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blackfriday.itesco.cz screenshot

Report Summary

  • 32

    Performance

    Renders faster than
    52% of other websites

  • 77

    Accessibility

    Visual factors better than
    that of 45% of websites

  • 0

    Best Practices

  • 86

    SEO

    Google-friendlier than
    60% of websites

blackfriday.itesco.cz

Tesco Supermarkety | Clubcard, Letáky & Recepty | Tesco

Page Load Speed

6 sec in total

First Response

368 ms

Resources Loaded

5.5 sec

Page Rendered

93 ms

blackfriday.itesco.cz screenshot

About Website

Click here to check amazing Blackfriday I Tesco content for Czech Republic. Otherwise, check out these important facts you probably never knew about blackfriday.itesco.cz

Prolistujte si aktuální letáky Tesco, získejte skvělé slevy s Clubcard, objevte chutné recepty anebo vyřiďte svůj nákup online hned teď. Těšíme se na vás!

Visit blackfriday.itesco.cz

Key Findings

We analyzed Blackfriday.itesco.cz page load time and found that the first response time was 368 ms and then it took 5.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

blackfriday.itesco.cz performance score

32

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.3 s

3/100

10%

LCP (Largest Contentful Paint)

Value12.4 s

0/100

25%

SI (Speed Index)

Value6.8 s

34/100

10%

TBT (Total Blocking Time)

Value710 ms

42/100

30%

CLS (Cumulative Layout Shift)

Value0.068

96/100

15%

TTI (Time to Interactive)

Value13.7 s

10/100

10%

Network Requests Diagram

blackfriday.itesco.cz

368 ms

jquery-2.1.1.min.js

1149 ms

jquery-ui-1.10.4.min.js

1644 ms

jquery.cookie.js

930 ms

crossDomainIframeSet.js

1095 ms

Our browser made a total of 19 requests to load all elements on the main page. We found that all of those requests were addressed to Blackfriday.itesco.cz and no external sources were called. The less responsive or slowest element that took the longest time to load (2.8 sec) belongs to the original domain Blackfriday.itesco.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 341.8 kB (73%)

Content Size

469.4 kB

After Optimization

127.7 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Blackfriday.itesco.cz main page is 469.4 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. 20% of websites need less resources to load. Javascripts take 343.5 kB which makes up the majority of the site volume.

HTML Optimization

-74%

Potential reduce by 3.4 kB

  • Original 4.6 kB
  • After minification 4.0 kB
  • After compression 1.2 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. This page needs HTML code to be minified as it can gain 527 B, which is 12% 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 3.4 kB or 74% of the original size.

Image Optimization

-73%

Potential reduce by 54.9 kB

  • Original 75.3 kB
  • After minification 20.5 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. Obviously, Blackfriday I Tesco needs image optimization as it can save up to 54.9 kB or 73% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-71%

Potential reduce by 244.6 kB

  • Original 343.5 kB
  • After minification 338.6 kB
  • After compression 99.0 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 244.6 kB or 71% of the original size.

CSS Optimization

-85%

Potential reduce by 39.0 kB

  • Original 46.0 kB
  • After minification 35.6 kB
  • After compression 7.0 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. Blackfriday.itesco.cz needs all CSS files to be minified and compressed as it can save up to 39.0 kB or 85% of the original size.

Requests Breakdown

Number of requests can be reduced by 10 (67%)

Requests Now

15

After Optimization

5

  • Images
  • JavaScript
  • CSS

The browser has sent 15 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Blackfriday I Tesco. 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 from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

blackfriday.itesco.cz

blackfriday.itesco.cz

368 ms

jquery-2.1.1.min.js

jquery-2.1.1.min.js

1149 ms

jquery-ui-1.10.4.min.js

jquery-ui-1.10.4.min.js

1644 ms

jquery.cookie.js

jquery.cookie.js

930 ms

crossDomainIframeSet.js

crossDomainIframeSet.js

1095 ms

general.js

general.js

1106 ms

pagewidth.js

pagewidth.js

1110 ms

kcs.index.js

kcs.index.js

1771 ms

kcs.index.css

kcs.index.css

2659 ms

fonts.css

fonts.css

2663 ms

general.css

general.css

2661 ms

subpage.css

subpage.css

2682 ms

rollout.css

rollout.css

2687 ms

tesco-logo.png

tesco-logo.png

976 ms

bf-logo-rollout.png

bf-logo-rollout.png

2809 ms

bw-bg.png

bw-bg.png

1687 ms

tescom-black-webfont.woff

tescom-black-webfont.woff

2343 ms

tescomregular-webfont.woff

tescomregular-webfont.woff

2472 ms

tescom-bold-webfont.woff

tescom-bold-webfont.woff

2278 ms

Accessibility Review

blackfriday.itesco.cz accessibility score

77

Accessibility Issues

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-*] attributes do not match their roles

High

[aria-hidden="true"] elements contain focusable descendents

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

[id] attributes on active, focusable elements are not unique

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

High

Links do not have a discernible name

SEO Factors

blackfriday.itesco.cz SEO score

86

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

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

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 Blackfriday.itesco.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 Blackfriday.itesco.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

blackfriday.itesco.cz

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