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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
38
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
62
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.

2.26 s

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

8.91 s

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

424 ms

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

0.685

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

3.21 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.

8.91 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
8 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 49 requests
FIX
2.5 MB transferred, 49 requests
Warning::
Page weighs 4.0 MB (2.5 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
Info::
49 HTTP requests
Info::
Estimated 0.52 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
49 requests
0.52 g CO2 per page load
Images 1.9 MiB 78%
JavaScript 408.3 KiB 16%
Fonts 82.3 KiB 3%
CSS 37.7 KiB 1%
Other 29.0 KiB 1%
HTML 4.8 KiB 0%
Other 3.2 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

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 (2.5 MiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
49 resources · 2.5 MB · 184 KB savings available
FIX
49 resources · 2.5 MB · 184 KB savings available
Warning::
Page weight 1.5 MB over 1MB target
Got: 2.5 MB Expected: ≤ 1 MB
Info::
~184 KB of savings available
Warning::
48 third-party resources (100% of weight)
Info::
4 resources over 200KB
49 resources · 2.5 MiB · 48 third-party 1.5 MiB over 1MB target
Image 79% · 2.0 MiB
JavaScript 16% · 408.3 KiB
Font 3% · 82.3 KiB
CSS 1% · 37.7 KiB
Document 0% · 5.5 KiB
Other 0% · 3.9 KiB

~183.9 KiB of savings available

Remove unused JavaScript: 183.9 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Warning::
https://www.doxygen.nl/assets/cross_referencing_de... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doxygen.nl/assets/multiple_formats.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doxygen.nl/assets/markdown_demo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doxygen.nl/assets/cplusplus_image_pers... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doxygen.nl/assets/diagrams_demo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doxygen.nl/assets/config_demo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
20 images 1.9 MB
0 oversized -0 KB
18 legacy format
6 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

C
JS Execution Cost
Action
1618ms total JS execution
REVIEW
1618ms total JS execution
Warning::
Unattributable: 388ms CPU time
Warning::
https://www.doxygen.nl/: 370ms CPU time
Warning::
https://fundingchoicesmessages.google.com/f/AGSKWx...: 279ms CPU time
Info::
https://fundingchoicesmessages.google.com/i/ca-pub...: 228ms CPU time
Info::
https://pagead2.googlesyndication.com/pagead/manag...: 161ms CPU time
Warning::
Third-party scripts: 1618ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 26% Style & Layout 19% Script Parsing & Compilation 8% Parse HTML & CSS 7% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable388ms8ms0ms3rd
https://www.doxygen.nl/370ms3ms1ms3rd
https://fundingchoicesmessages.google.com/f/AGSKWxX6TS4Q6hjNPUR4-kts30aUYoPd5ZJxDPjKXo8VA7Ukn0eUWDyW38GbnAPAVrr0Zq4zfYxFz6ZW9BaW2uRZPvR__sY4Q0XyeSI2uuZJ1MNuV4gCxRi0hXR6A_MCCF4YTkkg27psoA==?fccs=W251bGwsbnVsbCxudWxsLG51bGwsbnVsbCxudWxsLFsxNzc2ODAxNzY1LDYyMDAwMDAwMF0sbnVsbCxudWxsLG51bGwsW251bGwsWzddXSwiaHR0cHM6Ly93d3cuZG94eWdlbi5ubC8iLG51bGwsW1s4LCJEc0tHTi1xcWZyUSJdLFs5LCJlbi1VUyJdLFsxOCwiW1tbbnVsbCw2MDFdXV0iXSxbMzUsIjE3NzY4MDE3NjUiXSxbMTksIjEiXSxbMTcsIlswXSJdLFsyNCwiIl0sWzI5LCJmYWxzZSJdXV0279ms129ms39ms3rd
https://fundingchoicesmessages.google.com/i/ca-pub-1917318012276499?href=https%3A%2F%2Fwww.doxygen.nl&ers=2228ms201ms23ms3rd
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604160101/show_ads_impl_fy2021.js161ms115ms41ms3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1917318012276499140ms114ms17ms3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451653ms45ms3ms3rd
C
JS Bundles
Action
9 scripts, 184 KB unused
REVIEW
9 scripts, 184 KB unused
Warning::
https://pagead2.googlesyndication.com/pagead/manag...: 148 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://fundingchoicesmessages.google.com/i/ca-pub...: 36 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 184 KB
184 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604160101/show_ads_impl_fy2021.js178 KB148 KB (83%)✓3rd
https://fundingchoicesmessages.google.com/i/ca-pub-1917318012276499?href=https%3A%2F%2Fwww.doxygen.nl&ers=270 KB36 KB (52%)✓3rd
https://www.doxygen.nl/bootstrap.min.js16 KB—✓3rd
https://www.doxygen.nl/tocbot.min.js4 KB—✓3rd
https://www.doxygen.nl/doxygen_homepage.js1 KB—✓3rd
https://buttons.github.io/buttons.js7 KB—✓3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-191731801227649955 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://fundingchoicesmessages.google.com/f/AGSKWxX6TS4Q6hjNPUR4-kts30aUYoPd5ZJxDPjKXo8VA7Ukn0eUWDyW38GbnAPAVrr0Zq4zfYxFz6ZW9BaW2uRZPvR__sY4Q0XyeSI2uuZJ1MNuV4gCxRi0hXR6A_MCCF4YTkkg27psoA==?fccs=W251bGwsbnVsbCxudWxsLG51bGwsbnVsbCxudWxsLFsxNzc2ODAxNzY1LDYyMDAwMDAwMF0sbnVsbCxudWxsLG51bGwsW251bGwsWzddXSwiaHR0cHM6Ly93d3cuZG94eWdlbi5ubC8iLG51bGwsW1s4LCJEc0tHTi1xcWZyUSJdLFs5LCJlbi1VUyJdLFsxOCwiW1tbbnVsbCw2MDFdXV0iXSxbMzUsIjE3NzY4MDE3NjUiXSxbMTksIjEiXSxbMTcsIlswXSJdLFsyNCwiIl0sWzI5LCJmYWxzZSJdXV068 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

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 (82 KB)
PASS
3 fonts (82 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

82 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 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.3 s LCP 8.9 shttps://fonts.gstatic.com/s/opensans/v13/cJZKeOuBrn4kERxqtaUH3T8E0i7KZn-EPnyo3HZu7kw.woffcJZKeOuBrn4kERxqtaUH3T8... https://fonts.gstatic.com/s/opensans/v13/cJZKeOuBrn4kERxqtaUH3T8E0i7KZn-EPnyo3HZu7kw.woff — 19.8 KiB — 95 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v13/DXI1ORHCpsQm3Vp6mXoaTXhCUOGz7vYGh680lGh-uXM.woffDXI1ORHCpsQm3Vp6mXoaTXh... https://fonts.gstatic.com/s/opensans/v13/DXI1ORHCpsQm3Vp6mXoaTXhCUOGz7vYGh680lGh-uXM.woff — 20.4 KiB — 97 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.1 KiB — 33 ms — font-display: swap
cJZKeOuBrn4kERxqtaUH3T8... woff swap
Size 20 KB
Load time 95 ms
Start 339 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
DXI1ORHCpsQm3Vp6mXoaTXh... woff swap
Size 20 KB
Load time 97 ms
Start 340 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 33 ms
Start 977 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 ~12 KB and ~24 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
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
49 requests over 1154ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.3 s LCP 8.9 shttps://doxygen.org// https://doxygen.org/ — 301 — 517 B — 107 ms — h2http://www.doxygen.nl/www.doxygen.nl/ http://www.doxygen.nl/ — 307 — 0 B — 1 ms — http/1.1https://www.doxygen.nl/www.doxygen.nl/ https://www.doxygen.nl/ — 200 — 4.8 KiB — 130 ms — h2https://www.doxygen.nl/bootstrap.min.csswww.doxygen.nl/bootstrap.min.css https://www.doxygen.nl/bootstrap.min.css — 200 — 28.0 KiB — 32 ms — h2https://www.doxygen.nl/tocbot.min.csswww.doxygen.nl/tocbot.min.css https://www.doxygen.nl/tocbot.min.css — 200 — 690 B — 26 ms — h2https://www.doxygen.nl/doxygen_homepage.csswww.doxygen.nl/doxygen_homepage.css https://www.doxygen.nl/doxygen_homepage.css — 200 — 2.4 KiB — 27 ms — h2https://www.paypal.com/en_GB/i/btn/btn_donate_SM.gifwww.paypal.com/en_GB/i/btn/btn_dona... https://www.paypal.com/en_GB/i/btn/btn_donate_SM.gif — 301 — 922 B — 275 ms — h2https://www.doxygen.nl/assets/DoxygenExample_dark.pngwww.doxygen.nl/assets/DoxygenExampl... https://www.doxygen.nl/assets/DoxygenExample_dark.png — 200 — 442.9 KiB — 110 ms — h2https://www.doxygen.nl/assets/DoxygenExample_light.pngwww.doxygen.nl/assets/DoxygenExampl... https://www.doxygen.nl/assets/DoxygenExample_light.png — 200 — 440.7 KiB — 115 ms — h2https://www.doxygen.nl/assets/multiple_formats.svgwww.doxygen.nl/assets/multiple_form... https://www.doxygen.nl/assets/multiple_formats.svg — 200 — 7.3 KiB — 109 ms — h2https://www.doxygen.nl/assets/markdown_demo.pngwww.doxygen.nl/assets/markdown_demo... https://www.doxygen.nl/assets/markdown_demo.png — 200 — 121.5 KiB — 109 ms — h2https://www.doxygen.nl/bootstrap.min.jswww.doxygen.nl/bootstrap.min.js https://www.doxygen.nl/bootstrap.min.js — 200 — 16.0 KiB — 82 ms — h2https://www.doxygen.nl/tocbot.min.jswww.doxygen.nl/tocbot.min.js https://www.doxygen.nl/tocbot.min.js — 200 — 3.8 KiB — 111 ms — h2https://www.doxygen.nl/doxygen_homepage.jswww.doxygen.nl/doxygen_homepage.js https://www.doxygen.nl/doxygen_homepage.js — 200 — 537 B — 111 ms — h2https://buttons.github.io/buttons.jsbuttons.github.io/buttons.js https://buttons.github.io/buttons.js — 200 — 7.0 KiB — 59 ms — h2https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1917318012276499pagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1917318012276499 — 200 — 54.6 KiB — 155 ms — h3https://www.doxygen.nl/assets/doxygen.svgwww.doxygen.nl/assets/doxygen.svg https://www.doxygen.nl/assets/doxygen.svg — 200 — 3.9 KiB — 109 ms — h2https://www.doxygen.nl/assets/download.svgwww.doxygen.nl/assets/download.svg https://www.doxygen.nl/assets/download.svg — 200 — 527 B — 110 ms — h2https://www.doxygen.nl/assets/cplusplus_image_perspective.pngwww.doxygen.nl/assets/cplusplus_ima... https://www.doxygen.nl/assets/cplusplus_image_perspective.png — 200 — 529.2 KiB — 122 ms — h2https://www.doxygen.nl/assets/cross_referencing_demo.pngwww.doxygen.nl/assets/cross_referen... https://www.doxygen.nl/assets/cross_referencing_demo.png — 200 — 139.0 KiB — 119 ms — h2https://www.doxygen.nl/assets/diagrams_demo.svgwww.doxygen.nl/assets/diagrams_demo... https://www.doxygen.nl/assets/diagrams_demo.svg — 200 — 3.1 KiB — 116 ms — h2https://www.doxygen.nl/assets/config_demo.pngwww.doxygen.nl/assets/config_demo.p... https://www.doxygen.nl/assets/config_demo.png — 200 — 260.7 KiB — 123 ms — h2https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 104 ms — h2data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='…www.w3.org/2000/svg' viewBox='0 0 3... data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' …www.w3.org/2000/svg' viewBox='-4 -4... data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' … — 200 — 0 B — 0 ms — datahttps://www.doxygen.nl/assets/documents.svgwww.doxygen.nl/assets/documents.svg https://www.doxygen.nl/assets/documents.svg — 200 — 1.1 KiB — 43 ms — h3https://www.doxygen.nl/assets/markdown.svgwww.doxygen.nl/assets/markdown.svg https://www.doxygen.nl/assets/markdown.svg — 200 — 993 B — 41 ms — h3https://www.doxygen.nl/assets/cplusplus.svgwww.doxygen.nl/assets/cplusplus.svg https://www.doxygen.nl/assets/cplusplus.svg — 200 — 1.1 KiB — 43 ms — h3https://www.doxygen.nl/assets/cross_referencing.svgwww.doxygen.nl/assets/cross_referen... https://www.doxygen.nl/assets/cross_referencing.svg — 200 — 2.1 KiB — 41 ms — h3https://www.doxygen.nl/assets/diagrams.svgwww.doxygen.nl/assets/diagrams.svg https://www.doxygen.nl/assets/diagrams.svg — 200 — 856 B — 39 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.3 s LCP 8.9 shttps://doxygen.org// https://doxygen.org/ — 301 — 517 B — 107 ms — h2http://www.doxygen.nl/www.doxygen.nl/ http://www.doxygen.nl/ — 307 — 0 B — 1 ms — http/1.1https://www.doxygen.nl/www.doxygen.nl/ https://www.doxygen.nl/ — 200 — 4.8 KiB — 130 ms — h2https://www.doxygen.nl/bootstrap.min.csswww.doxygen.nl/bootstrap.min.css https://www.doxygen.nl/bootstrap.min.css — 200 — 28.0 KiB — 32 ms — h2https://www.doxygen.nl/tocbot.min.csswww.doxygen.nl/tocbot.min.css https://www.doxygen.nl/tocbot.min.css — 200 — 690 B — 26 ms — h2https://www.doxygen.nl/doxygen_homepage.csswww.doxygen.nl/doxygen_homepage.css https://www.doxygen.nl/doxygen_homepage.css — 200 — 2.4 KiB — 27 ms — h2https://www.paypal.com/en_GB/i/btn/btn_donate_SM.gifwww.paypal.com/en_GB/i/btn/btn_dona... https://www.paypal.com/en_GB/i/btn/btn_donate_SM.gif — 301 — 922 B — 275 ms — h2https://www.doxygen.nl/assets/DoxygenExample_dark.pngwww.doxygen.nl/assets/DoxygenExampl... https://www.doxygen.nl/assets/DoxygenExample_dark.png — 200 — 442.9 KiB — 110 ms — h2https://www.doxygen.nl/assets/DoxygenExample_light.pngwww.doxygen.nl/assets/DoxygenExampl... https://www.doxygen.nl/assets/DoxygenExample_light.png — 200 — 440.7 KiB — 115 ms — h2https://www.doxygen.nl/assets/multiple_formats.svgwww.doxygen.nl/assets/multiple_form... https://www.doxygen.nl/assets/multiple_formats.svg — 200 — 7.3 KiB — 109 ms — h2https://www.doxygen.nl/assets/markdown_demo.pngwww.doxygen.nl/assets/markdown_demo... https://www.doxygen.nl/assets/markdown_demo.png — 200 — 121.5 KiB — 109 ms — h2https://www.doxygen.nl/bootstrap.min.jswww.doxygen.nl/bootstrap.min.js https://www.doxygen.nl/bootstrap.min.js — 200 — 16.0 KiB — 82 ms — h2https://www.doxygen.nl/tocbot.min.jswww.doxygen.nl/tocbot.min.js https://www.doxygen.nl/tocbot.min.js — 200 — 3.8 KiB — 111 ms — h2https://www.doxygen.nl/doxygen_homepage.jswww.doxygen.nl/doxygen_homepage.js https://www.doxygen.nl/doxygen_homepage.js — 200 — 537 B — 111 ms — h2https://buttons.github.io/buttons.jsbuttons.github.io/buttons.js https://buttons.github.io/buttons.js — 200 — 7.0 KiB — 59 ms — h2https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1917318012276499pagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1917318012276499 — 200 — 54.6 KiB — 155 ms — h3https://www.doxygen.nl/assets/doxygen.svgwww.doxygen.nl/assets/doxygen.svg https://www.doxygen.nl/assets/doxygen.svg — 200 — 3.9 KiB — 109 ms — h2https://www.doxygen.nl/assets/download.svgwww.doxygen.nl/assets/download.svg https://www.doxygen.nl/assets/download.svg — 200 — 527 B — 110 ms — h2https://www.doxygen.nl/assets/cplusplus_image_perspective.pngwww.doxygen.nl/assets/cplusplus_ima... https://www.doxygen.nl/assets/cplusplus_image_perspective.png — 200 — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1618ms · 386KB · €18/mo
Unattributable
Other
Costly
Execution 388ms
Transfer 0 KB
Monthly Cost €4/mo
www.doxygen.nl
Other
Costly
Execution 370ms
Transfer 5 KB
Monthly Cost €4/mo
fundingchoicesmessages.google.com
Other
Costly
Execution 279ms
Transfer 68 KB
Monthly Cost €3/mo
fundingchoicesmessages.google.com
Other
Costly
Execution 228ms
Transfer 70 KB
Unused 52%
Monthly Cost €2/mo
pagead2.googlesyndication.com
Other
Optional
Execution 161ms
Transfer 178 KB
Unused 83%
Monthly Cost €2/mo
pagead2.googlesyndication.com
Other
Optional
Execution 140ms
Transfer 55 KB
Monthly Cost €2/mo
static.cloudflareinsights.com
Other
Optional
Execution 53ms
Transfer 11 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 388ms and costs ~€4/month
  • www.doxygen.nl adds 370ms and costs ~€4/month
  • fundingchoicesmessages.google.com adds 279ms and costs ~€3/month
  • fundingchoicesmessages.google.com adds 228ms and costs ~€2/month

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

Why this matters

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

Learn more ▾

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

Source: web.dev

Unattributable takes 388ms 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

www.doxygen.nl takes 370ms 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

fundingchoicesmessages.google.com takes 279ms 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

fundingchoicesmessages.google.com takes 228ms 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

52% of fundingchoicesmessages.google.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

83% of pagead2.googlesyndication.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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