Tools & Wizards About Us

Report Summary

  • 55

    Performance

    Renders faster than
    72% of other websites

  • 94

    Accessibility

    Visual factors better than
    that of 83% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

vierfarben.de

Computer und Office | Bücher & E-Books | Rheinwerk Verlag

Page Load Speed

4.5 sec in total

First Response

329 ms

Resources Loaded

3.6 sec

Page Rendered

563 ms

About Website

Welcome to vierfarben.de homepage info - get ready to check Vierfarben best content for Germany right away, or after learning these important things about vierfarben.de

Fachbücher und Ratgeber zu Windows, macOS, Microsoft Office sowie smarte Geräte. Die ganze Computerwelt für Einsteiger ohne Vorwissen. Mit vielen Beispielen.

Visit vierfarben.de

Key Findings

We analyzed Vierfarben.de page load time and found that the first response time was 329 ms and then it took 4.2 sec to load all DOM resources and completely render a web page. This is a poor result, as 65% of websites can load faster.

Performance Metrics

vierfarben.de performance score

55

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.9 s

25/100

10%

LCP (Largest Contentful Paint)

Value4.4 s

39/100

25%

SI (Speed Index)

Value8.1 s

21/100

10%

TBT (Total Blocking Time)

Value260 ms

83/100

30%

CLS (Cumulative Layout Shift)

Value0.101

89/100

15%

TTI (Time to Interactive)

Value10.0 s

27/100

10%

Network Requests Diagram

vierfarben.de

329 ms

633 ms

lightbox.css

513 ms

swiper-bundle.min.css

515 ms

main.css

811 ms

Our browser made a total of 103 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Vierfarben.de, 57% (59 requests) were made to Static.rheinwerk-verlag.de and 38% (39 requests) were made to S3-eu-west-1.amazonaws.com. The less responsive or slowest element that took the longest time to load (959 ms) relates to the external source S3-eu-west-1.amazonaws.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 613.1 kB (32%)

Content Size

1.9 MB

After Optimization

1.3 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Vierfarben.de main page is 1.9 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. 50% of websites need less resources to load. Images take 1.0 MB which makes up the majority of the site volume.

HTML Optimization

-86%

Potential reduce by 143.2 kB

  • Original 165.6 kB
  • After minification 114.1 kB
  • After compression 22.4 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 51.4 kB, which is 31% 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 143.2 kB or 86% of the original size.

Image Optimization

-35%

Potential reduce by 353.5 kB

  • Original 1.0 MB
  • After minification 669.6 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. Obviously, Vierfarben needs image optimization as it can save up to 353.5 kB or 35% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-16%

Potential reduce by 92.3 kB

  • Original 595.1 kB
  • After minification 595.1 kB
  • After compression 502.8 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 92.3 kB or 16% of the original size.

CSS Optimization

-20%

Potential reduce by 24.2 kB

  • Original 118.1 kB
  • After minification 118.1 kB
  • After compression 93.9 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. Vierfarben.de needs all CSS files to be minified and compressed as it can save up to 24.2 kB or 20% of the original size.

Requests Breakdown

Number of requests can be reduced by 52 (51%)

Requests Now

101

After Optimization

49

  • Images
  • JavaScript
  • CSS

The browser has sent 101 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Vierfarben. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 53 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

vierfarben.de accessibility score

94

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Links do not have a discernible name

Best Practices

vierfarben.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

vierfarben.de SEO score

92

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

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 Vierfarben.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 Vierfarben.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 description is not detected on the main page of Vierfarben. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: