Tools & Wizards About Us
zerex.cz screenshot

Report Summary

  • 7

    Performance

    Renders faster than
    22% of other websites

  • 88

    Accessibility

    Visual factors better than
    that of 68% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

zerex.cz

Zerex -Zdraví nás sbližuje. | iZerex.cz

Page Load Speed

4.2 sec in total

First Response

362 ms

Resources Loaded

3.4 sec

Page Rendered

440 ms

zerex.cz screenshot

About Website

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

Zerex- oblíbené doplňky výživy, vitamíny a produkty pro zdraví. Zerex - Zdraví nás sbližuje.

Visit zerex.cz

Key Findings

We analyzed Zerex.cz page load time and found that the first response time was 362 ms and then it took 3.8 sec to load all DOM resources and completely render a web page. This is a poor result, as 65% of websites can load faster.

Performance Metrics

zerex.cz performance score

7

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.6 s

31/100

10%

LCP (Largest Contentful Paint)

Value22.5 s

0/100

25%

SI (Speed Index)

Value8.6 s

17/100

10%

TBT (Total Blocking Time)

Value3,650 ms

1/100

30%

CLS (Cumulative Layout Shift)

Value0.784

5/100

15%

TTI (Time to Interactive)

Value14.4 s

9/100

10%

Network Requests Diagram

zerex.cz

362 ms

izerex.cz

491 ms

libs.5f2cq.css

22 ms

libs.5f2cq.js

38 ms

all.min.css

20 ms

Our browser made a total of 112 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Zerex.cz, 86% (96 requests) were made to Izerex.cz and 4% (4 requests) were made to Cdn.luigisbox.com. The less responsive or slowest element that took the longest time to load (1.2 sec) relates to the external source Izerex.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 561.2 kB (11%)

Content Size

5.0 MB

After Optimization

4.4 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Zerex.cz main page is 5.0 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. 75% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Images take 4.4 MB which makes up the majority of the site volume.

HTML Optimization

-89%

Potential reduce by 321.1 kB

  • Original 360.3 kB
  • After minification 285.4 kB
  • After compression 39.1 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. This page needs HTML code to be minified as it can gain 74.9 kB, which is 21% 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 321.1 kB or 89% of the original size.

Image Optimization

-5%

Potential reduce by 236.5 kB

  • Original 4.4 MB
  • After minification 4.1 MB

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. Zerex images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 300 B

  • Original 188.2 kB
  • After minification 188.2 kB
  • After compression 187.9 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. This website has mostly compressed JavaScripts.

CSS Optimization

-5%

Potential reduce by 3.3 kB

  • Original 67.7 kB
  • After minification 67.7 kB
  • After compression 64.4 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. Zerex.cz has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 21 (30%)

Requests Now

70

After Optimization

49

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 70 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Zerex. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

zerex.cz

zerex.cz

362 ms

izerex.cz

izerex.cz

491 ms

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libs.5f2cq.css

22 ms

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libs.5f2cq.js

38 ms

all.min.css

all.min.css

20 ms

simple-line-icons.css

simple-line-icons.css

35 ms

custom-style.css

custom-style.css

35 ms

stripe-custom.css

stripe-custom.css

78 ms

LBX-237689.js

LBX-237689.js

436 ms

gtm.js

gtm.js

122 ms

ecmtr-2.4.2.js

ecmtr-2.4.2.js

44 ms

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phone-call.svg

236 ms

cart.svg

cart.svg

233 ms

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shipping.svg

231 ms

logo.svg

logo.svg

234 ms

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feather.min.js

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packetaWidget.js

packetaWidget.js

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email-decode.min.js

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i

i

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autocomplete.js

autocomplete.js

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autocomplete.css

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zerex.js

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search.js

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Accessibility Review

zerex.cz accessibility score

88

Accessibility Issues

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

Buttons do not have an accessible name

High

Links do not have a discernible name

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

Heading elements are not in a sequentially-descending order

Best Practices

zerex.cz best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

zerex.cz SEO score

92

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 Zerex.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 Zerex.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

zerex.cz

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