Tools & Wizards About Us
koelner-planetarium.de screenshot

Report Summary

  • 75

    Performance

    Renders faster than
    84% of other websites

  • 32

    Accessibility

    Visual factors better than
    that of 18% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 79

    SEO

    Google-friendlier than
    40% of websites

koelner-planetarium.de

Planetarium Köln

Page Load Speed

1.7 sec in total

First Response

317 ms

Resources Loaded

1.3 sec

Page Rendered

128 ms

koelner-planetarium.de screenshot

About Website

Visit koelner-planetarium.de now to see the best up-to-date Koelner Planetarium content and also check out these interesting facts you probably never knew about koelner-planetarium.de

Planetarium Köln - Informationen zu Führungen des ersten Planetariums Kön mit virtueller Tour durch das Planetarium

Visit koelner-planetarium.de

Key Findings

We analyzed Koelner-planetarium.de page load time and found that the first response time was 317 ms and then it took 1.4 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 25% of websites can load faster.

Performance Metrics

koelner-planetarium.de performance score

75

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.0 s

84/100

10%

LCP (Largest Contentful Paint)

Value5.5 s

18/100

25%

SI (Speed Index)

Value3.4 s

89/100

10%

TBT (Total Blocking Time)

Value50 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value4.9 s

78/100

10%

Network Requests Diagram

koelner-planetarium.de

317 ms

www.koelner-planetarium.de

289 ms

newmain.css

129 ms

bgstar.jpg

110 ms

bgmain.jpg

541 ms

Our browser made a total of 8 requests to load all elements on the main page. We found that all of those requests were addressed to Koelner-planetarium.de and no external sources were called. The less responsive or slowest element that took the longest time to load (541 ms) belongs to the original domain Koelner-planetarium.de.

Page Optimization Overview & Recommendations

Page size can be reduced by 12.2 kB (7%)

Content Size

186.9 kB

After Optimization

174.7 kB

  • HTML
  • Images
  • CSS

In fact, the total size of Koelner-planetarium.de main page is 186.9 kB. This result falls within a vast category (top 1 000 000) of heavyweight, probably not optimized, and thus slow loading web pages. Only 5% of websites need less resources to load. Images take 174.4 kB which makes up the majority of the site volume.

HTML Optimization

-76%

Potential reduce by 6.6 kB

  • Original 8.8 kB
  • After minification 8.6 kB
  • After compression 2.1 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 6.6 kB or 76% of the original size.

Image Optimization

-2%

Potential reduce by 2.8 kB

  • Original 174.4 kB
  • After minification 171.6 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. Koelner Planetarium images are well optimized though.

CSS Optimization

-75%

Potential reduce by 2.8 kB

  • Original 3.7 kB
  • After minification 3.1 kB
  • After compression 922 B

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. Koelner-planetarium.de needs all CSS files to be minified and compressed as it can save up to 2.8 kB or 75% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

6

After Optimization

6

  • Images
  • CSS

The browser has sent 6 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Koelner Planetarium. According to our analytics all requests are already optimized.

Network Requests Diagram

koelner-planetarium.de

koelner-planetarium.de

317 ms

www.koelner-planetarium.de

www.koelner-planetarium.de

289 ms

newmain.css

newmain.css

129 ms

bgstar.jpg

bgstar.jpg

110 ms

bgmain.jpg

bgmain.jpg

541 ms

navi_aktive.jpg

navi_aktive.jpg

235 ms

navi_inaktive.jpg

navi_inaktive.jpg

219 ms

black.png

black.png

239 ms

Accessibility Review

koelner-planetarium.de accessibility score

32

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

Document doesn't have a <title> element

High

Image elements do not have [alt] attributes

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

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

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

koelner-planetarium.de 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

High

Page has valid source maps

SEO Factors

koelner-planetarium.de SEO score

79

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

Document doesn't have a <title> element

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

Language and Encoding

  • Language Detected

    DE

  • Language Claimed

    N/A

  • Encoding

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Koelner-planetarium.de can be misinterpreted by Google and other search engines. Our service has detected that German is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Koelner-planetarium.de main page’s claimed encoding is iso-8859-1. 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

koelner-planetarium.de

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