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name

value

score

weighting

FCP (First Contentful Paint)

Value3.9 s

25/100

10%

LCP (Largest Contentful Paint)

Value13.9 s

0/100

25%

SI (Speed Index)

Value13.3 s

2/100

10%

TBT (Total Blocking Time)

Value2,210 ms

6/100

30%

CLS (Cumulative Layout Shift)

Value0.119

84/100

15%

TTI (Time to Interactive)

Value21.5 s

1/100

10%

duf-online.de

379 ms

Our browser made a total of 1 request to load all elements on the main page. We found that all of those requests were addressed to Duf-online.de and no external sources were called. The less responsive or slowest element that took the longest time to load (379 ms) belongs to the original domain Duf-online.de.

Content Size

189.3 kB

After Optimization

123.1 kB

In fact, the total size of Duf-online.de main page is 189.3 kB. This result falls within the top 5000 of lightweight and thus fast loading web pages. Only a small number of websites need less resources to load. Javascripts take 93.9 kB which makes up the majority of the site volume.

HTML Optimization

-44%

Potential reduce by 166 B

Original 376 B
After minification 373 B
After compression 210 B

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 166 B or 44% of the original size.

Image Optimization

-0%

Potential reduce by 178 B

Original 79.5 kB
After minification 79.3 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. Duf Online images are well optimized though.

JavaScript Optimization

-58%

Potential reduce by 54.1 kB

Original 93.9 kB
After minification 92.0 kB
After compression 39.7 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 54.1 kB or 58% of the original size.

CSS Optimization

-75%

Potential reduce by 11.7 kB

Original 15.6 kB
After minification 9.9 kB
After compression 3.9 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. Duf-online.de needs all CSS files to be minified and compressed as it can save up to 11.7 kB or 75% of the original size.

Requests Now

After Optimization

Besides the initial HTML request, no CSS, Javascripts, AJAX or image files were requested in the course of web page rendering.

Accessibility Issues

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.

High

[aria-*] attributes do not match their roles

High

Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.

High

[role]s are not contained by their required parent element

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

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.

High

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

These are opportunities to improve keyboard navigation in your application.

High

Heading elements are not in a sequentially-descending order

Areas of Improvement

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

Search Engine Optimization Advices

To appear in search results, crawlers need access to your app.

High

Links are not crawlable

High

robots.txt is not valid

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/).

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

Language Detected

DE
Language Claimed

DE
Encoding

N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Duf-online.de can be misinterpreted by Google and other search engines. Our service has detected that German is used on the page, and it matches the claimed language. Our system also found out that Duf-online.de main page’s claimed encoding is . 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

duf-online.de

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