7.com/newmall/common/js/widget/public/public.js?6111323469	2 KB	—	✓	3rd
https://statics.ys7.com/newmall/mobile/js/business/home/mallTabs.js?6111323469	3 KB	—	✓	3rd
https://stats.ys7.com/?cookieId=undefind&ua=Mozilla%2F5.0%20(Linux%3B%20Android%2011%3B%20moto%20g%20power%20(2022))%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F146.0.0.0%20Mobile%20Safari%2F537.36&ip=undefined&refurl=&url=https%3A%2F%2Fm.ys7.com%2F&screenX=412&screenY=823&os=Linux%20x86_64&browser=Chrome&browserLang=&title=%E8%90%A4%E7%9F%B3%20-%20%E5%AE%89%E5%85%A8%E6%99%BA%E8%83%BD%E5%AE%B6%E5%B1%85%E4%B8%93%E5%AE%B6%20-%20%E5%AE%98%E6%96%B9%E5%95%86%E5%9F%8E&loadtime=8781&logtype=1&is_mobile=1	0 KB	—	✓	3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Text Compression

All text resources are compressed

PASS

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)

No web fonts loaded — system fonts are fastest

No web fonts loaded — system fonts are optimal.

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

Network Waterfall

88 requests over 9486ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

100% of JavaScript execution is third-party

First-party Third-party 2862ms · 694KB · ¥141/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
statics.ys7.com statics.ys7.com	Other	1724ms	687 KB	30%	¥85/mo	Costly
Unattributable Unattributable	Other	586ms	0 KB	—	¥29/mo	Costly
m.ys7.com m.ys7.com	Other	553ms	7 KB	—	¥27/mo	Costly

statics.ys7.com

Other

Costly

Execution 1724ms

Transfer 687 KB

Unused 30%

Monthly Cost ¥85/mo

Unattributable

Other

Costly

Execution 586ms

Transfer 0 KB

Monthly Cost ¥29/mo

m.ys7.com

Other

Costly

Execution 553ms

Transfer 7 KB

Monthly Cost ¥27/mo

These scripts may cost more than they're worth

statics.ys7.com adds 1724ms and costs ~¥85/month
Unattributable adds 586ms and costs ~¥29/month
m.ys7.com adds 553ms and costs ~¥27/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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

statics.ys7.com takes 1724ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 586ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

m.ys7.com takes 553ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.