Performance

· 15 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

Mobile Desktop

Performance

Accessibility

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.

3.13 s

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

3.75 s

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

144 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.022

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.56 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.

3.87 s

Page Load Progression

1.2 s

2.4 s

3.6 s

4.8 s

5.9 s

7.1 s

8.3 s

9.5 s

Checks

7 PASS 2 REVIEW 4 FIX

Page Weight Budget

Action

2.9 MB transferred, 426 requests

FIX

2.9 MB transferred, 426 requests

Page weighs 5.5 MB (2.9 MB transferred)

Images are 2.2 MB — compress or use modern formats

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

Got: 2.2 MB

426 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 0.60 g CO2 per page load

2.9 MB transferred

426 requests

0.60 g CO2 per page load

Images 2.2 MiB 77%

HTML 407.5 KiB 14%

JavaScript 231.2 KiB 8%

Other 13.1 KiB 0%

CSS 12.6 KiB 0%

Other 2.0 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (2.9 MiB of 2.9 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

JS Execution Cost

Action

3958ms total JS execution

FIX

3958ms total JS execution

Unattributable: 1975ms CPU time

https://www.zol.com.cn/: 870ms CPU time

https://stat.zol.com.cn/adrs/bms_tag.php?0.8397707...: 301ms CPU time

https://cdn.adwork.net/js/makemoney.js: 150ms CPU time

https://icon.zol-img.com.cn/public/js/jq-with-migr...: 140ms CPU time

Third-party scripts: 3958ms (100% of total)

Main Thread Breakdown

Other 44% Parse HTML & CSS 21% Script Evaluation 17% Style & Layout 12%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	1975ms	12ms	0ms	3rd
https://www.zol.com.cn/	870ms	59ms	4ms	3rd
https://stat.zol.com.cn/adrs/bms_tag.php?0.8397707043610042	301ms	284ms	4ms	3rd
https://cdn.adwork.net/js/makemoney.js	150ms	103ms	1ms	3rd
https://icon.zol-img.com.cn/public/js/jq-with-migrate3.js	140ms	65ms	16ms	3rd
https://nb.zol.com.cn/	91ms	8ms	3ms	3rd
https://cdn.wwads.cn/js/fp-3.3.6.min.js	88ms	29ms	0ms	3rd
https://nb.zol.com.cn/yxb/	81ms	7ms	5ms	3rd
https://icon.zol-img.com.cn/src/index/z.page.index.1.0.0.js	77ms	62ms	3ms	3rd
https://detail.zol.com.cn/notebook_index/subcate16_list_1.html	69ms	4ms	2ms	3rd

Showing top 10 of 12 scripts

Page Weight Inventory

Action

426 resources · 2.9 MB · 0 KB savings available

FIX

426 resources · 2.9 MB · 0 KB savings available

Page weight 1.9 MB over 1MB target

Got: 2.9 MB Expected: ≤ 1 MB

425 third-party resources (100% of weight)

2 resources over 200KB

426 resources · 2.9 MiB · 425 third-party 1.9 MiB over 1MB target

Image 77% · 2.2 MiB

Document 14% · 407.8 KiB

JavaScript 8% · 231.2 KiB

Other 0% · 13.1 KiB

CSS 0% · 12.6 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

426 resources			2.9 MiB

Image Optimization

141 images, 0 KB saveable

REVIEW

141 images, 0 KB saveable

All images are well-optimized

141 images 2.2 MB

0 oversized -0 KB

139 legacy format

0 missing dimensions CLS risk

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+

JS Bundles

126 scripts, 0 KB unused

PASS

126 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://icon.zol-img.com.cn/public/js/jq-with-migrate3.js	44 KB	—	✓	3rd
https://icon.zol-img.com.cn/public/js/web_foot.js	4 KB	—	✓	3rd
https://p.zol-img.com.cn/da/index.js	7 KB	—	✓	3rd
https://icon.zol-img.com.cn/src/index/z.page.index.1.0.0.js	14 KB	—	✓	3rd
https://icon.zol-img.com.cn/public/js/jq-with-migrate3.js	0 KB	—	✓	3rd
https://cdn.adwork.net/js/makemoney.js	25 KB	—	✓	3rd
https://cdn.wwads.cn/js/makemoney.js	7 KB	—	✓	3rd
https://js.zol.com.cn/pvn/z.pv	18 KB	—	✓	3rd
https://zdw.w8.com.cn/p.ht?h=&t=1776812&c=	6 KB	—	✓	3rd
https://stat.zol.com.cn/adrs/cg_gmine.js	1 KB	—	✓	3rd

