Tools & Wizards About Us
chemiezauber.de screenshot

Report Summary

  • 46

    Performance

    Renders faster than
    65% of other websites

  • 88

    Accessibility

    Visual factors better than
    that of 68% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

chemiezauber.de

Home - Chemiezauber.de

Page Load Speed

14.5 sec in total

First Response

338 ms

Resources Loaded

13.9 sec

Page Rendered

328 ms

chemiezauber.de screenshot

About Website

Click here to check amazing Chemiezauber content for Germany. Otherwise, check out these important facts you probably never knew about chemiezauber.de

Schulchemie im Kontext, von Klasse 7 bis zum Abitur, für Sekundarschulen und Gymnasien. Interaktive Unterrichtshilfe für Schülerinnen und Schüler; Plattform für Lehrerinnen und Lehrer der Chemie (dida...

Visit chemiezauber.de

Key Findings

We analyzed Chemiezauber.de page load time and found that the first response time was 338 ms and then it took 14.2 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.

Performance Metrics

chemiezauber.de performance score

46

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.7 s

31/100

10%

LCP (Largest Contentful Paint)

Value6.3 s

11/100

25%

SI (Speed Index)

Value7.5 s

26/100

10%

TBT (Total Blocking Time)

Value460 ms

61/100

30%

CLS (Cumulative Layout Shift)

Value0.123

83/100

15%

TTI (Time to Interactive)

Value5.7 s

68/100

10%

Network Requests Diagram

chemiezauber.de

338 ms

chemiezauber.de

4986 ms

zoo.css

461 ms

jquery.qtip.css

952 ms

jcemediabox.min.css

485 ms

Our browser made a total of 130 requests to load all elements on the main page. We found that 94% of them (122 requests) were addressed to the original Chemiezauber.de, 2% (3 requests) were made to App.usercentrics.eu and 1% (1 request) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (5 sec) belongs to the original domain Chemiezauber.de.

Page Optimization Overview & Recommendations

Page size can be reduced by 327.5 kB (21%)

Content Size

1.6 MB

After Optimization

1.3 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Chemiezauber.de main page is 1.6 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. 60% of websites need less resources to load. Images take 746.6 kB which makes up the majority of the site volume.

HTML Optimization

-86%

Potential reduce by 245.4 kB

  • Original 285.9 kB
  • After minification 283.0 kB
  • After compression 40.5 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 245.4 kB or 86% of the original size.

Image Optimization

-7%

Potential reduce by 55.5 kB

  • Original 746.6 kB
  • After minification 691.1 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. Chemiezauber images are well optimized though.

JavaScript Optimization

-3%

Potential reduce by 13.0 kB

  • Original 454.2 kB
  • After minification 454.2 kB
  • After compression 441.2 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

-13%

Potential reduce by 13.5 kB

  • Original 103.7 kB
  • After minification 103.1 kB
  • After compression 90.1 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. Chemiezauber.de needs all CSS files to be minified and compressed as it can save up to 13.5 kB or 13% of the original size.

Requests Breakdown

Number of requests can be reduced by 74 (59%)

Requests Now

125

After Optimization

51

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 125 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Chemiezauber. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 21 to 1 for JavaScripts and from 41 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

chemiezauber.de

chemiezauber.de

338 ms

chemiezauber.de

chemiezauber.de

4986 ms

zoo.css

zoo.css

461 ms

jquery.qtip.css

jquery.qtip.css

952 ms

jcemediabox.min.css

jcemediabox.min.css

485 ms

widgetkit-a7b90218.css

widgetkit-a7b90218.css

469 ms

bootstrap.css

bootstrap.css

570 ms

bootstrap.css

bootstrap.css

1110 ms

fontawesome.css

fontawesome.css

934 ms

template.css

template.css

936 ms

kunenalatest.css

kunenalatest.css

938 ms

jquery.min.js

jquery.min.js

1077 ms

jquery-noconflict.js

jquery-noconflict.js

1180 ms

jquery-migrate.min.js

jquery-migrate.min.js

1181 ms

responsive.js

responsive.js

1169 ms

default.js

default.js

1165 ms

jquery.qtip.js

jquery.qtip.js

1250 ms

bootstrap.min.js

bootstrap.min.js

1271 ms

core.js

core.js

1291 ms

jcemediabox.min.js

jcemediabox.min.js

2099 ms

widgetkit-9a36e908.js

widgetkit-9a36e908.js

1296 ms

keepalive.js

keepalive.js

1292 ms

ct-functions.js

ct-functions.js

1415 ms

main.js

main.js

26 ms

base.css

base.css

1426 ms

layout.css

layout.css

1404 ms

menus.css

menus.css

1405 ms

modules.css

modules.css

1407 ms

tools.css

tools.css

1515 ms

system.css

system.css

1516 ms

extensions.css

extensions.css

1519 ms

custom.css

custom.css

1525 ms

bubbles_blue.css

bubbles_blue.css

1536 ms

footer.css

footer.css

1628 ms

animations.css

animations.css

1965 ms

blue.css

blue.css

1630 ms

droidsans.css

droidsans.css

1638 ms

yanonekaffeesatzthin.css

yanonekaffeesatzthin.css

1957 ms

js

js

65 ms

adsbygoogle.js

adsbygoogle.js

53 ms

droidsans.css

droidsans.css

1972 ms

style.css

style.css

1289 ms

print.css

print.css

1283 ms

droidsans.css

droidsans.css

1476 ms

yanonekaffeesatzthin.css

yanonekaffeesatzthin.css

1385 ms

category.css

category.css

1176 ms

item.css

item.css

1173 ms

author.css

author.css

1174 ms

submission.css

submission.css

1161 ms

custom.js

custom.js

1106 ms

warp.js

warp.js

1829 ms

accordionmenu.js

accordionmenu.js

1781 ms

dropdownmenu.js

dropdownmenu.js

1777 ms

template.js

template.js

1093 ms

lightbox.js

lightbox.js

789 ms

mediaelement-and-player.js

mediaelement-and-player.js

902 ms

spotlight.js

spotlight.js

791 ms

bundle.js

bundle.js

14 ms

base.css

base.css

894 ms

layout.css

layout.css

902 ms

menus.css

menus.css

903 ms

modules.css

modules.css

903 ms

tools.css

tools.css

904 ms

system.css

system.css

1006 ms

system.css

system.css

1404 ms

system-all.css

system-all.css

1407 ms

print.css

print.css

1002 ms

1px.png

1px.png

8 ms

de.json

de.json

166 ms

de

de

134 ms

graphql

graphql

97 ms

footer_dark.png

footer_dark.png

220 ms

toolbar_bg.png

toolbar_bg.png

218 ms

Banner-chemiezauber06-mit-Reagenzglas.png

Banner-chemiezauber06-mit-Reagenzglas.png

310 ms

icons_social.png

icons_social.png

219 ms

menu_line_item.png

menu_line_item.png

219 ms

menu_dropdown_level1.png

menu_dropdown_level1.png

217 ms

list_star.png

list_star.png

2704 ms

radial_gradient.svg

radial_gradient.svg

2633 ms

linear_gradient.svg

linear_gradient.svg

2636 ms

layer_1.png

layer_1.png

2854 ms

layer_2.png

layer_2.png

2745 ms

intro.png

intro.png

3133 ms

list_check.png

list_check.png

2871 ms

list_line.png

list_line.png

2872 ms

nav.png

nav.png

2880 ms

Arbeitsb-Fotolia-150_8181349f2a6727e1a3d30d0d20dce54f.png

Arbeitsb-Fotolia-150_8181349f2a6727e1a3d30d0d20dce54f.png

2874 ms

news-blog1.png

news-blog1.png

3064 ms

module_badges.png

module_badges.png

3060 ms

module_icons.png

module_icons.png

3348 ms

list_icon.png

list_icon.png

2986 ms

module_fabric.png

module_fabric.png

3348 ms

module_line.png

module_line.png

3348 ms

Natrium-228b5b2909.png

Natrium-228b5b2909.png

3353 ms

Alles%20Chemie-4ff252b5dd.png

Alles%20Chemie-4ff252b5dd.png

3353 ms

Schwefel-5086996eb8.png

Schwefel-5086996eb8.png

3356 ms

bottom_dark.png

bottom_dark.png

3838 ms

module_line_dark.png

module_line_dark.png

3460 ms

IMG_29012-k.jpg

IMG_29012-k.jpg

4186 ms

totop_scroller.png

totop_scroller.png

3826 ms

DroidSans-webfont.woff

DroidSans-webfont.woff

3748 ms

Yanonekaffeesatz-thin-webfont.woff

Yanonekaffeesatz-thin-webfont.woff

3765 ms

slideshow.js

slideshow.js

3731 ms

close.png

close.png

3781 ms

blank.gif

blank.gif

3780 ms

nautilus.png

nautilus.png

3756 ms

links-kl.png

links-kl.png

3752 ms

forum.png

forum.png

3750 ms

suche.png

suche.png

3873 ms

icon-new.png

icon-new.png

3866 ms

Atom-kl.png

Atom-kl.png

3876 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

4285 ms

Handwerkszeug-klein.png

Handwerkszeug-klein.png

3781 ms

Kugelwolkenmodell-klein.png

Kugelwolkenmodell-klein.png

1576 ms

kristallgitter-klein.png

kristallgitter-klein.png

1577 ms

zitrone-klein.png

zitrone-klein.png

1529 ms

ozonloch2008-klein.png

ozonloch2008-klein.png

1497 ms

weinglas-thumb.png

weinglas-thumb.png

1472 ms

Fotolia_28212810_XS-wahlpflicht-thumb.png

Fotolia_28212810_XS-wahlpflicht-thumb.png

1483 ms

Fotolia_41570797_XS-dns-klein.png

Fotolia_41570797_XS-dns-klein.png

1472 ms

Fotolia_41437435_XS-am-menschen-klein.png

Fotolia_41437435_XS-am-menschen-klein.png

1473 ms

strom1-klein.png

strom1-klein.png

1478 ms

Kuehlschrank_klein.png

Kuehlschrank_klein.png

1459 ms

Fotolia_34960782_XS-video-klein.png

Fotolia_34960782_XS-video-klein.png

1408 ms

Daumen-hoch-klein.png

Daumen-hoch-klein.png

1407 ms

shop.png

shop.png

1347 ms

shop-20.png

shop-20.png

1130 ms

glyphicons-halflings.png

glyphicons-halflings.png

1258 ms

pfeil-drehend-rechts.gif

pfeil-drehend-rechts.gif

707 ms

natrium.png

natrium.png

1045 ms

Accessibility Review

chemiezauber.de accessibility score

88

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

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

chemiezauber.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

Missing source maps for large first-party JavaScript

SEO Factors

chemiezauber.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

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 Chemiezauber.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 Chemiezauber.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

chemiezauber.de

Open Graph description is not detected on the main page of Chemiezauber. 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: