7.6 sec in total
501 ms
6.4 sec
640 ms
Welcome to cz.o2.com homepage info - get ready to check Cz O2 best content for Germany right away, or after learning these important things about cz.o2.com
O2 nabízí výhodné volání, široké pokrytí i rychlost internetu a další telekomunikační služby. Jejich kombinací i nákupem on-line ušetříte, spojte si služby v O2 Spolu. Zařiďte vše v aplikaci Moje O2.
Visit cz.o2.comWe analyzed Cz.o2.com page load time and found that the first response time was 501 ms and then it took 7.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.
cz.o2.com performance score
name
value
score
weighting
Value5.2 s
8/100
10%
Value21.3 s
0/100
25%
Value24.5 s
0/100
10%
Value17,540 ms
0/100
30%
Value0
100/100
15%
Value38.3 s
0/100
10%
501 ms
347 ms
572 ms
224 ms
261 ms
Our browser made a total of 158 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Cz.o2.com, 47% (75 requests) were made to O2.cz and 10% (16 requests) were made to Static.xx.fbcdn.net. The less responsive or slowest element that took the longest time to load (2.8 sec) relates to the external source O2.cz.
Page size can be reduced by 1.6 MB (39%)
4.1 MB
2.5 MB
In fact, the total size of Cz.o2.com main page is 4.1 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. 65% of websites need less resources to load. Images take 2.4 MB which makes up the majority of the site volume.
Potential reduce by 53.5 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 53.5 kB or 71% of the original size.
Potential reduce by 314.2 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, Cz O2 needs image optimization as it can save up to 314.2 kB or 13% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 766.0 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 766.0 kB or 75% of the original size.
Potential reduce by 441.5 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. Cz.o2.com needs all CSS files to be minified and compressed as it can save up to 441.5 kB or 77% of the original size.
Number of requests can be reduced by 68 (45%)
152
84
The browser has sent 152 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Cz O2. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 35 to 1 for JavaScripts and from 12 to 1 for CSS and as a result speed up the page load time.
cz.o2.com
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cz.o2.com 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
[aria-*] attributes do not have valid values
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
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
Image elements do not have [alt] attributes
Links do not have a discernible name
cz.o2.com 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
Page has valid source maps
cz.o2.com 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
CS
N/A
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Cz.o2.com can be misinterpreted by Google and other search engines. Our service has detected that Czech is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Cz.o2.com 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.
cz.o2.com
Open Graph data is detected on the main page of Cz O2. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: