Tools & Wizards About Us
vierfarben.de screenshot

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

vierfarben.de screenshot

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

vierfarben.de

vierfarben.de

329 ms

633 ms

lightbox.css

lightbox.css

513 ms

swiper-bundle.min.css

swiper-bundle.min.css

515 ms

main.css

main.css

811 ms

require.config.js

require.config.js

518 ms

require.js

require.js

528 ms

rheinwerk365-logo-light.svg

rheinwerk365-logo-light.svg

311 ms

v0985.webp

v0985.webp

405 ms

loading.gif

loading.gif

107 ms

rheinwerk-logo-header.png

rheinwerk-logo-header.png

107 ms

ehi-seal.svg

ehi-seal.svg

107 ms

S0009_Power_BI_Seminar.webp

S0009_Power_BI_Seminar.webp

348 ms

Office_Abo.webp

Office_Abo.webp

364 ms

rheinwerk365-professionalcomputing-logo.svg

rheinwerk365-professionalcomputing-logo.svg

315 ms

rheinwerk365-onlinemarketing-logo.svg

rheinwerk365-onlinemarketing-logo.svg

335 ms

rheinwerk365-officewindows-logo.svg

rheinwerk365-officewindows-logo.svg

333 ms

rheinwerk365-sappress-logo.svg

rheinwerk365-sappress-logo.svg

340 ms

v0990.webp

v0990.webp

344 ms

Seminare_allgemein.webp

Seminare_allgemein.webp

603 ms

9783842109650_171_2d.jpg

9783842109650_171_2d.jpg

394 ms

9783842109605_171_2d.jpg

9783842109605_171_2d.jpg

423 ms

9783836293242_171_2d.jpg

9783836293242_171_2d.jpg

414 ms

v0935_xl_lp.png

v0935_xl_lp.png

669 ms

v0910_s.png

v0910_s.png

536 ms

9783842108257_171_2d.jpg

9783842108257_171_2d.jpg

482 ms

9783836295796_171_2d.jpg

9783836295796_171_2d.jpg

513 ms

9783842106956_171_2d.jpg

9783842106956_171_2d.jpg

513 ms

9783842107809_171_2d.jpg

9783842107809_171_2d.jpg

576 ms

9783842109155_171_2d.jpg

9783842109155_171_2d.jpg

604 ms

9783842108950_171_2d.jpg

9783842108950_171_2d.jpg

624 ms

9783842108608_171_2d.jpg

9783842108608_171_2d.jpg

626 ms

9783842108509_171_2d.jpg

9783842108509_171_2d.jpg

669 ms

9783842108653_171_2d.jpg

9783842108653_171_2d.jpg

702 ms

M_Excel%20im%20Controlling.png

M_Excel%20im%20Controlling.png

855 ms

M_Datenvisualisierung.png

M_Datenvisualisierung.png

863 ms

9324_s.png

9324_s.png

715 ms

9783836288255_171_2d.jpg

9783836288255_171_2d.jpg

754 ms

9783836290593_171_2d.jpg

9783836290593_171_2d.jpg

765 ms

9783836286909_171_2d.jpg

9783836286909_171_2d.jpg

784 ms

9783842108806_171_2d.jpg

9783842108806_171_2d.jpg

795 ms

8690_xl.png

8690_xl.png

858 ms

9783842109803_171_2d.jpg

9783842109803_171_2d.jpg

862 ms

9783842109858_171_2d.jpg

9783842109858_171_2d.jpg

880 ms

9783842109353_171_2d.jpg

9783842109353_171_2d.jpg

878 ms

9783842109506_171_2d.jpg

9783842109506_171_2d.jpg

954 ms

9783842109308_171_2d.jpg

9783842109308_171_2d.jpg

942 ms

9783842108202_171_2d.jpg

9783842108202_171_2d.jpg

959 ms

9783836297332_171_2d.jpg

9783836297332_171_2d.jpg

956 ms

knockout.js

knockout.js

200 ms

knockout.mapping-latest.js

knockout.mapping-latest.js

104 ms

main_12.5.1.js

main_12.5.1.js

949 ms

settings.js

settings.js

167 ms

9783842109902_171_2d.jpg

9783842109902_171_2d.jpg

677 ms

9733_xl_lila.png

9733_xl_lila.png

746 ms

9697_s.png

9697_s.png

884 ms

domReady.js

domReady.js

99 ms

jquery.js

jquery.js

201 ms

ProductSet.js

ProductSet.js

103 ms

Topicpage.js

Topicpage.js

99 ms

TopicpageView.js

TopicpageView.js

99 ms

HeaderBlockView.js

HeaderBlockView.js

102 ms

BlockBannerTrackingView.js

BlockBannerTrackingView.js

195 ms

underscore.js

underscore.js

193 ms

backbone.extensions.js

backbone.extensions.js

100 ms

AuthorSet.js

AuthorSet.js

112 ms

BannerSet.js

BannerSet.js

111 ms

BlockSet.js

BlockSet.js

193 ms

Block.js

Block.js

194 ms

BaseView.js

BaseView.js

194 ms

BlockView.js

BlockView.js

195 ms

DialogView.js

DialogView.js

204 ms

Product.js

Product.js

202 ms

SliderTrackingView.js

SliderTrackingView.js

287 ms

swiper-bundle.dist.min.js

swiper-bundle.dist.min.js

482 ms

googleEcommerce.js

googleEcommerce.js

201 ms

jqueryViewportCheckerGroup.js

jqueryViewportCheckerGroup.js

199 ms

jquery.extensions.js

jquery.extensions.js

202 ms

backbone.js

backbone.js

193 ms

Author.js

Author.js

284 ms

Banner.js

Banner.js

280 ms

PubSub.js

PubSub.js

201 ms

ListView.js

ListView.js

204 ms

HeaderView.js

HeaderView.js

206 ms

BlockEditorView.js

BlockEditorView.js

297 ms

text.js

text.js

291 ms

googletracking.js

googletracking.js

200 ms

jquery.viewportchecker.js

jquery.viewportchecker.js

207 ms

ListItemView.js

ListItemView.js

104 ms

HeaderListView.js

HeaderListView.js

184 ms

AutoCompleteProductView.js

AutoCompleteProductView.js

98 ms

AutoCompleteAuthorView.js

AutoCompleteAuthorView.js

100 ms

BannerUploadView.js

BannerUploadView.js

99 ms

BannerEditorView.js

BannerEditorView.js

101 ms

S3UploadView.js

S3UploadView.js

102 ms

dialog.jst.js

dialog.jst.js

179 ms

block_editor.jst.js

block_editor.jst.js

184 ms

HeaderListItemView.js

HeaderListItemView.js

105 ms

AutoCompleteView.js

AutoCompleteView.js

98 ms

BannerBackgroundUploadView.js

BannerBackgroundUploadView.js

99 ms

s3upload.js

s3upload.js

98 ms

banner_editor.jst.js

banner_editor.jst.js

181 ms

AutoCompleteItemView.js

AutoCompleteItemView.js

98 ms

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

vierfarben.de

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: