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https://xuexi.cn

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
21
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
79
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
42
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

5.02 s

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

49.01 s

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

3.98 s

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

0.133

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

36.83 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.

102.09 s

Page Load Progression

1.5 s
3.1 s
4.6 s
6.1 s
7.6 s
9.2 s
10.7 s
12.2 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
24.6 MB transferred, 237 requests
FIX
24.6 MB transferred, 237 requests
Critical::
Page weighs 40.8 MB (24.6 MB transferred)
Warning::
Images are 20.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 20.4 MB
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Warning::
237 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 5.2 g CO2 per page load
24.6 MB / 2.4 MB budget
24.6 MB transferred
237 requests
5.2 g CO2 per page load
Images 20.4 MiB 83%
Other 3.0 MiB 12%
JavaScript 1.2 MiB 5%
HTML 8.6 KiB 0%
CSS 6.3 KiB 0%
Other 6.1 KiB 0%
Other 2.1 KiB 0%
Fonts 1.3 KiB 0%
Other 0 B 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

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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (24.6 MiB of 24.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
19572ms total JS execution
FIX
19572ms total JS execution
Warning::
https://www.xuexi.cn/lgpage/page/index.entry.ce2ef...: 15691ms CPU time
Warning::
https://www.xuexi.cn/index.html: 1882ms CPU time
Warning::
Unattributable: 886ms CPU time
Warning::
https://www.xuexi.cn/lgpage/common/vendor.cced4e.j...: 459ms CPU time
Warning::
https://long-term-cache.xuexi.cn/common/itrace-sdk...: 442ms CPU time
Warning::
Third-party scripts: 19572ms (100% of total)

Main Thread Breakdown

Script Evaluation 64% Other 15% Style & Layout 11% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js15691ms12009ms265ms3rd
https://www.xuexi.cn/index.html1882ms36ms9ms3rd
Unattributable886ms12ms0ms3rd
https://www.xuexi.cn/lgpage/common/vendor.cced4e.js459ms270ms178ms3rd
https://long-term-cache.xuexi.cn/common/itrace-sdk-117.js442ms38ms5ms3rd
https://www.xuexi.cn/lgpage/lib/gray-pub-sdk.chunk.7a00bc.js155ms98ms56ms3rd
https://retcode.alicdn.com/retcode/bl.js58ms45ms6ms3rd
F
JS Bundles
Action
5 scripts, 939 KB unused
FIX
5 scripts, 939 KB unused
Warning::
https://www.xuexi.cn/lgpage/page/index.entry.ce2ef...: 467 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.xuexi.cn/lgpage/common/vendor.cced4e.j...: 372 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.xuexi.cn/lgpage/lib/gray-pub-sdk.chunk...: 100 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 939 KB
939 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js574 KB467 KB (82%)✓3rd
https://www.xuexi.cn/lgpage/common/vendor.cced4e.js535 KB372 KB (70%)✓3rd
https://www.xuexi.cn/lgpage/lib/gray-pub-sdk.chunk.7a00bc.js136 KB100 KB (75%)✓3rd
https://retcode.alicdn.com/retcode/bl.js15 KB—✓3rd
https://long-term-cache.xuexi.cn/common/itrace-sdk-117.js17 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

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

F
Page Weight Inventory
Action
237 resources · 24.6 MB · 939 KB savings available
FIX
237 resources · 24.6 MB · 939 KB savings available
Warning::
Page weight 23.6 MB over 1MB target
Got: 24.6 MB Expected: ≤ 1 MB
Info::
~939 KB of savings available
Warning::
236 third-party resources (100% of weight)
Info::
22 resources over 200KB
237 resources · 24.6 MiB · 236 third-party 23.6 MiB over 1MB target
Image 83% · 20.4 MiB
Other 12% · 3.0 MiB
JavaScript 5% · 1.2 MiB
Document 0% · 15.5 KiB
CSS 0% · 6.3 KiB
Font 0% · 1.3 KiB

~938.8 KiB of savings available

Remove unused JavaScript: 938.8 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
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.

C
Image Optimization
Action
199 images, 0 KB saveable
REVIEW
199 images, 0 KB saveable
Warning::
https://boot-img.xuexi.cn/lego/image/6061_wUsoFr-5... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://boot-img.xuexi.cn/lego/image/1584_qiangjun... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://boot-img.xuexi.cn/lego/image/6559_PLXnlp4F... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/e09f433c69164... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://boot-img.xuexi.cn/lego/image/3172_71534e05... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/69830c9e173b5... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/607f2b3670c00... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/f8fd7d4c29dfe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://boot-img.xuexi.cn/lego/image/3172_71534e05... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/50214eba7cb1b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/963274d57bd3c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/91dc753476aa7... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/ffeb83a388fbf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/396e765bf7a1d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/578727faa69c5... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/1398b93f1f427... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/bd19863611993... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://boot-img.xuexi.cn/lego/image/2248_5uM2qXBT... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/b332909e88575... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://boot-img.xuexi.cn/lego/image/7102_MA0TBhlx... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://boot-img.xuexi.cn/lego/image/1584_qiangjun... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://boot-img.xuexi.cn/lego/image/6124_51d54adb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/0458c43bba70d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bootcdn.xuexi.cn/18600410326/c54fab0943876... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
199 images 20.4 MB
0 oversized -0 KB
57 legacy format
24 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
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
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
1 fonts (1 KB)
PASS
1 fonts (1 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

1 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s FCP 5.0 s LCP 49.0 sdata:font/woff;base64,d09GRk9UVE8AAAVkAAsAAAAAB1wAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAABDRkYgAAABCAAAAi4AA…woff;base64,d09GRk9UVE8... data:font/woff;base64,d09GRk9UVE8AAAVkAAsAAAAAB1wAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAABDRkYgAAABCAAAAi4AA… — 1.3 KiB — 350 ms — font-display: swap
woff;base64,d09GRk9UVE8... woff swap
Size 1 KB
Load time 350 ms
Start 6.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
1
prefetch
—

1 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
237 requests over 12394ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s FCP 5.0 s LCP 49.0 shttps://xuexi.cn// https://xuexi.cn/ — 302 — 150 B — 1.2 s — h2https://www.xuexi.cn/index.htmlwww.xuexi.cn/index.html https://www.xuexi.cn/index.html — 200 — 8.6 KiB — 1.2 s — http/1.1https://retcode.alicdn.com/retcode/bl.jsretcode.alicdn.com/retcode/bl.js https://retcode.alicdn.com/retcode/bl.js — 200 — 14.7 KiB — 390 ms — h2https://long-term-cache.xuexi.cn/common/itrace-sdk-117.jslong-term-cache.xuexi.cn/common/itr... https://long-term-cache.xuexi.cn/common/itrace-sdk-117.js — 200 — 17.5 KiB — 1.4 s — h2https://www.xuexi.cn/lgpage/common/base.cced4e.csswww.xuexi.cn/lgpage/common/base.cce... https://www.xuexi.cn/lgpage/common/base.cced4e.css — 200 — 6.3 KiB — 326 ms — http/1.1https://www.xuexi.cn/lgpage/common/vendor.cced4e.jswww.xuexi.cn/lgpage/common/vendor.c... https://www.xuexi.cn/lgpage/common/vendor.cced4e.js — 200 — 535.4 KiB — 2.1 s — http/1.1https://www.xuexi.cn/lgpage/page/index.entry.ce2ef2.jswww.xuexi.cn/lgpage/page/index.entr... https://www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js — 200 — 573.6 KiB — 2.0 s — http/1.1https://www.xuexi.cn/lgdata/index.json?_st=29614846&js_v=1773653018567www.xuexi.cn/lgdata/index.json?_st=... https://www.xuexi.cn/lgdata/index.json?_st=29614846&js_v=1773653018567 — 200 — 387.9 KiB — 590 ms — http/1.1https://px-itrace.xuexi.cn/api/v1/jconfig?wpk-header=app%3Dc9ea6o13-njqexfe0%26tm%3D1776890808%26ud%3Df6f5258a-a796-4368-b362-c69a729a2c53%26sver%3D1.1.7%26sign%3Dc41e43c828c16c16a6eb1c9c1e68e8cepx-itrace.xuexi.cn/api/v1/jconfig?w... https://px-itrace.xuexi.cn/api/v1/jconfig?wpk-header=app%3Dc9ea6o13-njqexfe0%26tm%3D1776890808%26ud%3Df6f5258a-a796-4368-b362-c69a729a2c53%26sver%3D1.1.7%26sign%3Dc41e43c828c16c16a6eb1c9c1e68e8ce — 200 — 652 B — 1.3 s — http/1.1https://px-itrace.xuexi.cn/api/v1/jssdk/upload?wpk-header=app%3Dc9ea6o13-njqexfe0%26cp%3Dnone%26de%3D4%26seq%3D1776890808292%26tm%3D1776890808%26ud%3Dbc84068e-5900-4c33-b74d-484becf445a3%26ver%3D2026031685548f51c9%26type%3Dflow%26sver%3D1.1.7%26sign%3D9bf8a190ef82c5049df7b199c599c45b&data=%7B%22w_url%22%3A%22https%3A%2F%2Fwww.xuexi.cn%2Findex.html%22%2C%22w_query%22%3A%22%22%2C%22w_ref%22%3A%22%22%2C%22w_title%22%3A%22%E5%AD%A6%E4%B9%A0%E5%BC%BA%E5%9B%BD%22%2C%22ua%22%3A%22Mozilla%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%22%2C%22referrer%22%3A%22%22%2C%22dsp_dpi%22%3A1.75%2C%22dsp_w%22%3A412%2C%22dsp_h%22%3A823%2C%22net%22%3A%22%22%2C%22category%22%3A5%2C%22sampleRate%22%3A1%2C%22w_bid%22%3A%22c9ea6o13-njqexfe0%22%2C%22w_cid%22%3Anull%2C%22w_rel%22%3A%222026031685548f51c9%22%2C%22w_spa%22%3Atrue%2C%22w_tm%22%3A1776890808286%2C%22w_cnt%22%3A1%2C%22uid%22%3A%22bc84068e-5900-4c33-b74d-484becf445a3%22%2C%22type%22%3A%22flow%22%2C%22sdk_ver%22%3A%221.1.7%22%2C%22log_src%22%3A%22jssdk%22%2C%22uc_param%22%3A%22%22%2C%22wid%22%3A%22bc84068e-5900-4c33-b74d-484becf445a3%22%2C%22w_frmid%22%3A%221bbc4955-6689-4632-8f47-32b3f9f86969%22%2C%22w_send_mode%22%3A%22sendbeacon%22%7Dpx-itrace.xuexi.cn/api/v1/jssdk/upl... 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http/1.1https://www.xuexi.cn/lgpage/lgimg/20191029/bg-2.pngwww.xuexi.cn/lgpage/lgimg/20191029/... https://www.xuexi.cn/lgpage/lgimg/20191029/bg-2.png — 200 — 4.7 KiB — 383 ms — http/1.1https://boot-img.xuexi.cn/lego/image/1561_local-section-list/470cd03930924b53b6c3734118e4d824.jpgboot-img.xuexi.cn/lego/image/1561_l... https://boot-img.xuexi.cn/lego/image/1561_local-section-list/470cd03930924b53b6c3734118e4d824.jpg — 200 — 16.3 KiB — 354 ms — http/1.1https://www.xuexi.cn/lgpage/lgimg/20191029/study-big_.pngwww.xuexi.cn/lgpage/lgimg/20191029/... https://www.xuexi.cn/lgpage/lgimg/20191029/study-big_.png — 200 — 5.9 KiB — 402 ms — http/1.1https://www.xuexi.cn/lgpage/lgimg/20191029/book-small.pngwww.xuexi.cn/lgpage/lgimg/20191029/... https://www.xuexi.cn/lgpage/lgimg/20191029/book-small.png — 200 — 3.3 KiB — 367 ms — http/1.1https://px-itrace.xuexi.cn/api/v1/jssdk/upload?wpk-header=app%3Dc9ea6o13-njqexfe0%26cp%3Dnone%26de%3D4%26seq%3D1776890812676%26tm%3D1776890812%26ud%3Dbc84068e-5900-4c33-b74d-484becf445a3%26ver%3D2026031685548f51c9%26type%3Dapi%26sver%3D1.1.7%26sign%3D9bf8a190ef82c5049df7b199c599c45b&data=%7B%22w_url%22%3A%22https%3A%2F%2Fwww.xuexi.cn%2Findex.html%22%2C%22w_query%22%3A%22%22%2C%22w_ref%22%3A%22%22%2C%22w_title%22%3A%22%E5%AD%A6%E4%B9%A0%E5%BC%BA%E5%9B%BD%22%2C%22ua%22%3A%22Mozilla%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%22%2C%22referrer%22%3A%22%22%2C%22dsp_dpi%22%3A1.75%2C%22dsp_w%22%3A412%2C%22dsp_h%22%3A823%2C%22net%22%3A%22%22%2C%22category%22%3A2%2C%22sampleRate%22%3A1%2C%22w_res%22%3A%22https%3A%2F%2Fthemis-oss.xuexi.cn%2Fh5_gray%2Fpc_web.json%22%2C%22w_param%22%3A%22%22%2C%22w_body%22%3A%22%22%2C%22w_method%22%3A%22GET%22%2C%22w_rc%22%3A200%2C%22w_rt%22%3A1301%2C%22w_resp%22%3A%22%22%2C%22msg%22%3A%22%22%2C%22w_type%22%3A16%2C%22w_bid%22%3A%22c9ea6o13-njqexfe0%22%2C%22w_cid%22%3Anull%2C%22w_rel%22%3A%222026031685548f51c9%22%2C%22w_spa%22%3Atrue%2C%22w_tm%22%3A1776890812676%2C%22w_cnt%22%3A1%2C%22uid%22%3A%22bc84068e-5900-4c33-b74d-484becf445a3%22%2C%22type%22%3A%22api%22%2C%22sdk_ver%22%3A%221.1.7%22%2C%22log_src%22%3A%22jssdk%22%2C%22uc_param%22%3A%22%22%2C%22wid%22%3A%22bc84068e-5900-4c33-b74d-484becf445a3%22%2C%22w_frmid%22%3A%221bbc4955-6689-4632-8f47-32b3f9f86969%22%2C%22w_send_mode%22%3A%22sendbeacon%22%7Dpx-itrace.xuexi.cn/api/v1/jssdk/upl... https://px-itrace.xuexi.cn/api/v1/jssdk/upload?wpk-header=app%3Dc9ea6o13-njqexfe0%26cp%3Dnone%26de%3D4%26seq%3D1776890812676%26tm%3D1776890812%26ud%3Dbc84068e-5900-4c33-b74d-484becf445a3%26ver%3D2026031685548f51c9%26type%3Dapi%26sver%3D1.1.7%26sign%3D9bf8a190ef82c5049df7b199c599c45b&data=%7B%22w_url%22%3A%22https%3A%2F%2Fwww.xuexi.cn%2Findex.html%22%2C%22w_query%22%3A%22%22%2C%22w_ref%22%3A%22%22%2C%22w_title%22%3A%22%E5%AD%A6%E4%B9%A0%E5%BC%BA%E5%9B%BD%22%2C%22ua%22%3A%22Mozilla%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%22%2C%22referrer%22%3A%22%22%2C%22dsp_dpi%22%3A1.75%2C%22dsp_w%22%3A412%2C%22dsp_h%22%3A823%2C%22net%22%3A%22%22%2C%22category%22%3A2%2C%22sampleRate%22%3A1%2C%22w_res%22%3A%22https%3A%2F%2Fthemis-oss.xuexi.cn%2Fh5_gray%2Fpc_web.json%22%2C%22w_param%22%3A%22%22%2C%22w_body%22%3A%22%22%2C%22w_method%22%3A%22GET%22%2C%22w_rc%22%3A200%2C%22w_rt%22%3A1301%2C%22w_resp%22%3A%22%22%2C%22msg%22%3A%22%22%2C%22w_type%22%3A16%2C%22w_bid%22%3A%22c9ea6o13-njqexfe0%22%2C%22w_cid%22%3Anull%2C%22w_rel%22%3A%222026031685548f51c9%22%2C%22w_spa%22%3Atrue%2C%22w_tm%22%3A1776890812676%2C%22w_cnt%22%3A1%2C%22uid%22%3A%22bc84068e-5900-4c33-b74d-484becf445a3%22%2C%22type%22%3A%22api%22%2C%22sdk_ver%22%3A%221.1.7%22%2C%22log_src%22%3A%22jssdk%22%2C%22uc_param%22%3A%22%22%2C%22wid%22%3A%22bc84068e-5900-4c33-b74d-484becf445a3%22%2C%22w_frmid%22%3A%221bbc4955-6689-4632-8f47-32b3f9f86969%22%2C%22w_send_mode%22%3A%22sendbeacon%22%7D — 200 — 343 B — 389 ms — http/1.1https://boot-img.xuexi.cn/lego/image/1561_local-section-list/15c612845fde4093875603c019cbe0b8.pngboot-img.xuexi.cn/lego/image/1561_l... https://boot-img.xuexi.cn/lego/image/1561_local-section-list/15c612845fde4093875603c019cbe0b8.png — 200 — 896.0 KiB — 464 ms — http/1.1https://arms-retcode.aliyuncs.com/r.png?t=perf&times=1&page=www.xuexi.cn%2Findex.html&tag=%7B%22isHeadless%22%3Atrue%7D&release=1773653018567&environment=prod&begin=1776890808723&dns=264&tcp=636&ssl=320&ttfb=331&trans=2&dom=1461&res=2281&firstbyte=1230&fpt=1234&tti=2695&ready=2695&load=4976&ct=4g&navtype=Other&fmp=5987&autoSend=true&sr=412x823&vp=981x1958&uid=j2mwCospazmi5mw11u7zmzjcIR9d&sid=mgmzdoI5a9OipFwF1uz8m4Cdvvht&pid=hr5uxr169c%409c7272e8e46233f&_v=1.8.31&pv_id=ICmvCoO2aqbi2FwFjnqFvIaipt5t&sampling=1&z=moaiwnvharms-retcode.aliyuncs.com/r.png?t=p... https://arms-retcode.aliyuncs.com/r.png?t=perf&times=1&page=www.xuexi.cn%2Findex.html&tag=%7B%22isHeadless%22%3Atrue%7D&release=1773653018567&environment=prod&begin=1776890808723&dns=264&tcp=636&ssl=320&ttfb=331&trans=2&dom=1461&res=2281&firstbyte=1230&fpt=1234&tti=2695&ready=2695&load=4976&ct=4g&navtype=Other&fmp=5987&autoSend=true&sr=412x823&vp=981x1958&uid=j2mwCospazmi5mw11u7zmzjcIR9d&sid=mgmzdoI5a9OipFwF1uz8m4Cdvvht&pid=hr5uxr169c%409c7272e8e46233f&_v=1.8.31&pv_id=ICmvCoO2aqbi2FwFjnqFvIaipt5t&sampling=1&z=moaiwnvh — -1 — 0 B — 0 ms — https://boot-img.xuexi.cn/lego/image/1572_stay-with-people-slider/d7e9f372803a4562aa8656c1168c8e91.jpgboot-img.xuexi.cn/lego/image/1572_s... https://boot-img.xuexi.cn/lego/image/1572_stay-with-people-slider/d7e9f372803a4562aa8656c1168c8e91.jpg — 200 — 253.6 KiB — 686 ms — http/1.1https://boot-img.xuexi.cn/lego/image/1572_stay-with-people-slider/6a9891bbd202476ab6fb401b9b350e1f.jpgboot-img.xuexi.cn/lego/image/1572_s... https://boot-img.xuexi.cn/lego/image/1572_stay-with-people-slider/6a9891bbd202476ab6fb401b9b350e1f.jpg — 200 — 199.1 KiB — 334 ms — http/1.1https://boot-img.xuexi.cn/lego/image/1572_stay-with-people-slider/ad62f19b277d43d2a9a8ee06d3b4d04b.jpgboot-img.xuexi.cn/lego/image/1572_s... https://boot-img.xuexi.cn/lego/image/1572_stay-with-people-slider/ad62f19b277d43d2a9a8ee06d3b4d04b.jpg — 200 — 207.4 KiB — 355 ms — http/1.1https://boot-img.xuexi.cn/lego/image/1572_stay-with-people-slider/1599aecd602c4859b4734b1595d322a4.jpgboot-img.xuexi.cn/lego/image/1572_s... https://boot-img.xuexi.cn/lego/image/1572_stay-with-people-slider/1599aecd602c4859b4734b1595d322a4.jpg — 200 — 210.1 KiB — 347 ms — http/1.1https://boot-img.xuexi.cn/lego/image/1572_stay-with-people-slider/87cec11c3ce143c7ad9eef13fbb7b197.jpgboot-img.xuexi.cn/lego/image/1572_s... https://boot-img.xuexi.cn/lego/image/1572_stay-with-people-slider/87cec11c3ce143c7ad9eef13fbb7b197.jpg — 200 — 96.0 KiB — 345 ms — http/1.1
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 19572ms · 1285KB · ¥966/mo
www.xuexi.cn
Other
Costly
Execution 15691ms
Transfer 574 KB
Unused 82%
Monthly Cost ¥774/mo
www.xuexi.cn
Other
Costly
Execution 1882ms
Transfer 9 KB
Monthly Cost ¥93/mo
Unattributable
Other
Costly
Execution 886ms
Transfer 0 KB
Monthly Cost ¥44/mo
www.xuexi.cn
Other
Costly
Execution 459ms
Transfer 535 KB
Unused 70%
Monthly Cost ¥23/mo
long-term-cache.xuexi.cn
Other
Costly
Execution 442ms
Transfer 17 KB
Monthly Cost ¥22/mo
www.xuexi.cn
Other
Optional
Execution 155ms
Transfer 136 KB
Unused 75%
Monthly Cost ¥8/mo
retcode.alicdn.com
Other
Optional
Execution 58ms
Transfer 15 KB
Monthly Cost ¥3/mo

These scripts may cost more than they're worth

  • www.xuexi.cn adds 15691ms and costs ~¥774/month
  • www.xuexi.cn adds 1882ms and costs ~¥93/month
  • Unattributable adds 886ms and costs ~¥44/month
  • www.xuexi.cn adds 459ms and costs ~¥23/month
  • long-term-cache.xuexi.cn adds 442ms and costs ~¥22/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

www.xuexi.cn takes 15691ms 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

82% of www.xuexi.cn's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

www.xuexi.cn takes 1882ms 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 886ms 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.xuexi.cn takes 459ms 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

70% of www.xuexi.cn's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

long-term-cache.xuexi.cn takes 442ms 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

75% of www.xuexi.cn's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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.

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