Tools & Wizards About Us
ddl.nl screenshot

Report Summary

  • 29

    Performance

    Renders faster than
    49% of other websites

  • 87

    Accessibility

    Visual factors better than
    that of 66% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 90

    SEO

    Google-friendlier than
    68% of websites

ddl.nl

Partner in advanced diagnostic solutions - DDL Diagnostic Laboratory

Page Load Speed

3.1 sec in total

First Response

373 ms

Resources Loaded

2.2 sec

Page Rendered

527 ms

ddl.nl screenshot

About Website

Visit ddl.nl now to see the best up-to-date DDL content and also check out these interesting facts you probably never knew about ddl.nl

DDL Diagnostic Laboratory (DDL) is a testing and contract research laboratory specialized in molecular diagnostics.

Visit ddl.nl

Key Findings

We analyzed Ddl.nl page load time and found that the first response time was 373 ms and then it took 2.7 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

ddl.nl performance score

29

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.2 s

19/100

10%

LCP (Largest Contentful Paint)

Value9.4 s

0/100

25%

SI (Speed Index)

Value6.1 s

45/100

10%

TBT (Total Blocking Time)

Value1,220 ms

20/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value11.7 s

17/100

10%

Network Requests Diagram

ddl.nl

373 ms

cerbaresearch.com

173 ms

uc.js

35 ms

style.min.css

23 ms

main.css

44 ms

Our browser made a total of 65 requests to load all elements on the main page. We found that 2% of them (1 request) were addressed to the original Ddl.nl, 60% (39 requests) were made to Cerbaresearch.com and 12% (8 requests) were made to Youtube.com. The less responsive or slowest element that took the longest time to load (730 ms) relates to the external source Webeo-web-content.s3-eu-west-1.amazonaws.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 218.8 kB (5%)

Content Size

4.7 MB

After Optimization

4.5 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Ddl.nl main page is 4.7 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. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 4.3 MB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 99.1 kB

  • Original 120.9 kB
  • After minification 120.7 kB
  • After compression 21.8 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 99.1 kB or 82% of the original size.

Image Optimization

-1%

Potential reduce by 28.1 kB

  • Original 4.3 MB
  • After minification 4.2 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. DDL images are well optimized though.

JavaScript Optimization

-30%

Potential reduce by 91.6 kB

  • Original 309.3 kB
  • After minification 309.3 kB
  • After compression 217.7 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 91.6 kB or 30% of the original size.

CSS Optimization

-0%

Potential reduce by 0 B

  • Original 59.2 kB
  • After minification 59.2 kB
  • After compression 59.2 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. Ddl.nl has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 18 (32%)

Requests Now

57

After Optimization

39

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 57 CSS, Javascripts, AJAX and image requests in order to completely render the main page of DDL. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 16 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

ddl.nl

ddl.nl

373 ms

cerbaresearch.com

cerbaresearch.com

173 ms

uc.js

uc.js

35 ms

style.min.css

style.min.css

23 ms

main.css

main.css

44 ms

js

js

66 ms

jquery.min.js

jquery.min.js

29 ms

jquery-migrate.min.js

jquery-migrate.min.js

29 ms

201109.js

201109.js

91 ms

main.js

main.js

42 ms

asyncdc.min.js

asyncdc.min.js

43 ms

vcd15cbe7772f49c399c6a5babf22c1241717689176015

vcd15cbe7772f49c399c6a5babf22c1241717689176015

57 ms

css2

css2

39 ms

rollbar.min.js

rollbar.min.js

132 ms

gtm.js

gtm.js

67 ms

core.webeo.js

core.webeo.js

730 ms

cerba-logo--text-header-size.png

cerba-logo--text-header-size.png

139 ms

cxjNGR21CpE

cxjNGR21CpE

179 ms

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4TIN3dZpLZ0

551 ms

llzczJra6Jg

llzczJra6Jg

612 ms

QXexG_BH2-w

QXexG_BH2-w

699 ms

cerba-logo--header-size.png

cerba-logo--header-size.png

123 ms

Cerba-Research_Website-Image_Home-Mobile_750x1164px.png

Cerba-Research_Website-Image_Home-Mobile_750x1164px.png

122 ms

J001940_Cerba_CollectiveFocus_WebBanners_Notext-1-1.png

J001940_Cerba_CollectiveFocus_WebBanners_Notext-1-1.png

44 ms

Website-Banner-Final-1-scaled.jpg

Website-Banner-Final-1-scaled.jpg

158 ms

Cerba%E2%80%93Research_Viroclinics_Header%E2%80%93banner_Mobile.jpg

Cerba%E2%80%93Research_Viroclinics_Header%E2%80%93banner_Mobile.jpg

120 ms

Cerba%E2%80%93Research_Viroclinics_Header%E2%80%93banner_Desktop-scaled.jpg

Cerba%E2%80%93Research_Viroclinics_Header%E2%80%93banner_Desktop-scaled.jpg

157 ms

hero-mobile.png

hero-mobile.png

534 ms

hero-desktop.png

hero-desktop.png

123 ms

DSC_0050-scaled.jpg

DSC_0050-scaled.jpg

471 ms

353A9727-scaled.jpg

353A9727-scaled.jpg

535 ms

DSC09926-scaled.jpg

DSC09926-scaled.jpg

687 ms

Our-expertise-in-infectious-diseases.jpg

Our-expertise-in-infectious-diseases.jpg

213 ms

play-white.svg

play-white.svg

213 ms

Thumbnail-CG.jpg

Thumbnail-CG.jpg

223 ms

Our-expertise-in-oncology.jpg

Our-expertise-in-oncology.jpg

219 ms

Image-video-brand.png

Image-video-brand.png

533 ms

people-white.svg

people-white.svg

530 ms

pin-white.svg

pin-white.svg

528 ms

globe-white.svg

globe-white.svg

590 ms

shutterstock_536140861.png

shutterstock_536140861.png

592 ms

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593 ms

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678 ms

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esteban-benites-_bZzytRTSvo-unsplash.png

592 ms

shutterstock_1673662414.png

shutterstock_1673662414.png

677 ms

shutterstock_146119724.png

shutterstock_146119724.png

677 ms

cerba-logo--fullsize.png

cerba-logo--fullsize.png

679 ms

Cerba-US-Expansion-Tour-VF.00_04_27_19.Still010.jpg

Cerba-US-Expansion-Tour-VF.00_04_27_19.Still010.jpg

678 ms

linked-in-white.svg

linked-in-white.svg

680 ms

twitter-white.svg

twitter-white.svg

686 ms

facebook-white.svg

facebook-white.svg

682 ms

youtube-white.svg

youtube-white.svg

683 ms

KFOlCnqEu92Fr1MmSU5vAw.ttf

KFOlCnqEu92Fr1MmSU5vAw.ttf

42 ms

KFOmCnqEu92Fr1Me5Q.ttf

KFOmCnqEu92Fr1Me5Q.ttf

51 ms

KFOjCnqEu92Fr1Mu51TjARc9.ttf

KFOjCnqEu92Fr1Mu51TjARc9.ttf

5 ms

KFOkCnqEu92Fr1Mu52xP.ttf

KFOkCnqEu92Fr1Mu52xP.ttf

12 ms

www-player.css

www-player.css

18 ms

www-embed-player.js

www-embed-player.js

35 ms

base.js

base.js

69 ms

ad_status.js

ad_status.js

429 ms

YjCNJ0mFj9HiCkQt39lQVpZzkP0G8dlYH-ABayRLdFs.js

YjCNJ0mFj9HiCkQt39lQVpZzkP0G8dlYH-ABayRLdFs.js

449 ms

embed.js

embed.js

331 ms

id

id

73 ms

KFOmCnqEu92Fr1Mu4mxP.ttf

KFOmCnqEu92Fr1Mu4mxP.ttf

25 ms

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

24 ms

Accessibility Review

ddl.nl accessibility score

87

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

[aria-hidden="true"] elements contain focusable descendents

High

[aria-*] attributes are not valid or misspelled

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

ddl.nl best practices score

67

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

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

ddl.nl SEO score

90

Search Engine Optimization Advices

Content Best Practices

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

Impact

Issue

High

Links do not have descriptive text

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

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Ddl.nl can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Ddl.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

ddl.nl

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