Tools & Wizards About Us
biolib.cz screenshot

Report Summary

  • 97

    Performance

    Renders faster than
    94% of other websites

  • 84

    Accessibility

    Visual factors better than
    that of 56% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 75

    SEO

    Google-friendlier than
    32% of websites

biolib.cz

Taxonomic tree of plants and animals with photos | BioLib.cz

Page Load Speed

3.8 sec in total

First Response

489 ms

Resources Loaded

3.1 sec

Page Rendered

161 ms

biolib.cz screenshot

About Website

Visit biolib.cz now to see the best up-to-date Bio Lib content for Russia and also check out these interesting facts you probably never knew about biolib.cz

Mezinárodní encyklopedie rostlin, hub a živočichů. Vedle taxonomického systému nabízí i bohatou galerii fotografií, výkladový a překladový slovník, databázi odkazů, biotopů a chráněných území, diskuzn...

Visit biolib.cz

Key Findings

We analyzed Biolib.cz page load time and found that the first response time was 489 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 60% of websites can load faster.

Performance Metrics

biolib.cz performance score

97

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.0 s

83/100

10%

LCP (Largest Contentful Paint)

Value2.0 s

97/100

25%

SI (Speed Index)

Value2.2 s

99/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value2.0 s

99/100

10%

Network Requests Diagram

biolib.cz

489 ms

biolib.cz

420 ms

www.biolib.cz

1084 ms

style2.min.css

97 ms

scripts.min.js

194 ms

Our browser made a total of 44 requests to load all elements on the main page. We found that 89% of them (39 requests) were addressed to the original Biolib.cz, 5% (2 requests) were made to Googletagmanager.com and 5% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (1.1 sec) belongs to the original domain Biolib.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 39.3 kB (36%)

Content Size

110.8 kB

After Optimization

71.4 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Biolib.cz main page is 110.8 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. 15% of websites need less resources to load. Images take 38.7 kB which makes up the majority of the site volume.

HTML Optimization

-70%

Potential reduce by 16.6 kB

  • Original 23.8 kB
  • After minification 22.6 kB
  • After compression 7.2 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. 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 16.6 kB or 70% of the original size.

Image Optimization

-8%

Potential reduce by 3.2 kB

  • Original 38.7 kB
  • After minification 35.5 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. Bio Lib images are well optimized though.

JavaScript Optimization

-23%

Potential reduce by 7.2 kB

  • Original 31.6 kB
  • After minification 31.6 kB
  • After compression 24.3 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 7.2 kB or 23% of the original size.

CSS Optimization

-74%

Potential reduce by 12.3 kB

  • Original 16.7 kB
  • After minification 16.7 kB
  • After compression 4.4 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. Biolib.cz needs all CSS files to be minified and compressed as it can save up to 12.3 kB or 74% of the original size.

Requests Breakdown

Number of requests can be reduced by 18 (44%)

Requests Now

41

After Optimization

23

  • Images
  • JavaScript
  • CSS

The browser has sent 41 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Bio Lib. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 7 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

biolib.cz

biolib.cz

489 ms

biolib.cz

biolib.cz

420 ms

www.biolib.cz

www.biolib.cz

1084 ms

style2.min.css

style2.min.css

97 ms

scripts.min.js

scripts.min.js

194 ms

scripts-cz.js

scripts-cz.js

286 ms

consent.min.js

consent.min.js

287 ms

jquery-1.11.2.min.js

jquery-1.11.2.min.js

18 ms

gtm.js

gtm.js

86 ms

shad.gif

shad.gif

117 ms

home.gif

home.gif

115 ms

help.gif

help.gif

116 ms

sitemap.gif

sitemap.gif

131 ms

bllogo.gif

bllogo.gif

224 ms

CZflag.gif

CZflag.gif

224 ms

ENflag.gif

ENflag.gif

224 ms

mapsavcicr2.gif

mapsavcicr2.gif

260 ms

mapherpcr2.gif

mapherpcr2.gif

411 ms

maprybycr2.gif

maprybycr2.gif

371 ms

mapbezobratlicr2.gif

mapbezobratlicr2.gif

372 ms

maphoubycr2.gif

maphoubycr2.gif

387 ms

_1973.jpg

_1973.jpg

323 ms

_362903.jpg

_362903.jpg

358 ms

_266055.jpg

_266055.jpg

419 ms

_188597.jpg

_188597.jpg

453 ms

_70357.jpg

_70357.jpg

470 ms

_256203.jpg

_256203.jpg

471 ms

_42878.jpg

_42878.jpg

482 ms

_43275.jpg

_43275.jpg

507 ms

_499758.jpg

_499758.jpg

520 ms

1.gif

1.gif

579 ms

banner.gif

banner.gif

607 ms

barside1.gif

barside1.gif

541 ms

c4.gif

c4.gif

551 ms

bullnavy.gif

bullnavy.gif

576 ms

mainheaderwinter2006.gif

mainheaderwinter2006.gif

692 ms

cl2.gif

cl2.gif

636 ms

cr2.gif

cr2.gif

647 ms

ico-social.png

ico-social.png

660 ms

net.gif

net.gif

671 ms

js

js

48 ms

analytics.js

analytics.js

19 ms

collect

collect

3 ms

stylep.min.css

stylep.min.css

98 ms

Accessibility Review

biolib.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.

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

Best Practices

biolib.cz best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

SEO Factors

biolib.cz SEO score

75

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Page is blocked from indexing

High

robots.txt is not valid

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

Language and Encoding

  • Language Detected

    CS

  • Language Claimed

    CS

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Biolib.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 Biolib.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.

Social Sharing Optimization

biolib.cz

Open Graph description is not detected on the main page of Bio Lib. 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: