Tools & Wizards About Us
rahner-edu.de screenshot

Report Summary

  • 69

    Performance

    Renders faster than
    80% of other websites

  • 67

    Accessibility

    Visual factors better than
    that of 32% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 70

    SEO

    Google-friendlier than
    30% of websites

rahner-edu.de

Elektronik Grundlagen Lernmaterial - Mikrocontroller Raspberry Pi micro:bit - Propeller P1 P2 - Arduino Grove - Basic Stamp BASCOM - Halbleiterschaltu...

Page Load Speed

3.8 sec in total

First Response

733 ms

Resources Loaded

2.7 sec

Page Rendered

437 ms

rahner-edu.de screenshot

About Website

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

Elektronik Grundlagen Lernmaterial, Mikrocontroller Raspberry Pi micro:bit, Propeller P1 P2 , Arduino Grove, Basic Stamp Bascom, Halbleiterschaltungen, Physik Technik, MINT Robotik

Visit rahner-edu.de

Key Findings

We analyzed Rahner-edu.de page load time and found that the first response time was 733 ms and then it took 3.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.

Performance Metrics

rahner-edu.de performance score

69

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.0 s

24/100

10%

LCP (Largest Contentful Paint)

Value4.3 s

41/100

25%

SI (Speed Index)

Value5.0 s

63/100

10%

TBT (Total Blocking Time)

Value60 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.133

80/100

15%

TTI (Time to Interactive)

Value4.3 s

85/100

10%

Network Requests Diagram

www.rahner-edu.de

733 ms

style.css

444 ms

theming.css

196 ms

web.css

455 ms

common,shoppingbasket

472 ms

Our browser made a total of 23 requests to load all elements on the main page. We found that 35% of them (8 requests) were addressed to the original Rahner-edu.de, 57% (13 requests) were made to Cdn.website-start.de and 9% (2 requests) were made to 120.sb.mywebsite-editor.com. The less responsive or slowest element that took the longest time to load (980 ms) relates to the external source Cdn.website-start.de.

Page Optimization Overview & Recommendations

Page size can be reduced by 174.2 kB (32%)

Content Size

536.6 kB

After Optimization

362.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Rahner-edu.de main page is 536.6 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 25% of websites need less resources to load. Images take 330.7 kB which makes up the majority of the site volume.

HTML Optimization

-87%

Potential reduce by 139.7 kB

  • Original 160.3 kB
  • After minification 158.4 kB
  • After compression 20.6 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 139.7 kB or 87% of the original size.

Image Optimization

-4%

Potential reduce by 13.6 kB

  • Original 330.7 kB
  • After minification 317.2 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. Rahner Edu images are well optimized though.

JavaScript Optimization

-49%

Potential reduce by 18.9 kB

  • Original 38.7 kB
  • After minification 38.7 kB
  • After compression 19.7 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 18.9 kB or 49% of the original size.

CSS Optimization

-27%

Potential reduce by 1.9 kB

  • Original 7.0 kB
  • After minification 7.0 kB
  • After compression 5.0 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. Rahner-edu.de needs all CSS files to be minified and compressed as it can save up to 1.9 kB or 27% of the original size.

Requests Breakdown

Number of requests can be reduced by 12 (55%)

Requests Now

22

After Optimization

10

  • Images
  • JavaScript
  • CSS

The browser has sent 22 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Rahner Edu. 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 from 7 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

www.rahner-edu.de

www.rahner-edu.de

733 ms

style.css

style.css

444 ms

theming.css

theming.css

196 ms

web.css

web.css

455 ms

common,shoppingbasket

common,shoppingbasket

472 ms

mobilenavigation.css

mobilenavigation.css

475 ms

logstate2-css.php

logstate2-css.php

479 ms

logstate-js.php

logstate-js.php

487 ms

web.js

web.js

980 ms

web.bundle.js

web.bundle.js

475 ms

mobilenavigation.js

mobilenavigation.js

542 ms

common,shoppingbasket

common,shoppingbasket

750 ms

799 ms

pfcsupport.js

pfcsupport.js

579 ms

background.gif

background.gif

129 ms

print.css

print.css

108 ms

emotionheader.JPG

emotionheader.JPG

357 ms

cache_1389206.png

cache_1389206.png

318 ms

cache_3357816.png

cache_3357816.png

571 ms

cache_3357994.JPG

cache_3357994.JPG

466 ms

cache_3357712.JPG

cache_3357712.JPG

534 ms

printer.gif

printer.gif

104 ms

logo.gif

logo.gif

103 ms

Accessibility Review

rahner-edu.de accessibility score

67

Accessibility Issues

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.

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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

rahner-edu.de best practices score

75

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

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

rahner-edu.de SEO score

70

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

High

robots.txt is not valid

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

    DE

  • Language Claimed

    DE

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Rahner-edu.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 Rahner-edu.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

rahner-edu.de

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