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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
40
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.
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.

12.93 s

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

34.11 s

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

116 ms

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

0.283

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

12.93 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.

34.18 s

Page Load Progression

407 ms
814 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.3 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
5.6 MB transferred, 85 requests
FIX
5.6 MB transferred, 85 requests
Critical::
Page weighs 5.7 MB (5.6 MB transferred)
Warning::
JavaScript is 2.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.9 MB
Warning::
Images are 2.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.2 MB
Info::
CSS is 364 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 364 KB
Info::
85 HTTP requests
Info::
Estimated 1.2 g CO2 per page load
5.6 MB / 2.4 MB budget
5.6 MB transferred
85 requests
1.2 g CO2 per page load
JavaScript 2.9 MiB 51%
Images 2.2 MiB 39%
CSS 364.3 KiB 6%
Fonts 184.3 KiB 3%
Other 34.2 KiB 1%
HTML 26.4 KiB 0%
Other 5.2 KiB 0%
Other 2.3 KiB 0%
Other 235 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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 (5.6 MiB of 5.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3904ms total JS execution
FIX
3904ms total JS execution
Warning::
https://download.belastingdienst.nl/assets/bold/bl...: 1911ms CPU time
Warning::
https://www.belastingdienst.nl/wps/wcm/connect/nl/...: 730ms CPU time
Warning::
Unattributable: 658ms CPU time
Info::
https://pwa001.belastingdienst.nl/adobe/db1f754ddf...: 136ms CPU time
Info::
https://try.abtasty.com/e7e9d856425677bf0f1ca47515...: 99ms CPU time
Warning::
Third-party scripts: 3904ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 20% Parse HTML & CSS 10% Rendering 8% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/bldc-sanitizer-a23b72b1.js1911ms1504ms0ms3rd
https://www.belastingdienst.nl/wps/wcm/connect/nl/home/home730ms8ms2ms3rd
Unattributable658ms55ms0ms3rd
https://pwa001.belastingdienst.nl/adobe/db1f754ddf26/345c851e2a0e/launch-da94bc0c02f3.min.js136ms112ms19ms3rd
https://try.abtasty.com/e7e9d856425677bf0f1ca47515bfcc27/main.dc98100278fab53404b3.js99ms88ms10ms3rd
https://www.belastingdienst.nl/bld-assets/bld/belastingdienst.js98ms61ms7ms3rd
https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/index-36dcd2a1.js85ms73ms1ms3rd
https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/bldc-icon.entry.js81ms3ms0ms3rd
https://www.belastingdienst.nl/bld-assets/packery/packery.pkgd.min.js55ms46ms3ms3rd
https://www.belastingdienst.nl/bld-assets/jquery/jquery-3.6.0.min.js51ms33ms6ms3rd
F
JS Bundles
Action
48 scripts, 575 KB unused
FIX
48 scripts, 575 KB unused
Warning::
https://www.belastingdienst.nl/bld-assets/bld/webc...: 108 KB unused (92%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://download.belastingdienst.nl/assets/bold/bl...: 91 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://download.belastingdienst.nl/assets/bold/bl...: unminified — 60 KB could be saved
Warning::
https://www.belastingdienst.nl/bld-assets/jquery/u...: 74 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.belastingdienst.nl/bld-assets/bld/bela...: 57 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://pwa001.belastingdienst.nl/adobe/db1f754ddf...: 54 KB unused (24%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 575 KB
575 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.belastingdienst.nl/bld-assets/bld/webcomponents/bld-webcomponents.js118 KB108 KB (92%)✓3rd
https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/bldc-validator.service-ebbc80ee.js125 KB91 KB (74%)✗3rd
https://www.belastingdienst.nl/bld-assets/jquery/ui/jquery-ui.1.13.2.custom.min.js91 KB74 KB (83%)✓3rd
https://www.belastingdienst.nl/bld-assets/bld/belastingdienst.js94 KB57 KB (62%)✓3rd
https://pwa001.belastingdienst.nl/adobe/db1f754ddf26/345c851e2a0e/launch-da94bc0c02f3.min.js227 KB54 KB (24%)✓3rd
https://www.belastingdienst.nl/bld-assets/bootstrap/bootstrap.min.js63 KB48 KB (79%)✓3rd
https://www.belastingdienst.nl/bld-assets/jquery/jquery-3.6.0.min.js89 KB41 KB (47%)✓3rd
https://www.belastingdienst.nl/bld-assets/bld/bld-metrix/bld-metrix.js45 KB33 KB (76%)✓3rd
https://www.belastingdienst.nl/bld-assets/packery/packery.pkgd.min.js38 KB24 KB (67%)✓3rd
https://try.abtasty.com/e7e9d856425677bf0f1ca47515bfcc27/main.dc98100278fab53404b3.js42 KB24 KB (58%)✓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
85 resources · 5.6 MB · 575 KB savings available
FIX
85 resources · 5.6 MB · 575 KB savings available
Warning::
Page weight 4.6 MB over 1MB target
Got: 5.6 MB Expected: ≤ 1 MB
Info::
~575 KB of savings available
Warning::
84 third-party resources (100% of weight)
Info::
5 resources over 200KB
85 resources · 5.6 MiB · 84 third-party 4.6 MiB over 1MB target
JavaScript 51% · 2.9 MiB
Image 39% · 2.2 MiB
CSS 6% · 364.3 KiB
Font 3% · 184.3 KiB
Other 1% · 36.0 KiB
Document 0% · 28.1 KiB

~575.0 KiB of savings available

Remove unused JavaScript: 575.0 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.

B
Image Optimization
7 images, 0 KB saveable
REVIEW
7 images, 0 KB saveable
Warning::
https://www.belastingdienst.nl/bld-assets/bld/rhsl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
7 images 2.2 MB
0 oversized -0 KB
5 legacy format
1 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

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
4 fonts (184 KB)
PASS
4 fonts (184 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

184 KB total

Render-blocking

0

of 4

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 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s FCP 12.9 s LCP 34.1 shttps://download.belastingdienst.nl/assets/bold/rofonts/1.0.2/fonts/ROsanswebtextbold.woffROsanswebtextbold.woff https://download.belastingdienst.nl/assets/bold/rofonts/1.0.2/fonts/ROsanswebtextbold.woff — 69.8 KiB — 110 ms — font-display: swaphttps://download.belastingdienst.nl/assets/bold/rofonts/1.0.2/fonts/ROsanswebtextregular.woffROsanswebtextregular.woff https://download.belastingdienst.nl/assets/bold/rofonts/1.0.2/fonts/ROsanswebtextregular.woff — 76.7 KiB — 76 ms — font-display: swapdata:application/x-font-ttf;charset=utf-8;base64,AAEAAAALAIAAAwAwT1MvMg8SDFEAAAC8AAAAYGNtYXDfzt66AA…x-font-ttf;charset=utf-... data:application/x-font-ttf;charset=utf-8;base64,AAEAAAALAIAAAwAwT1MvMg8SDFEAAAC8AAAAYGNtYXDfzt66AA… — 12.7 KiB — 34 ms — font-display: swapdata:application/font-woff;charset=utf-8;base64,d09GRgABAAAAAGR0ABMAAAAAtxAAAQAAAAAAAAAAAAAAAAAAAAA…font-woff;charset=utf-8... data:application/font-woff;charset=utf-8;base64,d09GRgABAAAAAGR0ABMAAAAAtxAAAQAAAAAAAAAAAAAAAAAAAAA… — 25.1 KiB — 35 ms — font-display: swap
ROsanswebtextbold.woff woff swap
Size 70 KB
Load time 110 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
ROsanswebtextregular.woff woff swap
Size 77 KB
Load time 76 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
x-font-ttf;charset=utf-... unknown swap
Size 13 KB
Load time 34 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
font-woff;charset=utf-8... woff swap
Size 25 KB
Load time 35 ms
Start 2.5 s
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 ~55 KB and ~110 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
Network Waterfall
85 requests over 3449ms
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 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s FCP 12.9 s LCP 34.1 shttps://belastingdienst.nl// https://belastingdienst.nl/ — 301 — 822 B — 119 ms — http/1.1https://www.belastingdienst.nl/www.belastingdienst.nl/ https://www.belastingdienst.nl/ — 302 — 838 B — 120 ms — http/1.1https://www.belastingdienst.nl/wps/wcm/connect/nl/home/homewww.belastingdienst.nl/wps/wcm/conn... https://www.belastingdienst.nl/wps/wcm/connect/nl/home/home — 200 — 26.4 KiB — 41 ms — http/1.1https://www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.csswww.belastingdienst.nl/bld-assets/s... https://www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.css — 200 — 4.2 KiB — 41 ms — http/1.1https://www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.jswww.belastingdienst.nl/bld-assets/s... https://www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.js — 200 — 11.1 KiB — 118 ms — http/1.1https://download.belastingdienst.nl/assets/bold/bldc-themes/2.0.0/dist/css/basecolors.cssdownload.belastingdienst.nl/assets/... https://download.belastingdienst.nl/assets/bold/bldc-themes/2.0.0/dist/css/basecolors.css — 200 — 8.3 KiB — 280 ms — http/1.1https://download.belastingdienst.nl/assets/bold/bldc-themes/2.0.0/dist/css/belastingdienst-light.cssdownload.belastingdienst.nl/assets/... https://download.belastingdienst.nl/assets/bold/bldc-themes/2.0.0/dist/css/belastingdienst-light.css — 200 — 8.1 KiB — 284 ms — http/1.1https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/bldc-components.jsdownload.belastingdienst.nl/assets/... https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/bldc-components.js — 200 — 41.1 KiB — 338 ms — http/1.1https://www.belastingdienst.nl/bld-assets/bold/bold-service-loader-4.12.2.jswww.belastingdienst.nl/bld-assets/b... https://www.belastingdienst.nl/bld-assets/bold/bold-service-loader-4.12.2.js — 200 — 6.4 KiB — 122 ms — http/1.1https://www.belastingdienst.nl/bld-assets/bld/bld-scripts-loader/bld-scripts-loader.jswww.belastingdienst.nl/bld-assets/b... https://www.belastingdienst.nl/bld-assets/bld/bld-scripts-loader/bld-scripts-loader.js — 200 — 8.1 KiB — 122 ms — http/1.1https://download.belastingdienst.nl/assets/bold/rofonts/1.0.2/css/rofonts.cssdownload.belastingdienst.nl/assets/... https://download.belastingdienst.nl/assets/bold/rofonts/1.0.2/css/rofonts.css — 200 — 2.6 KiB — 246 ms — http/1.1https://download.belastingdienst.nl/assets/css/fonts.cssdownload.belastingdienst.nl/assets/... https://download.belastingdienst.nl/assets/css/fonts.css — 200 — 3.6 KiB — 247 ms — http/1.1https://www.belastingdienst.nl/bld-assets/bld/belastingdienst.csswww.belastingdienst.nl/bld-assets/b... https://www.belastingdienst.nl/bld-assets/bld/belastingdienst.css — 200 — 297.7 KiB — 211 ms — http/1.1https://www.belastingdienst.nl/bld-assets/bld/rhslogos/bld_logo.svgwww.belastingdienst.nl/bld-assets/b... https://www.belastingdienst.nl/bld-assets/bld/rhslogos/bld_logo.svg — 200 — 19.2 KiB — 154 ms — http/1.1https://www.belastingdienst.nl/bld-assets/bld/webcomponents/bld-webcomponents.jswww.belastingdienst.nl/bld-assets/b... https://www.belastingdienst.nl/bld-assets/bld/webcomponents/bld-webcomponents.js — 200 — 118.2 KiB — 154 ms — http/1.1https://www.belastingdienst.nl/common_ext/js/surveys/bld_efm_default.jswww.belastingdienst.nl/common_ext/j... https://www.belastingdienst.nl/common_ext/js/surveys/bld_efm_default.js — 200 — 26.5 KiB — 126 ms — http/1.1https://www.belastingdienst.nl/bld-assets/jquery/jquery-3.6.0.min.jswww.belastingdienst.nl/bld-assets/j... https://www.belastingdienst.nl/bld-assets/jquery/jquery-3.6.0.min.js — 200 — 89.3 KiB — 75 ms — http/1.1https://www.belastingdienst.nl/bld-assets/jquery/ui/jquery-ui.1.13.2.custom.min.jswww.belastingdienst.nl/bld-assets/j... https://www.belastingdienst.nl/bld-assets/jquery/ui/jquery-ui.1.13.2.custom.min.js — 200 — 91.4 KiB — 76 ms — http/1.1https://www.belastingdienst.nl/bld-assets/bootstrap/popper.min.jswww.belastingdienst.nl/bld-assets/b... https://www.belastingdienst.nl/bld-assets/bootstrap/popper.min.js — 200 — 22.6 KiB — 40 ms — http/1.1https://www.belastingdienst.nl/bld-assets/bootstrap/bootstrap.min.jswww.belastingdienst.nl/bld-assets/b... https://www.belastingdienst.nl/bld-assets/bootstrap/bootstrap.min.js — 200 — 62.8 KiB — 42 ms — http/1.1https://www.belastingdienst.nl/bld-assets/bld/belastingdienst.jswww.belastingdienst.nl/bld-assets/b... https://www.belastingdienst.nl/bld-assets/bld/belastingdienst.js — 200 — 94.0 KiB — 73 ms — http/1.1https://www.belastingdienst.nl/common_ext/js/bld_next.jswww.belastingdienst.nl/common_ext/j... https://www.belastingdienst.nl/common_ext/js/bld_next.js — 200 — 3.4 KiB — 43 ms — http/1.1https://www.belastingdienst.nl/bld-assets/packery/packery.pkgd.min.jswww.belastingdienst.nl/bld-assets/p... https://www.belastingdienst.nl/bld-assets/packery/packery.pkgd.min.js — 200 — 38.1 KiB — 40 ms — http/1.1https://download.belastingdienst.nl/assets/bold/bldc-icons-belastingdienst/1.0.0/dist/js/icons.jsdownload.belastingdienst.nl/assets/... https://download.belastingdienst.nl/assets/bold/bldc-icons-belastingdienst/1.0.0/dist/js/icons.js — 200 — 102.6 KiB — 178 ms — http/1.1https://download.belastingdienst.nl/assets/bold/bldc-icons-rhs/1.0.0/dist/js/icons.jsdownload.belastingdienst.nl/assets/... https://download.belastingdienst.nl/assets/bold/bldc-icons-rhs/1.0.0/dist/js/icons.js — 200 — 1.3 MiB — 997 ms — http/1.1https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/index.jsdownload.belastingdienst.nl/assets/... https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/index.js — 200 — 3.8 KiB — 147 ms — http/1.1https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/index-36dcd2a1.jsdownload.belastingdienst.nl/assets/... https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/index-36dcd2a1.js — 200 — 88.3 KiB — 276 ms — http/1.1https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/app-globals-0f993ce5.jsdownload.belastingdienst.nl/assets/... https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/app-globals-0f993ce5.js — 200 — 2.1 KiB — 144 ms — http/1.1https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/bldc-translate-service-38a09ee1.jsdownload.belastingdienst.nl/assets/... https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/bldc-translate-service-38a09ee1.js — 200 — 63.1 KiB — 186 ms — 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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 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s FCP 12.9 s LCP 34.1 shttps://belastingdienst.nl// https://belastingdienst.nl/ — 301 — 822 B — 119 ms — http/1.1https://www.belastingdienst.nl/www.belastingdienst.nl/ https://www.belastingdienst.nl/ — 302 — 838 B — 120 ms — http/1.1https://www.belastingdienst.nl/wps/wcm/connect/nl/home/homewww.belastingdienst.nl/wps/wcm/conn... https://www.belastingdienst.nl/wps/wcm/connect/nl/home/home — 200 — 26.4 KiB — 41 ms — http/1.1https://www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.csswww.belastingdienst.nl/bld-assets/s... https://www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.css — 200 — 4.2 KiB — 41 ms — http/1.1https://www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.jswww.belastingdienst.nl/bld-assets/s... https://www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.js — 200 — 11.1 KiB — 118 ms — 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— 200 — 336 B — 27 ms — h2https://ariane.abtasty.com/ariane.abtasty.com/ https://ariane.abtasty.com/ — 200 — 235 B — 99 ms — h2
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 3904ms · 655KB · €42/mo
download.belastingdienst.nl
Other
Costly
Execution 1911ms
Transfer 66 KB
Monthly Cost €21/mo
www.belastingdienst.nl
Other
Costly
Execution 730ms
Transfer 0 KB
Monthly Cost €8/mo
Unattributable
Other
Costly
Execution 658ms
Transfer 0 KB
Monthly Cost €7/mo
pwa001.belastingdienst.nl
Other
Optional
Execution 136ms
Transfer 227 KB
Unused 24%
Monthly Cost €1/mo
try.abtasty.com
Other
Optional
Execution 99ms
Transfer 42 KB
Unused 58%
Monthly Cost €1/mo
www.belastingdienst.nl
Other
Optional
Execution 98ms
Transfer 94 KB
Unused 62%
Monthly Cost €1/mo
download.belastingdienst.nl
Other
Optional
Execution 85ms
Transfer 88 KB
Unused 24%
Monthly Cost €1/mo
download.belastingdienst.nl
Other
Optional
Execution 81ms
Transfer 10 KB
Monthly Cost €1/mo
www.belastingdienst.nl
Other
Optional
Execution 55ms
Transfer 38 KB
Unused 67%
Monthly Cost €1/mo
www.belastingdienst.nl
Other
Optional
Execution 51ms
Transfer 89 KB
Unused 47%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • download.belastingdienst.nl adds 1911ms and costs ~€21/month
  • www.belastingdienst.nl adds 730ms and costs ~€8/month
  • Unattributable adds 658ms and costs ~€7/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

download.belastingdienst.nl takes 1911ms 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.belastingdienst.nl takes 730ms 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

Unattributable takes 658ms 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 try.abtasty.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

62% of www.belastingdienst.nl'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

67% of www.belastingdienst.nl'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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