Tools & Wizards About Us
duurzaamgebouwd.nl screenshot

Report Summary

  • 23

    Performance

    Renders faster than
    41% of other websites

  • 96

    Accessibility

    Visual factors better than
    that of 88% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 91

    SEO

    Google-friendlier than
    70% of websites

duurzaamgebouwd.nl

Het laatste nieuws over duurzaam bouwen | Duurzaam Gebouwd

Page Load Speed

3.5 sec in total

First Response

198 ms

Resources Loaded

3 sec

Page Rendered

298 ms

duurzaamgebouwd.nl screenshot

About Website

Welcome to duurzaamgebouwd.nl homepage info - get ready to check Duurzaam Gebouwd best content for Netherlands right away, or after learning these important things about duurzaamgebouwd.nl

Iedereen in Nederland wil duurzaam bouwen, maar wat is de zin en de onzin hiervan? Duurzaam Gebouwd is de leidende expertblog voor en door experts op het gebied van duurzaam bouwen. De weblogs worden ...

Visit duurzaamgebouwd.nl

Key Findings

We analyzed Duurzaamgebouwd.nl page load time and found that the first response time was 198 ms and then it took 3.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.

Performance Metrics

duurzaamgebouwd.nl performance score

23

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.4 s

17/100

10%

LCP (Largest Contentful Paint)

Value12.9 s

0/100

25%

SI (Speed Index)

Value9.1 s

14/100

10%

TBT (Total Blocking Time)

Value760 ms

39/100

30%

CLS (Cumulative Layout Shift)

Value0.278

44/100

15%

TTI (Time to Interactive)

Value11.1 s

20/100

10%

Network Requests Diagram

duurzaamgebouwd.nl

198 ms

www.duurzaamgebouwd.nl

862 ms

css

30 ms

bootstrap.css

99 ms

swiper.css

192 ms

Our browser made a total of 60 requests to load all elements on the main page. We found that 42% of them (25 requests) were addressed to the original Duurzaamgebouwd.nl, 33% (20 requests) were made to Duurzaamgebouwd.lingacms.nl and 7% (4 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (1.4 sec) relates to the external source Duurzaamgebouwd.lingacms.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 169.4 kB (8%)

Content Size

2.0 MB

After Optimization

1.8 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Duurzaamgebouwd.nl main page is 2.0 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 70% of websites need less resources to load. Images take 1.8 MB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 54.6 kB

  • Original 65.2 kB
  • After minification 61.6 kB
  • After compression 10.6 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 54.6 kB or 84% of the original size.

Image Optimization

-6%

Potential reduce by 103.3 kB

  • Original 1.8 MB
  • After minification 1.7 MB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Duurzaam Gebouwd images are well optimized though.

JavaScript Optimization

-3%

Potential reduce by 3.3 kB

  • Original 108.1 kB
  • After minification 107.0 kB
  • After compression 104.8 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. This website has mostly compressed JavaScripts.

CSS Optimization

-13%

Potential reduce by 8.2 kB

  • Original 63.4 kB
  • After minification 63.4 kB
  • After compression 55.3 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Duurzaamgebouwd.nl needs all CSS files to be minified and compressed as it can save up to 8.2 kB or 13% of the original size.

Requests Breakdown

Number of requests can be reduced by 21 (40%)

Requests Now

53

After Optimization

32

  • Images
  • JavaScript
  • CSS

The browser has sent 53 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Duurzaam Gebouwd. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

duurzaamgebouwd.nl

duurzaamgebouwd.nl

198 ms

www.duurzaamgebouwd.nl

www.duurzaamgebouwd.nl

862 ms

css

css

30 ms

bootstrap.css

bootstrap.css

99 ms

swiper.css

swiper.css

192 ms

default.css

default.css

380 ms

jquery.js

jquery.js

380 ms

bootstrap.js

bootstrap.js

290 ms

default.js

default.js

287 ms

swiper.js

swiper.js

391 ms

track.js

track.js

291 ms

jqueryui.js

jqueryui.js

387 ms

font-awesome.min.css

font-awesome.min.css

97 ms

gtm.js

gtm.js

130 ms

circulair-renoveren-en-co2-reduceren-in-e-zine_1_HZSKnA.jpg

circulair-renoveren-en-co2-reduceren-in-e-zine_1_HZSKnA.jpg

153 ms

0.jpg

0.jpg

151 ms

onderzoek-en-onderwijs-broodnodig-voor-veilige-bouwmethodetransitie_1_jAApnr.jpg

onderzoek-en-onderwijs-broodnodig-voor-veilige-bouwmethodetransitie_1_jAApnr.jpg

201 ms

hoger-rendement-en-minder-milieu-impact-voor-warmtepompen_1_5KcMVr.jpg

hoger-rendement-en-minder-milieu-impact-voor-warmtepompen_1_5KcMVr.jpg

969 ms

kans-voor-bouwbedrijven-in-analyseren-projectinformatie-data_1_6d4j8Q.jpg

kans-voor-bouwbedrijven-in-analyseren-projectinformatie-data_1_6d4j8Q.jpg

256 ms

20240516-duurzaam-gebouwd-op-locatie-circulair-renoveren_1_tr3Pbv_small.jpg

20240516-duurzaam-gebouwd-op-locatie-circulair-renoveren_1_tr3Pbv_small.jpg

265 ms

circulaire-transitie-heeft-nu-meer-stimulansen-nodig_1_wS2PFz.jpg

circulaire-transitie-heeft-nu-meer-stimulansen-nodig_1_wS2PFz.jpg

1408 ms

smart-home-oplossingen-in-toekomstbestendig-houten-appartementencomplex_1_429SXf.jpg

smart-home-oplossingen-in-toekomstbestendig-houten-appartementencomplex_1_429SXf.jpg

266 ms

whitepaper-circulair-bouwen-met-maximale-co2-impact_1_y2mx8X.jpg

whitepaper-circulair-bouwen-met-maximale-co2-impact_1_y2mx8X.jpg

219 ms

klimaatgroep_holland_bv_1_fcs8y3.jpg

klimaatgroep_holland_bv_1_fcs8y3.jpg

263 ms

van-der-heijden-bouw-en-ontwikkeling_1_sJGkDj.png

van-der-heijden-bouw-en-ontwikkeling_1_sJGkDj.png

449 ms

vaillant-group-netherlands_1_Fk36RM.png

vaillant-group-netherlands_1_Fk36RM.png

451 ms

atag-verwarming-nederland_1_zz9WD9.png

atag-verwarming-nederland_1_zz9WD9.png

450 ms

ballast_nedam_bouw_ontwikkeling_bv_1_sfZfkx.jpg

ballast_nedam_bouw_ontwikkeling_bv_1_sfZfkx.jpg

621 ms

planon-building-management_1_PLsDkF.png

planon-building-management_1_PLsDkF.png

451 ms

nl-greenlabel_1_7Pjx73.png

nl-greenlabel_1_7Pjx73.png

452 ms

rebrick_1_vmy8FL.png

rebrick_1_vmy8FL.png

454 ms

autodesk-bv_1_M9FsvX.png

autodesk-bv_1_M9FsvX.png

455 ms

stiebel-eltron_1_cLXr8T.png

stiebel-eltron_1_cLXr8T.png

455 ms

madaster_1_6VWjm8.png

madaster_1_6VWjm8.png

731 ms

alba-concepts_1_J4b7Fm_fwGD.png

alba-concepts_1_J4b7Fm_fwGD.png

456 ms

logo-292x80.png

logo-292x80.png

198 ms

logo.png

logo.png

198 ms

logo-182x50.png

logo-182x50.png

196 ms

web_bckg_fade_bottom.png

web_bckg_fade_bottom.png

197 ms

icon-kalender.png

icon-kalender.png

210 ms

twitter-2.png

twitter-2.png

196 ms

linkedin-2.png

linkedin-2.png

451 ms

facebook-2.png

facebook-2.png

452 ms

youtube-2.png

youtube-2.png

450 ms

flickr.png

flickr.png

452 ms

logo.png

logo.png

455 ms

maxresdefault.jpg

maxresdefault.jpg

450 ms

KFOmCnqEu92Fr1Me5Q.ttf

KFOmCnqEu92Fr1Me5Q.ttf

26 ms

KFOlCnqEu92Fr1MmWUlvAw.ttf

KFOlCnqEu92Fr1MmWUlvAw.ttf

41 ms

pxiByp8kv8JHgFVrLCz7V1s.ttf

pxiByp8kv8JHgFVrLCz7V1s.ttf

48 ms

flUhRq6tzZclQEJ-Vdg-IuiaDsNZ.ttf

flUhRq6tzZclQEJ-Vdg-IuiaDsNZ.ttf

60 ms

glyphicons-halflings-regular.woff

glyphicons-halflings-regular.woff

408 ms

overlay.png

overlay.png

396 ms

js

js

85 ms

destination

destination

84 ms

insight.min.js

insight.min.js

84 ms

fbevents.js

fbevents.js

35 ms

cookieconsent.min.css

cookieconsent.min.css

69 ms

cookieconsent.min.js

cookieconsent.min.js

262 ms

insight_tag_errors.gif

insight_tag_errors.gif

167 ms

Accessibility Review

duurzaamgebouwd.nl accessibility score

96

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Links do not have a discernible name

Best Practices

duurzaamgebouwd.nl best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

duurzaamgebouwd.nl SEO score

91

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    NL

  • Language Claimed

    NL

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Duurzaamgebouwd.nl can be misinterpreted by Google and other search engines. Our service has detected that Dutch is used on the page, and it matches the claimed language. Our system also found out that Duurzaamgebouwd.nl main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

duurzaamgebouwd.nl

Open Graph description is not detected on the main page of Duurzaam Gebouwd. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: