Tools & Wizards About Us
m.o2.cz screenshot

Report Summary

  • 23

    Performance

    Renders faster than
    42% of other websites

  • 90

    Accessibility

    Visual factors better than
    that of 74% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

m.o2.cz

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

Page Load Speed

15.7 sec in total

First Response

583 ms

Resources Loaded

12.3 sec

Page Rendered

2.9 sec

m.o2.cz screenshot

About Website

Click here to check amazing M O2 content for Czech Republic. Otherwise, check out these important facts you probably never knew about m.o2.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 m.o2.cz

Key Findings

We analyzed M.o2.cz page load time and found that the first response time was 583 ms and then it took 15.2 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

m.o2.cz performance score

23

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.3 s

17/100

10%

LCP (Largest Contentful Paint)

Value12.8 s

0/100

25%

SI (Speed Index)

Value11.1 s

6/100

10%

TBT (Total Blocking Time)

Value1,270 ms

19/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value23.6 s

1/100

10%

Network Requests Diagram

m.o2.cz

583 ms

www.o2.cz

398 ms

osobni

817 ms

index.scss

875 ms

-a220821

292 ms

Our browser made a total of 171 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original M.o2.cz, 87% (149 requests) were made to O2.cz and 5% (8 requests) were made to S.o2.cz. The less responsive or slowest element that took the longest time to load (3 sec) relates to the external source O2.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 638.3 kB (52%)

Content Size

1.2 MB

After Optimization

599.7 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of M.o2.cz main page is 1.2 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. 55% of websites need less resources to load. Images take 449.6 kB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 208.9 kB

  • Original 264.6 kB
  • After minification 256.6 kB
  • After compression 55.7 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 208.9 kB or 79% of the original size.

Image Optimization

-53%

Potential reduce by 240.0 kB

  • Original 449.6 kB
  • After minification 209.6 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, M O2 needs image optimization as it can save up to 240.0 kB or 53% 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 188.7 kB

  • Original 442.5 kB
  • After minification 442.4 kB
  • After compression 253.8 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 188.7 kB or 43% of the original size.

CSS Optimization

-1%

Potential reduce by 647 B

  • Original 81.3 kB
  • After minification 81.3 kB
  • After compression 80.6 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. M.o2.cz has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 19 (12%)

Requests Now

162

After Optimization

143

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 162 CSS, Javascripts, AJAX and image requests in order to completely render the main page of M O2. 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 as a result speed up the page load time.

Network Requests Diagram

m.o2.cz

m.o2.cz

583 ms

www.o2.cz

www.o2.cz

398 ms

osobni

osobni

817 ms

index.scss

index.scss

875 ms

-a220821

-a220821

292 ms

index.js

index.js

22 ms

launch-EN01534af7e30646e8b078ac64dc75500b.min.js

launch-EN01534af7e30646e8b078ac64dc75500b.min.js

22 ms

-a74517

-a74517

577 ms

-a74537.js

-a74537.js

1043 ms

cmp.php

cmp.php

716 ms

cmp_final.min.js

cmp_final.min.js

1108 ms

exponea.min.js

exponea.min.js

456 ms

AppMeasurement.min.js

AppMeasurement.min.js

122 ms

AppMeasurement_Module_ActivityMap.min.js

AppMeasurement_Module_ActivityMap.min.js

122 ms

-a104299

-a104299

791 ms

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524 ms

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826 ms

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806 ms

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731 ms

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875 ms

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1021 ms

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1067 ms

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1781 ms

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1782 ms

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1984 ms

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1987 ms

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2076 ms

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2072 ms

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2072 ms

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2075 ms

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2273 ms

-a153301

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2278 ms

-e20775

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2365 ms

-e20784

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2366 ms

gtm.js

gtm.js

227 ms

-e20753

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2351 ms

actions.js

actions.js

529 ms

persoo.js

persoo.js

628 ms

persoo-ui.js

persoo-ui.js

537 ms

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-a74400

2252 ms

s39245252050459

s39245252050459

7 ms

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2322 ms

LBX-43775.js

LBX-43775.js

190 ms

bV8xLndfMzQ1MjAucl9HRFBSLmxfY3Mudi5wLnRfMTY3ODgueHRfODM.js

bV8xLndfMzQ1MjAucl9HRFBSLmxfY3Mudi5wLnRfMTY3ODgueHRfODM.js

381 ms

workflow.js

workflow.js

164 ms

-a74425

-a74425

2103 ms

-a74404

-a74404

2159 ms

o2-cz.js

o2-cz.js

390 ms

-e8893

-e8893

2145 ms

OnAir-Bold.woff

OnAir-Bold.woff

2106 ms

-e20790

-e20790

2073 ms

persooAutocomplete.js

persooAutocomplete.js

107 ms

ncas-init.js

ncas-init.js

2226 ms

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2116 ms

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2105 ms

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2056 ms

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2039 ms

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2038 ms

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2023 ms

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2062 ms

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2066 ms

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2062 ms

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2038 ms

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2035 ms

148 ms

248 ms

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2024 ms

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2067 ms

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2025 ms

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2025 ms

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2114 ms

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2020 ms

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2024 ms

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2067 ms

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2024 ms

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2026 ms

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2021 ms

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2863 ms

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2025 ms

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2064 ms

box-bg.webp

box-bg.webp

2110 ms

box-1-object-mobile.webp

box-1-object-mobile.webp

2301 ms

box-2-object-mobile.webp

box-2-object-mobile.webp

2201 ms

box-3-object-mobile.webp

box-3-object-mobile.webp

2107 ms

box-4-bg.webp

box-4-bg.webp

1865 ms

box-4-object-mobile.webp

box-4-object-mobile.webp

2037 ms

-a104434

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2008 ms

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2195 ms

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2162 ms

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3007 ms

osobni

osobni

2527 ms

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2429 ms

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2022 ms

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384 ms

-a104458

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389 ms

-a104449

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577 ms

-a104457

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671 ms

-a104456

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491 ms

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789 ms

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862 ms

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866 ms

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774 ms

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869 ms

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965 ms

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1063 ms

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1078 ms

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1155 ms

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1157 ms

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1158 ms

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1253 ms

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1354 ms

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1367 ms

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1444 ms

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1448 ms

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1450 ms

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1544 ms

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1643 ms

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1655 ms

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1733 ms

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1738 ms

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1737 ms

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1835 ms

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1934 ms

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1944 ms

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2021 ms

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2024 ms

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2027 ms

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2122 ms

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1918 ms

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1857 ms

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1932 ms

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1829 ms

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1748 ms

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1752 ms

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1748 ms

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1742 ms

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1748 ms

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1743 ms

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1743 ms

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1749 ms

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1749 ms

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1744 ms

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1749 ms

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1738 ms

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1739 ms

-e28569

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1753 ms

-e20813

-e20813

1748 ms

-e20816

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1745 ms

box-bg.webp

box-bg.webp

1848 ms

box-1-object-mobile.webp

box-1-object-mobile.webp

1930 ms

box-2-object-mobile.webp

box-2-object-mobile.webp

1929 ms

box-3-object-mobile.webp

box-3-object-mobile.webp

1843 ms

box-4-bg.webp

box-4-bg.webp

1839 ms

box-4-object-mobile.webp

box-4-object-mobile.webp

1877 ms

-a104446

-a104446

1947 ms

workflow.js

workflow.js

144 ms

RC304d1437ce8b4a6abf22884e95aaa7c6-source.min.js

RC304d1437ce8b4a6abf22884e95aaa7c6-source.min.js

3 ms

Accessibility Review

m.o2.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

m.o2.cz best practices score

83

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

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

m.o2.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 M.o2.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 M.o2.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

m.o2.cz

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