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Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

40

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
/wps/wcm/connect/nl/home/resources/2/5/2548bba2-44ba-4c33...0.0 ms1.9 MiB
download.belastingdienst.nl/assets/bold/bldc-icons-rhs/1.0.0/dist/js/icons.js0.0 ms1.3 MiB
www.belastingdienst.nl/bld-assets/bld/belastingdienst.css0.0 ms297.7 KiB
/wps/wcm/connect/nl/home/resources/b/a/ba507c06-467f-4421...0.0 ms209.0 KiB
/adobe/db1f754ddf26/345c851e2a0e/launch-da94bc0c02f3.min.js3600.0 s227.3 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-validat...0.0 ms124.6 KiB
www.belastingdienst.nl/bld-assets/bld/webcomponents/bld-webcomponents.js0.0 ms118.2 KiB
/assets/bold/bldc-icons-belastingdienst/1.0.0/dist/js/ico...0.0 ms102.6 KiB
www.belastingdienst.nl/bld-assets/bld/belastingdienst.js0.0 ms94.0 KiB
www.belastingdienst.nl/bld-assets/jquery/ui/jquery-ui.1.13.2.custom.min.js0.0 ms91.4 KiB
www.belastingdienst.nl/bld-assets/jquery/jquery-3.6.0.min.js0.0 ms89.3 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/index-36dcd2...0.0 ms88.3 KiB
/assets/bold/rofonts/1.0.2/fonts/ROsanswebtextregular.woff0.0 ms76.7 KiB
/assets/bold/rofonts/1.0.2/fonts/ROsanswebtextbold.woff0.0 ms69.8 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-sanitiz...0.0 ms65.7 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-transla...0.0 ms63.1 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-icon.se...0.0 ms63.0 KiB
www.belastingdienst.nl/bld-assets/bootstrap/bootstrap.min.js0.0 ms62.8 KiB
/wps/wcm/connect/nl/home/resources/6/2/628e188f-f565-4b91...0.0 ms59.7 KiB
www.belastingdienst.nl/bld-assets/bld/bld-metrix/bld-metrix.js0.0 ms45.4 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-compone...0.0 ms41.1 KiB
www.belastingdienst.nl/bld-assets/packery/packery.pkgd.min.js0.0 ms38.1 KiB
/adobe/db1f754ddf26/345c851e2a0e/0a4907de70b6/hostedLibFi...3600.0 s35.7 KiB
/script/4329/webReader/webReader.js?pids=wr&notools=1&ena...0.0 ms28.1 KiB
www.belastingdienst.nl/common_ext/js/surveys/bld_efm_default.js0.0 ms26.5 KiB
www.belastingdienst.nl/bld-assets/bootstrap/popper.min.js0.0 ms22.6 KiB
www.belastingdienst.nl/bld-assets/bld/rhslogos/bld_logo.svg0.0 ms19.2 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/Observable-e...0.0 ms16.1 KiB
/script/4329/webReader/r/r2889/ReadSpeaker.Styles-Button....86400.0 s39.9 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/nl-a1e9a3ae.js0.0 ms14.0 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-menu.se...0.0 ms11.7 KiB
www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.js0.0 ms11.1 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/css-theme-co...0.0 ms10.5 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-icon.en...0.0 ms9.8 KiB
/assets/bold/bldc-themes/2.0.0/dist/css/basecolors.css0.0 ms8.3 KiB
/assets/bold/bldc-themes/2.0.0/dist/css/belastingdienst-l...0.0 ms8.1 KiB
www.belastingdienst.nl/bld-assets/bld/bld-scripts-loader/bld-scripts-loader.js0.0 ms8.1 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/BehaviorSubj...0.0 ms7.1 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/package-70e5...0.0 ms6.9 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/date.const-3...0.0 ms6.7 KiB
www.belastingdienst.nl/bld-assets/bold/bold-service-loader-4.12.2.js0.0 ms6.4 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/style.helper...0.0 ms5.8 KiB
www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.css0.0 ms4.2 KiB
download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/index.js0.0 ms3.8 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-console...0.0 ms3.7 KiB
/adobe/db1f754ddf26/345c851e2a0e/0a4907de70b6/RC7164da07b...3600.0 s4.5 KiB
download.belastingdienst.nl/assets/css/fonts.css0.0 ms3.6 KiB
www.belastingdienst.nl/common_ext/js/bld_next.js0.0 ms3.4 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/keymap-42ed8...0.0 ms3.0 KiB
try.abtasty.com/e7e9d856425677bf0f1ca47515bfcc27.js30.0 s2.9 KiB
/adobe/db1f754ddf26/345c851e2a0e/0a4907de70b6/hostedLibFi...3600.0 s3.6 KiB
www.belastingdienst.nl/bld-assets/bld/bld-abtasty/bld-abtasty.js0.0 ms2.8 KiB
download.belastingdienst.nl/assets/bold/rofonts/1.0.2/css/rofonts.css0.0 ms2.6 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-user.se...0.0 ms2.5 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/_commonjsHel...0.0 ms2.5 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/unique-id-d2...0.0 ms2.4 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/app-globals-...0.0 ms2.1 KiB

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.2833419999999999] map[node:map[boundingRect:map[bottom:4938 height:4854 left:0 right:412 top:84 width:412] lhId:page-17-HTML nodeLabel:html.hydrated path:1,HTML selector:html.hydrated snippet:<html xml:lang="nl" lang="nl" class="hydrated" data-smartbanner-original-margin-top="0" style="margin-top: 84px;"> type:node] score:0.102066] map[node:map[boundingRect:map[bottom:2400 height:1237 left:0 right:412 top:1163 width:412] lhId:page-5-SECTION nodeLabel:Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … path:1,HTML,1,BODY,0,DIV,1,MAIN,2,SECTION selector:body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag snippet:<section data-type="important-themes" id="themalaag" aria-labelledby="important-themes-head" class="bld-layer-theme bld-section-arrow"> type:node] score:0.017152] map[node:map[boundingRect:map[bottom:1763 height:482 left:8 right:404 top:1281 width:396] lhId:page-3-DIV nodeLabel:Aangifte inkomstenbelasting Toeslagen Betalen en ontvangen Auto en woon-werk… path:1,HTML,1,BODY,0,DIV,1,MAIN,2,SECTION,0,DIV,1,DIV,0,DIV selector:section#themalaag > div#read-themalaag > div.row > div.col-12 snippet:<div class="col-12 col-md-6"> type:node] score:0.009673 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:179 height:95 left:186 right:395 top:84 width:209] lhId:page-23-IMG nodeLabel:Logo Belastingdienst | Ministerie van Financiën, link naar homepage van Belasti… path:1,HTML,1,BODY,0,DIV,0,HEADER,1,SECTION,0,DIV,0,DIV,0,DIV,0,A,0,IMG selector:div.row > div.col-12 > a > img#bld-img-logo snippet:<img id="bld-img-logo" src="https://www.belastingdienst.nl/bld-assets/bld/rhslogos/bld_logo.svg" alt="Logo Belastingdienst | Ministerie van Financiën, link naar homepage van Be…"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:2400 height:1237 left:0 right:412 top:1163 width:412] lhId:page-5-SECTION nodeLabel:Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … path:1,HTML,1,BODY,0,DIV,1,MAIN,2,SECTION selector:body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag snippet:<section data-type="important-themes" id="themalaag" aria-labelledby="important-themes-head" class="bld-layer-theme bld-section-arrow"> type:node] score:0.009178] map[node:map[boundingRect:map[bottom:2400 height:1237 left:0 right:412 top:1163 width:412] lhId:page-5-SECTION nodeLabel:Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … path:1,HTML,1,BODY,0,DIV,1,MAIN,2,SECTION selector:body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag snippet:<section data-type="important-themes" id="themalaag" aria-labelledby="important-themes-head" class="bld-layer-theme bld-section-arrow"> type:node] score:0.009158]]

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
/assets/bold/rofonts/1.0.2/fonts/ROsanswebtextbold.woff105 ms
/assets/bold/rofonts/1.0.2/fonts/ROsanswebtextregular.woff75 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:19.863 source:map[column:82 line:15 type:source-location url:https://download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/bldc-icon.entry.js urlProvider:network]] map[reflowTime:13.512 source:map[type:text value:[unattributed]]]]

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Belastingdienst Waarmee kunnen we u helpen? body.bld-dv > div#bld-wrapper > main#mainContentSkip > div#home
/wps/wcm/connect/nl/home/resources/2/5/2548bba2-44ba-4c33...1.9 MiB1.7 MiB
Lees voor Grote plannen? Of verandert er iets? Wij helpen u op weg met tips, h… body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#campagne-verandering
/wps/wcm/connect/nl/home/resources/b/a/ba507c06-467f-4421...207.2 KiB66.6 KiB
body.bld-dv > div.smartbanner > div.smartbanner__icon body.bld-dv > div.smartbanner > div.smartbanner__icon
/wps/wcm/connect/nl/home/resources/6/2/628e188f-f565-4b91...57.8 KiB15.2 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:281.7240009765625 label:Time to first byte subpart:timeToFirstByte] map[duration:1807.0869990234376 label:Resource load delay subpart:resourceLoadDelay] map[duration:1109.238 label:Resource load duration subpart:resourceLoadDuration] map[duration:32.344 label:Element render delay subpart:elementRenderDelay]]
lhId: page-0-DIV
nodeLabel: Belastingdienst Waarmee kunnen we u helpen?
path: 1,HTML,1,BODY,0,DIV,1,MAIN,0,DIV
selector: body.bld-dv > div#bld-wrapper > main#mainContentSkip > div#home
snippet: <div data-bld-bg-image="/wps/wcm/connect/nl/home/resources/2/5/2548bba2-44ba-4c33-86f1-55b1a298126…" id="home" class="bld-bg-image bld-bg-image-center" style="background-image: url(&quot;/wps/wcm/connect/nl/home/resources/2/5/2548bba2-44b…&quot;);">

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-DIV
nodeLabel: Belastingdienst Waarmee kunnen we u helpen?
path: 1,HTML,1,BODY,0,DIV,1,MAIN,0,DIV
selector: body.bld-dv > div#bld-wrapper > main#mainContentSkip > div#home
snippet: <div data-bld-bg-image="/wps/wcm/connect/nl/home/resources/2/5/2548bba2-44ba-4c33-86f1-55b1a298126…" id="home" class="bld-bg-image bld-bg-image-center" style="background-image: url(&quot;/wps/wcm/connect/nl/home/resources/2/5/2548bba2-44b…&quot;);">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
www.belastingdienst.nl/wps/wcm/connect/nl/home/homehttp/1.1
www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.csshttp/1.1
www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.jshttp/1.1
/assets/bold/bldc-themes/2.0.0/dist/css/basecolors.csshttp/1.1
/assets/bold/bldc-themes/2.0.0/dist/css/belastingdienst-l...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-compone...http/1.1
www.belastingdienst.nl/bld-assets/bold/bold-service-loader-4.12.2.jshttp/1.1
www.belastingdienst.nl/bld-assets/bld/bld-scripts-loader/bld-scripts-loader.jshttp/1.1
download.belastingdienst.nl/assets/bold/rofonts/1.0.2/css/rofonts.csshttp/1.1
download.belastingdienst.nl/assets/css/fonts.csshttp/1.1
www.belastingdienst.nl/bld-assets/bld/belastingdienst.csshttp/1.1
www.belastingdienst.nl/bld-assets/bld/rhslogos/bld_logo.svghttp/1.1
www.belastingdienst.nl/bld-assets/jquery/jquery-3.6.0.min.jshttp/1.1
www.belastingdienst.nl/bld-assets/jquery/ui/jquery-ui.1.13.2.custom.min.jshttp/1.1
www.belastingdienst.nl/bld-assets/bootstrap/popper.min.jshttp/1.1
www.belastingdienst.nl/bld-assets/bootstrap/bootstrap.min.jshttp/1.1
www.belastingdienst.nl/bld-assets/bld/webcomponents/bld-webcomponents.jshttp/1.1
www.belastingdienst.nl/bld-assets/bld/belastingdienst.jshttp/1.1
www.belastingdienst.nl/common_ext/js/bld_next.jshttp/1.1
www.belastingdienst.nl/common_ext/js/surveys/bld_efm_default.jshttp/1.1
www.belastingdienst.nl/bld-assets/packery/packery.pkgd.min.jshttp/1.1
/assets/bold/bldc-icons-belastingdienst/1.0.0/dist/js/ico...http/1.1
download.belastingdienst.nl/assets/bold/bldc-icons-rhs/1.0.0/dist/js/icons.jshttp/1.1
download.belastingdienst.nl/assets/bold/bldc-components/4.12.2/dist/esm/index.jshttp/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/index-36dcd2...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/app-globals-...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-transla...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-menu.se...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-user.se...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-validat...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-icon.se...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-console...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/package-70e5...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/nl-a1e9a3ae.jshttp/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/_commonjsHel...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/BehaviorSubj...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/Observable-e...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/keymap-42ed8...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/date.const-3...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-sanitiz...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-icon.en...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/css-theme-co...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/style.helper...http/1.1
/assets/bold/bldc-components/4.12.2/dist/esm/unique-id-d2...http/1.1
/assets/bold/rofonts/1.0.2/fonts/ROsanswebtextbold.woffhttp/1.1
/assets/bold/rofonts/1.0.2/fonts/ROsanswebtextregular.woffhttp/1.1
www.belastingdienst.nl/bld-assets/bld/bld-abtasty/bld-abtasty.jshttp/1.1
www.belastingdienst.nl/bld-assets/bld/bld-metrix/bld-metrix.jshttp/1.1
/wps/wcm/connect/bldcontentnl/berichten/berichten_uitgebr...http/1.1
www.belastingdienst.nl/wps/wcm/connect/nl/layouts/megamenu/megamenu_nl.jsonhttp/1.1
www.belastingdienst.nl/wps/wcm/connect/cci-content/zoeken/nl/zoeken.jsonhttp/1.1
/wps/wcm/connect/nl/home/resources/2/5/2548bba2-44ba-4c33...http/1.1
/wps/wcm/connect/nl/home/resources/b/a/ba507c06-467f-4421...http/1.1
www.belastingdienst.nl/mbd/splunkstatus.jsonhttp/1.1
/wps/wcm/connect/nl/home/resources/6/2/628e188f-f565-4b91...http/1.1
www.belastingdienst.nl/bld-assets/bld/images/favicon.icohttp/1.1

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
value: no origins were preconnected
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer SizeDuration
/assets/bold/bldc-themes/2.0.0/dist/css/belastingdienst-l...8.1 KiB1.2 s
/assets/bold/bldc-themes/2.0.0/dist/css/basecolors.css8.3 KiB1.2 s
download.belastingdienst.nl/assets/css/fonts.css3.6 KiB1.0 s
download.belastingdienst.nl/assets/bold/rofonts/1.0.2/css/rofonts.css2.6 KiB856 ms
www.belastingdienst.nl/bld-assets/bld/belastingdienst.css297.7 KiB5.3 s
www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.js11.1 KiB940 ms
www.belastingdienst.nl/bld-assets/smartbanner/smartbanner.css4.2 KiB338 ms

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.7 s
URLTime Spent
belastingdienst.nl/856 ms
www.belastingdienst.nl/852 ms
www.belastingdienst.nl/wps/wcm/connect/nl/home/home0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
html.hydrated html.hydrated
0.102
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.017
Aangifte inkomstenbelasting Toeslagen Betalen en ontvangen Auto en woon-werk… section#themalaag > div#read-themalaag > div.row > div.col-12
0.010
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.009
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.009
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.009
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.009
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.009
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.009
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.009
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.009
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.008
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.008
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.008
Lees voor Belangrijke thema's Aangifte inkomstenbelasting Toeslagen Betalen … body.bld-dv > div#bld-wrapper > main#mainContentSkip > section#themalaag
0.008

Diagnostics

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 910 ms 145.7 KiB
URLTransfer SizeEst Savings
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-validat...122.6 KiB60.4 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/index-36dcd2...86.3 KiB31.2 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-sanitiz...63.7 KiB29.0 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-transla...61.1 KiB15.9 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/Observable-e...14.1 KiB5.2 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-menu.se...9.7 KiB4.1 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.4 s 283.0 KiB
URLTransfer SizeEst Savings
www.belastingdienst.nl/bld-assets/bld/belastingdienst.css295.9 KiB246.5 KiB
/script/4329/webReader/r/r2889/ReadSpeaker.Styles-Button....39.4 KiB36.6 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 3.4 s 575.0 KiB
URLTransfer SizeEst Savings
www.belastingdienst.nl/bld-assets/bld/webcomponents/bld-webcomponents.js116.4 KiB107.6 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-validat...122.5 KiB90.7 KiB
www.belastingdienst.nl/bld-assets/jquery/ui/jquery-ui.1.13.2.custom.min.js89.5 KiB73.9 KiB
www.belastingdienst.nl/bld-assets/bld/belastingdienst.js92.1 KiB57.2 KiB
/adobe/db1f754ddf26/345c851e2a0e/launch-da94bc0c02f3.min.js226.5 KiB54.3 KiB
www.belastingdienst.nl/bld-assets/bootstrap/bootstrap.min.js60.9 KiB48.0 KiB
www.belastingdienst.nl/bld-assets/jquery/jquery-3.6.0.min.js87.4 KiB40.8 KiB
www.belastingdienst.nl/bld-assets/bld/bld-metrix/bld-metrix.js43.5 KiB33.1 KiB
www.belastingdienst.nl/bld-assets/packery/packery.pkgd.min.js36.3 KiB24.3 KiB
try.abtasty.com/e7e9d856425677bf0f1ca47515bfcc27/main.dc98100278fab53404b3.js41.9 KiB24.1 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/index-36dcd2...86.3 KiB21.0 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-sanitiz...1.9 s1.5 s0.3 ms
www.belastingdienst.nl/wps/wcm/connect/nl/home/home730 ms7.9 ms2.3 ms
Unattributable658 ms55 ms0.0 ms
/adobe/db1f754ddf26/345c851e2a0e/launch-da94bc0c02f3.min.js136 ms112 ms19 ms
try.abtasty.com/e7e9d856425677bf0f1ca47515bfcc27/main.dc98100278fab53404b3.js99 ms88 ms9.7 ms
www.belastingdienst.nl/bld-assets/bld/belastingdienst.js98 ms61 ms7.4 ms
/assets/bold/bldc-components/4.12.2/dist/esm/index-36dcd2...85 ms73 ms0.6 ms
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-icon.en...81 ms2.5 ms0.1 ms
www.belastingdienst.nl/bld-assets/packery/packery.pkgd.min.js55 ms46 ms2.7 ms
www.belastingdienst.nl/bld-assets/jquery/jquery-3.6.0.min.js51 ms33 ms6.5 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation2.1 s
Other849 ms
Parse HTML & CSS420 ms
Rendering325 ms
Style & Layout309 ms
Script Parsing & Compilation85 ms
Garbage Collection49 ms

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
/wps/wcm/connect/nl/home/resources/2/5/2548bba2-44ba-4c33...1.9 MiB
download.belastingdienst.nl/assets/bold/bldc-icons-rhs/1.0.0/dist/js/icons.js1.3 MiB
www.belastingdienst.nl/bld-assets/bld/belastingdienst.css297.7 KiB
/adobe/db1f754ddf26/345c851e2a0e/launch-da94bc0c02f3.min.js227.3 KiB
/wps/wcm/connect/nl/home/resources/b/a/ba507c06-467f-4421...209.0 KiB
/assets/bold/bldc-components/4.12.2/dist/esm/bldc-validat...124.6 KiB
www.belastingdienst.nl/bld-assets/bld/webcomponents/bld-webcomponents.js118.2 KiB
/assets/bold/bldc-icons-belastingdienst/1.0.0/dist/js/ico...102.6 KiB
www.belastingdienst.nl/bld-assets/bld/belastingdienst.js94.0 KiB
www.belastingdienst.nl/bld-assets/jquery/ui/jquery-ui.1.13.2.custom.min.js91.4 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
Logo Belastingdienst | Ministerie van Financiën, link naar homepage van Belasti… div.row > div.col-12 > a > img#bld-img-logo
www.belastingdienst.nl/bld-assets/bld/rhslogos/bld_logo.svg

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Max Potential First Input Delay 120 ms
●Optimize DOM size
●Optimize viewport for mobile
●Minify CSS
●Avoid long main-thread tasks 8 long tasks found
●Avoid non-composited animations 5 animated elements found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 30 ms
●Server Backend Latencies 30 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 40 ms
○INP breakdown
○User Timing marks and measures
96

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Navigation

A value greater than 0 implies an explicit navigation ordering. Although technically valid, this often creates frustrating experiences for users who rely on assistive technologies. Learn more about the `tabindex` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Ga naar hoofdinhoud div.container > ul > li > a#skiplink-mainContentSkip
Ga direct naar hoofdnavigatie div.container > ul > li > a#skiplink-navContentSkip
Ga direct naar footer div.container > ul > li > a#skiplink-footer
Logo Belastingdienst | Ministerie van Financiën, link naar homepage van Belasti… div.container > div.row > div.col-12 > a
Home div.container > ul#navContentSkip > li.nav-item > a.nav-link
Menu div.container > ul#navContentSkip > li.nav-item > a#bld-megamenu
Open zoeken div.container > ul#navContentSkip > li.nav-item > a#bld-zoeken
Inloggen div.container > ul#navContentSkip > li.nav-item > a#bld-loginmenu

These are opportunities to improve keyboard navigation in your application.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●Touch targets have sufficient size and spacing.
●`[lang]` attributes have a valid value
●Heading elements appear in a sequentially-descending order
●`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○Form elements have associated labels
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
100

Best Practices

General

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
download.belastingdienst.nl/assets/bold/bldc-icons-rhs/1.0.0/dist/js/icons.js
●Uses HTTPS
●Avoids deprecated APIs
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No browser errors logged to the console
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
100

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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