Report Summary

  • 42

    Performance

    Renders faster than
    61% of other websites

  • 98

    Accessibility

    Visual factors better than
    that of 94% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 100

    SEO

    Google-friendlier than
    95% of websites

dbnl.org

DBNL - Digitale Bibliotheek voor de Nederlandse Letteren

Page Load Speed

3.3 sec in total

First Response

387 ms

Resources Loaded

2.8 sec

Page Rendered

154 ms

dbnl.org screenshot

About Website

Welcome to dbnl.org homepage info - get ready to check DBNL best content for Netherlands right away, or after learning these important things about dbnl.org

Digitale Bibliotheek voor de Nederlandse Letteren (The Digital Library of Dutch Literature is a collection of primary and secondary information on Dutch language and literature in its historical, soci...

Visit dbnl.org

Key Findings

We analyzed Dbnl.org page load time and found that the first response time was 387 ms and then it took 2.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 50% of websites can load faster.

Performance Metrics

dbnl.org performance score

42

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.1 s

1/100

10%

LCP (Largest Contentful Paint)

Value7.4 s

4/100

25%

SI (Speed Index)

Value8.0 s

21/100

10%

TBT (Total Blocking Time)

Value360 ms

72/100

30%

CLS (Cumulative Layout Shift)

Value0.013

100/100

15%

TTI (Time to Interactive)

Value10.4 s

24/100

10%

Network Requests Diagram

dbnl.org

387 ms

www.dbnl.org

487 ms

_settings.css

109 ms

dbnl.css

196 ms

header.css

259 ms

Our browser made a total of 61 requests to load all elements on the main page. We found that 95% of them (58 requests) were addressed to the original Dbnl.org, 5% (3 requests) were made to Webstatistieken.kb.nl. The less responsive or slowest element that took the longest time to load (898 ms) belongs to the original domain Dbnl.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 618.0 kB (69%)

Content Size

897.5 kB

After Optimization

279.4 kB

In fact, the total size of Dbnl.org main page is 897.5 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. 30% of websites need less resources to load. Javascripts take 761.5 kB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 15.8 kB

  • Original 20.4 kB
  • After minification 17.5 kB
  • After compression 4.6 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. This page needs HTML code to be minified as it can gain 2.9 kB, which is 14% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 15.8 kB or 77% of the original size.

JavaScript Optimization

-67%

Potential reduce by 513.1 kB

  • Original 761.5 kB
  • After minification 718.9 kB
  • After compression 248.4 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 513.1 kB or 67% of the original size.

CSS Optimization

-77%

Potential reduce by 89.1 kB

  • Original 115.5 kB
  • After minification 88.2 kB
  • After compression 26.4 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. Dbnl.org needs all CSS files to be minified and compressed as it can save up to 89.1 kB or 77% of the original size.

Requests Breakdown

Number of requests can be reduced by 38 (67%)

Requests Now

57

After Optimization

19

The browser has sent 57 CSS, Javascripts, AJAX and image requests in order to completely render the main page of DBNL. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 14 to 1 for JavaScripts and from 21 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

dbnl.org accessibility score

98

Accessibility Issues

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Some elements have a [tabindex] value greater than 0

Best Practices

dbnl.org best practices score

83

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

SEO Factors

dbnl.org SEO score

100

Search Engine Optimization Advices

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

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Dbnl.org 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 Dbnl.org 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

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