Report Summary

  • 72

    Performance

    Renders faster than
    82% of other websites

  • 100

    Accessibility

    Visual factors better than
    that of 98% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    86% of websites

  • 93

    SEO

    Google-friendlier than
    88% of websites

kb.nl

KB, nationale bibliotheek | KB, de nationale bibliotheek

Page Load Speed

2.7 sec in total

First Response

288 ms

Resources Loaded

2.1 sec

Page Rendered

324 ms

kb.nl screenshot

About Website

Click here to check amazing KB content for Netherlands. Otherwise, check out these important facts you probably never knew about kb.nl

KB, nationale bibliotheek

Visit kb.nl

Key Findings

We analyzed Kb.nl page load time and found that the first response time was 288 ms and then it took 2.4 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

kb.nl performance score

72

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.2 s

43/100

10%

LCP (Largest Contentful Paint)

Value3.6 s

62/100

25%

SI (Speed Index)

Value3.6 s

87/100

10%

TBT (Total Blocking Time)

Value260 ms

83/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value8.3 s

40/100

10%

Network Requests Diagram

kb.nl

288 ms

www.kb.nl

560 ms

css_gnCLsp8QhrIVqzyqHZlLU3pyVUnZ42noukGgOSczL8c.css

97 ms

css_u8qTZdKW7Rm0mvCuvsDYjRHboV5_2oZ6vHslJTGAAlU.css

192 ms

css_3hy9lJ7qf_LZ4nwnicG0TuVjZ9npW4RAylpVVVZ3QlI.css

364 ms

Our browser made a total of 46 requests to load all elements on the main page. We found that 87% of them (40 requests) were addressed to the original Kb.nl, 4% (2 requests) were made to Fonts.gstatic.com and 4% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (722 ms) belongs to the original domain Kb.nl.

Page Optimization Overview & Recommendations

Page size can be reduced by 422.3 kB (25%)

Content Size

1.7 MB

After Optimization

1.2 MB

In fact, the total size of Kb.nl main page is 1.7 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. 40% of websites need less resources to load. Images take 1.2 MB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 29.9 kB

  • Original 38.4 kB
  • After minification 36.6 kB
  • After compression 8.5 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 29.9 kB or 78% of the original size.

Image Optimization

-7%

Potential reduce by 81.3 kB

  • Original 1.2 MB
  • After minification 1.1 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. KB images are well optimized though.

JavaScript Optimization

-70%

Potential reduce by 215.1 kB

  • Original 305.8 kB
  • After minification 238.6 kB
  • After compression 90.7 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 215.1 kB or 70% of the original size.

CSS Optimization

-84%

Potential reduce by 95.9 kB

  • Original 114.6 kB
  • After minification 112.6 kB
  • After compression 18.6 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. Kb.nl needs all CSS files to be minified and compressed as it can save up to 95.9 kB or 84% of the original size.

Requests Breakdown

Number of requests can be reduced by 19 (48%)

Requests Now

40

After Optimization

21

The browser has sent 40 CSS, Javascripts, AJAX and image requests in order to completely render the main page of KB. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

kb.nl accessibility score

100

Accessibility Issues

Best Practices

kb.nl best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

kb.nl SEO score

93

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

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 Kb.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 Kb.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

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