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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
59
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.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

2.21 s

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

12.80 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.

0.043

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

3.46 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.

13.71 s

Page Load Progression

767 ms
1.5 s
2.3 s
3.1 s
3.8 s
4.6 s
5.4 s
6.1 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
28.5 MB transferred, 121 requests
FIX
28.5 MB transferred, 121 requests
Critical::
Page weighs 29.8 MB (28.5 MB transferred)
Warning::
Images are 23.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 23.2 MB
Warning::
JavaScript is 575 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 575 KB
Info::
Fonts are 217 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 217 KB
Warning::
121 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 6.0 g CO2 per page load
28.5 MB / 2.4 MB budget
28.5 MB transferred
121 requests
6.0 g CO2 per page load
Images 23.2 MiB 82%
Other 4.3 MiB 15%
JavaScript 574.7 KiB 2%
Fonts 216.9 KiB 1%
CSS 127.8 KiB 0%
HTML 21.1 KiB 0%
Other 15.6 KiB 0%
Other 9.2 KiB 0%
Other 546 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

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

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 (28.5 MiB of 28.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
121 resources · 28.5 MB · 258 KB savings available
FIX
121 resources · 28.5 MB · 258 KB savings available
Warning::
Page weight 27.5 MB over 1MB target
Got: 28.5 MB Expected: ≤ 1 MB
Info::
~258 KB of savings available
Warning::
120 third-party resources (100% of weight)
Info::
33 resources over 200KB
121 resources · 28.5 MiB · 120 third-party 27.5 MiB over 1MB target
Image 82% · 23.3 MiB
Media 15% · 4.3 MiB
JavaScript 2% · 574.7 KiB
Font 1% · 216.9 KiB
CSS 0% · 132.1 KiB
Document 0% · 24.8 KiB
Other 0% · 1.9 KiB

~257.9 KiB of savings available

Remove unused JavaScript: 257.9 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
64 images, 0 KB saveable
REVIEW
64 images, 0 KB saveable
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://illinois.edu/wp-content/themes/illinois/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
64 images 23.2 MB
0 oversized -0 KB
63 legacy format
8 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

B
JS Execution Cost
522ms total JS execution
REVIEW
522ms total JS execution
Warning::
Unattributable: 304ms CPU time
Info::
https://illinois.edu/: 146ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=GT-KTP...: 72ms CPU time
Warning::
Third-party scripts: 522ms (100% of total)

Main Thread Breakdown

Other 50% Script Evaluation 21% Style & Layout 15% Script Parsing & Compilation 6% Rendering 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable304ms4ms0ms3rd
https://illinois.edu/146ms8ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=GT-KTPV7C372ms61ms8ms3rd
C
JS Bundles
Action
18 scripts, 258 KB unused
REVIEW
18 scripts, 258 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5SX...: 65 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-KTP...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://illinois.edu/wp-content/themes/illinois/js...: 45 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.disability.illinois.edu/skipto.min.js: 36 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.toolkit.illinois.edu/3.7.0/toolkit.js: 24 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 258 KB
258 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-5SX53NV7125 KB65 KB (52%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-KTPV7C3157 KB65 KB (41%)✓3rd
https://illinois.edu/wp-content/themes/illinois/js/search.js72 KB45 KB (63%)✓3rd
https://cdn.disability.illinois.edu/skipto.min.js95 KB36 KB (38%)✓3rd
https://cdn.toolkit.illinois.edu/3.7.0/toolkit.js55 KB24 KB (44%)✓3rd
https://illinois.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.135 KB23 KB (67%)✓3rd
https://illinois.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.16 KB—✓3rd
https://illinois.edu/wp-content/themes/illinois/js/skiptoconf.js?ver=6.8.31 KB—✓3rd
https://cdn.brand.illinois.edu/components/il-footer.mjs9 KB—✓3rd
https://onetrust.techservices.illinois.edu/scripttemplates/otSDKStub.js6 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

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+
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
2 fonts (217 KB)
PASS
2 fonts (217 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

217 KB total

Render-blocking

0

of 2

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 FCP 2.2 s LCP 12.8 shttps://cdn.brand.illinois.edu/fonts/source-sans/source-sans-var.woff2source-sans-var.woff2 https://cdn.brand.illinois.edu/fonts/source-sans/source-sans-var.woff2 — 135.0 KiB — 50 ms — font-display: swaphttps://cdn.brand.illinois.edu/fonts/montserrat/montserrat-700.woff2montserrat-700.woff2 https://cdn.brand.illinois.edu/fonts/montserrat/montserrat-700.woff2 — 81.9 KiB — 57 ms — font-display: swap
source-sans-var.woff2 woff2 swap
Size 135 KB
Load time 50 ms
Start 1.8 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
montserrat-700.woff2 woff2 swap
Size 82 KB
Load time 57 ms
Start 1.8 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 ~67 KB and ~134 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
Network Waterfall
121 requests over 3985ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 2.2 s LCP 12.8 shttps://uiuc.edu// https://uiuc.edu/ — 301 — 222 B — 363 ms — http/1.1https://illinois.edu/illinois.edu/ https://illinois.edu/ — 200 — 21.1 KiB — 489 ms — http/1.1https://illinois.edu/wp-includes/css/dist/block-library/style.min.css?ver=6.8.3illinois.edu/wp-includes/css/dist/b... https://illinois.edu/wp-includes/css/dist/block-library/style.min.css?ver=6.8.3 — 200 — 19.7 KiB — 132 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/style.css?ver=02.13.2026illinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/style.css?ver=02.13.2026 — 200 — 1.4 KiB — 260 ms — http/1.1https://cdn.brand.illinois.edu/illinois.css?ver=6.8.3cdn.brand.illinois.edu/illinois.css... https://cdn.brand.illinois.edu/illinois.css?ver=6.8.3 — 200 — 2.0 KiB — 60 ms — h2https://cdn.toolkit.illinois.edu/3.7.0/toolkit.csscdn.toolkit.illinois.edu/3.7.0/tool... https://cdn.toolkit.illinois.edu/3.7.0/toolkit.css — 200 — 65.6 KiB — 140 ms — h2https://cdn.brand.illinois.edu/components/il-footer.css?ver=6.8.3cdn.brand.illinois.edu/components/i... https://cdn.brand.illinois.edu/components/il-footer.css?ver=6.8.3 — 200 — 1.3 KiB — 62 ms — h2https://illinois.edu/wp-content/plugins/illinois-calendar//js/calendar.js?ver=6.8.3illinois.edu/wp-content/plugins/ill... https://illinois.edu/wp-content/plugins/illinois-calendar//js/calendar.js?ver=6.8.3 — 200 — 4.0 KiB — 355 ms — http/1.1https://illinois.edu/wp-content/plugins/illinois-calendar//js/slider.js?ver=6.8.3illinois.edu/wp-content/plugins/ill... https://illinois.edu/wp-content/plugins/illinois-calendar//js/slider.js?ver=6.8.3 — 200 — 2.2 KiB — 359 ms — http/1.1https://illinois.edu/wp-content/plugins/illinois-card-carousel//js/card-carousel.js?ver=6.8.3illinois.edu/wp-content/plugins/ill... https://illinois.edu/wp-content/plugins/illinois-card-carousel//js/card-carousel.js?ver=6.8.3 — 200 — 1.8 KiB — 362 ms — http/1.1https://illinois.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1illinois.edu/wp-includes/js/jquery/... https://illinois.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 35.1 KiB — 483 ms — http/1.1https://illinois.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1illinois.edu/wp-includes/js/jquery/... https://illinois.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.7 KiB — 367 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/js/skiptoconf.js?ver=6.8.3illinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/js/skiptoconf.js?ver=6.8.3 — 200 — 813 B — 383 ms — http/1.1https://cdn.disability.illinois.edu/skipto.min.jscdn.disability.illinois.edu/skipto.... https://cdn.disability.illinois.edu/skipto.min.js — 200 — 95.3 KiB — 87 ms — http/1.1https://cdn.toolkit.illinois.edu/3.7.0/toolkit.jscdn.toolkit.illinois.edu/3.7.0/tool... https://cdn.toolkit.illinois.edu/3.7.0/toolkit.js — 200 — 55.1 KiB — 122 ms — h2https://cdn.brand.illinois.edu/components/il-footer.mjscdn.brand.illinois.edu/components/i... https://cdn.brand.illinois.edu/components/il-footer.mjs — 200 — 9.0 KiB — 57 ms — h2https://onetrust.techservices.illinois.edu/scripttemplates/otSDKStub.jsonetrust.techservices.illinois.edu/... https://onetrust.techservices.illinois.edu/scripttemplates/otSDKStub.js — 200 — 5.7 KiB — 71 ms — h2https://illinois.edu/wp-content/uploads/2025/07/Journey-PNG-scaled-2-1024x534.pngillinois.edu/wp-content/uploads/202... https://illinois.edu/wp-content/uploads/2025/07/Journey-PNG-scaled-2-1024x534.png — 200 — 32.8 KiB — 997 ms — http/1.1blob:https://illinois.edu/2ebf88d8-0812-42e8-8370-ebafd367db77illinois.edu/2ebf88d8-0812-42e8-837... blob:https://illinois.edu/2ebf88d8-0812-42e8-8370-ebafd367db77 — 200 — -1 B — 38 ms — blobhttps://cdn.brand.illinois.edu/illinois.csscdn.brand.illinois.edu/illinois.css https://cdn.brand.illinois.edu/illinois.css — 200 — 2.0 KiB — 18 ms — h2https://illinois.edu/wp-content/themes/illinois/css/typography.cssillinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/css/typography.css — 200 — 1.6 KiB — 220 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/wp-overrides.cssillinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/css/wp-overrides.css — 200 — 1.6 KiB — 223 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/wigg.cssillinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/css/wigg.css — 200 — 1.1 KiB — 227 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/header.cssillinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/css/header.css — 200 — 3.7 KiB — 237 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/footer.cssillinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/css/footer.css — 200 — 1.9 KiB — 252 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/search.cssillinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/css/search.css — 200 — 3.7 KiB — 343 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/page.cssillinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/css/page.css — 200 — 990 B — 355 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/slider.cssillinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/css/slider.css — 200 — 2.0 KiB — 349 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/card-carousel.cssillinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/css/card-carousel.css — 200 — 3.1 KiB — 352 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/calendar.cssillinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/css/calendar.css — 200 — 2.3 KiB — 363 ms — http/1.1
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 2.2 s LCP 12.8 shttps://uiuc.edu// https://uiuc.edu/ — 301 — 222 B — 363 ms — http/1.1https://illinois.edu/illinois.edu/ https://illinois.edu/ — 200 — 21.1 KiB — 489 ms — http/1.1https://illinois.edu/wp-includes/css/dist/block-library/style.min.css?ver=6.8.3illinois.edu/wp-includes/css/dist/b... https://illinois.edu/wp-includes/css/dist/block-library/style.min.css?ver=6.8.3 — 200 — 19.7 KiB — 132 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/style.css?ver=02.13.2026illinois.edu/wp-content/themes/illi... https://illinois.edu/wp-content/themes/illinois/style.css?ver=02.13.2026 — 200 — 1.4 KiB — 260 ms — http/1.1https://cdn.brand.illinois.edu/illinois.css?ver=6.8.3cdn.brand.illinois.edu/illinois.css... https://cdn.brand.illinois.edu/illinois.css?ver=6.8.3 — 200 — 2.0 KiB — 60 ms — h2https://cdn.toolkit.illinois.edu/3.7.0/toolkit.csscdn.toolkit.illinois.edu/3.7.0/tool... https://cdn.toolkit.illinois.edu/3.7.0/toolkit.css — 200 — 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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
100% of JavaScript execution is third-party
First-party Third-party 522ms · 179KB · $9/mo
Unattributable
Other
Costly
Execution 304ms
Transfer 0 KB
Monthly Cost $5/mo
illinois.edu
Other
Optional
Execution 146ms
Transfer 21 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 72ms
Transfer 157 KB
Unused 41%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 304ms and costs ~$5/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

Unattributable takes 304ms 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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