Tools & Wizards About Us
bi.cz screenshot

Report Summary

  • 58

    Performance

    Renders faster than
    74% of other websites

  • 82

    Accessibility

    Visual factors better than
    that of 52% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 62

    SEO

    Google-friendlier than
    23% of websites

bi.cz

Jazyková škola, jazykové a odborné kurzy, pomaturitní studium, firemní školení | BOHEMIA INSTITUT

Page Load Speed

22.7 sec in total

First Response

323 ms

Resources Loaded

22 sec

Page Rendered

318 ms

bi.cz screenshot

About Website

Welcome to bi.cz homepage info - get ready to check Bi best content right away, or after learning these important things about bi.cz

BOHEMIA INSTITUT od roku 1991 nabízí širokou škálu otevřeného mezi-profesního post-sekundárního a celoživotního vzdělání, které vychází z aktuální potřeby a trendů českého i mezinárodního vzdělávacího...

Visit bi.cz

Key Findings

We analyzed Bi.cz page load time and found that the first response time was 323 ms and then it took 22.4 sec to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster. Unfortunately, there was 1 request timeout, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

Performance Metrics

bi.cz performance score

58

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.4 s

36/100

10%

LCP (Largest Contentful Paint)

Value4.2 s

44/100

25%

SI (Speed Index)

Value6.9 s

33/100

10%

TBT (Total Blocking Time)

Value300 ms

79/100

30%

CLS (Cumulative Layout Shift)

Value0.072

96/100

15%

TTI (Time to Interactive)

Value10.6 s

23/100

10%

Network Requests Diagram

bi.cz

323 ms

bi.cz

389 ms

www.bi.cz

723 ms

bohemia-institut.css

95 ms

swfobject.js

190 ms

Our browser made a total of 77 requests to load all elements on the main page. We found that 57% of them (44 requests) were addressed to the original Bi.cz, 12% (9 requests) were made to Static.xx.fbcdn.net and 10% (8 requests) were made to App.livechatoo.com. The less responsive or slowest element that took the longest time to load (20.3 sec) relates to the external source Toplist.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 67.4 kB (13%)

Content Size

526.0 kB

After Optimization

458.6 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Bi.cz main page is 526.0 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. 45% of websites need less resources to load. Images take 362.9 kB which makes up the majority of the site volume.

HTML Optimization

-73%

Potential reduce by 31.8 kB

  • Original 43.5 kB
  • After minification 41.6 kB
  • After compression 11.8 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 31.8 kB or 73% of the original size.

Image Optimization

-10%

Potential reduce by 34.7 kB

  • Original 362.9 kB
  • After minification 328.2 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. Bi images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 350 B

  • Original 116.7 kB
  • After minification 116.7 kB
  • After compression 116.4 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. This website has mostly compressed JavaScripts.

CSS Optimization

-19%

Potential reduce by 530 B

  • Original 2.8 kB
  • After minification 2.8 kB
  • After compression 2.3 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. Bi.cz needs all CSS files to be minified and compressed as it can save up to 530 B or 19% of the original size.

Requests Breakdown

Number of requests can be reduced by 35 (49%)

Requests Now

71

After Optimization

36

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 71 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Bi. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 20 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

bi.cz

bi.cz

323 ms

bi.cz

bi.cz

389 ms

www.bi.cz

www.bi.cz

723 ms

bohemia-institut.css

bohemia-institut.css

95 ms

swfobject.js

swfobject.js

190 ms

script.js

script.js

284 ms

webtoolkit.url.js

webtoolkit.url.js

284 ms

conversion.js

conversion.js

514 ms

fbevents.js

fbevents.js

33 ms

icon-garantovano.png

icon-garantovano.png

667 ms

bgvertical.gif

bgvertical.gif

95 ms

logo.gif

logo.gif

96 ms

mnu-home.gif

mnu-home.gif

131 ms

mnu-mapa.gif

mnu-mapa.gif

94 ms

mnu-spr.gif

mnu-spr.gif

188 ms

menu3-no.gif

menu3-no.gif

190 ms

foreign.gif

foreign.gif

190 ms

seky.gif

seky.gif

224 ms

facebook.gif

facebook.gif

282 ms

klub75x75.gif

klub75x75.gif

283 ms

parneri.gif

parneri.gif

282 ms

esf2.gif

esf2.gif

283 ms

virtualni-prochazka--banner.gif

virtualni-prochazka--banner.gif

317 ms

j6-GALERIE_ok_naweb.jpg

j6-GALERIE_ok_naweb.jpg

375 ms

bS-letni-kurzy-anglictiny_maly-web.jpg

bS-letni-kurzy-anglictiny_maly-web.jpg

376 ms

pomaturitni-kurzy.gif

pomaturitni-kurzy.gif

377 ms

akreditace.gif

akreditace.gif

376 ms

anketa.gif

anketa.gif

410 ms

bis.gif

bis.gif

468 ms

hlava1.gif

hlava1.gif

562 ms

hlava2.gif

hlava2.gif

470 ms

hlava3.gif

hlava3.gif

471 ms

logo_HK_CZ_bar.gif

logo_HK_CZ_bar.gif

969 ms

LOGO%20AJS_obdelnik.png

LOGO%20AJS_obdelnik.png

654 ms

Logo_AIVD_CR.gif

Logo_AIVD_CR.gif

563 ms

AJSA_ctverec_web%20maly.gif

AJSA_ctverec_web%20maly.gif

564 ms

British%20Council_%20partner%20color.jpg

British%20Council_%20partner%20color.jpg

955 ms

msmt.gif

msmt.gif

655 ms

bi-foto.jpg

bi-foto.jpg

657 ms

bi-male.jpg

bi-male.jpg

657 ms

all.js

all.js

57 ms

bg2.gif

bg2.gif

745 ms

bgmenu.gif

bgmenu.gif

744 ms

brad-arrow.gif

brad-arrow.gif

748 ms

left-header.gif

left-header.gif

748 ms

left-header-white.gif

left-header-white.gif

838 ms

rss-sipka.png

rss-sipka.png

839 ms

dot.asp

dot.asp

20285 ms

all.js

all.js

4 ms

retargeting.js

retargeting.js

692 ms

bohemia-institut-print.css

bohemia-institut-print.css

94 ms

web.min.js

web.min.js

501 ms

ga.js

ga.js

115 ms

34 ms

__utm.gif

__utm.gif

41 ms

like_box.php

like_box.php

94 ms

30 ms

collect

collect

168 ms

r8xWWK5RS5M.css

r8xWWK5RS5M.css

26 ms

VoWuN4ih9IW.js

VoWuN4ih9IW.js

32 ms

o1ndYS2og_B.js

o1ndYS2og_B.js

27 ms

vxmlpLbAeCj.js

vxmlpLbAeCj.js

28 ms

Q-X-GXL_I_5.js

Q-X-GXL_I_5.js

30 ms

_02W6YRik00.js

_02W6YRik00.js

29 ms

qJoe20iyDr0.js

qJoe20iyDr0.js

29 ms

p55HfXW__mM.js

p55HfXW__mM.js

29 ms

302432667_579389053713295_5781338530597661219_n.jpg

302432667_579389053713295_5781338530597661219_n.jpg

33 ms

301394245_579389050379962_1576891805043722780_n.jpg

301394245_579389050379962_1576891805043722780_n.jpg

12 ms

UXtr_j2Fwe-.png

UXtr_j2Fwe-.png

7 ms

ga-audiences

ga-audiences

64 ms

cs

cs

138 ms

global.css

global.css

116 ms

client-embed.min.js

client-embed.min.js

231 ms

client-embed-cs.min.js

client-embed-cs.min.js

331 ms

bg_client_logo.png

bg_client_logo.png

112 ms

ilu_arw.png

ilu_arw.png

146 ms

ico_status.png

ico_status.png

110 ms

Accessibility Review

bi.cz accessibility score

82

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

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

Links do not have a discernible name

Best Practices

bi.cz best practices score

58

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

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

SEO Factors

bi.cz SEO score

62

Search Engine Optimization Advices

Crawling and Indexing

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

Impact

Issue

High

Links are not crawlable

Language and Encoding

  • Language Detected

    CS

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Bi.cz can be misinterpreted by Google and other search engines. Our service has detected that Czech is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Bi.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

bi.cz

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