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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
72
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.
91
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.

1.11 s

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

6.31 s

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

28 ms

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

0.003

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

1.64 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

6.40 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
7.2 MB transferred, 76 requests
FIX
7.2 MB transferred, 76 requests
Critical::
Page weighs 9.5 MB (7.2 MB transferred)
Warning::
Images are 5.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.6 MB
Info::
Fonts are 866 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 866 KB
Warning::
JavaScript is 630 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 630 KB
Info::
76 HTTP requests
Info::
Estimated 1.5 g CO2 per page load
7.2 MB / 2.4 MB budget
7.2 MB transferred
76 requests
1.5 g CO2 per page load
Images 5.6 MiB 77%
Fonts 865.9 KiB 12%
JavaScript 629.5 KiB 9%
CSS 120.4 KiB 2%
Other 58.0 KiB 1%
HTML 23.2 KiB 0%
Other 1.9 KiB 0%
0 2.4 MB 4.9 MB
Over budget

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

Why this matters

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

Source: web.dev

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

Why this matters

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

Source: web.dev font loading

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

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 (7.2 MiB of 7.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
18 scripts, 209 KB unused
FIX
18 scripts, 209 KB unused
Warning::
https://www.googletagmanager.com/gtag/destination?...: 73 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PMN...: 69 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://badge.dimensions.ai/badge.js: 24 KB unused (29%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://badge.dimensions.ai/badge.js: unminified — 19 KB could be saved
Warning::
https://cdn.foxycart.com/checkout.degruyterbrill.c...: 23 KB unused (28%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.degruyterbrill.com/assets/javascripts/...: 21 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 209 KB
209 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/destination?id=G-0C5LEN255K&cx=c&gtm=4e64k0177 KB73 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PMNKTQ5&gtm_auth=JraP3pn8iVUkqNIGYl03AA&gtm_preview=env-2170 KB69 KB (41%)✓3rd
https://badge.dimensions.ai/badge.js81 KB24 KB (29%)✗3rd
https://cdn.foxycart.com/checkout.degruyterbrill.com/foxycart.with-jquery.min.1776800679.js82 KB23 KB (28%)✓3rd
https://www.degruyterbrill.com/assets/javascripts/835e77a694cc46b66f3812640c574eef-main.js34 KB21 KB (62%)✓3rd
https://www.degruyterbrill.com/assets/javascripts/f62fc03e44df2f5efad9611016f07366-custom-elements.min.js7 KB—✓3rd
https://www.degruyterbrill.com/assets/javascripts/02f217ac44f30e20572ec9be327266f9-clipboard-polyfill.js3 KB—✓3rd
https://www.degruyterbrill.com/assets/javascripts/f4a7cebacca43a770afd837b68a7eed8-autoComplete.min.js4 KB—✓3rd
https://www.degruyterbrill.com/assets/javascripts/dgbrill/dba8b7bd2d21c1deeda3639cce555347-dgb-main.js3 KB—✓3rd
https://www.degruyterbrill.com/assets/javascripts/dgbrill/4bdc08facd85c1ac420c404f6b733d88-footer.js2 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

D
Page Weight Inventory
Action
76 resources · 7.2 MB · 209 KB savings available
FIX
76 resources · 7.2 MB · 209 KB savings available
Warning::
Page weight 6.2 MB over 1MB target
Got: 7.2 MB Expected: ≤ 1 MB
Info::
~209 KB of savings available
Warning::
75 third-party resources (100% of weight)
Info::
6 resources over 200KB
76 resources · 7.2 MiB · 75 third-party 6.2 MiB over 1MB target
Image 77% · 5.6 MiB
Font 12% · 865.9 KiB
JavaScript 9% · 629.5 KiB
CSS 2% · 120.4 KiB
Document 1% · 80.1 KiB
Other 0% · 1.2 KiB

~208.8 KiB of savings available

Remove unused JavaScript: 208.8 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
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/assets/images/blog-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/assets/images/partn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/seri... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/seri... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/assets/images/open-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/assets/images/blog-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/seri... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/seri... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/document/cover/isbn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/assets/images/partn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.degruyterbrill.com/assets/images/partn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35 images 5.6 MB
0 oversized -0 KB
34 legacy format
26 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

B
JS Execution Cost
649ms total JS execution
REVIEW
649ms total JS execution
Info::
https://www.degruyterbrill.com/assets/javascripts/...: 238ms CPU time
Info::
Unattributable: 149ms CPU time
Info::
https://www.degruyterbrill.com/: 99ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PMN...: 83ms CPU time
Info::
https://www.googletagmanager.com/gtag/destination?...: 79ms CPU time
Warning::
Third-party scripts: 649ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Other 35% Style & Layout 14% Script Parsing & Compilation 6% Rendering 6% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.degruyterbrill.com/assets/javascripts/835e77a694cc46b66f3812640c574eef-main.js238ms81ms0ms3rd
Unattributable149ms7ms0ms3rd
https://www.degruyterbrill.com/99ms4ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PMNKTQ5&gtm_auth=JraP3pn8iVUkqNIGYl03AA&gtm_preview=env-283ms70ms12ms3rd
https://www.googletagmanager.com/gtag/destination?id=G-0C5LEN255K&cx=c&gtm=4e64k079ms62ms12ms3rd
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
12 fonts (866 KB)
PASS
12 fonts (866 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

866 KB total

Render-blocking

0

of 12

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 5.0 s 6.0 s FCP 1.1 s LCP 6.3 shttps://www.degruyterbrill.com/assets/fonts/montserrat-v15-latin-ext_cyrillic-ext-regular.woff2montserrat-v15-latin-ex... https://www.degruyterbrill.com/assets/fonts/montserrat-v15-latin-ext_cyrillic-ext-regular.woff2 — 52.0 KiB — 188 ms — font-display: swaphttps://www.degruyterbrill.com/assets/fonts/montserrat-v25-latin-ext_cyrillic-ext-500.woff2montserrat-v25-latin-ex... https://www.degruyterbrill.com/assets/fonts/montserrat-v25-latin-ext_cyrillic-ext-500.woff2 — 39.9 KiB — 82 ms — font-display: swaphttps://www.degruyterbrill.com/assets/fonts/montserrat-v15-latin-ext_cyrillic-ext-700.woff2montserrat-v15-latin-ex... https://www.degruyterbrill.com/assets/fonts/montserrat-v15-latin-ext_cyrillic-ext-700.woff2 — 52.0 KiB — 193 ms — font-display: swaphttps://www.degruyterbrill.com/assets/fonts/merriweather-v30-latin-ext_cyrillic-ext-300.woff2merriweather-v30-latin-... https://www.degruyterbrill.com/assets/fonts/merriweather-v30-latin-ext_cyrillic-ext-300.woff2 — 57.0 KiB — 192 ms — font-display: swaphttps://www.degruyterbrill.com/assets/fonts/merriweather-v22-latin-ext_cyrillic-ext-regular.woff2merriweather-v22-latin-... https://www.degruyterbrill.com/assets/fonts/merriweather-v22-latin-ext_cyrillic-ext-regular.woff2 — 57.4 KiB — 195 ms — font-display: swaphttps://www.degruyterbrill.com/assets/fonts/merriweather-v22-latin-ext_cyrillic-ext-700.woff2merriweather-v22-latin-... https://www.degruyterbrill.com/assets/fonts/merriweather-v22-latin-ext_cyrillic-ext-700.woff2 — 55.7 KiB — 193 ms — font-display: swaphttps://www.degruyterbrill.com/assets/stylesheets/fontawesome.woff2fontawesome.woff2 https://www.degruyterbrill.com/assets/stylesheets/fontawesome.woff2 — 11.4 KiB — 145 ms — font-display: swaphttps://www.degruyterbrill.com/assets/fonts/InstrumentSans-Regular.ttfInstrumentSans-Regular.ttf https://www.degruyterbrill.com/assets/fonts/InstrumentSans-Regular.ttf — 35.4 KiB — 181 ms — font-display: swaphttps://www.degruyterbrill.com/assets/fonts/InstrumentSans-Medium.ttfInstrumentSans-Medium.ttf https://www.degruyterbrill.com/assets/fonts/InstrumentSans-Medium.ttf — 36.2 KiB — 180 ms — font-display: swaphttps://www.degruyterbrill.com/assets/fonts/InstrumentSans-SemiBold.ttfInstrumentSans-SemiBold... https://www.degruyterbrill.com/assets/fonts/InstrumentSans-SemiBold.ttf — 36.6 KiB — 182 ms — font-display: swaphttps://www.degruyterbrill.com/assets/fonts/HafferVF.woff2HafferVF.woff2 https://www.degruyterbrill.com/assets/fonts/HafferVF.woff2 — 397.0 KiB — 171 ms — font-display: swaphttps://www.degruyterbrill.com/assets/fonts/RecklessNeue-Book.woff2RecklessNeue-Book.woff2 https://www.degruyterbrill.com/assets/fonts/RecklessNeue-Book.woff2 — 35.3 KiB — 156 ms — font-display: swap
montserrat-v15-latin-ex... woff2 swap
Size 52 KB
Load time 188 ms
Start 244 ms
Risk FOUT — text flashes from fallback to web font
montserrat-v25-latin-ex... woff2 swap
Size 40 KB
Load time 82 ms
Start 245 ms
Risk FOUT — text flashes from fallback to web font
montserrat-v15-latin-ex... woff2 swap
Size 52 KB
Load time 193 ms
Start 246 ms
Risk FOUT — text flashes from fallback to web font
merriweather-v30-latin-... woff2 swap
Size 57 KB
Load time 192 ms
Start 246 ms
Risk FOUT — text flashes from fallback to web font
merriweather-v22-latin-... woff2 swap
Size 57 KB
Load time 195 ms
Start 246 ms
Risk FOUT — text flashes from fallback to web font
merriweather-v22-latin-... woff2 swap
Size 56 KB
Load time 193 ms
Start 247 ms
Risk FOUT — text flashes from fallback to web font
fontawesome.woff2 woff2 swap
Size 11 KB
Load time 145 ms
Start 247 ms
Risk FOUT — text flashes from fallback to web font
InstrumentSans-Regular.ttf ttf swap
Size 35 KB
Load time 181 ms
Start 248 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
InstrumentSans-Medium.ttf ttf swap
Size 36 KB
Load time 180 ms
Start 249 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
InstrumentSans-SemiBold... ttf swap
Size 37 KB
Load time 182 ms
Start 249 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
HafferVF.woff2 woff2 swap
Size 397 KB
Load time 171 ms
Start 532 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
RecklessNeue-Book.woff2 woff2 swap
Size 35 KB
Load time 156 ms
Start 532 ms
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 ~231 KB and ~462 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
76 requests over 1399ms
INFO
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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 649ms · 404KB · $4/mo
www.degruyterbrill.com
Other
Costly
Execution 238ms
Transfer 34 KB
Unused 62%
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 149ms
Transfer 0 KB
Monthly Cost $1/mo
www.degruyterbrill.com
Other
Optional
Execution 99ms
Transfer 23 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 83ms
Transfer 170 KB
Unused 41%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 79ms
Transfer 177 KB
Unused 41%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • www.degruyterbrill.com adds 238ms and costs ~$1/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.degruyterbrill.com takes 238ms 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

62% of www.degruyterbrill.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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