11 sec in total
2.6 sec
7.9 sec
500 ms
Welcome to osf.cz homepage info - get ready to check OSF best content for Czech Republic right away, or after learning these important things about osf.cz
Visit osf.czWe analyzed Osf.cz page load time and found that the first response time was 2.6 sec and then it took 8.4 sec to load all DOM resources and completely render a web page. This is a poor result, as 85% of websites can load faster.
osf.cz performance score
name
value
score
weighting
Value6.3 s
3/100
10%
Value6.6 s
8/100
25%
Value15.1 s
1/100
10%
Value50 ms
100/100
30%
Value0.04
99/100
15%
Value16.5 s
5/100
10%
2602 ms
122 ms
219 ms
330 ms
226 ms
Our browser made a total of 85 requests to load all elements on the main page. We found that 82% of them (70 requests) were addressed to the original Osf.cz, 12% (10 requests) were made to Fonts.gstatic.com and 2% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (2.9 sec) belongs to the original domain Osf.cz.
Page size can be reduced by 1.6 MB (27%)
5.7 MB
4.2 MB
In fact, the total size of Osf.cz main page is 5.7 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. 70% of websites need less resources to load. Images take 4.8 MB which makes up the majority of the site volume.
Potential reduce by 71.8 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 71.8 kB or 86% of the original size.
Potential reduce by 858.4 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, OSF needs image optimization as it can save up to 858.4 kB or 18% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 308.1 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 308.1 kB or 68% of the original size.
Potential reduce by 318.3 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. Osf.cz needs all CSS files to be minified and compressed as it can save up to 318.3 kB or 86% of the original size.
Number of requests can be reduced by 28 (39%)
72
44
The browser has sent 72 CSS, Javascripts, AJAX and image requests in order to completely render the main page of OSF. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 13 to 1 for JavaScripts and from 10 to 1 for CSS and as a result speed up the page load time.
www.osf.cz
2602 ms
jquery.mmenu.all.css
122 ms
stylesqest.css
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bootstrap.min.css
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jquery.fancybox.min.css
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style.css
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editor-style.css
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www.osf.cz
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styles.css
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settings.css
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jquery.js
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jquery-migrate.js
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jquery.themepunch.tools.min.js
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jquery.themepunch.revolution.min.js
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jquery.form.min.js
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scripts.js
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jquery.mmenu.min.all.js
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jquery.simplyscroll.min.js
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jquery.fancybox.pack.js
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jquery.flexslider-min.js
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main.js
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css
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osf.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 input fields do not have accessible names
Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.
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
Links do not have a discernible name
osf.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
General
Impact
Issue
Detected JavaScript libraries
osf.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
EN
CS
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Osf.cz can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it does not match the claimed Czech language. Our system also found out that Osf.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.
osf.cz
Open Graph description is not detected on the main page of OSF. 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: