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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
1
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
95
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
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.
85
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.

938 ms

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

1.31 s

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

16 ms

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

0.001

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

1.22 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.

1.43 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
8 PASS 4 REVIEW 1 FIX
F
Page Weight Budget
Action
2.8 MB transferred, 73 requests
FIX
2.8 MB transferred, 73 requests
Warning::
Page weighs 5.4 MB (2.8 MB transferred)
Warning::
Images are 2.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.0 MB
Warning::
JavaScript is 585 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 585 KB
Info::
73 HTTP requests
Info::
Estimated 0.58 g CO2 per page load
2.8 MB / 2.4 MB budget
2.8 MB transferred
73 requests
0.58 g CO2 per page load
Images 2.0 MiB 71%
JavaScript 584.6 KiB 20%
Fonts 129.5 KiB 5%
Other 57.1 KiB 2%
CSS 30.1 KiB 1%
HTML 11.3 KiB 0%
Other 1.9 KiB 0%
Other 1.6 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

B
Image Optimization
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
Warning::
https://opensource.com/themes/osdc/logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
34 images 2.0 MB
0 oversized -0 KB
32 legacy format
1 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

B
JS Bundles
21 scripts, 79 KB unused
REVIEW
21 scripts, 79 KB unused
Warning::
https://opensource.com/sites/default/files/js/js_q...: 46 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.redhat.com/ma/dpal.js: 33 KB unused (15%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 79 KB
79 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://opensource.com/sites/default/files/js/js_qgp1hJtRopt0_BeP4SC5ao8KRG5al8MAxKSuQPvkAEA.js?scope=footer&delta=0&language=en&theme=osdc&include=eJxNjtEOwjAIRX-oXT-pYRQ3JitNS-bm10s0Rh9ITg73EgoYCFzU807mvCRsZ-7UtJtL1L1ppWqhr86Fjlw8ld-VhFrNd5GN9ojCeKcSdBRMi-gMEg6mx8hcb1w9kwd2FUlvG782fuynB90YhaIRDOphFnheaWadYIMzoBYalVsjS388rbys4mPb-P0JFeTyayOVBvIC0tdbeA68 KB46 KB (67%)✓1st
https://www.redhat.com/ma/dpal.js225 KB33 KB (15%)✓3rd
https://consent.trustarc.com/notice?c=teconsent&domain=redhat2.com&gtm=1&js=nj&noticeType=bb&privacypolicylink=https%3A%2F%2Fwww.redhat.com%2Fen%2Fabout%2Fprivacy-policy&text=true7 KB—✓3rd
https://consent.trustarc.com/asset/notice.js/v/v1.7-172936 KB—✓3rd
https://opensource.com/themes/osdc/node_modules/%40patternfly/pfe-avatar/dist/pfe-avatar.min.js?sqka6y3 KB—✓1st
https://opensource.com/libraries/chapeaux--cpx-reporter/reporter.js2 KB—✓1st
https://opensource.com/sites/default/files/js/js_Vs1jklihE74Lmh50K_QZN26KPvA_Q49pCnF9Sshashw.js?scope=footer&delta=2&language=en&theme=osdc&include=eJxNjtEOwjAIRX-oXT-pYRQ3JitNS-bm10s0Rh9ITg73EgoYCFzU807mvCRsZ-7UtJtL1L1ppWqhr86Fjlw8ld-VhFrNd5GN9ojCeKcSdBRMi-gMEg6mx8hcb1w9kwd2FUlvG782fuynB90YhaIRDOphFnheaWadYIMzoBYalVsjS388rbys4mPb-P0JFeTyayOVBvIC0tdbeA36 KB—✓1st
https://static.redhat.com/libs/redhat/marketing/latest/trustarc/trustarc.js2 KB—✓3rd
https://opensource.com/themes/osdc/node_modules/@patternfly/pfelement/dist/pfelement.min.js5 KB—✓1st
https://opensource.com/themes/osdc/node_modules/%40patternfly/pfelement/dist/pfelement.min.js5 KB—✓1st

