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Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
2
REVIEW
6
PASS
11
INFO
3

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

Mobile Desktop
71
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.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

725 ms

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

4.71 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.

0.001

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

2.64 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.

4.85 s

Page Load Progression

992 ms
2.0 s
3.0 s
4.0 s
5.0 s
6.0 s
6.9 s
7.9 s
Checks
22
11 PASS 6 REVIEW 2 FIX
F
Page Weight Budget
Action
7.9 MB transferred, 78 requests
FIX
7.9 MB transferred, 78 requests
Critical::
Page weighs 13.6 MB (7.9 MB transferred)
Warning::
Images are 5.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.5 MB
Info::
Fonts are 1.1 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.1 MB
Info::
78 HTTP requests
Info::
Estimated 1.7 g CO2 per page load
7.9 MB / 2.4 MB budget
7.9 MB transferred
78 requests
1.7 g CO2 per page load
Images 5.5 MiB 69%
Other 1.1 MiB 14%
Fonts 1.1 MiB 13%
CSS 146.7 KiB 2%
JavaScript 124.2 KiB 2%
HTML 21.9 KiB 0%
Other 3.7 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
JS Execution Cost
Action
3169ms total JS execution
FIX
3169ms total JS execution
Warning::
https://developer.apple.com/: 1457ms CPU time
Warning::
https://developer.apple.com/assets/scripts/media-c...: 1336ms CPU time
Warning::
Unattributable: 376ms CPU time

Main Thread Breakdown

Style & Layout 41% Other 33% Script Evaluation 12% Rendering 11%
ScriptTotalScriptingParse/CompileParty
https://developer.apple.com/1457ms21ms1ms1st
https://developer.apple.com/assets/scripts/media-card-infinite.js?21336ms322ms0ms1st
Unattributable376ms3ms0ms1st
C
Image Optimization
Action
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Warning::
https://devimages-cdn.apple.com/wwdc-services/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://devimages-cdn.apple.com/wwdc-services/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://developer.apple.com/home/images/tile-macos... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://developer.apple.com/home/images/tile-tvos-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://devimages-cdn.apple.com/wwdc-services/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://devimages-cdn.apple.com/wwdc-services/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://developer.apple.com/home/images/tile-ipado... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://developer.apple.com/home/images/tile-visio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://devimages-cdn.apple.com/wwdc-services/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://devimages-cdn.apple.com/wwdc-services/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://devimages-cdn.apple.com/wwdc-services/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://devimages-cdn.apple.com/wwdc-services/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://developer.apple.com/assets/elements/icons/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://devimages-cdn.apple.com/wwdc-services/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://devimages-cdn.apple.com/wwdc-services/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://devimages-cdn.apple.com/wwdc-services/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
27 images 5.5 MB
0 oversized -0 KB
21 legacy format
16 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

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Compression Algorithm
Main response uses gzip; brotli would be ~20% smaller
REVIEW
Main response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
C
Page Weight Inventory
Action
78 resources · 7.9 MB · 22 KB savings available
REVIEW
78 resources · 7.9 MB · 22 KB savings available
Warning::
Page weight 7.9 MB exceeds 1 MB target by 6.9 MB
Got: 7.9 MB Expected: ≤ 1 MB
Info::
25 third-party resources (29% of weight)
Info::
10 resources over 200KB
78 resources · 7.9 MiB · 25 third-party 6.9 MiB over 1MB target
Image 69% · 5.5 MiB
Other 14% · 1.1 MiB
Font 13% · 1.1 MiB
CSS 2% · 146.7 KiB
JavaScript 2% · 124.2 KiB
Document 0% · 21.9 KiB

~21.8 KiB of savings available

Remove unused JavaScript: 21.8 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
29% third-party, 0 ms blocking
PASS
29% third-party, 0 ms blocking
Info::
Third-party code accounts for 29% of page weight (2.3 MiB of 7.9 MiB)
Info::
Third-party blocking time is low (0 ms)
71%
29%
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+
Font Loading
8 fonts (1077 KB)
PASS
8 fonts (1077 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

1077 KB total

Render-blocking

0

of 8

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 FCP 725 ms LCP 4.7 shttps://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_regular.woff2sf-pro-text_regular.woff2 https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_regular.woff2 — 216.6 KiB — 26 ms — font-display: swaphttps://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_semibold.woff2sf-pro-display_semibold... https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_semibold.woff2 — 127.7 KiB — 54 ms — font-display: swaphttps://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_semibold.woff2sf-pro-text_semibold.woff2 https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_semibold.woff2 — 230.0 KiB — 33 ms — font-display: swaphttps://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_bold.woff2sf-pro-display_bold.woff2 https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_bold.woff2 — 126.2 KiB — 11 ms — font-display: swaphttps://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_regular.woff2sf-pro-display_regular.... https://www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_regular.woff2 — 115.5 KiB — 11 ms — font-display: swaphttps://www.apple.com/wss/fonts/SF-Pro-Icons/v3/sf-pro-icons_regular.woff2sf-pro-icons_regular.woff2 https://www.apple.com/wss/fonts/SF-Pro-Icons/v3/sf-pro-icons_regular.woff2 — 15.0 KiB — 9 ms — font-display: swaphttps://www.apple.com/wss/fonts/SF-Pro-Icons/v3/sf-pro-icons_semibold.woff2sf-pro-icons_semibold.w... https://www.apple.com/wss/fonts/SF-Pro-Icons/v3/sf-pro-icons_semibold.woff2 — 15.4 KiB — 9 ms — font-display: swaphttps://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_medium.woff2sf-pro-text_medium.woff2 https://www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_medium.woff2 — 230.4 KiB — 14 ms — font-display: swap
sf-pro-text_regular.woff2 woff2 swap
Size 217 KB
Load time 26 ms
Start 310 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
sf-pro-display_semibold... woff2 swap
Size 128 KB
Load time 54 ms
Start 310 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
sf-pro-text_semibold.woff2 woff2 swap
Size 230 KB
Load time 33 ms
Start 311 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
sf-pro-display_bold.woff2 woff2 swap
Size 126 KB
Load time 11 ms
Start 421 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
sf-pro-display_regular.... woff2 swap
Size 116 KB
Load time 11 ms
Start 421 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
sf-pro-icons_regular.woff2 woff2 swap
Size 15 KB
Load time 9 ms
Start 544 ms
Risk FOUT — text flashes from fallback to web font
sf-pro-icons_semibold.w... woff2 swap
Size 15 KB
Load time 9 ms
Start 544 ms
Risk FOUT — text flashes from fallback to web font
sf-pro-text_medium.woff2 woff2 swap
Size 230 KB
Load time 14 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~523 KB and ~1046 ms

A+
JS Bundles
20 scripts, 22 KB unused
PASS
20 scripts, 22 KB unused
Warning::
https://developer.apple.com/assets/scripts/lib/jqu...: 22 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 22 KB
22 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://developer.apple.com/assets/scripts/lib/jquery/jquery-3.6.0.min.js?3521262114832 KB22 KB (72%)✓1st
https://developer.apple.com/assets/scripts/settings.js?352126211482 KB—✓1st
https://developer.apple.com/assets/scripts/language-locales.js?502226382032 KB—✓1st
https://developer.apple.com/assets/scripts/DeveloperBreadcrumbs.js?352126211483 KB—✓1st
https://developer.apple.com/assets/metrics/scripts/analytics-module.js?352126211483 KB—✓1st
https://developer.apple.com/assets/scripts/global-logout.js?352126211482 KB—✓1st
https://developer.apple.com/assets/includes/global-session-nav/session.js8 KB—✗1st
https://developer.apple.com/assets/scripts/media-card-infinite.js?26 KB—✓1st
https://developer.apple.com/assets/scripts/suggest-lang.js?502226382033 KB—✓1st
https://developer.apple.com/assets/scripts/ac-globalnav.built.js?352126211484 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

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+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML max-age=60 (≤ 5min) is appropriate
PASS
Main HTML max-age=60 (≤ 5min) is appropriate
Info::
Main HTML max-age=60 (≤ 5min) is appropriate
Got: max-age=60, public
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A
HTTP Caching
max-age=60 (1 minute)
PASS
max-age=60 (1 minute)
Info::
Cache-Control header is set
Got: max-age=60, public
Info::
Effective TTL: 1 minute (max-age=60)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=60, public

DirectiveValueMeaning
max-age60Cache for 1 minute
public—Any cache may store this response
Effective TTL: 60 seconds
Network Waterfall
78 requests over 1366ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 725 ms LCP 4.7 shttps://developer.apple.com// https://developer.apple.com/ — 200 — 21.9 KiB — 38 ms — http/1.1https://developer.apple.com/assets/styles/global.dist.css?19212626191/assets/styles/global.dist.css?1921... https://developer.apple.com/assets/styles/global.dist.css?19212626191 — 200 — 83.4 KiB — 31 ms — http/1.1https://developer.apple.com/assets/styles/localization.css?34212621148/assets/styles/localization.css?342... https://developer.apple.com/assets/styles/localization.css?34212621148 — 200 — 2.7 KiB — 24 ms — http/1.1https://developer.apple.com/assets/scripts/lib/jquery/jquery-3.6.0.min.js?35212621148/assets/scripts/lib/jquery/jquery-3... https://developer.apple.com/assets/scripts/lib/jquery/jquery-3.6.0.min.js?35212621148 — 200 — 31.6 KiB — 183 ms — http/1.1https://developer.apple.com/assets/scripts/settings.js?35212621148/assets/scripts/settings.js?3521262... https://developer.apple.com/assets/scripts/settings.js?35212621148 — 200 — 2.1 KiB — 36 ms — http/1.1https://developer.apple.com/assets/scripts/language-locales.js?50222638203/assets/scripts/language-locales.js... https://developer.apple.com/assets/scripts/language-locales.js?50222638203 — 200 — 1.9 KiB — 37 ms — http/1.1https://developer.apple.com/assets/scripts/DeveloperBreadcrumbs.js?35212621148/assets/scripts/DeveloperBreadcrumb... https://developer.apple.com/assets/scripts/DeveloperBreadcrumbs.js?35212621148 — 200 — 2.5 KiB — 37 ms — http/1.1https://developer.apple.com/assets/metrics/scripts/analytics-module.js?35212621148/assets/metrics/scripts/analytics-m... https://developer.apple.com/assets/metrics/scripts/analytics-module.js?35212621148 — 200 — 2.8 KiB — 42 ms — http/1.1https://developer.apple.com/assets/scripts/global-logout.js?35212621148/assets/scripts/global-logout.js?35... https://developer.apple.com/assets/scripts/global-logout.js?35212621148 — 200 — 2.2 KiB — 48 ms — http/1.1https://developer.apple.com/assets/includes/global-session-nav/session.css/assets/includes/global-session-nav... https://developer.apple.com/assets/includes/global-session-nav/session.css — 200 — 3.4 KiB — 22 ms — http/1.1https://developer.apple.com/assets/includes/global-session-nav/session.js/assets/includes/global-session-nav... https://developer.apple.com/assets/includes/global-session-nav/session.js — 200 — 8.0 KiB — 44 ms — http/1.1https://www.apple.com/wss/fonts?families=SF+Pro,v3|SF+Pro+Icons,v3www.apple.com/wss/fonts?families=SF... https://www.apple.com/wss/fonts?families=SF+Pro,v3|SF+Pro+Icons,v3 — 200 — 2.1 KiB — 41 ms — http/1.1https://www.apple.com/wss/fonts?family=SF+Mono&v=2www.apple.com/wss/fonts?family=SF+M... https://www.apple.com/wss/fonts?family=SF+Mono&v=2 — 200 — 1.5 KiB — 42 ms — http/1.1https://www.apple.com/wss/fonts?family=Apple+Icons&v=1www.apple.com/wss/fonts?family=Appl... https://www.apple.com/wss/fonts?family=Apple+Icons&v=1 — 200 — 1.4 KiB — 41 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-08-07 — 2026-09-03)

LCP (p75)

1553 ms

91% good

INP (p75)

61 ms

97% good

CLS (p75)

0.000

100% good

FCP (p75)

1351 ms

TTFB (p75)

1042 ms

This origin passes Core Web Vitals assessment
Image Optimization
33 images, 6275 KB total, 3369 KB wasted
INFO

Image Optimization Audit

Total Images

33

Total Size

6275 KB

Oversized

24

Wasted

3369 KB

29 missing dimensions 20 missing lazy loading
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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