Tools & Wizards About Us
ewi.uni-koeln.de screenshot

Report Summary

  • 81

    Performance

    Renders faster than
    86% of other websites

  • 77

    Accessibility

    Visual factors better than
    that of 44% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

ewi.uni-koeln.de

Energiewirtschaftliches Institut an der Universität zu Köln (EWI)

Page Load Speed

5.2 sec in total

First Response

570 ms

Resources Loaded

4.1 sec

Page Rendered

550 ms

ewi.uni-koeln.de screenshot

About Website

Welcome to ewi.uni-koeln.de homepage info - get ready to check EWI Uni Koeln best content for Germany right away, or after learning these important things about ewi.uni-koeln.de

Das EWI betreibt anwendungsnahe Forschung zur Energieökonomik und führt Forschungs- und Beratungsprojekte für Wissenschaft, Wirtschaft und Politik durch.

Visit ewi.uni-koeln.de

Key Findings

We analyzed Ewi.uni-koeln.de page load time and found that the first response time was 570 ms and then it took 4.7 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.

Performance Metrics

ewi.uni-koeln.de performance score

81

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.5 s

67/100

10%

LCP (Largest Contentful Paint)

Value3.2 s

73/100

25%

SI (Speed Index)

Value5.9 s

47/100

10%

TBT (Total Blocking Time)

Value80 ms

99/100

30%

CLS (Cumulative Layout Shift)

Value0.001

100/100

15%

TTI (Time to Interactive)

Value6.1 s

63/100

10%

Network Requests Diagram

570 ms

style.css

224 ms

flag-de.png

345 ms

flag-en.png

346 ms

logo-en.svg

346 ms

Our browser made a total of 41 requests to load all elements on the main page. We found that 98% of them (40 requests) were addressed to the original Ewi.uni-koeln.de, 2% (1 request) were made to Sibforms.com. The less responsive or slowest element that took the longest time to load (1 sec) belongs to the original domain Ewi.uni-koeln.de.

Page Optimization Overview & Recommendations

Page size can be reduced by 123.9 kB (9%)

Content Size

1.4 MB

After Optimization

1.3 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Ewi.uni-koeln.de main page is 1.4 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. 40% of websites need less resources to load. Images take 1.1 MB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 57.8 kB

  • Original 71.0 kB
  • After minification 70.4 kB
  • After compression 13.2 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 57.8 kB or 81% of the original size.

Image Optimization

-6%

Potential reduce by 66.1 kB

  • Original 1.1 MB
  • After minification 1.0 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. EWI Uni Koeln images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 52 B

  • Original 238.4 kB
  • After minification 238.3 kB
  • After compression 238.3 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 21.4 kB
  • After minification 21.4 kB
  • After compression 21.4 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. Ewi.uni-koeln.de has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 11 (29%)

Requests Now

38

After Optimization

27

  • Images
  • JavaScript
  • CSS

The browser has sent 38 CSS, Javascripts, AJAX and image requests in order to completely render the main page of EWI Uni Koeln. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 7 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

570 ms

style.css

style.css

224 ms

flag-de.png

flag-de.png

345 ms

flag-en.png

flag-en.png

346 ms

logo-en.svg

logo-en.svg

346 ms

main.js

main.js

44 ms

Header_EWI-Insights_web-720x405.png

Header_EWI-Insights_web-720x405.png

945 ms

Foto_EON_Thuega-720x405.png

Foto_EON_Thuega-720x405.png

671 ms

Foto_ERK_web-720x403.jpg

Foto_ERK_web-720x403.jpg

544 ms

AdobeStock_90714257_web-720x403.jpg

AdobeStock_90714257_web-720x403.jpg

546 ms

ERK_Foto_web-720x405.jpg

ERK_Foto_web-720x405.jpg

554 ms

AdobeStock_747337091_web-720x405.jpg

AdobeStock_747337091_web-720x405.jpg

660 ms

Header_EWI-Insights__frame3-720x405.jpg

Header_EWI-Insights__frame3-720x405.jpg

767 ms

AdobeStock_257173087_web-720x405.jpg

AdobeStock_257173087_web-720x405.jpg

657 ms

Foto_Merit-Order-720x405.jpg

Foto_Merit-Order-720x405.jpg

772 ms

config.js

config.js

667 ms

klaro.js

klaro.js

667 ms

watcher.js

watcher.js

678 ms

jquery.min.js

jquery.min.js

778 ms

jquery-migrate.min.js

jquery-migrate.min.js

790 ms

main-min.js

main-min.js

793 ms

search.svg

search.svg

639 ms

x.svg

x.svg

692 ms

linkedin.svg

linkedin.svg

785 ms

pattern.png

pattern.png

786 ms

header-home.jpg

header-home.jpg

860 ms

header-home-mobile.jpg

header-home-mobile.jpg

788 ms

grey-arrow-left.svg

grey-arrow-left.svg

786 ms

grey-arrow-right.svg

grey-arrow-right.svg

787 ms

icon-digitalisierung-dezentralisierung-black.svg

icon-digitalisierung-dezentralisierung-black.svg

860 ms

icon-energiemaerkte-energietraeger-black.svg

icon-energiemaerkte-energietraeger-black.svg

854 ms

icon-dekarbonisierung-sektorenkopplung-black.svg

icon-dekarbonisierung-sektorenkopplung-black.svg

864 ms

icon-marktdesign-regulierung-black.svg

icon-marktdesign-regulierung-black.svg

869 ms

jrf-logo-trans-en.png

jrf-logo-trans-en.png

877 ms

innovativ-siegel-en.png

innovativ-siegel-en.png

972 ms

lato-v16-latin-regular.woff

lato-v16-latin-regular.woff

994 ms

lato-v16-latin-700.woff

lato-v16-latin-700.woff

1021 ms

number-of-the-month-arrow-2.svg

number-of-the-month-arrow-2.svg

918 ms

number-of-the-month-arrow-1.svg

number-of-the-month-arrow-1.svg

919 ms

x-circle.svg

x-circle.svg

898 ms

linkedin-circle.svg

linkedin-circle.svg

991 ms

Accessibility Review

ewi.uni-koeln.de accessibility score

77

Accessibility Issues

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

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Best Practices

ewi.uni-koeln.de 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

ewi.uni-koeln.de SEO score

92

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

Image elements do not have [alt] attributes

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 Ewi.uni-koeln.de 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 Ewi.uni-koeln.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

ewi.uni-koeln.de

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