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https://lazada.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
2
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
58
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
75
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.

4.72 s

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

4.72 s

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

0 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.

6.37 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.

4.72 s

Page Load Progression

1.0 s
2.1 s
3.1 s
4.2 s
5.2 s
6.3 s
7.3 s
8.4 s
Checks
15
9 PASS 2 REVIEW 2 FIX
D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (643.4 KiB of 651.2 KiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
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.

B
JS Bundles
13 scripts, 147 KB unused
REVIEW
13 scripts, 147 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QBXX...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-151...: 63 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://g.alicdn.com/code/lib/jquery/3.5.1/jquery....: 20 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 147 KB
147 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-QBXXWM23CD&cx=c&gtm=4e64k0155 KB64 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-151331967-1117 KB63 KB (54%)✓3rd
https://g.alicdn.com/code/lib/jquery/3.5.1/jquery.min.js31 KB20 KB (68%)✓3rd
https://g.alicdn.com/aes/??tracker/3.0.0/index.js,tracker-plugin-pv/3.0.1/index.js,tracker-plugin-event/3.0.0/index.js,tracker-plugin-perf/3.0.0/index.js10 KB—✓3rd
https://g.alicdn.com/code/lib/twitter-bootstrap/4.3.1/js/bootstrap.min.js16 KB—✓3rd
https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.js5 KB—✓3rd
https://g.alicdn.com/code/lib/popper.js/1.14.7/umd/popper.min.js8 KB—✓3rd
https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/js/base.js3 KB—✓3rd
https://g.alicdn.com/code/lib/lozad.js/1.15.0/lozad.min.js2 KB—✓3rd
https://www.google-analytics.com/analytics.js21 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
651 KB transferred, 31 requests
PASS
651 KB transferred, 31 requests
Info::
Page weighs 1.6 MB (651 KB transferred)
Info::
31 HTTP requests
Info::
Estimated 0.13 g CO2 per page load
651 KB / 2.4 MB budget
651 KB transferred
31 requests
0.13 g CO2 per page load
JavaScript 374.0 KiB 57%
Images 122.7 KiB 19%
Fonts 60.8 KiB 9%
Other 48.1 KiB 7%
CSS 35.8 KiB 6%
HTML 7.6 KiB 1%
Other 1.8 KiB 0%
Other 374 B 0%
0 2.4 MB 4.9 MB
Under budget
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
Image Optimization
8 images, 0 KB saveable
PASS
8 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
8 images 123 KB
0 oversized -0 KB
2 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A+
JS Execution Cost
248ms total JS execution
PASS
248ms total JS execution
Info::
https://lazada.com/en/: 165ms CPU time
Info::
Unattributable: 83ms CPU time
Info::
Third-party scripts: 83ms (33% of total)

Main Thread Breakdown

Script Evaluation 37% Other 33% Style & Layout 16% Script Parsing & Compilation 7% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://lazada.com/en/165ms14ms1ms1st
Unattributable83ms16ms0ms3rd
A+
Font Loading
3 fonts (61 KB)
PASS
3 fonts (61 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

61 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 4.7 s LCP 4.7 shttps://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-semibold-webfont.woff2proximanova-semibold-we... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-semibold-webfont.woff2 — 20.2 KiB — 303 ms — font-display: swaphttps://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-bold-webfont.woff2proximanova-bold-webfon... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-bold-webfont.woff2 — 20.6 KiB — 306 ms — font-display: swaphttps://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-regular-webfont.woff2proximanova-regular-web... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-regular-webfont.woff2 — 20.1 KiB — 604 ms — font-display: swap
proximanova-semibold-we... woff2 swap
Size 20 KB
Load time 303 ms
Start 5.2 s
Risk FOUT — text flashes from fallback to web font
proximanova-bold-webfon... woff2 swap
Size 21 KB
Load time 306 ms
Start 5.2 s
Risk FOUT — text flashes from fallback to web font
proximanova-regular-web... woff2 swap
Size 20 KB
Load time 604 ms
Start 5.2 s
Risk FOUT — text flashes from fallback to web font
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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
31 resources · 651 KB · 147 KB savings available
PASS
31 resources · 651 KB · 147 KB savings available
Info::
Within 1MB page-weight target
Got: 651 KB
Info::
~147 KB of savings available
Warning::
29 third-party resources (99% of weight)
31 resources · 651.2 KiB · 29 third-party Within 1MB page-weight target
JavaScript 65% · 422.1 KiB
Image 19% · 124.7 KiB
Font 9% · 60.8 KiB
CSS 6% · 35.8 KiB
Document 1% · 7.8 KiB

~147.4 KiB of savings available

Remove unused JavaScript: 147.4 KiB
Network Waterfall
31 requests over 6622ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 4.7 s LCP 4.7 shttps://lazada.com// https://lazada.com/ — 302 — 233 B — 1.8 s — h2https://lazada.com/en//en/ https://lazada.com/en/ — 200 — 7.6 KiB — 2.5 s — h2https://www.googletagmanager.com/gtag/js?id=UA-151331967-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-151331967-1 — 200 — 116.7 KiB — 140 ms — h2https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/bootstrap.4.3.1.min.csslazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/bootstrap.4.3.1.min.css — 200 — 24.1 KiB — 878 ms — http/1.1https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.cssg.alicdn.com/code/lib/aos/3.0.0-bet... https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.css — 200 — 3.0 KiB — 548 ms — h2https://g.alicdn.com/code/lib/jquery/3.5.1/jquery.min.jsg.alicdn.com/code/lib/jquery/3.5.1/... https://g.alicdn.com/code/lib/jquery/3.5.1/jquery.min.js — 200 — 30.8 KiB — 546 ms — h2https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/style.20220408.csslazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/style.20220408.css — 200 — 8.8 KiB — 871 ms — http/1.1https://g.alicdn.com/code/lib/lozad.js/1.15.0/lozad.min.jsg.alicdn.com/code/lib/lozad.js/1.15... https://g.alicdn.com/code/lib/lozad.js/1.15.0/lozad.min.js — 200 — 1.7 KiB — 545 ms — h2https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/logo_white.svglazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/logo_white.svg — 200 — 7.4 KiB — 872 ms — http/1.1https://g.alicdn.com/code/lib/popper.js/1.14.7/umd/popper.min.jsg.alicdn.com/code/lib/popper.js/1.1... https://g.alicdn.com/code/lib/popper.js/1.14.7/umd/popper.min.js — 200 — 7.8 KiB — 546 ms — h2https://g.alicdn.com/code/lib/twitter-bootstrap/4.3.1/js/bootstrap.min.jsg.alicdn.com/code/lib/twitter-boots... https://g.alicdn.com/code/lib/twitter-bootstrap/4.3.1/js/bootstrap.min.js — 200 — 15.6 KiB — 4 ms — h2https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.jsg.alicdn.com/code/lib/aos/3.0.0-bet... https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.js — 200 — 5.3 KiB — 3 ms — h2https://g.alicdn.com/aes/??tracker/3.0.0/index.js,tracker-plugin-pv/3.0.1/index.js,tracker-plugin-event/3.0.0/index.js,tracker-plugin-perf/3.0.0/index.jsg.alicdn.com/aes/??tracker/3.0.0/in... https://g.alicdn.com/aes/??tracker/3.0.0/index.js,tracker-plugin-pv/3.0.1/index.js,tracker-plugin-event/3.0.0/index.js,tracker-plugin-perf/3.0.0/index.js — 200 — 10.3 KiB — 23 ms — h3https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/js/base.jslazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/js/base.js — 200 — 3.1 KiB — 528 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-QBXXWM23CD&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-QBXXWM23CD&cx=c&gtm=4e64k0 — 200 — 155.4 KiB — 53 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 80 ms — h2https://g.alicdn.com/alilog/mlog/aplus_int.jsg.alicdn.com/alilog/mlog/aplus_int.... https://g.alicdn.com/alilog/mlog/aplus_int.js — 200 — 6.0 KiB — 4 ms — h3https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-semibold-webfont.woff2lazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-semibold-webfont.woff2 — 200 — 20.2 KiB — 303 ms — http/1.1https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-bold-webfont.woff2lazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-bold-webfont.woff2 — 200 — 20.6 KiB — 306 ms — http/1.1https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-regular-webfont.woff2lazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-regular-webfont.woff2 — 200 — 20.1 KiB — 604 ms — http/1.1https://g.alicdn.com/alilog/??s/8.15.25/plugin/aplus_client.js,aplus_cplugin/0.7.12/toolkit.js,aplus_cplugin/0.7.12/monitor.js,aplus_plugin_lazada/lazadalog.js,s/8.15.25/aplus_int.js,s/8.15.25/plugin/aplus_spmact.js?v=20260108171550g.alicdn.com/alilog/??s/8.15.25/plu... https://g.alicdn.com/alilog/??s/8.15.25/plugin/aplus_client.js,aplus_cplugin/0.7.12/toolkit.js,aplus_cplugin/0.7.12/monitor.js,aplus_plugin_lazada/lazadalog.js,s/8.15.25/aplus_int.js,s/8.15.25/plugin/aplus_spmact.js?v=20260108171550 — 200 — 48.1 KiB — 6 ms — h3https://sg.mmstat.com/eg.js?t=1776891100541sg.mmstat.com/eg.js?t=1776891100541 https://sg.mmstat.com/eg.js?t=1776891100541 — 200 — 330 B — 1.1 s — h2data:image/webp;base64,UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoBAAEAAwA0JaQAA3AA/vuUAAA=data:image/webp;base64,UklGRiQAAABX... data:image/webp;base64,UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoBAAEAAwA0JaQAA3AA/vuUAAA= — 200 — 0 B — 0 ms — datadata:image/webp;base64,UklGRkoAAABXRUJQVlA4WAoAAAAQAAAAAAAAAAAAQUxQSAwAAAABBxAR/Q9ERP8DAABWUDggGAAA…data:image/webp;base64,UklGRkoAAABX... data:image/webp;base64,UklGRkoAAABXRUJQVlA4WAoAAAAQAAAAAAAAAAAAQUxQSAwAAAABBxAR/Q9ERP8DAABWUDggGAAA… — 200 — 0 B — 0 ms — datadata:image/webp;base64,UklGRlIAAABXRUJQVlA4WAoAAAASAAAAAAAAAAAAQU5JTQYAAAD/////AABBTk1GJgAAAAAAAAAA…data:image/webp;base64,UklGRlIAAABX... data:image/webp;base64,UklGRlIAAABXRUJQVlA4WAoAAAASAAAAAAAAAAAAQU5JTQYAAAD/////AABBTk1GJgAAAAAAAAAA… — 200 — 0 B — 0 ms — datadata:image/webp;base64,UklGRh4AAABXRUJQVlA4TBEAAAAvAAAAAAfQ//73v/+BiOh/AAA=data:image/webp;base64,UklGRh4AAABX... data:image/webp;base64,UklGRh4AAABXRUJQVlA4TBEAAAAvAAAAAAfQ//73v/+BiOh/AAA= — 200 — 0 B — 0 ms — datahttps://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/home-hero_x1.webplazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/home-hero_x1.webp — 200 — 114.9 KiB — 597 ms — http/1.1https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/new-lazada-logo-small.pnglazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/new-lazada-logo-small.png — 200 — 1.6 KiB — 291 ms — http/1.1https://sg.mmstat.com/aes.1.1sg.mmstat.com/aes.1.1 https://sg.mmstat.com/aes.1.1 — 200 — 241 B — 264 ms — h2https://sg.mmstat.com/aes.1.1sg.mmstat.com/aes.1.1 https://sg.mmstat.com/aes.1.1 — 200 — 133 B — 264 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 4.7 s LCP 4.7 shttps://lazada.com// https://lazada.com/ — 302 — 233 B — 1.8 s — h2https://lazada.com/en//en/ https://lazada.com/en/ — 200 — 7.6 KiB — 2.5 s — h2https://www.googletagmanager.com/gtag/js?id=UA-151331967-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-151331967-1 — 200 — 116.7 KiB — 140 ms — h2https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/bootstrap.4.3.1.min.csslazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/bootstrap.4.3.1.min.css — 200 — 24.1 KiB — 878 ms — http/1.1https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.cssg.alicdn.com/code/lib/aos/3.0.0-bet... https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.css — 200 — 3.0 KiB — 548 ms — h2https://g.alicdn.com/code/lib/jquery/3.5.1/jquery.min.jsg.alicdn.com/code/lib/jquery/3.5.1/... https://g.alicdn.com/code/lib/jquery/3.5.1/jquery.min.js — 200 — 30.8 KiB — 546 ms — h2https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/style.20220408.csslazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/style.20220408.css — 200 — 8.8 KiB — 871 ms — http/1.1https://g.alicdn.com/code/lib/lozad.js/1.15.0/lozad.min.jsg.alicdn.com/code/lib/lozad.js/1.15... https://g.alicdn.com/code/lib/lozad.js/1.15.0/lozad.min.js — 200 — 1.7 KiB — 545 ms — h2https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/logo_white.svglazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/logo_white.svg — 200 — 7.4 KiB — 872 ms — http/1.1https://g.alicdn.com/code/lib/popper.js/1.14.7/umd/popper.min.jsg.alicdn.com/code/lib/popper.js/1.1... https://g.alicdn.com/code/lib/popper.js/1.14.7/umd/popper.min.js — 200 — 7.8 KiB — 546 ms — h2https://g.alicdn.com/code/lib/twitter-bootstrap/4.3.1/js/bootstrap.min.jsg.alicdn.com/code/lib/twitter-boots... https://g.alicdn.com/code/lib/twitter-bootstrap/4.3.1/js/bootstrap.min.js — 200 — 15.6 KiB — 4 ms — h2https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.jsg.alicdn.com/code/lib/aos/3.0.0-bet... https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.js — 200 — 5.3 KiB — 3 ms — h2https://g.alicdn.com/aes/??tracker/3.0.0/index.js,tracker-plugin-pv/3.0.1/index.js,tracker-plugin-event/3.0.0/index.js,tracker-plugin-perf/3.0.0/index.jsg.alicdn.com/aes/??tracker/3.0.0/in... https://g.alicdn.com/aes/??tracker/3.0.0/index.js,tracker-plugin-pv/3.0.1/index.js,tracker-plugin-event/3.0.0/index.js,tracker-plugin-perf/3.0.0/index.js — 200 — 10.3 KiB — 23 ms — h3https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/js/base.jslazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/js/base.js — 200 — 3.1 KiB — 528 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-QBXXWM23CD&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
33% of JavaScript execution is third-party
First-party Third-party 83ms · 0KB · ¥4/mo
Unattributable
Other
Optional
Execution 83ms
Transfer 0 KB
Monthly Cost ¥4/mo

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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