2.5 sec in total
388 ms
2 sec
113 ms
Welcome to hvezdy.astro.cz homepage info - get ready to check Hvezdy Astro best content for Iran right away, or after learning these important things about hvezdy.astro.cz
Hvězdy - multimediální učební text
Visit hvezdy.astro.czWe analyzed Hvezdy.astro.cz page load time and found that the first response time was 388 ms and then it took 2.2 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.
hvezdy.astro.cz performance score
name
value
score
weighting
Value3.9 s
25/100
10%
Value5.9 s
14/100
25%
Value8.5 s
17/100
10%
Value60 ms
100/100
30%
Value0.035
100/100
15%
Value5.0 s
77/100
10%
388 ms
487 ms
354 ms
241 ms
731 ms
Our browser made a total of 43 requests to load all elements on the main page. We found that 81% of them (35 requests) were addressed to the original Hvezdy.astro.cz, 7% (3 requests) were made to Cdnjs.cloudflare.com and 5% (2 requests) were made to C1.navrcholu.cz. The less responsive or slowest element that took the longest time to load (731 ms) belongs to the original domain Hvezdy.astro.cz.
Page size can be reduced by 367.9 kB (68%)
539.0 kB
171.1 kB
In fact, the total size of Hvezdy.astro.cz main page is 539.0 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. 25% of websites need less resources to load. Javascripts take 396.6 kB which makes up the majority of the site volume.
Potential reduce by 21.7 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 21.7 kB or 75% of the original size.
Potential reduce by 757 B
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. Hvezdy Astro images are well optimized though.
Potential reduce by 269.9 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 269.9 kB or 68% of the original size.
Potential reduce by 75.7 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. Hvezdy.astro.cz needs all CSS files to be minified and compressed as it can save up to 75.7 kB or 84% of the original size.
Number of requests can be reduced by 25 (60%)
42
17
The browser has sent 42 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Hvezdy Astro. 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 from 6 to 1 for CSS and as a result speed up the page load time.
16-charakteristiky
388 ms
jquery-1.7.2.min.js
487 ms
jquery.autocomplete.pack.js
354 ms
jquery.cookie.js
241 ms
jquery-ui-1.7.2.custom.min.js
731 ms
jquery.livequery.js
241 ms
wz_jsgraphics.js
374 ms
highslide.packed.js
482 ms
highslide.css
362 ms
styly.css
475 ms
jquery.autocomplete.css
483 ms
jquery-ui-1.7.2.custom.css
501 ms
astro-compiled.js
594 ms
astro1-compiled.js
602 ms
cookieconsent.min.js
7 ms
code
353 ms
astronomia.gif
122 ms
nextTab-box2.gif
120 ms
close.gif
122 ms
logo_fpe_zcu.gif
122 ms
prechod.png
125 ms
zarovka.gif
122 ms
testy.gif
237 ms
news.gif
239 ms
find.gif
239 ms
charakteristiky.jpg
241 ms
charakteristika.jpg
242 ms
diagram.jpg
245 ms
zareni.jpg
355 ms
sireni.jpg
357 ms
wiki_letter_w.gif
358 ms
hit
225 ms
count.asp
216 ms
indicator.gif
334 ms
controlbar4.gif
335 ms
ga.js
22 ms
__utm.gif
26 ms
print.css
121 ms
dark-floating.css
11 ms
drop-shadow.png
121 ms
zoomout.cur
119 ms
loader.white.gif
121 ms
logo.png
4 ms
hvezdy.astro.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.
Internationalization and localization
These are opportunities to improve the interpretation of your content by users in different locales.
Impact
Issue
<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
Image elements do not have [alt] attributes
Links do not have a discernible name
hvezdy.astro.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
User Experience
Impact
Issue
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
hvezdy.astro.cz SEO score
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
Image elements do not have [alt] attributes
CS
CS
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Hvezdy.astro.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 Hvezdy.astro.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.
hvezdy.astro.cz
Open Graph description is not detected on the main page of Hvezdy Astro. 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: