Tools & Wizards About Us
instructor.cz screenshot

Report Summary

  • 24

    Performance

    Renders faster than
    43% of other websites

  • 88

    Accessibility

    Visual factors better than
    that of 68% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 95

    SEO

    Google-friendlier than
    90% of websites

instructor.cz

Česká jednička na online školení BOZP a PO | INSTRUCTOR

Page Load Speed

4.2 sec in total

First Response

447 ms

Resources Loaded

3.4 sec

Page Rendered

371 ms

instructor.cz screenshot

About Website

Click here to check amazing INSTRUCTOR content for Czech Republic. Otherwise, check out these important facts you probably never knew about instructor.cz

Česká jednička pro online školení BOZP a PO. Platforma INSTRUCTOR se kompletně postará o vstupní i pravidelná školení vašich zaměstnanců.

Visit instructor.cz

Key Findings

We analyzed Instructor.cz page load time and found that the first response time was 447 ms and then it took 3.8 sec to load all DOM resources and completely render a web page. This is a poor result, as 65% of websites can load faster.

Performance Metrics

instructor.cz performance score

24

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.8 s

57/100

10%

LCP (Largest Contentful Paint)

Value15.4 s

0/100

25%

SI (Speed Index)

Value9.3 s

13/100

10%

TBT (Total Blocking Time)

Value2,530 ms

4/100

30%

CLS (Cumulative Layout Shift)

Value0.016

100/100

15%

TTI (Time to Interactive)

Value18.5 s

3/100

10%

Network Requests Diagram

instructor.cz

447 ms

www.instructor.cz

1018 ms

app.fe8e0149.css

225 ms

css2

41 ms

api.js

42 ms

Our browser made a total of 82 requests to load all elements on the main page. We found that 67% of them (55 requests) were addressed to the original Instructor.cz, 10% (8 requests) were made to Fonts.gstatic.com and 6% (5 requests) were made to Youtube.com. The less responsive or slowest element that took the longest time to load (1.4 sec) belongs to the original domain Instructor.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 582.3 kB (24%)

Content Size

2.4 MB

After Optimization

1.8 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Instructor.cz main page is 2.4 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 75% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 1.4 MB which makes up the majority of the site volume.

HTML Optimization

-86%

Potential reduce by 72.1 kB

  • Original 83.9 kB
  • After minification 53.1 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. This page needs HTML code to be minified as it can gain 30.8 kB, which is 37% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 72.1 kB or 86% of the original size.

Image Optimization

-13%

Potential reduce by 182.8 kB

  • Original 1.4 MB
  • After minification 1.2 MB

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, INSTRUCTOR needs image optimization as it can save up to 182.8 kB or 13% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-42%

Potential reduce by 326.2 kB

  • Original 768.9 kB
  • After minification 768.9 kB
  • After compression 442.7 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 326.2 kB or 42% of the original size.

CSS Optimization

-1%

Potential reduce by 1.3 kB

  • Original 96.9 kB
  • After minification 96.9 kB
  • After compression 95.6 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. Instructor.cz has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 15 (21%)

Requests Now

71

After Optimization

56

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 71 CSS, Javascripts, AJAX and image requests in order to completely render the main page of INSTRUCTOR. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 16 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

instructor.cz

instructor.cz

447 ms

www.instructor.cz

www.instructor.cz

1018 ms

app.fe8e0149.css

app.fe8e0149.css

225 ms

css2

css2

41 ms

api.js

api.js

42 ms

polyfill.min.js

polyfill.min.js

311 ms

runtime.cf4317a3.js

runtime.cf4317a3.js

335 ms

0.2dbd681a.js

0.2dbd681a.js

338 ms

2.d3c7f25e.js

2.d3c7f25e.js

598 ms

app.46d5551a.js

app.46d5551a.js

336 ms

gtm.js

gtm.js

150 ms

L9LRkyyssO0

L9LRkyyssO0

257 ms

5f16bee6a39d1_prevent.svg

5f16bee6a39d1_prevent.svg

246 ms

5f16bfec29811_edunio.svg

5f16bfec29811_edunio.svg

246 ms

60475b2a09d06_602e4771dad6a_verejnysektor3.svg

60475b2a09d06_602e4771dad6a_verejnysektor3.svg

248 ms

5f16c03238e50_firemni-lekar.svg

5f16c03238e50_firemni-lekar.svg

249 ms

616ed43f9ba97_medbook2.svg

616ed43f9ba97_medbook2.svg

331 ms

flag-cs.2f8b5703.svg

flag-cs.2f8b5703.svg

303 ms

flag-en.a9272560.svg

flag-en.a9272560.svg

301 ms

5ff31da2bc26f_ins-zmensene2.svg

5ff31da2bc26f_ins-zmensene2.svg

875 ms

5ff5be149aab9_ins-white-footer.svg

5ff5be149aab9_ins-white-footer.svg

791 ms

bg-01.c8204bf3.jpg

bg-01.c8204bf3.jpg

795 ms

play-button-instructor.7ff2d419.svg

play-button-instructor.7ff2d419.svg

474 ms

screen-01-symbols-instructor.39aa9fed.svg

screen-01-symbols-instructor.39aa9fed.svg

474 ms

605487f9129cc_605486c6578e1_INSTRUCTOR-hLavni_nahled_platformy.png

605487f9129cc_605486c6578e1_INSTRUCTOR-hLavni_nahled_platformy.png

865 ms

5fb6460d15c69_Group%2020.svg

5fb6460d15c69_Group%2020.svg

796 ms

5fb6462110e7f_Group%2015.svg

5fb6462110e7f_Group%2015.svg

798 ms

5fb6463cd31dc_Group%2019.svg

5fb6463cd31dc_Group%2019.svg

865 ms

5fb647e7ea8d8_Group%2057.svg

5fb647e7ea8d8_Group%2057.svg

868 ms

screen-02-symbols-instructor.21211216.svg

screen-02-symbols-instructor.21211216.svg

870 ms

5fab1c6111b0a_Dokonal%C3%BD%20p%C5%99ehled%20%C5%A1kolen%C3%AD.png

5fab1c6111b0a_Dokonal%C3%BD%20p%C5%99ehled%20%C5%A1kolen%C3%AD.png

1054 ms

5fb64800c847a_Group%2033.svg

5fb64800c847a_Group%2033.svg

871 ms

5faac1e291af5_Main_online_kurzy_prevent.png

5faac1e291af5_Main_online_kurzy_prevent.png

1449 ms

5fb6481b06eaf_Group%2017.svg

5fb6481b06eaf_Group%2017.svg

1051 ms

5fab1c7b136ad_PREVENT%20Podpora%20(1).png

5fab1c7b136ad_PREVENT%20Podpora%20(1).png

1406 ms

6022616b80b43_allianz.png

6022616b80b43_allianz.png

1052 ms

6022638e646e9_600b05ada7872_continental.png

6022638e646e9_600b05ada7872_continental.png

1052 ms

6022639ecbf88_600b05e0b2458_deloite.png

6022639ecbf88_600b05e0b2458_deloite.png

1194 ms

602263b101e05_dhl.png

602263b101e05_dhl.png

1194 ms

602263c0c4d7a_ey-logo.png

602263c0c4d7a_ey-logo.png

1192 ms

602263d193cd3_ibm-logo.png

602263d193cd3_ibm-logo.png

1193 ms

602263e2da03e_kpmg-logo.png

602263e2da03e_kpmg-logo.png

1223 ms

61f3ef4b83ee2_logo_ppf.png

61f3ef4b83ee2_logo_ppf.png

1223 ms

recaptcha__cs.js

recaptcha__cs.js

123 ms

6022640551e57_mas-logo.png

6022640551e57_mas-logo.png

1183 ms

NaPecZTIAOhVxoMyOr9n_E7fRMQ.ttf

NaPecZTIAOhVxoMyOr9n_E7fRMQ.ttf

30 ms

NaPDcZTIAOhVxoMyOr9n_E7ffGjEKIw.ttf

NaPDcZTIAOhVxoMyOr9n_E7ffGjEKIw.ttf

41 ms

NaPDcZTIAOhVxoMyOr9n_E7ffHjDKIw.ttf

NaPDcZTIAOhVxoMyOr9n_E7ffHjDKIw.ttf

67 ms

KFOlCnqEu92Fr1MmWUlvAw.ttf

KFOlCnqEu92Fr1MmWUlvAw.ttf

84 ms

KFOmCnqEu92Fr1Me5Q.ttf

KFOmCnqEu92Fr1Me5Q.ttf

83 ms

KFOlCnqEu92Fr1MmSU5vAw.ttf

KFOlCnqEu92Fr1MmSU5vAw.ttf

83 ms

6022641a8f1c4_porsche-logo.png

6022641a8f1c4_porsche-logo.png

1158 ms

602262a105342_rsdcr-logo.png

602262a105342_rsdcr-logo.png

1338 ms

60226439093d5_sap-logo.png

60226439093d5_sap-logo.png

1336 ms

www-player.css

www-player.css

61 ms

www-embed-player.js

www-embed-player.js

233 ms

base.js

base.js

384 ms

bg-03.f73253b5.jpg

bg-03.f73253b5.jpg

1203 ms

symbols-02-instructor.11ab1a73.svg

symbols-02-instructor.11ab1a73.svg

1161 ms

5fb50adf03f7b_kiwi-logo_online_skoleni_prevent.png

5fb50adf03f7b_kiwi-logo_online_skoleni_prevent.png

1200 ms

landing

landing

515 ms

js

js

218 ms

destination

destination

337 ms

cc

cc

1159 ms

5fb50c6788e81_sazka_logo_online_skoleni_prevent.jpg

5fb50c6788e81_sazka_logo_online_skoleni_prevent.jpg

1262 ms

5f2a6fea4cb78_nakit_logo_en_pos_color_300.png

5f2a6fea4cb78_nakit_logo_en_pos_color_300.png

1150 ms

605098838eae7_5fc4f78b5c32c_happyuser_edunio.jpg

605098838eae7_5fc4f78b5c32c_happyuser_edunio.jpg

1123 ms

605081df8111d_5fc4f78b5c32c_happyuser_edunio.jpg

605081df8111d_5fc4f78b5c32c_happyuser_edunio.jpg

1105 ms

symbols-01-instructor.fcf221ee.svg

symbols-01-instructor.fcf221ee.svg

1098 ms

60532bc52bb9c_Jana-klientska-Podpora-INSTRUCTOR.png

60532bc52bb9c_Jana-klientska-Podpora-INSTRUCTOR.png

1083 ms

bg-02-instructor.43591e6a.jpg

bg-02-instructor.43591e6a.jpg

1167 ms

ad_status.js

ad_status.js

291 ms

closer.8760a0b3.svg

closer.8760a0b3.svg

764 ms

thumb-instructor.c58f2f0c.svg

thumb-instructor.c58f2f0c.svg

868 ms

envelope.715c3f68.svg

envelope.715c3f68.svg

868 ms

YjCNJ0mFj9HiCkQt39lQVpZzkP0G8dlYH-ABayRLdFs.js

YjCNJ0mFj9HiCkQt39lQVpZzkP0G8dlYH-ABayRLdFs.js

115 ms

embed.js

embed.js

64 ms

KFOmCnqEu92Fr1Mu4mxP.ttf

KFOmCnqEu92Fr1Mu4mxP.ttf

32 ms

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

31 ms

id

id

116 ms

Create

Create

37 ms

GenerateIT

GenerateIT

15 ms

Accessibility Review

instructor.cz accessibility score

88

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.

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

ARIA IDs are not unique

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

instructor.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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

instructor.cz SEO score

95

Search Engine Optimization Advices

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

    CS

  • Language Claimed

    CS

  • Encoding

    UTF-8

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

instructor.cz

Open Graph data is detected on the main page of INSTRUCTOR. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: