Report Summary

  • 54

    Performance

    Renders faster than
    72% of other websites

  • 75

    Accessibility

    Visual factors better than
    that of 42% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 100

    SEO

    Google-friendlier than
    95% of websites

rs-online.cz

RS-Online | Rezervační systémy

Page Load Speed

1.2 sec in total

First Response

441 ms

Resources Loaded

651 ms

Page Rendered

93 ms

rs-online.cz screenshot

About Website

Click here to check amazing RS Online content for Czech Republic. Otherwise, check out these important facts you probably never knew about rs-online.cz

Neomezený rezervační systém vhodný ve sportu, zdravotnictví i službách. Žádná administrativa, mějte podnikání vždy u sebe

Visit rs-online.cz

Key Findings

We analyzed Rs-online.cz page load time and found that the first response time was 441 ms and then it took 744 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 10% of websites can load faster.

Performance Metrics

rs-online.cz performance score

54

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.4 s

17/100

10%

LCP (Largest Contentful Paint)

Value6.1 s

12/100

25%

SI (Speed Index)

Value7.2 s

29/100

10%

TBT (Total Blocking Time)

Value150 ms

94/100

30%

CLS (Cumulative Layout Shift)

Value0.013

100/100

15%

TTI (Time to Interactive)

Value8.8 s

36/100

10%

Network Requests Diagram

rs-online.cz

441 ms

show_ads.js

11 ms

zrt_lookup.html

39 ms

show_ads_impl.js

70 ms

ads

24 ms

Our browser made a total of 6 requests to load all elements on the main page. We found that 17% of them (1 request) were addressed to the original Rs-online.cz, 50% (3 requests) were made to Pagead2.googlesyndication.com and 33% (2 requests) were made to Googleads.g.doubleclick.net. The less responsive or slowest element that took the longest time to load (441 ms) belongs to the original domain Rs-online.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.3 kB (8%)

Content Size

16.5 kB

After Optimization

15.2 kB

In fact, the total size of Rs-online.cz main page is 16.5 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. Only 10% of websites need less resources to load. Javascripts take 14.5 kB which makes up the majority of the site volume.

HTML Optimization

-59%

Potential reduce by 1.2 kB

  • Original 2.0 kB
  • After minification 1.9 kB
  • After compression 819 B

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 1.2 kB or 59% of the original size.

JavaScript Optimization

-1%

Potential reduce by 109 B

  • Original 14.5 kB
  • After minification 14.4 kB
  • After compression 14.4 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. This website has mostly compressed JavaScripts.

Requests Breakdown

We found no issues to fix!

Requests Now

5

After Optimization

5

The browser has sent 5 CSS, Javascripts, AJAX and image requests in order to completely render the main page of RS Online. According to our analytics all requests are already optimized.

Accessibility Review

rs-online.cz accessibility score

75

Accessibility Issues

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

High

Buttons do not have an accessible name

High

Links do not have a discernible name

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Best Practices

rs-online.cz best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

rs-online.cz SEO score

100

Search Engine Optimization Advices

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

High

Document uses legible font sizes

Language and Encoding

  • Language Detected

    CS

  • Language Claimed

    N/A

  • Encoding

    N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Rs-online.cz 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 Rs-online.cz main page’s claimed encoding is . Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

Open Graph description is not detected on the main page of RS Online. 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: