Access dew21.de. Energie für Dortmund

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%

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.

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 Now

After Optimization

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 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

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

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.

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

These are opportunities to improve keyboard navigation in your application.

High

Heading elements are not in a sequentially-descending order

High

Some elements have a [tabindex] value greater than 0

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

High

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

These items highlight common accessibility best practices.

High

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

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

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

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

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

dew21.de

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:

Report Summary

Performance

Accessibility

Best Practices

SEO

Energie für Dortmund - Strom & Gas von DEW21

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

dew21.de

www.dew21.de

d20a13bb8224a8975e8039a46770393c.css

all.css

uobootstrap.css

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

dew21.de

www.dew21.de

d20a13bb8224a8975e8039a46770393c.css

all.css

uobootstrap.css

uo.css

ConsentOverlay.css

jquery.fancybox.min.css

uo2020.css

uoheaderfooter.css

slim.min.js

popper.js

scripts.js

uomodules.js

bootstrap.min.js

uo.js

ConsentOverlay.js

jquery.fancybox.min.js

uoheader.js

voting.js

72ca6b8e7bf2300333f17360b2e780fa.js

loader.js

uc-block.bundle.js

app.js

api.js

cs_seo.ga.js

dew21bvb.js

uofooter.js

typingEffect.js

dew21.js

style.css

close.png

loading.gif

prev.png

next.png

nm.rules.js

dew21-logo.png

circle_icon_phone.svg

circle_icon_contact.svg

flag-icon-language.svg

burger.svg

burger-x.svg

dew_headerstartseite_licht_1920x615px.jpg

csm_pv-lp-iereckig116c04e767a.jpg