Tools & Wizards About Us
wiertsema.nl screenshot

Report Summary

  • 44

    Performance

    Renders faster than
    63% of other websites

  • 93

    Accessibility

    Visual factors better than
    that of 80% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 86

    SEO

    Google-friendlier than
    60% of websites

wiertsema.nl

Ingenieursbureau op het gebied van Geotechniek | Wiertsema & Partners

Page Load Speed

1.8 sec in total

First Response

320 ms

Resources Loaded

1.3 sec

Page Rendered

177 ms

wiertsema.nl screenshot

About Website

Click here to check amazing Wiertsema content. Otherwise, check out these important facts you probably never knew about wiertsema.nl

Wiertsema en Partners adres vraagstukken gebied geotechniek ruim 40 jaar ervaring behoren tot de top 3 ingenieursbureaus op het gebied Geotechniek Nederland

Visit wiertsema.nl

Key Findings

We analyzed Wiertsema.nl page load time and found that the first response time was 320 ms and then it took 1.4 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 30% of websites can load faster.

Performance Metrics

wiertsema.nl performance score

44

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.6 s

31/100

10%

LCP (Largest Contentful Paint)

Value10.4 s

0/100

25%

SI (Speed Index)

Value7.6 s

26/100

10%

TBT (Total Blocking Time)

Value390 ms

69/100

30%

CLS (Cumulative Layout Shift)

Value0.001

100/100

15%

TTI (Time to Interactive)

Value10.2 s

25/100

10%

Network Requests Diagram

wiertsema.nl

320 ms

webshop.css

96 ms

career.css

173 ms

portfoliomain.css

174 ms

portfoliolinks.css

174 ms

Our browser made a total of 45 requests to load all elements on the main page. We found that 89% of them (40 requests) were addressed to the original Wiertsema.nl, 4% (2 requests) were made to Platform.linkedin.com and 4% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (460 ms) belongs to the original domain Wiertsema.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 167.8 kB (30%)

Content Size

555.0 kB

After Optimization

387.2 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Wiertsema.nl main page is 555.0 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 25% of websites need less resources to load. Images take 366.2 kB which makes up the majority of the site volume.

HTML Optimization

-76%

Potential reduce by 13.5 kB

  • Original 17.7 kB
  • After minification 17.4 kB
  • After compression 4.3 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 13.5 kB or 76% of the original size.

Image Optimization

-12%

Potential reduce by 42.5 kB

  • Original 366.2 kB
  • After minification 323.7 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. Obviously, Wiertsema needs image optimization as it can save up to 42.5 kB or 12% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-65%

Potential reduce by 98.5 kB

  • Original 152.4 kB
  • After minification 142.1 kB
  • After compression 53.9 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 98.5 kB or 65% of the original size.

CSS Optimization

-72%

Potential reduce by 13.3 kB

  • Original 18.6 kB
  • After minification 15.6 kB
  • After compression 5.3 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. Wiertsema.nl needs all CSS files to be minified and compressed as it can save up to 13.3 kB or 72% of the original size.

Requests Breakdown

Number of requests can be reduced by 28 (64%)

Requests Now

44

After Optimization

16

  • Images
  • JavaScript
  • CSS

The browser has sent 44 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Wiertsema. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and from 13 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

wiertsema.nl

wiertsema.nl

320 ms

webshop.css

webshop.css

96 ms

career.css

career.css

173 ms

portfoliomain.css

portfoliomain.css

174 ms

portfoliolinks.css

portfoliolinks.css

174 ms

portfoliocontent.css

portfoliocontent.css

183 ms

downloads.css

downloads.css

189 ms

movies.css

movies.css

188 ms

pagescontent.css

pagescontent.css

257 ms

main.css

main.css

259 ms

content.css

content.css

260 ms

links.css

links.css

273 ms

materials.css

materials.css

282 ms

newscontent.css

newscontent.css

279 ms

swfobject_modified.js

swfobject_modified.js

344 ms

webshop.js

webshop.js

342 ms

projects.js

projects.js

343 ms

jwplayer.js

jwplayer.js

460 ms

swfobject.js

swfobject.js

372 ms

main.js

main.js

426 ms

linkbuilder.js

linkbuilder.js

427 ms

maps

maps

33 ms

in.js

in.js

7 ms

ga.js

ga.js

27 ms

bg_site.png

bg_site.png

97 ms

loep.png

loep.png

88 ms

headerBg.png

headerBg.png

433 ms

headerlogo.png

headerlogo.png

95 ms

mainmenu_bg.png

mainmenu_bg.png

96 ms

uk_flag.png

uk_flag.png

88 ms

fr_flag.png

fr_flag.png

175 ms

de_flag.png

de_flag.png

177 ms

wp.jpg

wp.jpg

185 ms

home_but_newsletter.png

home_but_newsletter.png

189 ms

home_but_cam.png

home_but_cam.png

191 ms

onderzoekbutton.png

onderzoekbutton.png

346 ms

advicebutton.png

advicebutton.png

433 ms

laboratoriumbutton.png

laboratoriumbutton.png

278 ms

duurzaambutton.png

duurzaambutton.png

375 ms

button.png

button.png

281 ms

footer.png

footer.png

370 ms

secureAnonymousFramework

secureAnonymousFramework

39 ms

newsSeperator.png

newsSeperator.png

362 ms

footer_bg.png

footer_bg.png

417 ms

__utm.gif

__utm.gif

28 ms

Accessibility Review

wiertsema.nl accessibility score

93

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

button, link, and menuitem elements do not have accessible names.

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

wiertsema.nl best practices score

75

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

Browser errors were logged to the console

SEO Factors

wiertsema.nl SEO score

86

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

High

robots.txt is not valid

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

Language and Encoding

  • Language Detected

    NL

  • Language Claimed

    N/A

  • Encoding

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Wiertsema.nl can be misinterpreted by Google and other search engines. Our service has detected that Dutch is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Wiertsema.nl main page’s claimed encoding is iso-8859-1. 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

wiertsema.nl

Open Graph description is not detected on the main page of Wiertsema. 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: