Tools & Wizards About Us
arara.cz screenshot

Report Summary

  • 15

    Performance

    Renders faster than
    27% of other websites

  • 87

    Accessibility

    Visual factors better than
    that of 66% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 89

    SEO

    Google-friendlier than
    66% of websites

arara.cz

Martinus.cz - Tisíce příběhů. Jedno knihkupectví. | Martinus.cz

Page Load Speed

2.4 sec in total

First Response

125 ms

Resources Loaded

1.9 sec

Page Rendered

419 ms

arara.cz screenshot

About Website

Click here to check amazing Arara content for Czech Republic. Otherwise, check out these important facts you probably never knew about arara.cz

Milujeme knihy stejně jako vy. Máme 324 891 titulů, skvělý zákaznický servis, doručení od 29 Kč, knihomolské soutěže a projekty.

Visit arara.cz

Key Findings

We analyzed Arara.cz page load time and found that the first response time was 125 ms and then it took 2.3 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.

Performance Metrics

arara.cz performance score

15

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.8 s

12/100

10%

LCP (Largest Contentful Paint)

Value9.4 s

0/100

25%

SI (Speed Index)

Value10.5 s

7/100

10%

TBT (Total Blocking Time)

Value3,570 ms

1/100

30%

CLS (Cumulative Layout Shift)

Value0.116

85/100

15%

TTI (Time to Interactive)

Value20.8 s

2/100

10%

Network Requests Diagram

arara.cz

125 ms

www.martinus.cz

886 ms

martinus.async.js

53 ms

uc.js

24 ms

style.css

60 ms

Our browser made a total of 34 requests to load all elements on the main page. We found that 3% of them (1 request) were addressed to the original Arara.cz, 41% (14 requests) were made to Mrtns.sk and 18% (6 requests) were made to Rs4.martinus.sk. The less responsive or slowest element that took the longest time to load (886 ms) relates to the external source Martinus.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 223.3 kB (27%)

Content Size

830.8 kB

After Optimization

607.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Arara.cz main page is 830.8 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. 50% of websites need less resources to load. Images take 325.5 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 130.1 kB

  • Original 162.2 kB
  • After minification 145.6 kB
  • After compression 32.1 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 130.1 kB or 80% of the original size.

Image Optimization

-2%

Potential reduce by 5.2 kB

  • Original 325.5 kB
  • After minification 320.3 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. Arara images are well optimized though.

JavaScript Optimization

-29%

Potential reduce by 88.0 kB

  • Original 304.6 kB
  • After minification 304.6 kB
  • After compression 216.7 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 88.0 kB or 29% of the original size.

CSS Optimization

-0%

Potential reduce by 12 B

  • Original 38.4 kB
  • After minification 38.4 kB
  • After compression 38.4 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. Arara.cz has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 18 (56%)

Requests Now

32

After Optimization

14

  • Images
  • JavaScript
  • CSS

The browser has sent 32 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Arara. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

arara.cz

arara.cz

125 ms

www.martinus.cz

www.martinus.cz

886 ms

martinus.async.js

martinus.async.js

53 ms

uc.js

uc.js

24 ms

style.css

style.css

60 ms

modernizr.js

modernizr.js

86 ms

vendor.js

vendor.js

88 ms

main.js

main.js

98 ms

font-awesome.js

font-awesome.js

100 ms

autocomplete.js

autocomplete.js

24 ms

martinus_cz.production.js

martinus_cz.production.js

114 ms

martinus.js

martinus.js

92 ms

martinus.hotwire.js

martinus.hotwire.js

112 ms

trackjs.php

trackjs.php

599 ms

j.php

j.php

809 ms

lg.php

lg.php

516 ms

f9203d63af66cebcbab3d22da74d2baa.png

f9203d63af66cebcbab3d22da74d2baa.png

84 ms

app.svg

app.svg

94 ms

df35927e8d4337d509542e8b5951630e.jpg

df35927e8d4337d509542e8b5951630e.jpg

72 ms

aa5667e02339251e76a1becd9a7b0292.jpg

aa5667e02339251e76a1becd9a7b0292.jpg

493 ms

b740895f1555a948800ca681e1eb5853.jpg

b740895f1555a948800ca681e1eb5853.jpg

85 ms

5b033c22c8bf6b4e60c2c07d4a9b3ac4.jpg

5b033c22c8bf6b4e60c2c07d4a9b3ac4.jpg

488 ms

pix.gif

pix.gif

438 ms

logo.svg

logo.svg

94 ms

logo-small.svg

logo-small.svg

45 ms

m230308.jpg

m230308.jpg

237 ms

heart-rainbow.svg

heart-rainbow.svg

44 ms

lg.php

lg.php

499 ms

lg.php

lg.php

501 ms

lg.php

lg.php

506 ms

lg.php

lg.php

508 ms

lg.php

lg.php

509 ms

autocomplete.css

autocomplete.css

32 ms

main.css

main.css

41 ms

Accessibility Review

arara.cz accessibility score

87

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.

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

Links do not have a discernible name

Best Practices

arara.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

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

arara.cz SEO score

89

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

High

Tap targets are not sized appropriately

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 Arara.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 Arara.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

arara.cz

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