3.6 sec in total
289 ms
3.1 sec
209 ms
Click here to check amazing Isob content. Otherwise, check out these important facts you probably never knew about isob.cz
Our mission is to provide Kindergarten to High School students from all over the world with the necessary tools to become committed, lifelong learners and responsible, engaged citizens of the world.
Visit isob.czWe analyzed Isob.cz page load time and found that the first response time was 289 ms and then it took 3.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.
isob.cz performance score
name
value
score
weighting
Value2.1 s
80/100
10%
Value5.7 s
16/100
25%
Value5.4 s
56/100
10%
Value280 ms
80/100
30%
Value0
100/100
15%
Value5.7 s
68/100
10%
289 ms
728 ms
78 ms
100 ms
367 ms
Our browser made a total of 50 requests to load all elements on the main page. We found that 58% of them (29 requests) were addressed to the original Isob.cz, 6% (3 requests) were made to Google-analytics.com and 6% (3 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (1.3 sec) belongs to the original domain Isob.cz.
Page size can be reduced by 348.7 kB (39%)
885.1 kB
536.4 kB
In fact, the total size of Isob.cz main page is 885.1 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. 30% of websites need less resources to load. Images take 409.6 kB which makes up the majority of the site volume.
Potential reduce by 19.1 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 3.9 kB, which is 15% 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 19.1 kB or 76% of the original size.
Potential reduce by 5.0 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. Isob images are well optimized though.
Potential reduce by 103.5 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 103.5 kB or 55% of the original size.
Potential reduce by 221.1 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. Isob.cz needs all CSS files to be minified and compressed as it can save up to 221.1 kB or 84% of the original size.
Number of requests can be reduced by 19 (50%)
38
19
The browser has sent 38 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Isob. 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 as a result speed up the page load time.
en
289 ms
all.css
728 ms
jquery.min.js
78 ms
jquery-ui.min.js
100 ms
bootstrap.min.js
367 ms
anim.js
361 ms
all.js
246 ms
base.js
493 ms
lazyYT.js
246 ms
default.min.js
488 ms
css
62 ms
analytics.js
100 ms
isb.png
128 ms
cz.png
206 ms
resp
1240 ms
resp
1154 ms
resp
1295 ms
cis.png
267 ms
cobis.png
233 ms
cambridge.png
392 ms
msmt.png
344 ms
amcham.png
357 ms
bcc.png
465 ms
brno.png
475 ms
mu.png
511 ms
foreigners.png
586 ms
bec.png
594 ms
bef.png
631 ms
nccc.png
705 ms
euraxess.png
710 ms
Zd2E9abXLFGSr9G3YK2MsDR-eWpsHSw83BRsAQElGgc.ttf
121 ms
b9QBgL0iMZfDSpmcXcE8nL3QFSXBldIn45k5A7iXhnc.ttf
122 ms
b9QBgL0iMZfDSpmcXcE8nDokq8qT6AIiNJ07Vf_NrVA.ttf
122 ms
fontawesome-webfont.woff
1189 ms
glyphicons-halflings-regular.woff
864 ms
collect
99 ms
gtm.js
63 ms
videos
90 ms
sddefault.jpg
75 ms
ui-bg_flat_75_ffffff_40x100.png
636 ms
collect
24 ms
collect
72 ms
conversion_async.js
35 ms
fbds.js
111 ms
retargeting.js
483 ms
30 ms
42 ms
23 ms
retargeting
120 ms
4 ms
isob.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-*] attributes do not have valid values
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.
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
Heading elements are not in a sequentially-descending order
isob.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
Page has valid source maps
isob.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
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Isob.cz can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Isob.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.
isob.cz
Open Graph description is not detected on the main page of Isob. 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: