9.7 sec in total
2.4 sec
6.9 sec
340 ms
Click here to check amazing Kolo 4 U content. Otherwise, check out these important facts you probably never knew about kolo4u.cz
No Service on this IP/SERVER
Visit kolo4u.czWe analyzed Kolo4u.cz page load time and found that the first response time was 2.4 sec and then it took 7.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.
kolo4u.cz performance score
name
value
score
weighting
Value5.0 s
10/100
10%
Value5.3 s
22/100
25%
Value6.2 s
43/100
10%
Value2,640 ms
4/100
30%
Value0
100/100
15%
Value13.8 s
10/100
10%
2446 ms
9 ms
9 ms
137 ms
36 ms
Our browser made a total of 79 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Kolo4u.cz, 28% (22 requests) were made to Static-cdn1.webnode.com and 25% (20 requests) were made to Files.kolo4u.cz. The less responsive or slowest element that took the longest time to load (3.4 sec) relates to the external source Files.kolo4u.cz.
Page size can be reduced by 630.3 kB (45%)
1.4 MB
766.1 kB
In fact, the total size of Kolo4u.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. 55% of websites need less resources to load. Images take 557.5 kB which makes up the majority of the site volume.
Potential reduce by 56.2 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 17.3 kB, which is 26% 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 56.2 kB or 83% of the original size.
Potential reduce by 27.2 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. Kolo 4 U images are well optimized though.
Potential reduce by 291.2 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 291.2 kB or 63% of the original size.
Potential reduce by 255.8 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. Kolo4u.cz needs all CSS files to be minified and compressed as it can save up to 255.8 kB or 83% of the original size.
Number of requests can be reduced by 40 (55%)
73
33
The browser has sent 73 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Kolo 4 U. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and as a result speed up the page load time.
www.kolo4u.cz
2446 ms
analytics.js
9 ms
ga.js
9 ms
style.css
137 ms
functions.js
36 ms
frontend.package.1-2-189.js
162 ms
print.css
31 ms
collect
16 ms
__utm.gif
12 ms
logo_kolo4u.png
1995 ms
4U_SUP_banner_anim_01_120x120_23.gif
739 ms
poll.png
123 ms
anketa_0.php
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50000000.jpg
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ksam001.jpg
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KSAM-54.jpeg
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Avantree_TR801.jpg
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bike-b.png
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KSWP-003-gry.jpg
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DCY-438_1.jpg
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DCY-438_10.jpg
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TDF02Zcity_silv_16ah.jpg
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PUZZLE.jpg
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TDE05Z_red.jpg
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01_pit_b_4_150_100.JPG
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novinka_qstarz_16.gif
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puzzle8ah.jpg
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electron33.jpg
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-%200015.JPG
2713 ms
body.png
5 ms
homepage.png
6 ms
sitemap.png
50 ms
rss.png
49 ms
print.png
50 ms
menutop_bg.gif
5 ms
menutop_separator.jpg
49 ms
cart.gif
7 ms
search_bg.gif
101 ms
button-search.gif
10 ms
h1_bg.gif
15 ms
h1_right_bg.gif
48 ms
shop-item.gif
88 ms
paging.png
88 ms
right-header.gif
88 ms
shop-item-d.gif
87 ms
sidebar-header.gif
87 ms
menu.png
89 ms
shop-item-sidebar.gif
190 ms
pujcovna_02.gif
938 ms
counter_1.php
447 ms
omonitor.php
450 ms
Menu.js
5 ms
Ip1kpurNCmA
119 ms
www-embed-player-vflfNyN_r.css
24 ms
www-embed-player.js
48 ms
base.js
79 ms
Tqng9ngJVK4Gqvh3e602hP-HqlN49KFEUSDtmrOPmWo.js
41 ms
ad_status.js
41 ms
anketa_0.php
342 ms
zN7GBFwfMP4uA6AR0HCoLQ.ttf
40 ms
RxZJdnzeo3R5zSexge8UUaCWcynf_cDxXwCLxiixG1c.ttf
42 ms
counter_1.php
395 ms
omonitor.php
407 ms
counter_1.php
234 ms
0501.gif
234 ms
0502.gif
245 ms
0503.gif
245 ms
0511.gif
441 ms
0512.gif
462 ms
0513.gif
461 ms
loading.gif
8 ms
button-hover.png
139 ms
button-fulltext-hover.png
10 ms
slideshow-start-hover.png
8 ms
counter_1.php
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slideshow-pause-hover.png
5 ms
kolo4u.cz accessibility score
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
<frame> or <iframe> elements do not have a title
Links do not have a discernible name
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
Heading elements are not in a sequentially-descending order
kolo4u.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
Browser errors were logged to the console
Issues were logged in the Issues panel in Chrome Devtools
kolo4u.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 Kolo4u.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 Kolo4u.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.
kolo4u.cz
Open Graph description is not detected on the main page of Kolo 4 U. 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: