Report Summary

  • 16

    Performance

    Renders faster than
    30% of other websites

  • 57

    Accessibility

    Visual factors better than
    that of 24% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

dew21.de

Energie für Dortmund - Strom & Gas von DEW21

Page Load Speed

6.1 sec in total

First Response

227 ms

Resources Loaded

4.6 sec

Page Rendered

1.2 sec

dew21.de screenshot

About Website

Visit dew21.de now to see the best up-to-date DEW21 content for Germany and also check out these interesting facts you probably never knew about dew21.de

Ob Strom, Gas, Wärme, Wasser, oder Elektromobilität - Die Dortmunder Energie- und Wasserversorgung GmbH ist Ihr Energieanbieter in Dortmund und der Region.

Visit dew21.de

Key Findings

We analyzed Dew21.de page load time and found that the first response time was 227 ms and then it took 5.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.

Performance Metrics

dew21.de performance score

16

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.4 s

1/100

10%

LCP (Largest Contentful Paint)

Value13.7 s

0/100

25%

SI (Speed Index)

Value13.6 s

2/100

10%

TBT (Total Blocking Time)

Value4,160 ms

1/100

30%

CLS (Cumulative Layout Shift)

Value0.009

100/100

15%

TTI (Time to Interactive)

Value24.2 s

0/100

10%

Network Requests Diagram

dew21.de

227 ms

www.dew21.de

665 ms

d20a13bb8224a8975e8039a46770393c.css

105 ms

all.css

595 ms

uobootstrap.css

780 ms

Our browser made a total of 106 requests to load all elements on the main page. We found that 82% of them (87 requests) were addressed to the original Dew21.de, 5% (5 requests) were made to Youtube-nocookie.com and 2% (2 requests) were made to App.usercentrics.eu. The less responsive or slowest element that took the longest time to load (3.5 sec) relates to the external source Cdn.stadtwerk.bot.

Page Optimization Overview & Recommendations

Page size can be reduced by 787.5 kB (6%)

Content Size

12.4 MB

After Optimization

11.6 MB

In fact, the total size of Dew21.de main page is 12.4 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. Only a small number of websites need less resources to load. Images take 11.5 MB which makes up the majority of the site volume.

HTML Optimization

-87%

Potential reduce by 148.2 kB

  • Original 170.9 kB
  • After minification 135.7 kB
  • After compression 22.7 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 35.3 kB, which is 21% 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 148.2 kB or 87% of the original size.

Image Optimization

-6%

Potential reduce by 635.4 kB

  • Original 11.5 MB
  • After minification 10.9 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. DEW21 images are well optimized though.

JavaScript Optimization

-1%

Potential reduce by 3.9 kB

  • Original 648.7 kB
  • After minification 648.7 kB
  • After compression 644.9 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. This website has mostly compressed JavaScripts.

CSS Optimization

-0%

Potential reduce by 0 B

  • Original 58.6 kB
  • After minification 58.6 kB
  • After compression 58.6 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. Dew21.de has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 42 (43%)

Requests Now

98

After Optimization

56

The browser has sent 98 CSS, Javascripts, AJAX and image requests in order to completely render the main page of DEW21. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 28 to 1 for JavaScripts and from 10 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

dew21.de accessibility score

57

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

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

High

[aria-*] attributes do not have valid values

High

ARIA IDs are not unique

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

Low

No form fields have multiple labels

High

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

High

Form elements do not have associated labels

High

Links do not have a discernible name

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

High

Some elements have a [tabindex] value greater than 0

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

dew21.de best practices score

83

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

Missing source maps for large first-party JavaScript

SEO Factors

dew21.de 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

    DE

  • Language Claimed

    DE

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Dew21.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 Dew21.de 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 data is detected on the main page of DEW21. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: