Tools & Wizards About Us
images.o2.cz screenshot

Report Summary

  • 26

    Performance

    Renders faster than
    45% 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

images.o2.cz

O2 | Volání, internet, televize a balíčky O2 Spolu

Page Load Speed

12.2 sec in total

First Response

397 ms

Resources Loaded

9.6 sec

Page Rendered

2.1 sec

images.o2.cz screenshot

About Website

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

O2 nabízí výhodné volání, široké pokrytí i rychlost internetu a další telekomunikační služby. Jejich kombinací i nákupem on-line ušetříte, spojte si služby v O2 Spolu. Zařiďte vše v aplikaci Moje O2.

Visit images.o2.cz

Key Findings

We analyzed Images.o2.cz page load time and found that the first response time was 397 ms and then it took 11.8 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

images.o2.cz performance score

26

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.6 s

14/100

10%

LCP (Largest Contentful Paint)

Value12.1 s

0/100

25%

SI (Speed Index)

Value10.4 s

8/100

10%

TBT (Total Blocking Time)

Value990 ms

28/100

30%

CLS (Cumulative Layout Shift)

Value0.012

100/100

15%

TTI (Time to Interactive)

Value21.2 s

1/100

10%

Network Requests Diagram

images.o2.cz

397 ms

404 ms

osobni

817 ms

index.scss

813 ms

-a220821

292 ms

Our browser made a total of 119 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Images.o2.cz, 84% (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 (3.6 sec) relates to the external source O2.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 652.9 kB (42%)

Content Size

1.6 MB

After Optimization

920.4 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Images.o2.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. 45% 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, Images O2 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 190.0 kB

  • Original 443.5 kB
  • After minification 443.4 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 190.0 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. Images.o2.cz has all CSS files already compressed.

Requests Breakdown

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

Requests Now

106

After Optimization

89

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 106 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Images 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 18 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

images.o2.cz

images.o2.cz

397 ms

404 ms

osobni

osobni

817 ms

index.scss

index.scss

813 ms

-a220821

-a220821

292 ms

index.js

index.js

116 ms

launch-EN01534af7e30646e8b078ac64dc75500b.min.js

launch-EN01534af7e30646e8b078ac64dc75500b.min.js

17 ms

-a74517

-a74517

609 ms

-a74537.js

-a74537.js

932 ms

cmp.php

cmp.php

1053 ms

cmp_final.min.js

cmp_final.min.js

1206 ms

exponea.min.js

exponea.min.js

329 ms

AppMeasurement.min.js

AppMeasurement.min.js

95 ms

AppMeasurement_Module_ActivityMap.min.js

AppMeasurement_Module_ActivityMap.min.js

94 ms

-a104299

-a104299

836 ms

-a104458

-a104458

771 ms

-a104449

-a104449

709 ms

-a104457

-a104457

871 ms

-a104456

-a104456

953 ms

-a163542

-a163542

651 ms

-a163549

-a163549

924 ms

-a163554

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999 ms

-a163564

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1057 ms

-a195405

-a195405

1222 ms

-a214683

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1245 ms

-a214685

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1307 ms

-a212625

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1243 ms

-a212541

-a212541

1302 ms

-a212915

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1349 ms

-a212955

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1512 ms

-a212589

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1536 ms

-a212901

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1543 ms

-a212879

-a212879

1594 ms

-a212881

-a212881

1599 ms

-a167366

-a167366

1749 ms

-a212399

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1894 ms

-a167369

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1942 ms

-a213187

-a213187

1894 ms

-a212857

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1975 ms

-a212595

-a212595

1950 ms

-a212797

-a212797

2047 ms

-a212331

-a212331

2139 ms

-a212837

-a212837

2139 ms

-a212469

-a212469

2233 ms

-a212303

-a212303

2242 ms

-a212871

-a212871

2268 ms

-a212911

-a212911

2337 ms

gtm.js

gtm.js

197 ms

-a212383

-a212383

2415 ms

-a212905

-a212905

2416 ms

actions.js

actions.js

489 ms

persoo.js

persoo.js

576 ms

persoo-ui.js

persoo-ui.js

575 ms

-a74400

-a74400

2466 ms

s0628277170471

s0628277170471

8 ms

workflow.js

workflow.js

112 ms

-a74418

-a74418

2136 ms

-a74425

-a74425

2199 ms

persooAutocomplete.js

persooAutocomplete.js

87 ms

-a74404

-a74404

2159 ms

-e8893

-e8893

2091 ms

-a74406

-a74406

2057 ms

-a74419

-a74419

2370 ms

ncas-init.js

ncas-init.js

2170 ms

-a74412

-a74412

2354 ms

bV8xLndfMzQ1MjAucl9HRFBSLmxfY3Mudi5wLnRfMTY3ODgueHRfMjUy.js

bV8xLndfMzQ1MjAucl9HRFBSLmxfY3Mudi5wLnRfMTY3ODgueHRfMjUy.js

246 ms

-a74423

-a74423

2344 ms

OnAir-Bold.woff

OnAir-Bold.woff

2180 ms

-a104236

-a104236

1997 ms

-a212953

-a212953

2176 ms

-a167383

-a167383

2443 ms

-a104417

-a104417

2276 ms

-a104424

-a104424

2921 ms

-a107907

-a107907

2164 ms

-a107978

-a107978

2144 ms

box-bg.jpg

box-bg.jpg

2257 ms

box-1-object-mobile.png

box-1-object-mobile.png

2559 ms

box-2-object-mobile.png

box-2-object-mobile.png

2737 ms

box-3-object-mobile.png

box-3-object-mobile.png

2593 ms

135 ms

203 ms

box-4-bg.jpg

box-4-bg.jpg

2235 ms

box-4-object-mobile.png

box-4-object-mobile.png

2456 ms

-a104434

-a104434

2476 ms

-a104440

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2770 ms

-a104446

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2772 ms

-a164483

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3615 ms

-a104447

-a104447

3060 ms

-e20702

-e20702

2518 ms

osobni

osobni

2125 ms

-a104299

-a104299

668 ms

-a104458

-a104458

480 ms

-a104449

-a104449

387 ms

-a104457

-a104457

481 ms

-a195405

-a195405

295 ms

-a212625

-a212625

582 ms

-a212541

-a212541

677 ms

-a212915

-a212915

690 ms

-a212955

-a212955

769 ms

-a212589

-a212589

771 ms

-a212901

-a212901

871 ms

-a212879

-a212879

957 ms

-a212881

-a212881

966 ms

-a212399

-a212399

979 ms

-a213187

-a213187

1060 ms

-a212857

-a212857

1064 ms

-a212595

-a212595

1162 ms

-a212797

-a212797

1246 ms

-a212331

-a212331

1254 ms

-a212837

-a212837

1268 ms

-a212469

-a212469

1348 ms

-a212303

-a212303

1353 ms

-a212871

-a212871

1452 ms

-a212911

-a212911

1535 ms

-a212383

-a212383

1540 ms

-a212905

-a212905

1557 ms

-a212953

-a212953

1642 ms

-a104446

-a104446

1738 ms

workflow.js

workflow.js

94 ms

Accessibility Review

images.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

images.o2.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

images.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 Images.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 Images.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

images.o2.cz

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