11.9 sec in total
393 ms
9.6 sec
1.9 sec
Welcome to web.o2.cz homepage info - get ready to check Web O2 best content for Czech Republic right away, or after learning these important things about web.o2.cz
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 web.o2.czWe analyzed Web.o2.cz page load time and found that the first response time was 393 ms and then it took 11.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.
web.o2.cz performance score
name
value
score
weighting
Value4.6 s
13/100
10%
Value13.2 s
0/100
25%
Value10.2 s
8/100
10%
Value1,850 ms
9/100
30%
Value0.004
100/100
15%
Value21.7 s
1/100
10%
393 ms
395 ms
812 ms
865 ms
294 ms
Our browser made a total of 120 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Web.o2.cz, 83% (100 requests) were made to O2.cz and 5% (6 requests) were made to S.o2.cz. The less responsive or slowest element that took the longest time to load (3.3 sec) relates to the external source O2.cz.
Page size can be reduced by 634.6 kB (41%)
1.6 MB
920.6 kB
In fact, the total size of Web.o2.cz 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. 50% of websites need less resources to load. Images take 791.2 kB which makes up the majority of the site volume.
Potential reduce by 204.7 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 204.7 kB or 79% of the original size.
Potential reduce by 257.2 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, Web O2 needs image optimization as it can save up to 257.2 kB or 33% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 172.1 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 172.1 kB or 40% of the original size.
Potential reduce by 602 B
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. Web.o2.cz has all CSS files already compressed.
Number of requests can be reduced by 18 (17%)
107
89
The browser has sent 107 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Web 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 19 to 1 for JavaScripts and as a result speed up the page load time.
web.o2.cz
393 ms
www.o2.cz
395 ms
osobni
812 ms
index.scss
865 ms
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294 ms
index.js
60 ms
launch-EN01534af7e30646e8b078ac64dc75500b.min.js
18 ms
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cmp.php
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cmp_final.min.js
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exponea.min.js
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AppMeasurement.min.js
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AppMeasurement_Module_ActivityMap.min.js
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gtm.js
143 ms
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actions.js
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persoo.js
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persoo-ui.js
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ncas-init.js
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bV8xLndfMzQ1MjAucl9HRFBSLmxfY3Mudi5wLnRfMTY3ODgueHRfMjUy.js
379 ms
workflow.js
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persooAutocomplete.js
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OnAir-Bold.woff
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box-bg.jpg
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box-1-object-mobile.png
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box-2-object-mobile.png
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box-4-bg.jpg
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workflow.js
92 ms
RC304d1437ce8b4a6abf22884e95aaa7c6-source.min.js
3 ms
web.o2.cz 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
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
web.o2.cz best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Displays images with incorrect aspect ratio
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
Missing source maps for large first-party JavaScript
web.o2.cz SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
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
Document uses legible font sizes
CS
CS
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Web.o2.cz can be misinterpreted by Google and other search engines. Our service has detected that Czech is used on the page, and it matches the claimed language. Our system also found out that Web.o2.cz 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.
web.o2.cz
Open Graph data is detected on the main page of Web O2. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: