Report Summary

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    Best Practices

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Přehledy, informace a tak na

Page Load Speed

2.3 sec in total

First Response

375 ms

Resources Loaded

1.7 sec

Page Rendered

176 ms screenshot

About Website

Click here to check amazing I Prehled content. Otherwise, check out these important facts you probably never knew about

Kromě poznámek, přehledů a informací se zde můžete setkat prakticky s čímkoliv, co se nehodilo na žádný jiný web autora Libora Smékala.


Key Findings

We analyzed page load time and found that the first response time was 375 ms and then it took 1.9 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 30% of websites can load faster.

Performance Metrics performance score


Network Requests Diagram

375 ms

408 ms


123 ms


225 ms


45 ms

Our browser made a total of 27 requests to load all elements on the main page. We found that 4% of them (1 request) were addressed to the original, 19% (5 requests) were made to and 19% (5 requests) were made to The less responsive or slowest element that took the longest time to load (408 ms) relates to the external source

Page Optimization Overview & Recommendations

Page size can be reduced by 76.6 kB (49%)

Content Size

155.7 kB

After Optimization

79.1 kB

In fact, the total size of main page is 155.7 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. 35% of websites need less resources to load. Javascripts take 122.0 kB which makes up the majority of the site volume.

HTML Optimization


Potential reduce by 9.5 kB

  • Original 15.5 kB
  • After minification 15.2 kB
  • After compression 6.0 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 9.5 kB or 61% of the original size.

Image Optimization


Potential reduce by 390 B

  • Original 14.9 kB
  • After minification 14.5 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. I Prehled images are well optimized though.

JavaScript Optimization


Potential reduce by 64.6 kB

  • Original 122.0 kB
  • After minification 121.9 kB
  • After compression 57.4 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 64.6 kB or 53% of the original size.

CSS Optimization


Potential reduce by 2.1 kB

  • Original 3.3 kB
  • After minification 3.3 kB
  • After compression 1.2 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. needs all CSS files to be minified and compressed as it can save up to 2.1 kB or 63% of the original size.

Requests Breakdown

Number of requests can be reduced by 9 (41%)

Requests Now


After Optimization


The browser has sent 22 CSS, Javascripts, AJAX and image requests in order to completely render the main page of I Prehled. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 10 to 1 for JavaScripts and as a result speed up the page load time.

SEO Factors SEO score


Language and Encoding

  • Language Detected


  • Language Claimed


  • Encoding


Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 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 main page’s claimed encoding is iso-8859-1. 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 data is detected on the main page of I Prehled. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: