Tools & Wizards About Us
lektorium.tv screenshot

Report Summary

  • 27

    Performance

    Renders faster than
    46% of other websites

  • 73

    Accessibility

    Visual factors better than
    that of 38% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 88

    SEO

    Google-friendlier than
    65% of websites

lektorium.tv

Лекториум | Бесплатные онлайн-курсы

Page Load Speed

12.3 sec in total

First Response

441 ms

Resources Loaded

11.2 sec

Page Rendered

674 ms

lektorium.tv screenshot

About Website

Welcome to lektorium.tv homepage info - get ready to check Lektorium best content for Russia right away, or after learning these important things about lektorium.tv

Больше 220 курсов и 6500 лекций для школьников, учителей, студентов и всех, кто хочет расширить кругозор.

Visit lektorium.tv

Key Findings

We analyzed Lektorium.tv page load time and found that the first response time was 441 ms and then it took 11.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.

Performance Metrics

lektorium.tv performance score

27

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.2 s

20/100

10%

LCP (Largest Contentful Paint)

Value9.7 s

0/100

25%

SI (Speed Index)

Value7.1 s

31/100

10%

TBT (Total Blocking Time)

Value1,220 ms

20/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value14.0 s

10/100

10%

Network Requests Diagram

lektorium.tv

441 ms

www.lektorium.tv

361 ms

www.lektorium.tv

1027 ms

system.base.css

680 ms

system.messages.css

836 ms

Our browser made a total of 53 requests to load all elements on the main page. We found that 89% of them (47 requests) were addressed to the original Lektorium.tv, 4% (2 requests) were made to Cdnjs.cloudflare.com and 4% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (6.7 sec) belongs to the original domain Lektorium.tv.

Page Optimization Overview & Recommendations

Page size can be reduced by 874.8 kB (58%)

Content Size

1.5 MB

After Optimization

639.2 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Lektorium.tv main page is 1.5 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. 30% of websites need less resources to load. CSS take 778.8 kB which makes up the majority of the site volume.

HTML Optimization

-72%

Potential reduce by 14.8 kB

  • Original 20.7 kB
  • After minification 19.0 kB
  • After compression 5.9 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 14.8 kB or 72% of the original size.

Image Optimization

-2%

Potential reduce by 9.7 kB

  • Original 488.6 kB
  • After minification 478.8 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. Lektorium images are well optimized though.

JavaScript Optimization

-66%

Potential reduce by 149.1 kB

  • Original 226.0 kB
  • After minification 187.1 kB
  • After compression 76.9 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 149.1 kB or 66% of the original size.

CSS Optimization

-90%

Potential reduce by 701.2 kB

  • Original 778.8 kB
  • After minification 544.1 kB
  • After compression 77.6 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. Lektorium.tv needs all CSS files to be minified and compressed as it can save up to 701.2 kB or 90% of the original size.

Requests Breakdown

Number of requests can be reduced by 41 (87%)

Requests Now

47

After Optimization

6

  • Images
  • JavaScript
  • CSS

The browser has sent 47 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Lektorium. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 18 to 1 for JavaScripts and from 25 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

lektorium.tv

lektorium.tv

441 ms

www.lektorium.tv

www.lektorium.tv

361 ms

www.lektorium.tv

www.lektorium.tv

1027 ms

system.base.css

system.base.css

680 ms

system.messages.css

system.messages.css

836 ms

system.theme.css

system.theme.css

973 ms

comment.css

comment.css

1115 ms

date.css

date.css

1252 ms

datepicker.1.7.css

datepicker.1.7.css

1412 ms

field.css

field.css

1423 ms

node.css

node.css

1417 ms

user.css

user.css

1408 ms

youtube.css

youtube.css

1422 ms

forum.css

forum.css

1419 ms

views.css

views.css

1541 ms

ckeditor.css

ckeditor.css

1549 ms

bootstrap.min.css

bootstrap.min.css

2032 ms

bootstrap-theme.min.css

bootstrap-theme.min.css

1717 ms

colorbox_style.css

colorbox_style.css

1558 ms

ctools.css

ctools.css

1558 ms

panels.css

panels.css

1714 ms

quote.css

quote.css

1717 ms

content_type_extras.css

content_type_extras.css

1733 ms

yandex_metrics.css

yandex_metrics.css

1731 ms

addtoany.css

addtoany.css

1897 ms

foundation.min.css

foundation.min.css

1885 ms

custom.css

custom.css

2299 ms

jquery.min.js

jquery.min.js

2342 ms

jquery.once.js

jquery.once.js

1896 ms

drupal.js

drupal.js

2058 ms

form.js

form.js

2060 ms

ru__LAUPQ8sBV1DIXZdZPEd8YZeobr3Q_sUKjGPUxNloRs.js

ru__LAUPQ8sBV1DIXZdZPEd8YZeobr3Q_sUKjGPUxNloRs.js

2060 ms

bootstrap.min.js

bootstrap.min.js

2336 ms

jquery.colorbox-min.js

jquery.colorbox-min.js

2159 ms

colorbox.js

colorbox.js

2168 ms

colorbox_style.js

colorbox_style.js

2181 ms

colorbox_load.js

colorbox_load.js

2334 ms

mathjax.js

mathjax.js

2369 ms

MathJax.js

MathJax.js

1290 ms

fotorama.css

fotorama.css

356 ms

fotorama.js

fotorama.js

506 ms

quote.js

quote.js

2366 ms

googleanalytics.js

googleanalytics.js

1786 ms

collapse.js

collapse.js

1631 ms

custom.modernizr.js

custom.modernizr.js

1506 ms

foundation.min.js

foundation.min.js

1521 ms

analytics.js

analytics.js

106 ms

collect

collect

24 ms

top.jpg

top.jpg

6746 ms

underline.png

underline.png

232 ms

partners.jpg

partners.jpg

271 ms

watch.js

watch.js

116 ms

intro.woff

intro.woff

296 ms

Accessibility Review

lektorium.tv accessibility score

73

Accessibility Issues

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

lektorium.tv best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

lektorium.tv SEO score

88

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

    RU

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Lektorium.tv can be misinterpreted by Google and other search engines. Our service has detected that Russian is used on the page, and it does not match the claimed English language. Our system also found out that Lektorium.tv 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

lektorium.tv

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