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
Page Weight Inventory
Action
73 resources · 2.8 MB · 79 KB savings available
REVIEW
73 resources · 2.8 MB · 79 KB savings available
Warning::
Page weight 1.8 MB over 1MB target
Got: 2.8 MB Expected: ≤ 1 MB
Info::
~79 KB of savings available
Info::
28 third-party resources (22% of weight)
Info::
2 resources over 200KB
73 resources · 2.8 MiB · 28 third-party 1.8 MiB over 1MB target
Image 71% · 2.0 MiB
JavaScript 20% · 584.6 KiB
Font 5% · 129.5 KiB
Other 2% · 59.7 KiB
CSS 1% · 30.1 KiB
Document 0% · 11.3 KiB

~79.0 KiB of savings available

Remove unused JavaScript: 79.0 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Third-Party Impact
22% third-party, 0 ms blocking
PASS
22% third-party, 0 ms blocking
Info::
Third-party code accounts for 22% of page weight (620.8 KiB of 2.8 MiB)
Info::
Third-party blocking time is low (0 ms)
78%
22%
First-party Third-party
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+
JS Execution Cost
475ms total JS execution
PASS
475ms total JS execution
Info::
Unattributable: 216ms CPU time
Info::
https://www.redhat.com/ma/dpal.js: 109ms CPU time
Info::
https://opensource.com/: 98ms CPU time
Info::
https://consent.trustarc.com/notice?c=teconsent&do...: 52ms CPU time
Warning::
Third-party scripts: 377ms (79% of total)

Main Thread Breakdown

Other 40% Script Evaluation 31% Style & Layout 13% Script Parsing & Compilation 8% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable216ms7ms0ms3rd
https://www.redhat.com/ma/dpal.js109ms62ms37ms3rd
https://opensource.com/98ms0ms0ms1st
https://consent.trustarc.com/notice?c=teconsent&domain=redhat2.com&gtm=1&js=nj&noticeType=bb&privacypolicylink=https%3A%2F%2Fwww.redhat.com%2Fen%2Fabout%2Fprivacy-policy&text=true52ms36ms0ms3rd
A+
Font Loading
5 fonts (129 KB)
PASS
5 fonts (129 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

129 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 938 ms LCP 1.3 shttps://fonts.gstatic.com/s/redhattext/v19/RrQXbohi_ic6B3yVSzGBrMxQaKctMc-JPQ.woff2RrQXbohi_ic6B3yVSzGBrMx... https://fonts.gstatic.com/s/redhattext/v19/RrQXbohi_ic6B3yVSzGBrMxQaKctMc-JPQ.woff2 — 29.5 KiB — 38 ms — font-display: swaphttps://opensource.com/themes/osdc/assets/font/fontawesome-webfont.woff?v=3.2.1fontawesome-webfont.woff https://opensource.com/themes/osdc/assets/font/fontawesome-webfont.woff?v=3.2.1 — 43.1 KiB — 41 ms — font-display: swaphttps://consent.trustarc.com/get?name=RedHatDisplay-Medium_new.woff2get https://consent.trustarc.com/get?name=RedHatDisplay-Medium_new.woff2 — 19.2 KiB — 54 ms — font-display: swaphttps://consent.trustarc.com/get?name=RedHatText-Regular_new.woff2get https://consent.trustarc.com/get?name=RedHatText-Regular_new.woff2 — 18.4 KiB — 66 ms — font-display: swaphttps://consent.trustarc.com/get?name=RedHatDisplay-Bold_new.woff2get https://consent.trustarc.com/get?name=RedHatDisplay-Bold_new.woff2 — 19.3 KiB — 69 ms — font-display: swap
RrQXbohi_ic6B3yVSzGBrMx... woff2 swap
Size 29 KB
Load time 38 ms
Start 540 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff unknown swap
Size 43 KB
Load time 41 ms
Start 541 ms
Risk FOUT — text flashes from fallback to web font
get woff2 swap
Size 19 KB
Load time 54 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
get woff2 swap
Size 18 KB
Load time 66 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
get woff2 swap
Size 19 KB
Load time 69 ms
Start 1.2 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)

Fixing the unchecked items could save ~13 KB and ~26 ms

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+
HTTP Caching
max-age=30 (30 seconds)
PASS
max-age=30 (30 seconds)
Info::
Cache-Control header is set
Got: max-age=30
Info::
Effective TTL: 30 seconds (max-age=30)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=30

DirectiveValueMeaning
max-age30Cache for 30 seconds
Effective TTL: 30 seconds
Network Waterfall
73 requests over 1224ms
INFO
0 ms 500 ms 1.0 s FCP 938 ms LCP 1.3 shttps://opensource.com// https://opensource.com/ — 200 — 9.2 KiB — 136 ms — h2https://opensource.com/sites/default/files/css/css_NQ1nxvlxNeOjyo7GJF6jU-bX8uHtHobv8PV-CHf26EM.css?delta=0&language=en&theme=osdc&include=eJxVjkEOgzAMBD9kyJMqx7FoihMjO9CG1xcBPfSyWmml2VlUJCRbF5RxOfoguc4O3r1xCRGdgQTd-18v7I4TO5Aah6pWUPLOoJ4oTKIRBQS7ru2RspNubD1oZVKBLfPbw5lj0bQKX5RbAl_4uThoLZPw0Ph4NoiC-21xztRwiKI0_6SqpntyRqPnF1GgU_Y/sites/default/files/css/css_NQ1nxv... https://opensource.com/sites/default/files/css/css_NQ1nxvlxNeOjyo7GJF6jU-bX8uHtHobv8PV-CHf26EM.css?delta=0&language=en&theme=osdc&include=eJxVjkEOgzAMBD9kyJMqx7FoihMjO9CG1xcBPfSyWmml2VlUJCRbF5RxOfoguc4O3r1xCRGdgQTd-18v7I4TO5Aah6pWUPLOoJ4oTKIRBQS7ru2RspNubD1oZVKBLfPbw5lj0bQKX5RbAl_4uThoLZPw0Ph4NoiC-21xztRwiKI0_6SqpntyRqPnF1GgU_Y — 200 — 2.6 KiB — 39 ms — h2https://opensource.com/sites/default/files/css/css_OxBWfCNbQ0DfjsXj7OrV5J5bVQ9sXQvcpEDcyMq1-js.css?delta=1&language=en&theme=osdc&include=eJxVjkEOgzAMBD9kyJMqx7FoihMjO9CG1xcBPfSyWmml2VlUJCRbF5RxOfoguc4O3r1xCRGdgQTd-18v7I4TO5Aah6pWUPLOoJ4oTKIRBQS7ru2RspNubD1oZVKBLfPbw5lj0bQKX5RbAl_4uThoLZPw0Ph4NoiC-21xztRwiKI0_6SqpntyRqPnF1GgU_Y/sites/default/files/css/css_OxBWfC... https://opensource.com/sites/default/files/css/css_OxBWfCNbQ0DfjsXj7OrV5J5bVQ9sXQvcpEDcyMq1-js.css?delta=1&language=en&theme=osdc&include=eJxVjkEOgzAMBD9kyJMqx7FoihMjO9CG1xcBPfSyWmml2VlUJCRbF5RxOfoguc4O3r1xCRGdgQTd-18v7I4TO5Aah6pWUPLOoJ4oTKIRBQS7ru2RspNubD1oZVKBLfPbw5lj0bQKX5RbAl_4uThoLZPw0Ph4NoiC-21xztRwiKI0_6SqpntyRqPnF1GgU_Y — 200 — 16.2 KiB — 49 ms — h2https://fonts.googleapis.com/css2?family=Red+Hat+Text:wght@400;500;700&display=swapfonts.googleapis.com/css2?family=Re... https://fonts.googleapis.com/css2?family=Red+Hat+Text:wght@400;500;700&display=swap — 200 — 910 B — 122 ms — h2https://fonts.googleapis.com/css2?family=Red+Hat+Mono:wght@400;500;700&display=swapfonts.googleapis.com/css2?family=Re... https://fonts.googleapis.com/css2?family=Red+Hat+Mono:wght@400;500;700&display=swap — 200 — 514 B — 124 ms — h2https://opensource.com/sites/default/files/css/css_Giv0116jI53KYODyGfii-R0CZP4oLRijotD4QrdM7fo.css?delta=4&language=en&theme=osdc&include=eJxVjkEOgzAMBD9kyJMqx7FoihMjO9CG1xcBPfSyWmml2VlUJCRbF5RxOfoguc4O3r1xCRGdgQTd-18v7I4TO5Aah6pWUPLOoJ4oTKIRBQS7ru2RspNubD1oZVKBLfPbw5lj0bQKX5RbAl_4uThoLZPw0Ph4NoiC-21xztRwiKI0_6SqpntyRqPnF1GgU_Y/sites/default/files/css/css_Giv011... https://opensource.com/sites/default/files/css/css_Giv0116jI53KYODyGfii-R0CZP4oLRijotD4QrdM7fo.css?delta=4&language=en&theme=osdc&include=eJxVjkEOgzAMBD9kyJMqx7FoihMjO9CG1xcBPfSyWmml2VlUJCRbF5RxOfoguc4O3r1xCRGdgQTd-18v7I4TO5Aah6pWUPLOoJ4oTKIRBQS7ru2RspNubD1oZVKBLfPbw5lj0bQKX5RbAl_4uThoLZPw0Ph4NoiC-21xztRwiKI0_6SqpntyRqPnF1GgU_Y — 200 — 2.4 KiB — 50 ms — h2https://opensource.com/libraries/chapeaux--cpx-reporter/cpx-reporter.js?v=0.12.0/libraries/chapeaux--cpx-reporter/c... https://opensource.com/libraries/chapeaux--cpx-reporter/cpx-reporter.js?v=0.12.0 — 200 — 1.5 KiB — 52 ms — h2https://www.redhat.com/ma/dpal.jswww.redhat.com/ma/dpal.js https://www.redhat.com/ma/dpal.js — 200 — 225.4 KiB — 192 ms — h2https://opensource.com/themes/osdc/node_modules/@patternfly/pfe-modal/dist/pfe-modal.min.js/themes/osdc/node_modules/@patternf... https://opensource.com/themes/osdc/node_modules/@patternfly/pfe-modal/dist/pfe-modal.min.js — 200 — 4.2 KiB — 54 ms — h2https://opensource.com/themes/osdc/logo.svg/themes/osdc/logo.svg https://opensource.com/themes/osdc/logo.svg — 200 — 1.9 KiB — 57 ms — h2https://opensource.com/sites/default/files/js/js_qgp1hJtRopt0_BeP4SC5ao8KRG5al8MAxKSuQPvkAEA.js?scope=footer&delta=0&language=en&theme=osdc&include=eJxNjtEOwjAIRX-oXT-pYRQ3JitNS-bm10s0Rh9ITg73EgoYCFzU807mvCRsZ-7UtJtL1L1ppWqhr86Fjlw8ld-VhFrNd5GN9ojCeKcSdBRMi-gMEg6mx8hcb1w9kwd2FUlvG782fuynB90YhaIRDOphFnheaWadYIMzoBYalVsjS388rbys4mPb-P0JFeTyayOVBvIC0tdbeA/sites/default/files/js/js_qgp1hJtR... https://opensource.com/sites/default/files/js/js_qgp1hJtRopt0_BeP4SC5ao8KRG5al8MAxKSuQPvkAEA.js?scope=footer&delta=0&language=en&theme=osdc&include=eJxNjtEOwjAIRX-oXT-pYRQ3JitNS-bm10s0Rh9ITg73EgoYCFzU807mvCRsZ-7UtJtL1L1ppWqhr86Fjlw8ld-VhFrNd5GN9ojCeKcSdBRMi-gMEg6mx8hcb1w9kwd2FUlvG782fuynB90YhaIRDOphFnheaWadYIMzoBYalVsjS388rbys4mPb-P0JFeTyayOVBvIC0tdbeA — 200 — 68.5 KiB — 104 ms — h2https://opensource.com/themes/osdc/node_modules/%40patternfly/pfe-avatar/dist/pfe-avatar.min.js?sqka6y/themes/osdc/node_modules/%40patter... https://opensource.com/themes/osdc/node_modules/%40patternfly/pfe-avatar/dist/pfe-avatar.min.js?sqka6y — 200 — 3.5 KiB — 55 ms — h2https://opensource.com/libraries/chapeaux--cpx-reporter/reporter.js/libraries/chapeaux--cpx-reporter/r... https://opensource.com/libraries/chapeaux--cpx-reporter/reporter.js — 200 — 1.9 KiB — 44 ms — h2https://opensource.com/sites/default/files/js/js_Vs1jklihE74Lmh50K_QZN26KPvA_Q49pCnF9Sshashw.js?scope=footer&delta=2&language=en&theme=osdc&include=eJxNjtEOwjAIRX-oXT-pYRQ3JitNS-bm10s0Rh9ITg73EgoYCFzU807mvCRsZ-7UtJtL1L1ppWqhr86Fjlw8ld-VhFrNd5GN9ojCeKcSdBRMi-gMEg6mx8hcb1w9kwd2FUlvG782fuynB90YhaIRDOphFnheaWadYIMzoBYalVsjS388rbys4mPb-P0JFeTyayOVBvIC0tdbeA/sites/default/files/js/js_Vs1jklih... https://opensource.com/sites/default/files/js/js_Vs1jklihE74Lmh50K_QZN26KPvA_Q49pCnF9Sshashw.js?scope=footer&delta=2&language=en&theme=osdc&include=eJxNjtEOwjAIRX-oXT-pYRQ3JitNS-bm10s0Rh9ITg73EgoYCFzU807mvCRsZ-7UtJtL1L1ppWqhr86Fjlw8ld-VhFrNd5GN9ojCeKcSdBRMi-gMEg6mx8hcb1w9kwd2FUlvG782fuynB90YhaIRDOphFnheaWadYIMzoBYalVsjS388rbys4mPb-P0JFeTyayOVBvIC0tdbeA — 200 — 36.4 KiB — 49 ms — h2https://static.redhat.com/libs/redhat/marketing/latest/trustarc/trustarc.jsstatic.redhat.com/libs/redhat/marke... https://static.redhat.com/libs/redhat/marketing/latest/trustarc/trustarc.js — 200 — 2.5 KiB — 70 ms — h2https://opensource.com/themes/osdc/assets/img/l_supported-by-redhat-white.svg/themes/osdc/assets/img/l_supported... https://opensource.com/themes/osdc/assets/img/l_supported-by-redhat-white.svg — 200 — 4.8 KiB — 33 ms — h2https://opensource.com/themes/osdc/assets/img/icon-rss.svg/themes/osdc/assets/img/icon-rss.sv... https://opensource.com/themes/osdc/assets/img/icon-rss.svg — 200 — 802 B — 35 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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
79% of JavaScript execution is third-party
First-party Third-party 377ms · 232KB · $5/mo
Unattributable
Other
Costly
Execution 216ms
Transfer 0 KB
Monthly Cost $3/mo
www.redhat.com
Other
Optional
Execution 109ms
Transfer 225 KB
Unused 15%
Monthly Cost $1/mo
consent.trustarc.com
Other
Optional
Execution 52ms
Transfer 7 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 216ms and costs ~$3/month

79% 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 216ms 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.

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