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

HTTP Caching

max-age=120 (2 minutes)

PASS

max-age=120 (2 minutes)

Cache-Control header is set

Got: max-age=120

Effective TTL: 2 minutes (max-age=120)

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

max-age=120

Directive	Value	Meaning
max-age	120	Cache for 2 minutes

Effective TTL: 120 seconds

Network Waterfall

426 requests over 8770ms

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 3958ms · 71KB · ¥195/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	1975ms	0 KB	—	¥97/mo	Costly
www.zol.com.cn www.zol.com.cn	Other	870ms	3 KB	—	¥43/mo	Costly
stat.zol.com.cn stat.zol.com.cn	Other	301ms	3 KB	—	¥15/mo	Costly
cdn.adwork.net cdn.adwork.net	Other	150ms	25 KB	—	¥7/mo	Optional
icon.zol-img.com.cn icon.zol-img.com.cn	Other	140ms	0 KB	—	¥7/mo	Optional
nb.zol.com.cn nb.zol.com.cn	Other	91ms	3 KB	—	¥4/mo	Optional
cdn.wwads.cn cdn.wwads.cn	Other	88ms	14 KB	—	¥4/mo	Optional
nb.zol.com.cn nb.zol.com.cn	Other	81ms	3 KB	—	¥4/mo	Optional
icon.zol-img.com.cn icon.zol-img.com.cn	Other	77ms	14 KB	—	¥4/mo	Optional
detail.zol.com.cn detail.zol.com.cn	Other	69ms	3 KB	—	¥3/mo	Optional
nb.zol.com.cn nb.zol.com.cn	Other	62ms	3 KB	—	¥3/mo	Optional
s.zol-img.com.cn s.zol-img.com.cn	Other	54ms	0 KB	—	¥3/mo	Optional

Unattributable

Other

Costly

Execution 1975ms

Transfer 0 KB

Monthly Cost ¥97/mo

www.zol.com.cn

Other

Costly

Execution 870ms

Transfer 3 KB

Monthly Cost ¥43/mo

stat.zol.com.cn

Other

Costly

Execution 301ms

Transfer 3 KB

Monthly Cost ¥15/mo

cdn.adwork.net

Other

Optional

Execution 150ms

Transfer 25 KB

Monthly Cost ¥7/mo

icon.zol-img.com.cn

Other

Optional

Execution 140ms

Transfer 0 KB

Monthly Cost ¥7/mo

nb.zol.com.cn

Other

Optional

Execution 91ms

Transfer 3 KB

Monthly Cost ¥4/mo

cdn.wwads.cn

Other

Optional

Execution 88ms

Transfer 14 KB

Monthly Cost ¥4/mo

nb.zol.com.cn

Other

Optional

Execution 81ms

Transfer 3 KB

Monthly Cost ¥4/mo

icon.zol-img.com.cn

Other

Optional

Execution 77ms

Transfer 14 KB

Monthly Cost ¥4/mo

detail.zol.com.cn

Other

Optional

Execution 69ms

Transfer 3 KB

Monthly Cost ¥3/mo

nb.zol.com.cn

Other

Optional

Execution 62ms

Transfer 3 KB

Monthly Cost ¥3/mo

s.zol-img.com.cn

Other

Optional

Execution 54ms

Transfer 0 KB

Monthly Cost ¥3/mo

These scripts may cost more than they're worth

Unattributable adds 1975ms and costs ~¥97/month
www.zol.com.cn adds 870ms and costs ~¥43/month
stat.zol.com.cn adds 301ms and costs ~¥15/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

Unattributable takes 1975ms 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

www.zol.com.cn takes 870ms 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

stat.zol.com.cn takes 301ms 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.