Tools & Wizards About Us
blowerdoor.nu screenshot

Report Summary

  • 9

    Performance

    Renders faster than
    23% of other websites

  • 58

    Accessibility

    Visual factors better than
    that of 25% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 84

    SEO

    Google-friendlier than
    53% of websites

blowerdoor.nu

Last van tocht? Professionele BlowerDoor luchtdichtheidstest

Page Load Speed

9.6 sec in total

First Response

2.1 sec

Resources Loaded

7.2 sec

Page Rendered

263 ms

blowerdoor.nu screenshot

About Website

Welcome to blowerdoor.nu homepage info - get ready to check Blower Door best content right away, or after learning these important things about blowerdoor.nu

Graag een BlowerDoor meting laten uitvoeren door onze BlowerDoor experts? Specialist in het opsporen van luchtlekken! Uitgebreide rapportage van bevindingen

Visit blowerdoor.nu

Key Findings

We analyzed Blowerdoor.nu page load time and found that the first response time was 2.1 sec and then it took 7.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 85% of websites can load faster.

Performance Metrics

blowerdoor.nu performance score

9

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value9.5 s

0/100

10%

LCP (Largest Contentful Paint)

Value13.6 s

0/100

25%

SI (Speed Index)

Value19.5 s

0/100

10%

TBT (Total Blocking Time)

Value1,590 ms

12/100

30%

CLS (Cumulative Layout Shift)

Value0.337

33/100

15%

TTI (Time to Interactive)

Value20.1 s

2/100

10%

Network Requests Diagram

www.blowerdoor.nu

2144 ms

language-selector.css

191 ms

portfolio-slideshow.min.css

173 ms

styles.css

181 ms

font-awesome.min.css

287 ms

Our browser made a total of 103 requests to load all elements on the main page. We found that 78% of them (80 requests) were addressed to the original Blowerdoor.nu, 4% (4 requests) were made to Maps.google.com and 4% (4 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (2.1 sec) belongs to the original domain Blowerdoor.nu.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.3 MB (60%)

Content Size

2.1 MB

After Optimization

848.8 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Blowerdoor.nu main page is 2.1 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. 60% of websites need less resources to load. Javascripts take 1.2 MB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 47.4 kB

  • Original 56.8 kB
  • After minification 52.8 kB
  • After compression 9.3 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 47.4 kB or 84% of the original size.

Image Optimization

-8%

Potential reduce by 36.6 kB

  • Original 431.9 kB
  • After minification 395.3 kB

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. Blower Door images are well optimized though.

JavaScript Optimization

-68%

Potential reduce by 783.4 kB

  • Original 1.2 MB
  • After minification 1.1 MB
  • After compression 374.1 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 783.4 kB or 68% of the original size.

CSS Optimization

-86%

Potential reduce by 426.5 kB

  • Original 496.6 kB
  • After minification 428.0 kB
  • After compression 70.1 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. Blowerdoor.nu needs all CSS files to be minified and compressed as it can save up to 426.5 kB or 86% of the original size.

Requests Breakdown

Number of requests can be reduced by 66 (68%)

Requests Now

97

After Optimization

31

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 97 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Blower Door. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 47 to 1 for JavaScripts and from 21 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

www.blowerdoor.nu

www.blowerdoor.nu

2144 ms

language-selector.css

language-selector.css

191 ms

portfolio-slideshow.min.css

portfolio-slideshow.min.css

173 ms

styles.css

styles.css

181 ms

font-awesome.min.css

font-awesome.min.css

287 ms

bootstrap.css

bootstrap.css

389 ms

front.css

front.css

295 ms

layerslider.css

layerslider.css

265 ms

refresh.css

refresh.css

268 ms

style.css

style.css

301 ms

style.css

style.css

445 ms

red-color.css

red-color.css

375 ms

css

css

74 ms

fontello.css

fontello.css

382 ms

prettyPhoto.css

prettyPhoto.css

384 ms

nivo-slider.css

nivo-slider.css

383 ms

flexslider.css

flexslider.css

474 ms

layer-slider.css

layer-slider.css

466 ms

settings.css

settings.css

1385 ms

advanced-recent-posts-widget.css

advanced-recent-posts-widget.css

493 ms

jquery.js

jquery.js

586 ms

jquery-migrate.min.js

jquery-migrate.min.js

523 ms

prototype.js

prototype.js

77 ms

bootstrap.min.js

bootstrap.min.js

643 ms

jquery.cookie.js

jquery.cookie.js

558 ms

front.js

front.js

589 ms

chosen.jquery.min.js

chosen.jquery.min.js

605 ms

layerslider.kreaturamedia.jquery.js

layerslider.kreaturamedia.jquery.js

855 ms

jquery-easing-1.3.js

jquery-easing-1.3.js

673 ms

jquerytransit.js

jquerytransit.js

679 ms

layerslider.transitions.js

layerslider.transitions.js

688 ms

js

js

48 ms

flex-slider.min.js

flex-slider.min.js

736 ms

navigation.min.js

navigation.min.js

761 ms

jquery.theme.plugins.min.js

jquery.theme.plugins.min.js

770 ms

jquery.jcarousel.min.js

jquery.jcarousel.min.js

770 ms

jquery-transit.js

jquery-transit.js

815 ms

flickr.js

flickr.js

846 ms

instagram.js

instagram.js

856 ms

wp-slimstat.min.js

wp-slimstat.min.js

7 ms

oauth_twitter_widget.css

oauth_twitter_widget.css

794 ms

dribbble.js

dribbble.js

745 ms

jquery.twitter.js

jquery.twitter.js

775 ms

prettyPhoto.min.js

prettyPhoto.min.js

749 ms

fitVids.js

fitVids.js

688 ms

jquery.cookie.js

jquery.cookie.js

696 ms

colorpicker.min.js

colorpicker.min.js

724 ms

css

css

22 ms

map.min.js

map.min.js

736 ms

jquery.validate.min.js

jquery.validate.min.js

744 ms

custom.js

custom.js

662 ms

jquery.cycle.all.min.js

jquery.cycle.all.min.js

685 ms

portfolio-slideshow.min.js

portfolio-slideshow.min.js

713 ms

jquery.form.min.js

jquery.form.min.js

730 ms

scripts.js

scripts.js

723 ms

jquery.nivo.slider.pack.js

jquery.nivo.slider.pack.js

689 ms

jquery.isotope.min.js

jquery.isotope.min.js

699 ms

sitepress.js

sitepress.js

721 ms

mc-grid.js

mc-grid.js

702 ms

mc-list.js

mc-list.js

681 ms

mc-mini.js

mc-mini.js

662 ms

wp-emoji-release.min.js

wp-emoji-release.min.js

871 ms

ga.js

ga.js

207 ms

common.js

common.js

246 ms

util.js

util.js

246 ms

geocoder.js

geocoder.js

246 ms

body-bg-1.jpg

body-bg-1.jpg

363 ms

Thermodicht-blowerdoor-logo-1.png

Thermodicht-blowerdoor-logo-1.png

362 ms

search-bg.png

search-bg.png

227 ms

11.jpg

11.jpg

498 ms

21.jpg

21.jpg

377 ms

31.jpg

31.jpg

472 ms

41.jpg

41.jpg

678 ms

portfolio-hover.png

portfolio-hover.png

473 ms

De-Klipper-IJmuiden-215x161.jpg

De-Klipper-IJmuiden-215x161.jpg

538 ms

DSC07759-215x161.jpg

DSC07759-215x161.jpg

472 ms

HoofdingangAZU-215x161.jpg

HoofdingangAZU-215x161.jpg

629 ms

nieuwAmsterdamgebouw-215x161.jpg

nieuwAmsterdamgebouw-215x161.jpg

638 ms

erasmus-mc-rotterdam-215x161.jpg

erasmus-mc-rotterdam-215x161.jpg

636 ms

Distributiecentrum-Tilburg-215x161.jpg

Distributiecentrum-Tilburg-215x161.jpg

642 ms

carousel-prev-next.png

carousel-prev-next.png

628 ms

blowerdoor.png

blowerdoor.png

713 ms

thermodicht.png

thermodicht.png

715 ms

luchtdichtrenoveren.png

luchtdichtrenoveren.png

722 ms

flir.png

flir.png

736 ms

airinstruments.png

airinstruments.png

742 ms

thumb.php

thumb.php

832 ms

BlowerDoor_NL.png

BlowerDoor_NL.png

795 ms

__utm.gif

__utm.gif

70 ms

75872285

75872285

102 ms

cJZKeOuBrn4kERxqtaUH3T8E0i7KZn-EPnyo3HZu7kw.woff

cJZKeOuBrn4kERxqtaUH3T8E0i7KZn-EPnyo3HZu7kw.woff

39 ms

DXI1ORHCpsQm3Vp6mXoaTXhCUOGz7vYGh680lGh-uXM.woff

DXI1ORHCpsQm3Vp6mXoaTXhCUOGz7vYGh680lGh-uXM.woff

48 ms

MTP_ySUJH_bn48VBG8sNSnhCUOGz7vYGh680lGh-uXM.woff

MTP_ySUJH_bn48VBG8sNSnhCUOGz7vYGh680lGh-uXM.woff

66 ms

k3k702ZOKiLJc3WVjuplzHhCUOGz7vYGh680lGh-uXM.woff

k3k702ZOKiLJc3WVjuplzHhCUOGz7vYGh680lGh-uXM.woff

76 ms

fontello.woff

fontello.woff

591 ms

player.js

player.js

77 ms

player.css

player.css

63 ms

ga.js

ga.js

4 ms

vuid.min.js

vuid.min.js

75 ms

__utm.gif

__utm.gif

21 ms

proxy.html

proxy.html

55 ms

450621789.webp

450621789.webp

114 ms

4000976_60x60.jpg

4000976_60x60.jpg

92 ms

Accessibility Review

blowerdoor.nu accessibility score

58

Accessibility Issues

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

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

blowerdoor.nu best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

blowerdoor.nu SEO score

84

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

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

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

    ANSI

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Blowerdoor.nu 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 Blowerdoor.nu main page’s claimed encoding is ansi. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

blowerdoor.nu

Open Graph data is detected on the main page of Blower Door. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: