Tools & Wizards About Us
sejn.cz screenshot

Report Summary

  • 84

    Performance

    Renders faster than
    88% of other websites

  • 53

    Accessibility

    Visual factors better than
    that of 22% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 62

    SEO

    Google-friendlier than
    23% of websites

sejn.cz

MILOŠ ŠEJN

Page Load Speed

6 sec in total

First Response

447 ms

Resources Loaded

4.9 sec

Page Rendered

572 ms

sejn.cz screenshot

About Website

Visit sejn.cz now to see the best up-to-date Sejn content and also check out these interesting facts you probably never knew about sejn.cz

ŠEJN

Visit sejn.cz

Key Findings

We analyzed Sejn.cz page load time and found that the first response time was 447 ms and then it took 5.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

sejn.cz performance score

84

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.1 s

47/100

10%

LCP (Largest Contentful Paint)

Value3.2 s

73/100

25%

SI (Speed Index)

Value4.0 s

81/100

10%

TBT (Total Blocking Time)

Value110 ms

97/100

30%

CLS (Cumulative Layout Shift)

Value0.008

100/100

15%

TTI (Time to Interactive)

Value4.3 s

85/100

10%

Network Requests Diagram

sejn.cz

447 ms

style.css

190 ms

lightview.css

191 ms

prototype.js

16 ms

scriptaculous.js

22 ms

Our browser made a total of 129 requests to load all elements on the main page. We found that 94% of them (121 requests) were addressed to the original Sejn.cz, 6% (8 requests) were made to Ajax.googleapis.com. The less responsive or slowest element that took the longest time to load (1.6 sec) belongs to the original domain Sejn.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 230.6 kB (17%)

Content Size

1.4 MB

After Optimization

1.2 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Sejn.cz main page is 1.4 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. 60% of websites need less resources to load. Images take 1.2 MB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 78.5 kB

  • Original 95.3 kB
  • After minification 68.3 kB
  • After compression 16.8 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. This page needs HTML code to be minified as it can gain 27.0 kB, which is 28% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 78.5 kB or 82% of the original size.

Image Optimization

-11%

Potential reduce by 136.6 kB

  • Original 1.2 MB
  • After minification 1.1 MB

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, Sejn needs image optimization as it can save up to 136.6 kB or 11% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-18%

Potential reduce by 14.5 kB

  • Original 79.5 kB
  • After minification 79.2 kB
  • After compression 65.0 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 14.5 kB or 18% of the original size.

CSS Optimization

-24%

Potential reduce by 932 B

  • Original 3.9 kB
  • After minification 3.9 kB
  • After compression 2.9 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. Sejn.cz needs all CSS files to be minified and compressed as it can save up to 932 B or 24% of the original size.

Requests Breakdown

Number of requests can be reduced by 19 (15%)

Requests Now

128

After Optimization

109

  • Images
  • JavaScript
  • CSS

The browser has sent 128 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Sejn. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 9 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

sejn.cz

sejn.cz

447 ms

style.css

style.css

190 ms

lightview.css

lightview.css

191 ms

prototype.js

prototype.js

16 ms

scriptaculous.js

scriptaculous.js

22 ms

lightview.js

lightview.js

285 ms

builder.js

builder.js

6 ms

effects.js

effects.js

7 ms

dragdrop.js

dragdrop.js

33 ms

controls.js

controls.js

35 ms

slider.js

slider.js

10 ms

sound.js

sound.js

10 ms

sejn_top.gif

sejn_top.gif

283 ms

thumb_1719036031.jpg

thumb_1719036031.jpg

192 ms

INSTAGRAM.png

INSTAGRAM.png

285 ms

FACEBOOK.png

FACEBOOK.png

194 ms

YOUTUBE.png

YOUTUBE.png

283 ms

ISSU.png

ISSU.png

285 ms

ARTFACTS.png

ARTFACTS.png

380 ms

ACADEMIA.png

ACADEMIA.png

382 ms

TWITTER.png

TWITTER.png

472 ms

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565 ms

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473 ms

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474 ms

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569 ms

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661 ms

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658 ms

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755 ms

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662 ms

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753 ms

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755 ms

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847 ms

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850 ms

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851 ms

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942 ms

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943 ms

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943 ms

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1127 ms

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1132 ms

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1038 ms

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1129 ms

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1130 ms

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1226 ms

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1234 ms

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1404 ms

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1242 ms

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1324 ms

point.jpg

point.jpg

1313 ms

prev.png

prev.png

1233 ms

topclose.png

topclose.png

1229 ms

close_large.png

close_large.png

1228 ms

close_small.png

close_small.png

1152 ms

loading.gif

loading.gif

1231 ms

inner_slideshow_stop.png

inner_slideshow_stop.png

1214 ms

inner_prev.png

inner_prev.png

1145 ms

inner_next.png

inner_next.png

1137 ms

controller_prev.png

controller_prev.png

1134 ms

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controller_slideshow_stop.png

1132 ms

controller_next.png

controller_next.png

189 ms

controller_slideshow_play.png

controller_slideshow_play.png

189 ms

controller_close.png

controller_close.png

191 ms

Accessibility Review

sejn.cz accessibility score

53

Accessibility Issues

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.

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

sejn.cz best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

sejn.cz SEO score

62

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Links do not have descriptive text

High

Image elements do not have [alt] attributes

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    CS

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Sejn.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 Sejn.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.

Social Sharing Optimization

sejn.cz

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