5.6 sec in total
433 ms
5 sec
126 ms
Visit osa.cz now to see the best up-to-date OSA content for Czech Republic and also check out these interesting facts you probably never knew about osa.cz
Visit osa.czWe analyzed Osa.cz page load time and found that the first response time was 433 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 70% of websites can load faster.
osa.cz performance score
name
value
score
weighting
Value2.2 s
77/100
10%
Value3.9 s
53/100
25%
Value3.9 s
82/100
10%
Value170 ms
93/100
30%
Value0.026
100/100
15%
Value4.3 s
84/100
10%
433 ms
1990 ms
297 ms
447 ms
314 ms
Our browser made a total of 31 requests to load all elements on the main page. We found that 94% of them (29 requests) were addressed to the original Osa.cz, 6% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (2 sec) belongs to the original domain Osa.cz.
Page size can be reduced by 87.3 kB (19%)
455.2 kB
367.9 kB
In fact, the total size of Osa.cz main page is 455.2 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 393.8 kB which makes up the majority of the site volume.
Potential reduce by 19.9 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 19.9 kB or 78% of the original size.
Potential reduce by 53.5 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, OSA needs image optimization as it can save up to 53.5 kB or 14% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 3.1 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 3.1 kB or 14% 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. Osa.cz needs all CSS files to be minified and compressed as it can save up to 10.8 kB or 73% of the original size.
Number of requests can be reduced by 13 (45%)
29
16
The browser has sent 29 CSS, Javascripts, AJAX and image requests in order to completely render the main page of OSA. 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 8 to 1 for CSS and as a result speed up the page load time.
osa.cz
433 ms
www.osa.cz
1990 ms
top-bottom.css
297 ms
common.css
447 ms
other-templates.css
314 ms
homepage.css
345 ms
left-menu.css
343 ms
content-wysiwyg.css
446 ms
roll-down.css
472 ms
white-bar-wysiwyg.css
506 ms
left_menu_handle.js
1060 ms
login_view.js
600 ms
size_adjustments.js
598 ms
roll_down_handle.js
619 ms
flash_detect.js
627 ms
common.js
525 ms
ga.js
24 ms
title-logo3.png
167 ms
www.osa.cz
503 ms
white-bar.png
170 ms
gastro_final.jpg
473 ms
sluzby.jpg
2000 ms
lazne_ubytovacizarizeni.jpg
531 ms
vyuka_sport.jpg
1730 ms
internet_mobil.jpg
777 ms
vyroba.jpg
624 ms
pristroje_media.jpg
656 ms
horizontal-separator.png
693 ms
facebook.png
773 ms
youtube.png
810 ms
__utm.gif
23 ms
osa.cz accessibility score
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
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.
Best practices
These items highlight common accessibility best practices.
Impact
Issue
[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.
osa.cz best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
osa.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
Tap targets are not sized appropriately
CS
CS
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Osa.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 Osa.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.
osa.cz
Open Graph description is not detected on the main page of OSA. 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: