Tools & Wizards About Us
chemiezauber.de screenshot

Report Summary

  • 67

    Performance

    Renders faster than
    80% of other websites

  • 88

    Accessibility

    Visual factors better than
    that of 69% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 92

    SEO

    Google-friendlier than
    75% of websites

chemiezauber.de

Home - Chemiezauber.de

Page Load Speed

5.6 sec in total

First Response

369 ms

Resources Loaded

4.9 sec

Page Rendered

343 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 369 ms and then it took 5.2 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

chemiezauber.de performance score

67

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.8 s

26/100

10%

LCP (Largest Contentful Paint)

Value4.0 s

49/100

25%

SI (Speed Index)

Value5.7 s

51/100

10%

TBT (Total Blocking Time)

Value150 ms

95/100

30%

CLS (Cumulative Layout Shift)

Value0.123

83/100

15%

TTI (Time to Interactive)

Value6.0 s

65/100

10%

Network Requests Diagram

chemiezauber.de

369 ms

chemiezauber.de

1687 ms

gzip.php

240 ms

default.css

760 ms

default.css

1174 ms

Our browser made a total of 104 requests to load all elements on the main page. We found that 92% of them (96 requests) were addressed to the original Chemiezauber.de, 2% (2 requests) were made to Fonts.gstatic.com and 2% (2 requests) were made to Ssl.google-analytics.com. The less responsive or slowest element that took the longest time to load (1.7 sec) belongs to the original domain Chemiezauber.de.

Page Optimization Overview & Recommendations

Page size can be reduced by 575.0 kB (42%)

Content Size

1.4 MB

After Optimization

790.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Chemiezauber.de main page is 1.4 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. Javascripts take 724.5 kB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 34.1 kB

  • Original 44.2 kB
  • After minification 43.1 kB
  • After compression 10.1 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 34.1 kB or 77% of the original size.

Image Optimization

-7%

Potential reduce by 40.5 kB

  • Original 576.1 kB
  • After minification 535.6 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. Chemiezauber images are well optimized though.

JavaScript Optimization

-67%

Potential reduce by 483.7 kB

  • Original 724.5 kB
  • After minification 723.4 kB
  • After compression 240.7 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 483.7 kB or 67% of the original size.

CSS Optimization

-80%

Potential reduce by 16.7 kB

  • Original 20.8 kB
  • After minification 18.4 kB
  • After compression 4.1 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 16.7 kB or 80% of the original size.

Requests Breakdown

Number of requests can be reduced by 46 (47%)

Requests Now

98

After Optimization

52

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 98 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 23 to 1 for JavaScripts and from 17 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

chemiezauber.de

chemiezauber.de

369 ms

chemiezauber.de

chemiezauber.de

1687 ms

gzip.php

gzip.php

240 ms

default.css

default.css

760 ms

default.css

default.css

1174 ms

gzip.php

gzip.php

419 ms

gzip.php

gzip.php

457 ms

jcemediabox.css

jcemediabox.css

309 ms

style.css

style.css

320 ms

gzip.php

gzip.php

500 ms

gzip.php

gzip.php

485 ms

gzip.php

gzip.php

534 ms

gzip.php

gzip.php

541 ms

style.css

style.css

520 ms

phocadownload.css

phocadownload.css

557 ms

nova.css

nova.css

586 ms

style.css

style.css

607 ms

gzip.php

gzip.php

768 ms

gzip.php

gzip.php

778 ms

gzip.php

gzip.php

786 ms

default.js

default.js

1380 ms

default.js

default.js

1374 ms

gzip.php

gzip.php

763 ms

gzip.php

gzip.php

796 ms

gzip.php

gzip.php

833 ms

gzip.php

gzip.php

959 ms

jcemediabox.js

jcemediabox.js

970 ms

gzip.php

gzip.php

1109 ms

gzip.php

gzip.php

1041 ms

gzip.php

gzip.php

1016 ms

gzip.php

gzip.php

1073 ms

gzip.php

gzip.php

1227 ms

gzip.php

gzip.php

1226 ms

swfobject.js

swfobject.js

1119 ms

jquery.fpss.js

jquery.fpss.js

1144 ms

jquery.tools.min.js

jquery.tools.min.js

1226 ms

psm.js

psm.js

1227 ms

gzip.php

gzip.php

1312 ms

css

css

62 ms

gzip.php

gzip.php

1466 ms

search.js

search.js

1266 ms

lightbox.js

lightbox.js

353 ms

mediaelement-and-player.js

mediaelement-and-player.js

410 ms

spotlight.js

spotlight.js

362 ms

www.chemiezauber.de

www.chemiezauber.de

378 ms

merke-klein.png

merke-klein.png

333 ms

close0.png

close0.png

333 ms

twitter.png

twitter.png

335 ms

Banner-chemiezauber06-mit-Reagenzglas.png

Banner-chemiezauber06-mit-Reagenzglas.png

376 ms

intro.png

intro.png

542 ms

Natrium-228b5b2909.png

Natrium-228b5b2909.png

387 ms

Alles%20Chemie-4ff252b5dd.png

Alles%20Chemie-4ff252b5dd.png

387 ms

Schwefel-5086996eb8.png

Schwefel-5086996eb8.png

410 ms

Ciz-logo-spende.png

Ciz-logo-spende.png

449 ms

list_star.png

list_star.png

407 ms

box_download.png

box_download.png

405 ms

radial_gradient.svg

radial_gradient.svg

408 ms

linear_gradient.svg

linear_gradient.svg

464 ms

layer_1.png

layer_1.png

617 ms

layer_2.png

layer_2.png

507 ms

list_check.png

list_check.png

508 ms

list_line.png

list_line.png

509 ms

nav.png

nav.png

574 ms

list_icon.png

list_icon.png

596 ms

bird.png

bird.png

641 ms

DroidSans-webfont.woff

DroidSans-webfont.woff

589 ms

YDAoLskQQ5MOAgvHUQCcLbvy90DtE_Pg_qiF9bHvTzw.ttf

YDAoLskQQ5MOAgvHUQCcLbvy90DtE_Pg_qiF9bHvTzw.ttf

270 ms

We_iSDqttE3etzfdfhuPRX4NhRhUVU1NOvrEWRXSCoI.ttf

We_iSDqttE3etzfdfhuPRX4NhRhUVU1NOvrEWRXSCoI.ttf

271 ms

ga.js

ga.js

288 ms

slideshow.js

slideshow.js

435 ms

popup.html

popup.html

419 ms

tooltip.html

tooltip.html

434 ms

folder-home-klein.png

folder-home-klein.png

437 ms

g-book.png

g-book.png

444 ms

nautilus.png

nautilus.png

437 ms

news-blog-klein.png

news-blog-klein.png

443 ms

gnome-eyes-applet.png

gnome-eyes-applet.png

517 ms

suchen.png

suchen.png

524 ms

Handwerkszeug-klein.png

Handwerkszeug-klein.png

541 ms

Kugelwolkenmodell-klein.png

Kugelwolkenmodell-klein.png

540 ms

kristallgitter-klein.png

kristallgitter-klein.png

542 ms

zitrone-klein.png

zitrone-klein.png

552 ms

ozonloch2008-klein.png

ozonloch2008-klein.png

624 ms

weinglas-thumb.png

weinglas-thumb.png

622 ms

Fotolia_28212810_XS-wahlpflicht-thumb.png

Fotolia_28212810_XS-wahlpflicht-thumb.png

639 ms

Fotolia_41570797_XS-dns-klein.png

Fotolia_41570797_XS-dns-klein.png

643 ms

Fotolia_41437435_XS-am-menschen-klein.png

Fotolia_41437435_XS-am-menschen-klein.png

588 ms

strom1-klein.png

strom1-klein.png

605 ms

Kuehlschrank_klein.png

Kuehlschrank_klein.png

668 ms

Fotolia_34960782_XS-video-klein.png

Fotolia_34960782_XS-video-klein.png

671 ms

schriftlicher-auftrag.gif

schriftlicher-auftrag.gif

666 ms

__utm.gif

__utm.gif

24 ms

lexikon-klein.png

lexikon-klein.png

627 ms

Atom-kl.png

Atom-kl.png

639 ms

links-kl.png

links-kl.png

648 ms

forum.png

forum.png

705 ms

collect

collect

69 ms

suche.png

suche.png

657 ms

ga-audiences

ga-audiences

61 ms

icon-new.png

icon-new.png

637 ms

registrieren.png

registrieren.png

632 ms

Daumen-hoch-klein.png

Daumen-hoch-klein.png

643 ms

pfeil-drehend-rechts.gif

pfeil-drehend-rechts.gif

527 ms

natrium.png

natrium.png

679 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: