2.3 sec in total
447 ms
1.7 sec
145 ms
Click here to check amazing TZW content for Germany. Otherwise, check out these important facts you probably never knew about tzw.de
Wir forschen, beraten und prüfen. Das TZW entwickelt Lösungen und Konzepte für alle Bereiche der Wasserbranche.
Visit tzw.deWe analyzed Tzw.de page load time and found that the first response time was 447 ms and then it took 1.9 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.
tzw.de performance score
name
value
score
weighting
Value4.3 s
18/100
10%
Value18.6 s
0/100
25%
Value23.2 s
0/100
10%
Value22,620 ms
0/100
30%
Value0.012
100/100
15%
Value31.9 s
0/100
10%
447 ms
100 ms
6 ms
195 ms
196 ms
Our browser made a total of 42 requests to load all elements on the main page. We found that 79% of them (33 requests) were addressed to the original Tzw.de, 10% (4 requests) were made to Timm4.de and 10% (4 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (575 ms) belongs to the original domain Tzw.de.
Page size can be reduced by 193.1 kB (40%)
484.4 kB
291.3 kB
In fact, the total size of Tzw.de main page is 484.4 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. 20% of websites need less resources to load. Images take 374.1 kB which makes up the majority of the site volume.
Potential reduce by 8.1 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 8.1 kB or 67% of the original size.
Potential reduce by 121.4 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, TZW needs image optimization as it can save up to 121.4 kB or 32% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 52.8 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 52.8 kB or 64% of the original size.
Potential reduce by 10.8 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. Tzw.de needs all CSS files to be minified and compressed as it can save up to 10.8 kB or 70% of the original size.
Number of requests can be reduced by 31 (79%)
39
8
The browser has sent 39 CSS, Javascripts, AJAX and image requests in order to completely render the main page of TZW. 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 16 to 1 for CSS and as a result speed up the page load time.
tzw.de
447 ms
screen.css
100 ms
jquery-latest.min.js
6 ms
ajax.js
195 ms
basics.js
196 ms
big_img.js
197 ms
png_fix.js
216 ms
tooltip.js
218 ms
basics.css
100 ms
layout.css
188 ms
box_meldung.css
193 ms
box_mitte.css
194 ms
box_rechts.css
194 ms
boxes.css
197 ms
links.css
199 ms
nav.css
278 ms
timm4_mailer.css
290 ms
png_fix.js
413 ms
tooltip.js
430 ms
analytics.js
46 ms
bg.png
100 ms
gradient.png
197 ms
logo.png
482 ms
606421_DVGW_Logo.jpg
103 ms
605457_tzw-aussenansicht.png
575 ms
mail.gif
93 ms
6_info.png
185 ms
2_at.png
196 ms
12_tzw-de.png
198 ms
v-card.gif
278 ms
map.gif
294 ms
loader.gif
292 ms
collect
12 ms
collect
14 ms
collect
13 ms
print.css
99 ms
basics.css
101 ms
box_meldung.css
102 ms
box_mitte.css
101 ms
box_rechts.css
102 ms
links.css
100 ms
big_img_bg.png
101 ms
tzw.de accessibility score
ARIA
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
Impact
Issue
[aria-*] attributes do not match their roles
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
Buttons do not have an accessible name
<frame> or <iframe> elements do not have a title
Image elements do not have [alt] attributes
Links do not have a discernible name
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
Heading elements are not in a sequentially-descending order
tzw.de best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
Missing source maps for large first-party JavaScript
tzw.de SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
Links are not crawlable
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
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
Document uses legible font sizes
Tap targets are not sized appropriately
DE
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Tzw.de can be misinterpreted by Google and other search engines. Our service has detected that German is used on the page, and it does not match the claimed English language. Our system also found out that Tzw.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.
tzw.de
Open Graph description is not detected on the main page of TZW. 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: