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https://reading.ac.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
46
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
69
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.

6.95 s

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

20.12 s

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

455 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.

8.35 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.

20.64 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
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 65 requests
FIX
3.7 MB transferred, 65 requests
Warning::
Page weighs 5.5 MB (3.7 MB transferred)
Warning::
Images are 1.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.9 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::
CSS is 286 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 286 KB
Info::
65 HTTP requests
Info::
Estimated 0.77 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
65 requests
0.77 g CO2 per page load
Images 1.9 MiB 52%
JavaScript 1.2 MiB 32%
CSS 285.5 KiB 8%
Fonts 175.8 KiB 5%
HTML 128.5 KiB 3%
Other 10.7 KiB 0%
Other 2.3 KiB 0%
Other 0 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (3.7 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2040ms total JS execution
FIX
2040ms total JS execution
Warning::
https://www.reading.ac.uk/homepage/web/files/dr-ho...: 407ms CPU time
Warning::
Unattributable: 355ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TC3...: 351ms CPU time
Warning::
https://app.termly.io/resource-blocker/b846a047-fc...: 329ms CPU time
Info::
https://www.reading.ac.uk/: 175ms CPU time
Warning::
Third-party scripts: 2040ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 18% Style & Layout 14% Script Parsing & Compilation 12%
ScriptTotalScriptingParse/CompileParty
https://www.reading.ac.uk/homepage/web/files/dr-homepage/web-library.min.js407ms193ms15ms3rd
Unattributable355ms6ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TC325M351ms286ms61ms3rd
https://app.termly.io/resource-blocker/b846a047-fc56-4159-aaf3-7bdc36e97907329ms263ms42ms3rd
https://www.reading.ac.uk/175ms6ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-11016496176&cx=c&gtm=4e64k0121ms73ms48ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-13730620&cx=c&gtm=4e64k088ms54ms33ms3rd
https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-modernizr.custom.04512.js77ms38ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-13024755&cx=c&gtm=4e64k072ms42ms29ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-8556031&cx=c&gtm=4e64k065ms41ms24ms3rd
F
JS Bundles
Action
17 scripts, 621 KB unused
FIX
17 scripts, 621 KB unused
Warning::
https://www.reading.ac.uk/homepage/web/files/dr-ho...: 102 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-110...: 87 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-137...: 81 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-130...: 81 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-855...: 80 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 621 KB
621 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.reading.ac.uk/homepage/web/files/dr-homepage/web-library.min.js177 KB102 KB (58%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-11016496176&cx=c&gtm=4e64k0144 KB87 KB (61%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-13730620&cx=c&gtm=4e64k0132 KB81 KB (61%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-13024755&cx=c&gtm=4e64k0129 KB81 KB (62%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-8556031&cx=c&gtm=4e64k0129 KB80 KB (62%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TC325M192 KB80 KB (41%)✓3rd
https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-jquery-2.1.1.js83 KB56 KB (68%)✓3rd
https://app.termly.io/resource-blocker/b846a047-fc56-4159-aaf3-7bdc36e97907143 KB54 KB (38%)✓3rd
https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-main.min.js1 KB—✓3rd
https://app.termly.io/resource-blocker/support/377-e518d8a5c599aa1c5977.min.js1 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

F
Page Weight Inventory
Action
65 resources · 3.7 MB · 621 KB savings available
FIX
65 resources · 3.7 MB · 621 KB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~621 KB of savings available
Warning::
64 third-party resources (100% of weight)
Info::
2 resources over 200KB
65 resources · 3.7 MiB · 64 third-party 2.7 MiB over 1MB target
Image 52% · 1.9 MiB
JavaScript 32% · 1.2 MiB
CSS 8% · 285.5 KiB
Font 5% · 175.8 KiB
Document 3% · 129.2 KiB
Other 0% · 10.7 KiB

~621.1 KiB of savings available

Remove unused JavaScript: 621.1 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
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
https://www.reading.ac.uk/homepage/web/multimediaf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.reading.ac.uk/homepage/web/multimediaf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.reading.ac.uk/homepage/web/multimediaf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.reading.ac.uk/homepage/web/multimediaf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.reading.ac.uk/homepage/web/multimediaf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.reading.ac.uk/homepage/web/multimediaf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.reading.ac.uk/homepage/web/multimediaf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.reading.ac.uk/homepage/web/multimediaf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.reading.ac.uk/homepage/web/multimediaf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.reading.ac.uk/homepage/web/multimediaf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26 images 1.9 MB
0 oversized -0 KB
26 legacy format
10 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

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
6 fonts (176 KB)
PASS
6 fonts (176 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

176 KB total

Render-blocking

0

of 6

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 14.0 s 16.0 s 18.0 s 20.0 s FCP 6.9 s LCP 20.1 shttps://www.reading.ac.uk/homepage/web/files/campaigns/effra-light.woffeffra-light.woff https://www.reading.ac.uk/homepage/web/files/campaigns/effra-light.woff — 29.6 KiB — 62 ms — font-display: swaphttps://www.reading.ac.uk/homepage/web/files/campaigns/effra-heavy.woffeffra-heavy.woff https://www.reading.ac.uk/homepage/web/files/campaigns/effra-heavy.woff — 28.9 KiB — 36 ms — font-display: swaphttps://www.reading.ac.uk/homepage/web/files/campaigns/effra-medium.woffeffra-medium.woff https://www.reading.ac.uk/homepage/web/files/campaigns/effra-medium.woff — 28.8 KiB — 34 ms — font-display: swaphttps://www.reading.ac.uk/homepage/web/files/campaigns/effra-bold.woffeffra-bold.woff https://www.reading.ac.uk/homepage/web/files/campaigns/effra-bold.woff — 29.6 KiB — 59 ms — font-display: swaphttps://www.reading.ac.uk/homepage/web/files/campaigns/effra-regular.woffeffra-regular.woff https://www.reading.ac.uk/homepage/web/files/campaigns/effra-regular.woff — 30.3 KiB — 58 ms — font-display: swaphttps://www.reading.ac.uk/homepage/web/files/campaigns/rdgvesta-regular.woffrdgvesta-regular.woff https://www.reading.ac.uk/homepage/web/files/campaigns/rdgvesta-regular.woff — 28.7 KiB — 58 ms — font-display: swap
effra-light.woff woff swap
Size 30 KB
Load time 62 ms
Start 648 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
effra-heavy.woff woff swap
Size 29 KB
Load time 36 ms
Start 690 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
effra-medium.woff woff swap
Size 29 KB
Load time 34 ms
Start 780 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
effra-bold.woff woff swap
Size 30 KB
Load time 59 ms
Start 781 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
effra-regular.woff woff swap
Size 30 KB
Load time 58 ms
Start 781 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
rdgvesta-regular.woff woff swap
Size 29 KB
Load time 58 ms
Start 781 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~53 KB and ~106 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
1
preload
1
dns-prefetch
1
prefetch
—

3 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
65 requests over 1148ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 6.9 s LCP 20.1 shttps://reading.ac.uk// https://reading.ac.uk/ — 301 — 384 B — 93 ms — http/1.1http://www.reading.ac.uk/www.reading.ac.uk/ http://www.reading.ac.uk/ — 307 — 0 B — 2 ms — http/1.1https://www.reading.ac.uk/www.reading.ac.uk/ https://www.reading.ac.uk/ — 200 — 128.5 KiB — 204 ms — http/1.1https://www.reading.ac.uk/sc93/js/uor.module.cookie-blocker.jswww.reading.ac.uk/sc93/js/uor.modul... https://www.reading.ac.uk/sc93/js/uor.module.cookie-blocker.js — 200 — 5.4 KiB — 123 ms — http/1.1https://app.termly.io/resource-blocker/b846a047-fc56-4159-aaf3-7bdc36e97907app.termly.io/resource-blocker/b846... https://app.termly.io/resource-blocker/b846a047-fc56-4159-aaf3-7bdc36e97907 — 200 — 143.4 KiB — 335 ms — h3https://www.reading.ac.uk/homepage/web/files/dr-homepage/assets-css-main.csswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/assets-css-main.css — 200 — 198.7 KiB — 180 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/february-assets-css-main.csswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/february-assets-css-main.css — 200 — 12.7 KiB — 116 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/css-main.csswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/css-main.css — 200 — 53.1 KiB — 138 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/css-hero-slider-style-2.csswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/css-hero-slider-style-2.css — 200 — 18.0 KiB — 112 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/clearing-2025.csswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/clearing-2025.css — 200 — 2.0 KiB — 93 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-modernizr.custom.04512.jswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-modernizr.custom.04512.js — 200 — 15.6 KiB — 131 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-hamburger.pngwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-hamburger.png — 200 — 1.5 KiB — 32 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-uor-home-mobile.pngwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-uor-home-mobile.png — 200 — 6.1 KiB — 32 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-uor-home.pngwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-uor-home.png — 200 — 5.4 KiB — 32 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/centenary-homepage-banner.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/centenary-homepage-banner.jpg — 200 — 126.1 KiB — 84 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-jquery-2.1.1.jswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-jquery-2.1.1.js — 200 — 82.7 KiB — 60 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-main.min.jswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-main.min.js — 200 — 962 B — 32 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-slider2.jswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-slider2.js — 200 — 4.7 KiB — 31 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/web-library.min.jswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/web-library.min.js — 200 — 176.7 KiB — 57 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/web-components.min.jswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/web-components.min.js — 200 — 18.3 KiB — 31 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/ug-open-days-banner.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/ug-open-days-banner.jpg — 200 — 404.4 KiB — 60 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/B35381-Spring-Webinar-Graphics-banner.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/B35381-Spring-Webinar-Graphics-banner.jpg — 200 — 233.1 KiB — 59 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/sunrise-from-space.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/sunrise-from-space.jpg — 200 — 197.2 KiB — 37 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/2026-centenary-merchandise-desktop.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/2026-centenary-merchandise-desktop.jpg — 200 — 170.2 KiB — 51 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/2026-centenary-merchandise-mobile.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/2026-centenary-merchandise-mobile.jpg — 200 — 184.8 KiB — 70 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-Great-course-selection-296x150.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-Great-course-selection-296x150.jpg — 200 — 75.6 KiB — 69 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-Explore-student-life-296x150.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-Explore-student-life-296x150.jpg — 200 — 53.7 KiB — 93 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/unibuddy256x150.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/unibuddy256x150.jpg — 200 — 26.2 KiB — 50 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/campaigns/effra-light.woffwww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/campaigns/effra-light.woff — 200 — 29.6 KiB — 62 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-TC325Mwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TC325M — 200 — 192.5 KiB — 210 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 6.9 s LCP 20.1 shttps://reading.ac.uk// https://reading.ac.uk/ — 301 — 384 B — 93 ms — http/1.1http://www.reading.ac.uk/www.reading.ac.uk/ http://www.reading.ac.uk/ — 307 — 0 B — 2 ms — http/1.1https://www.reading.ac.uk/www.reading.ac.uk/ https://www.reading.ac.uk/ — 200 — 128.5 KiB — 204 ms — http/1.1https://www.reading.ac.uk/sc93/js/uor.module.cookie-blocker.jswww.reading.ac.uk/sc93/js/uor.modul... https://www.reading.ac.uk/sc93/js/uor.module.cookie-blocker.js — 200 — 5.4 KiB — 123 ms — http/1.1https://app.termly.io/resource-blocker/b846a047-fc56-4159-aaf3-7bdc36e97907app.termly.io/resource-blocker/b846... https://app.termly.io/resource-blocker/b846a047-fc56-4159-aaf3-7bdc36e97907 — 200 — 143.4 KiB — 335 ms — h3https://www.reading.ac.uk/homepage/web/files/dr-homepage/assets-css-main.csswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/assets-css-main.css — 200 — 198.7 KiB — 180 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/february-assets-css-main.csswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/february-assets-css-main.css — 200 — 12.7 KiB — 116 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/css-main.csswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/css-main.css — 200 — 53.1 KiB — 138 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/css-hero-slider-style-2.csswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/css-hero-slider-style-2.css — 200 — 18.0 KiB — 112 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/clearing-2025.csswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/clearing-2025.css — 200 — 2.0 KiB — 93 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-modernizr.custom.04512.jswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-modernizr.custom.04512.js — 200 — 15.6 KiB — 131 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-hamburger.pngwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-hamburger.png — 200 — 1.5 KiB — 32 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-uor-home-mobile.pngwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-uor-home-mobile.png — 200 — 6.1 KiB — 32 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-uor-home.pngwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-uor-home.png — 200 — 5.4 KiB — 32 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/centenary-homepage-banner.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/centenary-homepage-banner.jpg — 200 — 126.1 KiB — 84 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-jquery-2.1.1.jswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-jquery-2.1.1.js — 200 — 82.7 KiB — 60 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-main.min.jswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-main.min.js — 200 — 962 B — 32 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-slider2.jswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/js-slider2.js — 200 — 4.7 KiB — 31 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/web-library.min.jswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/web-library.min.js — 200 — 176.7 KiB — 57 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/dr-homepage/web-components.min.jswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/web-components.min.js — 200 — 18.3 KiB — 31 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/ug-open-days-banner.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/ug-open-days-banner.jpg — 200 — 404.4 KiB — 60 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/B35381-Spring-Webinar-Graphics-banner.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/B35381-Spring-Webinar-Graphics-banner.jpg — 200 — 233.1 KiB — 59 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/sunrise-from-space.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/sunrise-from-space.jpg — 200 — 197.2 KiB — 37 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/2026-centenary-merchandise-desktop.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/2026-centenary-merchandise-desktop.jpg — 200 — 170.2 KiB — 51 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/2026-centenary-merchandise-mobile.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/2026-centenary-merchandise-mobile.jpg — 200 — 184.8 KiB — 70 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-Great-course-selection-296x150.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-Great-course-selection-296x150.jpg — 200 — 75.6 KiB — 69 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-Explore-student-life-296x150.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-Explore-student-life-296x150.jpg — 200 — 53.7 KiB — 93 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/unibuddy256x150.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/unibuddy256x150.jpg — 200 — 26.2 KiB — 50 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/campaigns/effra-light.woffwww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/campaigns/effra-light.woff — 200 — 29.6 KiB — 62 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-TC325Mwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TC325M — 200 — 192.5 KiB — 210 ms — h2https://www.reading.ac.uk/homepage/web/files/campaigns/effra-heavy.woffwww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/campaigns/effra-heavy.woff — 200 — 28.9 KiB — 36 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-latest-news-296x150.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-latest-news-296x150.jpg — 200 — 40.4 KiB — 34 ms — http/1.1https://app.termly.io/api/v1/snippets/websites/b846a047-fc56-4159-aaf3-7bdc36e97907/statisticsapp.termly.io/api/v1/snippets/websi... https://app.termly.io/api/v1/snippets/websites/b846a047-fc56-4159-aaf3-7bdc36e97907/statistics — 200 — 0 B — 203 ms — h3https://www.reading.ac.uk/homepage/web/multimediafiles/teaching-and-learning-296x150.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/teaching-and-learning-296x150.jpg — 200 — 42.8 KiB — 38 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-Get-a-Room1-296x150.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-Get-a-Room1-296x150.jpg — 200 — 48.3 KiB — 37 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/connectedworld296x150.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/connectedworld296x150.jpg — 200 — 92.1 KiB — 36 ms — http/1.1https://app.termly.io/api/v1/snippets/websites/b846a047-fc56-4159-aaf3-7bdc36e97907/cookies?lang=enapp.termly.io/api/v1/snippets/websi... https://app.termly.io/api/v1/snippets/websites/b846a047-fc56-4159-aaf3-7bdc36e97907/cookies?lang=en — 200 — 6.6 KiB — 216 ms — h3https://www.reading.ac.uk/homepage/web/multimediafiles/business-296x150px.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/business-296x150px.jpg — 200 — 40.2 KiB — 35 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-uorm-1-296x150.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/assets-home-uorm-1-296x150.jpg — 200 — 16.1 KiB — 35 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/assets-new-images-landing_footer_desktop.jpgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/assets-new-images-landing_footer_desktop.jpg — 200 — 92.9 KiB — 65 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/magnifying-glass.svgwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/magnifying-glass.svg — 200 — 1.1 KiB — 40 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/assets-img-icons-s35e128c89f.pngwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/assets-img-icons-s35e128c89f.png — 200 — 99.7 KiB — 56 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/weibo.pngwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/weibo.png — 200 — 4.1 KiB — 35 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/assets-new-ig-chart-94-white.gifwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/assets-new-ig-chart-94-white.gif — 200 — 1.7 KiB — 41 ms — http/1.1https://www.reading.ac.uk/homepage/web/multimediafiles/assets-new-ig-book-white.gifwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/assets-new-ig-book-white.gif — 200 — 3.8 KiB — 40 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/sprite/main-sprite.pngwww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/sprite/main-sprite.png — 302 — 385 B — 68 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/campaigns/effra-medium.woffwww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/campaigns/effra-medium.woff — 200 — 28.8 KiB — 34 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/campaigns/effra-bold.woffwww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/campaigns/effra-bold.woff — 200 — 29.6 KiB — 59 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/campaigns/effra-regular.woffwww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/campaigns/effra-regular.woff — 200 — 30.3 KiB — 58 ms — http/1.1https://www.reading.ac.uk/homepage/web/files/campaigns/rdgvesta-regular.woffwww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/campaigns/rdgvesta-regular.woff — 200 — 28.7 KiB — 58 ms — http/1.1https://app.termly.io/resource-blocker/support/377-e518d8a5c599aa1c5977.min.jsapp.termly.io/resource-blocker/supp... https://app.termly.io/resource-blocker/support/377-e518d8a5c599aa1c5977.min.js — 200 — 873 B — 28 ms — h3https://www.reading.ac.uk/homepage/web/multimediafiles/assets-new-ig-investments-white-red.gifwww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/assets-new-ig-investments-white-red.gif — 200 — 4.0 KiB — 37 ms — http/1.1https://app.termly.io/resource-blocker/i18n/en.jsonapp.termly.io/resource-blocker/i18n... https://app.termly.io/resource-blocker/i18n/en.json — 204 — 0 B — 210 ms — h3https://www.reading.ac.uk/homepage/web/files/dr-homepage/legacy-print.csswww.reading.ac.uk/homepage/web/file... https://www.reading.ac.uk/homepage/web/files/dr-homepage/legacy-print.css — 200 — 938 B — 33 ms — http/1.1https://app.termly.io/resource-blocker/support/894-6156b36a131577c56e7e.min.jsapp.termly.io/resource-blocker/supp... https://app.termly.io/resource-blocker/support/894-6156b36a131577c56e7e.min.js — 200 — 8.4 KiB — 36 ms — h3https://app.termly.io/resource-blocker/support/861-8c5cb8c2beda05e3176b.min.jsapp.termly.io/resource-blocker/supp... https://app.termly.io/resource-blocker/support/861-8c5cb8c2beda05e3176b.min.js — 200 — 2.3 KiB — 35 ms — h3https://www.reading.ac.uk/search/404.htmwww.reading.ac.uk/search/404.htm https://www.reading.ac.uk/search/404.htm — 404 — 3.1 KiB — 167 ms — http/1.1https://app.termly.io/resource-blocker/support/524-7d36cb122791702e3df2.min.jsapp.termly.io/resource-blocker/supp... https://app.termly.io/resource-blocker/support/524-7d36cb122791702e3df2.min.js — 200 — 2.7 KiB — 25 ms — h3https://app.termly.io/api/v1/snippets/websites/b846a047-fc56-4159-aaf3-7bdc36e97907/statisticsapp.termly.io/api/v1/snippets/websi... https://app.termly.io/api/v1/snippets/websites/b846a047-fc56-4159-aaf3-7bdc36e97907/statistics — 201 — 592 B — 223 ms — h3https://www.googletagmanager.com/gtag/js?id=AW-11016496176&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-11016496176&cx=c&gtm=4e64k0 — 200 — 143.5 KiB — 58 ms — h2https://www.googletagmanager.com/gtag/js?id=DC-13024755&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=DC-13024755&cx=c&gtm=4e64k0 — 200 — 129.3 KiB — 73 ms — h2https://www.googletagmanager.com/gtag/js?id=DC-13730620&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=DC-13730620&cx=c&gtm=4e64k0 — 200 — 131.7 KiB — 39 ms — h2https://www.googletagmanager.com/gtag/js?id=DC-8556031&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=DC-8556031&cx=c&gtm=4e64k0 — 200 — 129.3 KiB — 73 ms — h2https://app.termly.io/resource-blocker/i18n/en.jsonapp.termly.io/resource-blocker/i18n... https://app.termly.io/resource-blocker/i18n/en.json — 200 — 3.5 KiB — 28 ms — h3https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-favicon.icowww.reading.ac.uk/homepage/web/mult... https://www.reading.ac.uk/homepage/web/multimediafiles/legacy-favicon.ico — 200 — 1.5 KiB — 34 ms — http/1.1
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 2040ms · 1191KB · £21/mo
www.reading.ac.uk
Other
Costly
Execution 407ms
Transfer 177 KB
Unused 58%
Monthly Cost £4/mo
Unattributable
Other
Costly
Execution 355ms
Transfer 0 KB
Monthly Cost £4/mo
Google Tag Manager
Tag Manager
Costly
Execution 351ms
Transfer 192 KB
Unused 41%
Monthly Cost £4/mo
app.termly.io
Other
Costly
Execution 329ms
Transfer 143 KB
Unused 38%
Monthly Cost £3/mo
www.reading.ac.uk
Other
Optional
Execution 175ms
Transfer 128 KB
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 121ms
Transfer 144 KB
Unused 61%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 88ms
Transfer 132 KB
Unused 61%
Monthly Cost £1/mo
www.reading.ac.uk
Other
Optional
Execution 77ms
Transfer 16 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 72ms
Transfer 129 KB
Unused 62%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 65ms
Transfer 129 KB
Unused 62%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.reading.ac.uk adds 407ms and costs ~£4/month
  • Unattributable adds 355ms and costs ~£4/month
  • Google Tag Manager adds 351ms and costs ~£4/month
  • app.termly.io adds 329ms and costs ~£3/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

www.reading.ac.uk takes 407ms 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

58% of www.reading.ac.uk'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

Unattributable takes 355ms 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

Google Tag Manager takes 351ms 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

app.termly.io takes 329ms 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

61% of Google Tag Manager'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

61% of Google Tag Manager'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

62% of Google Tag Manager'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

62% of Google Tag Manager'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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