Tools & Wizards About Us
o2-tv.cz screenshot

Report Summary

  • 28

    Performance

    Renders faster than
    48% of other websites

  • 90

    Accessibility

    Visual factors better than
    that of 74% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

o2-tv.cz

O2 | Mobilní tarif, internet, televize a balíčky O2 Spolu

Page Load Speed

12 sec in total

First Response

388 ms

Resources Loaded

9.5 sec

Page Rendered

2.1 sec

o2-tv.cz screenshot

About Website

Visit o2-tv.cz now to see the best up-to-date O2 Tv content and also check out these interesting facts you probably never knew about o2-tv.cz

Dopřejte si to nejlepší: neomezený tarif i volání, rychlý internet, Oneplay nebo výhodný balíček služeb O2 Spolu. Vše online i aplikaci Moje O2.

Visit o2-tv.cz

Key Findings

We analyzed O2-tv.cz page load time and found that the first response time was 388 ms and then it took 11.6 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

o2-tv.cz performance score

28

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.6 s

32/100

10%

LCP (Largest Contentful Paint)

Value11.0 s

0/100

25%

SI (Speed Index)

Value9.1 s

14/100

10%

TBT (Total Blocking Time)

Value1,030 ms

26/100

30%

CLS (Cumulative Layout Shift)

Value0.02

100/100

15%

TTI (Time to Interactive)

Value21.0 s

1/100

10%

Network Requests Diagram

o2-tv.cz

388 ms

www.o2.cz

496 ms

osobni

820 ms

index.scss

877 ms

-a220821

296 ms

Our browser made a total of 118 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original O2-tv.cz, 85% (100 requests) were made to O2.cz and 5% (6 requests) were made to S.o2.cz. The less responsive or slowest element that took the longest time to load (3.5 sec) relates to the external source O2.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 651.2 kB (41%)

Content Size

1.6 MB

After Optimization

920.4 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of O2-tv.cz main page is 1.6 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. 40% of websites need less resources to load. Images take 791.2 kB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 205.1 kB

  • Original 259.9 kB
  • After minification 250.9 kB
  • After compression 54.8 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 205.1 kB or 79% of the original size.

Image Optimization

-33%

Potential reduce by 257.2 kB

  • Original 791.2 kB
  • After minification 534.0 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, O2 Tv needs image optimization as it can save up to 257.2 kB or 33% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-43%

Potential reduce by 188.3 kB

  • Original 441.8 kB
  • After minification 441.8 kB
  • After compression 253.5 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 188.3 kB or 43% of the original size.

CSS Optimization

-1%

Potential reduce by 604 B

  • Original 78.7 kB
  • After minification 78.7 kB
  • After compression 78.1 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. O2-tv.cz has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 17 (16%)

Requests Now

105

After Optimization

88

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 105 CSS, Javascripts, AJAX and image requests in order to completely render the main page of O2 Tv. 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 as a result speed up the page load time.

Network Requests Diagram

o2-tv.cz

o2-tv.cz

388 ms

www.o2.cz

www.o2.cz

496 ms

osobni

osobni

820 ms

index.scss

index.scss

877 ms

-a220821

-a220821

296 ms

index.js

index.js

89 ms

launch-EN01534af7e30646e8b078ac64dc75500b.min.js

launch-EN01534af7e30646e8b078ac64dc75500b.min.js

14 ms

-a74517

-a74517

579 ms

-a74537.js

-a74537.js

922 ms

cmp.php

cmp.php

905 ms

cmp_final.min.js

cmp_final.min.js

979 ms

exponea.min.js

exponea.min.js

285 ms

AppMeasurement.min.js

AppMeasurement.min.js

153 ms

AppMeasurement_Module_ActivityMap.min.js

AppMeasurement_Module_ActivityMap.min.js

154 ms

-a104299

-a104299

736 ms

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736 ms

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645 ms

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833 ms

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1023 ms

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566 ms

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871 ms

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937 ms

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1002 ms

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1120 ms

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1630 ms

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1734 ms

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1922 ms

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1832 ms

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1928 ms

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1874 ms

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2018 ms

-a212331

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2025 ms

-a212837

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2122 ms

-a212469

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2163 ms

-a212303

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2212 ms

-a212871

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2217 ms

-a212911

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2306 ms

-a212383

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2320 ms

gtm.js

gtm.js

187 ms

-a212905

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2402 ms

actions.js

actions.js

486 ms

persoo.js

persoo.js

652 ms

persoo-ui.js

persoo-ui.js

575 ms

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2372 ms

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2237 ms

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2159 ms

workflow.js

workflow.js

113 ms

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2052 ms

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-e8893

2041 ms

ncas-init.js

ncas-init.js

1913 ms

persooAutocomplete.js

persooAutocomplete.js

161 ms

-a74406

-a74406

2285 ms

bV8xLndfMzQ1MjAucl9HRFBSLmxfY3Mudi5wLnRfMTY3ODgueHRfMjUy.js

bV8xLndfMzQ1MjAucl9HRFBSLmxfY3Mudi5wLnRfMTY3ODgueHRfMjUy.js

167 ms

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2284 ms

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2358 ms

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2255 ms

OnAir-Bold.woff

OnAir-Bold.woff

2264 ms

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1924 ms

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2236 ms

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2394 ms

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2192 ms

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3076 ms

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2244 ms

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2149 ms

box-bg.jpg

box-bg.jpg

2334 ms

box-1-object-mobile.png

box-1-object-mobile.png

2555 ms

129 ms

239 ms

box-2-object-mobile.png

box-2-object-mobile.png

2751 ms

box-3-object-mobile.png

box-3-object-mobile.png

2589 ms

box-4-bg.jpg

box-4-bg.jpg

2302 ms

box-4-object-mobile.png

box-4-object-mobile.png

2584 ms

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2454 ms

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2702 ms

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2817 ms

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3541 ms

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3070 ms

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2574 ms

osobni

osobni

2521 ms

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671 ms

-a104458

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480 ms

-a104449

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387 ms

-a104457

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479 ms

-a195405

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294 ms

-a212625

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583 ms

-a212541

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597 ms

-a212915

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678 ms

-a212955

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773 ms

-a212589

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769 ms

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875 ms

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887 ms

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960 ms

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972 ms

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1062 ms

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1064 ms

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1165 ms

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1178 ms

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1251 ms

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1262 ms

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1355 ms

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1354 ms

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1453 ms

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1467 ms

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1541 ms

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1552 ms

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1648 ms

-a104446

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1739 ms

workflow.js

workflow.js

91 ms

Accessibility Review

o2-tv.cz accessibility score

90

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

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.

Best Practices

o2-tv.cz best practices score

75

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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

o2-tv.cz SEO score

93

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

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 O2-tv.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 O2-tv.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

o2-tv.cz

Open Graph data is detected on the main page of O2 Tv. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: