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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
78
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.
83
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.

1.44 s

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

2.80 s

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

24 ms

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

0.012

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

1.80 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.

3.66 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
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
25.4 MB transferred, 95 requests
FIX
25.4 MB transferred, 95 requests
Critical::
Page weighs 28.4 MB (25.4 MB transferred)
Warning::
Images are 23.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 23.5 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
Info::
Fonts are 420 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 420 KB
Info::
95 HTTP requests
Info::
Estimated 5.3 g CO2 per page load
25.4 MB / 2.4 MB budget
25.4 MB transferred
95 requests
5.3 g CO2 per page load
Images 23.5 MiB 93%
JavaScript 1.2 MiB 5%
Fonts 420.4 KiB 2%
CSS 118.2 KiB 0%
Other 58.4 KiB 0%
Other 39.6 KiB 0%
HTML 29.1 KiB 0%
Other 2.5 KiB 0%
Other 2.0 KiB 0%
Other 294 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

D
Third-Party Impact
Action
96% third-party, 0 ms blocking
FIX
96% third-party, 0 ms blocking
Warning::
Third-party code accounts for 96% of page weight (24.3 MiB of 25.4 MiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
F
JS Bundles
Action
23 scripts, 553 KB unused
FIX
23 scripts, 553 KB unused
Warning::
https://1f953c479d22.47e58bb0.eu-west-3.token.awsw...: 314 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-3F71...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-343...: 64 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://iec.ch/sites/default/files/js/js_Grfmv-5CN...: 44 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://iec.ch/sites/default/files/js/js_V8xutc9hh...: 41 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 553 KB
553 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://1f953c479d22.47e58bb0.eu-west-3.token.awswaf.com/1f953c479d22/474d1bb585aa/141fa6216ac8/challenge.js576 KB314 KB (55%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-3F71XQS4K3157 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-34398331-1125 KB64 KB (52%)✓3rd
https://iec.ch/sites/default/files/js/js_Grfmv-5CNuzze62geIH5mnA8ZbV79-qXQF_qSatz_dc.js?scope=footer&delta=0&language=en&theme=iec&include=eJyFUgFuwyAM_BCFJyEDbuIGMAKzNr8faGvabp0mIfnubMCcgQvcbGQIWA08sJa1snNYlQO_WeGxinnC9tL-TJHnrM6cBa7YOKF5wvqKbtL2b4FuKyW1MC8RLWSIu5Bv5qegCL0NfM2zcSt19DGe8k7Ur3sSUPTjijKLTwdTCYQTm6-gGnuCaBMGAhspb838loZbmFC1vQmmYUVDhTeZKRNqLxD1N1XYrWfeCEdIJRJkj-adaAOeoUdRSTwU8SuYA50gJMqn5iuVYeS7ikjuyDtmacODYgoX_pgzPRRhjkJFFaiwDGFt944fiu65dBeprRhU2DMk8jbCzl1G9Su35zpmhzlMi43nnqUX5bni_dxhWuRFz7_2CcSr-zA63 KB44 KB (72%)✓1st
https://iec.ch/sites/default/files/js/js_V8xutc9hhgLgmFSIbTZQgFS9UbxQIMiEo2hXKiB-JVw.js?scope=footer&delta=10&language=en&theme=iec&include=eJyFUgFuwyAM_BCFJyEDbuIGMAKzNr8faGvabp0mIfnubMCcgQvcbGQIWA08sJa1snNYlQO_WeGxinnC9tL-TJHnrM6cBa7YOKF5wvqKbtL2b4FuKyW1MC8RLWSIu5Bv5qegCL0NfM2zcSt19DGe8k7Ur3sSUPTjijKLTwdTCYQTm6-gGnuCaBMGAhspb838loZbmFC1vQmmYUVDhTeZKRNqLxD1N1XYrWfeCEdIJRJkj-adaAOeoUdRSTwU8SuYA50gJMqn5iuVYeS7ikjuyDtmacODYgoX_pgzPRRhjkJFFaiwDGFt944fiu65dBeprRhU2DMk8jbCzl1G9Su35zpmhzlMi43nnqUX5bni_dxhWuRFz7_2CcSr-zA55 KB41 KB (78%)✓1st
https://cdn.datatables.net/1.11.5/js/jquery.dataTables.min.js29 KB24 KB (83%)✓3rd
https://cdn.datatables.net/buttons/2.2.2/js/dataTables.buttons.min.js8 KB—✓3rd
https://service.mtcaptcha.com/mtcv1/client/mtcaptcha2.min.js28 KB—✓3rd
https://iec.ch/sites/default/files/js/js_J1kGqRCVz4jsj90bkXYtYg3tQBxeFY-hIzeCLqiSG8I.js?scope=footer&delta=5&language=en&theme=iec&include=eJyFUgFuwyAM_BCFJyEDbuIGMAKzNr8faGvabp0mIfnubMCcgQvcbGQIWA08sJa1snNYlQO_WeGxinnC9tL-TJHnrM6cBa7YOKF5wvqKbtL2b4FuKyW1MC8RLWSIu5Bv5qegCL0NfM2zcSt19DGe8k7Ur3sSUPTjijKLTwdTCYQTm6-gGnuCaBMGAhspb838loZbmFC1vQmmYUVDhTeZKRNqLxD1N1XYrWfeCEdIJRJkj-adaAOeoUdRSTwU8SuYA50gJMqn5iuVYeS7ikjuyDtmacODYgoX_pgzPRRhjkJFFaiwDGFt944fiu65dBeprRhU2DMk8jbCzl1G9Su35zpmhzlMi43nnqUX5bni_dxhWuRFz7_2CcSr-zA8 KB—✓1st
https://iec.ch/sites/default/files/js/js_ySqz9Cpe0HnRCfdX5b0QYJhxQbF_M8NFYsGAGPIFarY.js?scope=footer&delta=3&language=en&theme=iec&include=eJyFUgFuwyAM_BCFJyEDbuIGMAKzNr8faGvabp0mIfnubMCcgQvcbGQIWA08sJa1snNYlQO_WeGxinnC9tL-TJHnrM6cBa7YOKF5wvqKbtL2b4FuKyW1MC8RLWSIu5Bv5qegCL0NfM2zcSt19DGe8k7Ur3sSUPTjijKLTwdTCYQTm6-gGnuCaBMGAhspb838loZbmFC1vQmmYUVDhTeZKRNqLxD1N1XYrWfeCEdIJRJkj-adaAOeoUdRSTwU8SuYA50gJMqn5iuVYeS7ikjuyDtmacODYgoX_pgzPRRhjkJFFaiwDGFt944fiu65dBeprRhU2DMk8jbCzl1G9Su35zpmhzlMi43nnqUX5bni_dxhWuRFz7_2CcSr-zA9 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

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
95 resources · 25.4 MB · 553 KB savings available
FIX
95 resources · 25.4 MB · 553 KB savings available
Warning::
Page weight 24.4 MB over 1MB target
Got: 25.4 MB Expected: ≤ 1 MB
Info::
~553 KB of savings available
Warning::
58 third-party resources (96% of weight)
Info::
6 resources over 200KB
95 resources · 25.4 MiB · 58 third-party 24.4 MiB over 1MB target
Image 93% · 23.6 MiB
JavaScript 5% · 1.2 MiB
Font 2% · 420.4 KiB
CSS 0% · 118.2 KiB
Other 0% · 44.4 KiB
Document 0% · 31.4 KiB

~552.9 KiB of savings available

Remove unused JavaScript: 552.9 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, max-age=0

DirectiveValueMeaning
no-store—Never cache this response
max-age0Cache for 0 seconds
C
Image Optimization
Action
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iec.ch/themes/custom/iec/images/IEC_logo.j... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
31 images 23.5 MB
0 oversized -0 KB
25 legacy format
2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
631ms total JS execution
REVIEW
631ms total JS execution
Info::
https://iec.ch/homepage: 183ms CPU time
Info::
https://1f953c479d22.47e58bb0.eu-west-3.token.awsw...: 176ms CPU time
Info::
https://iec.ch/sites/default/files/js/js_2g2mk58gC...: 116ms CPU time
Info::
Unattributable: 103ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-3F71...: 54ms CPU time
Warning::
Third-party scripts: 332ms (53% of total)

Main Thread Breakdown

Script Evaluation 45% Other 19% Style & Layout 18% Script Parsing & Compilation 9% Rendering 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://iec.ch/homepage183ms1ms0ms1st
https://1f953c479d22.47e58bb0.eu-west-3.token.awswaf.com/1f953c479d22/474d1bb585aa/141fa6216ac8/challenge.js176ms125ms31ms3rd
https://iec.ch/sites/default/files/js/js_2g2mk58gC-hC2ZmNgiVSVjoJSdmset05MmxbHMiDtbI.js?scope=header&delta=0&language=en&theme=iec&include=eJyFUgFuwyAM_BCFJyEDbuIGMAKzNr8faGvabp0mIfnubMCcgQvcbGQIWA08sJa1snNYlQO_WeGxinnC9tL-TJHnrM6cBa7YOKF5wvqKbtL2b4FuKyW1MC8RLWSIu5Bv5qegCL0NfM2zcSt19DGe8k7Ur3sSUPTjijKLTwdTCYQTm6-gGnuCaBMGAhspb838loZbmFC1vQmmYUVDhTeZKRNqLxD1N1XYrWfeCEdIJRJkj-adaAOeoUdRSTwU8SuYA50gJMqn5iuVYeS7ikjuyDtmacODYgoX_pgzPRRhjkJFFaiwDGFt944fiu65dBeprRhU2DMk8jbCzl1G9Su35zpmhzlMi43nnqUX5bni_dxhWuRFz7_2CcSr-zA116ms57ms2ms1st
Unattributable103ms26ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-3F71XQS4K354ms42ms11ms3rd
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
9 fonts (420 KB)
PASS
9 fonts (420 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

420 KB total

Render-blocking

0

of 9

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.4 s LCP 2.8 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 65 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2ieVl2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2 — 45.0 KiB — 69 ms — font-display: swaphttps://use.fontawesome.com/releases/v5.5.0/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://use.fontawesome.com/releases/v5.5.0/webfonts/fa-solid-900.woff2 — 72.7 KiB — 77 ms — font-display: swaphttps://use.fontawesome.com/releases/v5.5.0/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://use.fontawesome.com/releases/v5.5.0/webfonts/fa-brands-400.woff2 — 68.4 KiB — 47 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDwM9QPFUew.woff2ieVj2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDwM9QPFUew.woff2 — 50.3 KiB — 40 ms — font-display: swaphttps://unpkg.com/ionicons@4.4.2/dist/fonts/ionicons.woff2?v=4.4.1ionicons.woff2 https://unpkg.com/ionicons@4.4.2/dist/fonts/ionicons.woff2?v=4.4.1 — 49.9 KiB — 86 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0 — 76.0 KiB — 73 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFOMCnqEu92Fr1ME7kSn66aGLdTylUAMQXC89YmC2DPNWubEbVmUiAo.woff2KFOMCnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFOMCnqEu92Fr1ME7kSn66aGLdTylUAMQXC89YmC2DPNWubEbVmUiAo.woff2 — 21.4 KiB — 65 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFOMCnqEu92Fr1ME7kSn66aGLdTylUAMQXC89YmC2DPNWubEbVmUiAo.woff2KFOMCnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFOMCnqEu92Fr1ME7kSn66aGLdTylUAMQXC89YmC2DPNWubEbVmUiAo.woff2 — 0 B — 59 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 65 ms
Start 892 ms
Risk FOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 45 KB
Load time 69 ms
Start 893 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 73 KB
Load time 77 ms
Start 893 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 68 KB
Load time 47 ms
Start 939 ms
Risk FOUT — text flashes from fallback to web font
ieVj2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 50 KB
Load time 40 ms
Start 939 ms
Risk FOUT — text flashes from fallback to web font
ionicons.woff2 woff2 swap
Size 50 KB
Load time 86 ms
Start 940 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 unknown swap
Size 76 KB
Load time 73 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
KFOMCnqEu92Fr1ME7kSn66a... woff2 swap
Size 21 KB
Load time 65 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
KFOMCnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 59 ms
Start 1.5 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 ~23 KB and ~46 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
95 requests over 2451ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.4 s LCP 2.8 shttps://iec.ch// https://iec.ch/ — 202 — 2.8 KiB — 56 ms — h2https://1f953c479d22.47e58bb0.eu-west-3.token.awswaf.com/1f953c479d22/474d1bb585aa/141fa6216ac8/challenge.js1f953c479d22.47e58bb0.eu-west-3.tok... https://1f953c479d22.47e58bb0.eu-west-3.token.awswaf.com/1f953c479d22/474d1bb585aa/141fa6216ac8/challenge.js — 200 — 575.7 KiB — 145 ms — h2https://1f953c479d22.47e58bb0.eu-west-3.token.awswaf.com/1f953c479d22/474d1bb585aa/141fa6216ac8/inputs?client=browser1f953c479d22.47e58bb0.eu-west-3.tok... https://1f953c479d22.47e58bb0.eu-west-3.token.awswaf.com/1f953c479d22/474d1bb585aa/141fa6216ac8/inputs?client=browser — 200 — 827 B — 48 ms — h3https://iec.ch/favicon.ico/favicon.ico https://iec.ch/favicon.ico — 202 — 402 B — 21 ms — h2https://1f953c479d22.47e58bb0.eu-west-3.token.awswaf.com/1f953c479d22/474d1bb585aa/141fa6216ac8/mp_verify1f953c479d22.47e58bb0.eu-west-3.tok... 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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
53% of JavaScript execution is third-party
First-party Third-party 332ms · 733KB · CHF5/mo
1f953c479d22.47e58bb0.eu-west-3.token.awswaf.com
Other
Optional
Execution 176ms
Transfer 576 KB
Unused 55%
Monthly Cost CHF3/mo
Unattributable
Other
Optional
Execution 103ms
Transfer 0 KB
Monthly Cost CHF2/mo
Google Tag Manager
Tag Manager
Optional
Execution 54ms
Transfer 157 KB
Unused 42%
Monthly Cost CHF1/mo

53% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

55% of 1f953c479d22.47e58bb0.eu-west-3.token.awswaf.com'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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