Report Summary

  • 60

    Performance

    Renders faster than
    76% of other websites

  • 84

    Accessibility

    Visual factors better than
    that of 58% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 89

    SEO

    Google-friendlier than
    67% of websites

df.biom.cz

Biom :: biomasa, biopaliva, bioplyn, pelety, kompostování, ...

Page Load Speed

3.4 sec in total

First Response

603 ms

Resources Loaded

2.6 sec

Page Rendered

224 ms

df.biom.cz screenshot

About Website

Visit df.biom.cz now to see the best up-to-date Df Biom content for Czech Republic and also check out these interesting facts you probably never knew about df.biom.cz

Odborný internetový portál zabývající se tématy: biomasa, biopaliva, bioplyn, pelety, kompostování...

Visit df.biom.cz

Key Findings

We analyzed Df.biom.cz page load time and found that the first response time was 603 ms and then it took 2.8 sec to load all DOM resources and completely render a web page. This is a poor result, as 50% of websites can load faster.

Performance Metrics

df.biom.cz performance score

60

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.6 s

32/100

10%

LCP (Largest Contentful Paint)

Value6.5 s

9/100

25%

SI (Speed Index)

Value5.0 s

63/100

10%

TBT (Total Blocking Time)

Value170 ms

93/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value6.6 s

57/100

10%

Network Requests Diagram

df.biom.cz

603 ms

biom.css

317 ms

aajslib.php3

644 ms

jsapi

15 ms

jsview.php3

268 ms

Our browser made a total of 78 requests to load all elements on the main page. We found that 38% of them (30 requests) were addressed to the original Df.biom.cz, 29% (23 requests) were made to Biom.cz and 13% (10 requests) were made to Static.xx.fbcdn.net. The less responsive or slowest element that took the longest time to load (1.5 sec) relates to the external source Biom.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 391.8 kB (41%)

Content Size

944.1 kB

After Optimization

552.3 kB

In fact, the total size of Df.biom.cz main page is 944.1 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. 50% of websites need less resources to load. Images take 605.3 kB which makes up the majority of the site volume.

HTML Optimization

-71%

Potential reduce by 41.9 kB

  • Original 58.6 kB
  • After minification 56.7 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. 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 41.9 kB or 71% of the original size.

Image Optimization

-21%

Potential reduce by 125.8 kB

  • Original 605.3 kB
  • After minification 479.4 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. Obviously, Df Biom needs image optimization as it can save up to 125.8 kB or 21% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-80%

Potential reduce by 201.3 kB

  • Original 252.4 kB
  • After minification 183.7 kB
  • After compression 51.1 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 201.3 kB or 80% of the original size.

CSS Optimization

-82%

Potential reduce by 22.8 kB

  • Original 27.8 kB
  • After minification 20.1 kB
  • After compression 5.0 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. Df.biom.cz needs all CSS files to be minified and compressed as it can save up to 22.8 kB or 82% of the original size.

Requests Breakdown

Number of requests can be reduced by 22 (29%)

Requests Now

76

After Optimization

54

The browser has sent 76 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Df Biom. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

df.biom.cz accessibility score

84

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Best Practices

df.biom.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

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

df.biom.cz SEO score

89

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

Image elements do not have [alt] attributes

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

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    N/A

  • Language Claimed

    CS

  • Encoding

    WINDOWS-1250

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Df.biom.cz can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else), while the claimed language is Czech. Our system also found out that Df.biom.cz main page’s claimed encoding is windows-1250. 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 description is not detected on the main page of Df Biom. 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: