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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
43
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
71
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

1.42 s

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

3.86 s

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

26 ms

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

2.385

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

3.01 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.

3.98 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
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
5.1 MB transferred, 112 requests
FIX
5.1 MB transferred, 112 requests
Critical::
Page weighs 9.8 MB (5.1 MB transferred)
Warning::
Images are 2.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.9 MB
Warning::
JavaScript is 1.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.6 MB
Info::
Fonts are 425 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 425 KB
Warning::
112 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.1 MB / 2.4 MB budget
5.1 MB transferred
112 requests
1.1 g CO2 per page load
Images 2.9 MiB 57%
JavaScript 1.6 MiB 31%
Fonts 425.2 KiB 8%
CSS 160.5 KiB 3%
HTML 22.9 KiB 0%
Other 22.1 KiB 0%
Other 3.1 KiB 0%
Other 1.0 KiB 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

F
JS Bundles
Action
51 scripts, 803 KB unused
FIX
51 scripts, 803 KB unused
Warning::
https://ac0c8b7050ff.bac22831.eu-west-1.token.awsw...: 278 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://brill.com/skin/63bd09df2089723e864c7521e86...: 123 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://brill.com/modules.gz/baseapp/combined-skin...: 107 KB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7D0P...: 68 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WF6...: 61 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 803 KB
803 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ac0c8b7050ff.bac22831.eu-west-1.token.awswaf.com/ac0c8b7050ff/53829109e090/be752f2dce0c/challenge.js502 KB278 KB (55%)✓3rd
https://brill.com/skin/63bd09df2089723e864c7521e8629d62162546e6/js/skin-sync.min.js187 KB123 KB (66%)✓1st
https://brill.com/modules.gz/baseapp/combined-skin-min.js126 KB107 KB (85%)✓1st
https://www.googletagmanager.com/gtag/js?id=G-7D0PQT340Y&cx=c&gtm=4e64h1173 KB68 KB (39%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WF6V4F143 KB61 KB (43%)✓3rd
https://brill.com/modules.gz/jquery-ui.js67 KB59 KB (88%)✓1st
https://brill.com/assets/vendor/z5ec668da/jquery-ui/jquery-ui.min.js67 KB57 KB (86%)✓1st
https://brill.com/assets/meta/z48b58321/tapestry5/scriptaculous_1_9_0/prototype.js46 KB30 KB (68%)✗1st
https://brill.com/assets/meta/z8c546d97/tapestry5/jquery.js87 KB21 KB (25%)✗1st
https://brill.com/assets/responsive/zf0c61771/js/configurable-layout.js7 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

D
Page Weight Inventory
Action
112 resources · 5.1 MB · 803 KB savings available
FIX
112 resources · 5.1 MB · 803 KB savings available
Warning::
Page weight 4.1 MB over 1MB target
Got: 5.1 MB Expected: ≤ 1 MB
Info::
~803 KB of savings available
Info::
23 third-party resources (18% of weight)
Info::
5 resources over 200KB
112 resources · 5.1 MiB · 23 third-party 4.1 MiB over 1MB target
Image 57% · 2.9 MiB
JavaScript 31% · 1.6 MiB
Font 8% · 425.2 KiB
CSS 3% · 160.5 KiB
Document 0% · 23.6 KiB
Other 0% · 4.2 KiB

~803.0 KiB of savings available

Remove unused JavaScript: 803.0 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
36 images, 0 KB saveable
REVIEW
36 images, 0 KB saveable
Warning::
https://brill.com/fileasset/home/boehlausquare.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/fileasset/home/nijhoffsquare.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F69440&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F68275&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F71591&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/fileasset/home/wageningensquare.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F70093&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F63085&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/fileasset/home/finksquare.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F69253&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F70910&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F70161&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/cover/default?doc=%2Fcover%2Fdef... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F63041&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/fileasset//fileasset/appbar/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/fileasset/home/home_dlcc.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/fileasset/home/home_hero_default... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/fileasset/home/mentissquare.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F70396&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/fileasset/home/home_hero_whm2026... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/fileasset/home/vrsquare.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F71320&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F70904&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F71306&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F70788&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F64847&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F71173&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/fileasset/home/schoeninghsquare.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F69969&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/fileasset/home/home_hero_5.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/fileasset/home/brillsquare.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F60070&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F68730&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brill.com/coverimage?doc=%2Ftitle%2F70521&... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
36 images 2.9 MB
0 oversized -0 KB
15 legacy format
34 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

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

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
782ms total JS execution
REVIEW
782ms total JS execution
Info::
https://ac0c8b7050ff.bac22831.eu-west-1.token.awsw...: 179ms CPU time
Info::
Unattributable: 152ms CPU time
Info::
https://brill.com/: 126ms CPU time
Info::
https://brill.com/skin/63bd09df2089723e864c7521e86...: 99ms CPU time
Info::
https://brill.com/modules.gz/baseapp/combined-skin...: 94ms CPU time
Warning::
Third-party scripts: 463ms (59% of total)

Main Thread Breakdown

Script Evaluation 57% Other 16% Style & Layout 10% Script Parsing & Compilation 10% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://ac0c8b7050ff.bac22831.eu-west-1.token.awswaf.com/ac0c8b7050ff/53829109e090/be752f2dce0c/challenge.js179ms137ms25ms3rd
Unattributable152ms29ms0ms3rd
https://brill.com/126ms11ms3ms1st
https://brill.com/skin/63bd09df2089723e864c7521e8629d62162546e6/js/skin-sync.min.js99ms78ms13ms1st
https://brill.com/modules.gz/baseapp/combined-skin-min.js94ms56ms8ms1st
https://www.googletagmanager.com/gtag/js?id=G-7D0PQT340Y&cx=c&gtm=4e64h167ms57ms10ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WF6V4F64ms51ms9ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
18% third-party, 0 ms blocking
PASS
18% third-party, 0 ms blocking
Info::
Third-party code accounts for 18% of page weight (919.8 KiB of 5.1 MiB)
Info::
Third-party blocking time is low (0 ms)
82%
18%
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
3 fonts (425 KB)
PASS
3 fonts (425 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

425 KB total

Render-blocking

0

of 3

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 1.4 s LCP 3.9 shttps://brill.com/skin/63bd09df2089723e864c7521e8629d62162546e6/fonts/brill/Brill-Roman.woff2Brill-Roman.woff2 https://brill.com/skin/63bd09df2089723e864c7521e8629d62162546e6/fonts/brill/Brill-Roman.woff2 — 333.1 KiB — 246 ms — font-display: swaphttps://brill.com/skin/63bd09df2089723e864c7521e8629d62162546e6/fonts/pf2-icons.woff2pf2-icons.woff2 https://brill.com/skin/63bd09df2089723e864c7521e8629d62162546e6/fonts/pf2-icons.woff2 — 48.1 KiB — 203 ms — font-display: swaphttps://brill.com/skin/63bd09df2089723e864c7521e8629d62162546e6/fonts/MaterialIcons-Regular.woff2MaterialIcons-Regular.w... https://brill.com/skin/63bd09df2089723e864c7521e8629d62162546e6/fonts/MaterialIcons-Regular.woff2 — 44.0 KiB — 45 ms — font-display: swap
Brill-Roman.woff2 woff2 swap
Size 333 KB
Load time 246 ms
Start 2.2 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
pf2-icons.woff2 woff2 swap
Size 48 KB
Load time 203 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
MaterialIcons-Regular.w... woff2 swap
Size 44 KB
Load time 45 ms
Start 3.1 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 ~167 KB and ~334 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
112 requests over 3101ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.4 s LCP 3.9 shttps://brill.com// https://brill.com/ — 202 — 2.3 KiB — 113 ms — h2https://ac0c8b7050ff.bac22831.eu-west-1.token.awswaf.com/ac0c8b7050ff/53829109e090/be752f2dce0c/challenge.jsac0c8b7050ff.bac22831.eu-west-1.tok... https://ac0c8b7050ff.bac22831.eu-west-1.token.awswaf.com/ac0c8b7050ff/53829109e090/be752f2dce0c/challenge.js — 200 — 501.6 KiB — 64 ms — h2https://ac0c8b7050ff.bac22831.eu-west-1.token.awswaf.com/ac0c8b7050ff/53829109e090/be752f2dce0c/inputs?client=browserac0c8b7050ff.bac22831.eu-west-1.tok... https://ac0c8b7050ff.bac22831.eu-west-1.token.awswaf.com/ac0c8b7050ff/53829109e090/be752f2dce0c/inputs?client=browser — 200 — 829 B — 121 ms — h3https://brill.com/favicon.ico/favicon.ico https://brill.com/favicon.ico — 404 — 714 B — 49 ms — h2https://ac0c8b7050ff.bac22831.eu-west-1.token.awswaf.com/ac0c8b7050ff/53829109e090/be752f2dce0c/mp_verifyac0c8b7050ff.bac22831.eu-west-1.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
59% of JavaScript execution is third-party
First-party Third-party 463ms · 818KB · $6/mo
ac0c8b7050ff.bac22831.eu-west-1.token.awswaf.com
Other
Optional
Execution 179ms
Transfer 502 KB
Unused 55%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 152ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 67ms
Transfer 173 KB
Unused 39%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 64ms
Transfer 143 KB
Unused 43%
Monthly Cost $1/mo

59% 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 ac0c8b7050ff.bac22831.eu-west-1.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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