Tools & Wizards About Us
vaillant.cz screenshot

Report Summary

  • 37

    Performance

    Renders faster than
    56% of other websites

  • 91

    Accessibility

    Visual factors better than
    that of 76% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

vaillant.cz

Komfort pro váš domov | Vaillant

Page Load Speed

7.8 sec in total

First Response

2.5 sec

Resources Loaded

4.7 sec

Page Rendered

600 ms

vaillant.cz screenshot

About Website

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

Řešení vytápění na míru vašim potřebám: ✔ Více než 140 let zkušeností ✔ Německý vývoj → Objevte naše výrobky!

Visit vaillant.cz

Key Findings

We analyzed Vaillant.cz page load time and found that the first response time was 2.5 sec and then it took 5.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

vaillant.cz performance score

37

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.8 s

28/100

10%

LCP (Largest Contentful Paint)

Value5.7 s

17/100

25%

SI (Speed Index)

Value8.0 s

22/100

10%

TBT (Total Blocking Time)

Value730 ms

40/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value15.3 s

7/100

10%

Network Requests Diagram

www.vaillant.cz

2462 ms

eb16754db774.js

61 ms

script.min.js

1659 ms

style.min.css

554 ms

gtm.js

94 ms

Our browser made a total of 37 requests to load all elements on the main page. We found that 89% of them (33 requests) were addressed to the original Vaillant.cz, 8% (3 requests) were made to Googletagmanager.com and 3% (1 request) were made to Cdn.consentmanager.net. The less responsive or slowest element that took the longest time to load (2.5 sec) belongs to the original domain Vaillant.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 428.4 kB (15%)

Content Size

2.9 MB

After Optimization

2.5 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Vaillant.cz main page is 2.9 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. Javascripts take 1.2 MB which makes up the majority of the site volume.

HTML Optimization

-75%

Potential reduce by 399.1 kB

  • Original 530.1 kB
  • After minification 529.7 kB
  • After compression 131.0 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 399.1 kB or 75% of the original size.

Image Optimization

-3%

Potential reduce by 28.7 kB

  • Original 1.1 MB
  • After minification 1.1 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. Vaillant images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 0 B

  • Original 1.2 MB
  • After minification 1.2 MB
  • After compression 1.2 MB

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

-1%

Potential reduce by 630 B

  • Original 64.5 kB
  • After minification 64.5 kB
  • After compression 63.9 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. Vaillant.cz has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 4 (13%)

Requests Now

32

After Optimization

28

  • Images
  • JavaScript
  • CSS

The browser has sent 32 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Vaillant. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

www.vaillant.cz

www.vaillant.cz

2462 ms

eb16754db774.js

eb16754db774.js

61 ms

script.min.js

script.min.js

1659 ms

style.min.css

style.min.css

554 ms

gtm.js

gtm.js

94 ms

logo-header-mobile.svg

logo-header-mobile.svg

191 ms

vaillant-logo-272x72-1888261_1.png

vaillant-logo-272x72-1888261_1.png

406 ms

HP23-312684_01_image_640w_274h.webp

HP23-312684_01_image_640w_274h.webp

407 ms

HP21-311037_01_image_640w_274h.webp

HP21-311037_01_image_640w_274h.webp

551 ms

Professionals20-409310_01.eps_image_640w_274h.jpg

Professionals20-409310_01.eps_image_640w_274h.jpg

749 ms

PEOPLE18-45513_02.eps_image_640w_274h.jpg

PEOPLE18-45513_02.eps_image_640w_274h.jpg

760 ms

231214-vaillant-150-teaser-module-eng_image_640w_274h.jpg

231214-vaillant-150-teaser-module-eng_image_640w_274h.jpg

692 ms

google_chrome.svg

google_chrome.svg

619 ms

microsoft_edge.svg

microsoft_edge.svg

592 ms

mozilla_firefox.svg

mozilla_firefox.svg

820 ms

Vaillant16-Book.woff

Vaillant16-Book.woff

928 ms

Vaillant16-Light.woff

Vaillant16-Light.woff

912 ms

Vaillant16-Demi.woff

Vaillant16-Demi.woff

1035 ms

Vaillant16-Heavy.woff

Vaillant16-Heavy.woff

1021 ms

blur-background.jpg

blur-background.jpg

839 ms

az-5-let-zaruka.jpg

az-5-let-zaruka.jpg

1204 ms

az-5-let-zaruka_image_640w_360h.jpg

az-5-let-zaruka_image_640w_360h.jpg

839 ms

whbc19-308901-02_image_640w_427h.jpg

whbc19-308901-02_image_640w_427h.jpg

959 ms

hp18-35186-02_image_640w_427h.jpg

hp18-35186-02_image_640w_427h.jpg

1716 ms

vaillant-service_image_640w_427h.webp

vaillant-service_image_640w_427h.webp

945 ms

HP19_309251_01_1_image_640w_360h.jpg

HP19_309251_01_1_image_640w_360h.jpg

1221 ms

HP23-912509_01.png_image_640w_480h.png

HP23-912509_01.png_image_640w_480h.png

1027 ms

people18-45591-02-neu_image_640w_640h.webp

people18-45591-02-neu_image_640w_640h.webp

1248 ms

videoassist_image_640w_640h.jpg

videoassist_image_640w_640h.jpg

1119 ms

150years-teaser-image_image_640w_640h.jpg

150years-teaser-image_image_640w_640h.jpg

1256 ms

radiator_image_640w_640h.webp

radiator_image_640w_640h.webp

1445 ms

GettyImages-1308582999_image_640w_640h.jpg

GettyImages-1308582999_image_640w_640h.jpg

1841 ms

control21-308830-02_image_640w_640h.jpg

control21-308830-02_image_640w_640h.jpg

1412 ms

hp19-108944-02_image_640w_640h-2.jpg

hp19-108944-02_image_640w_640h-2.jpg

1441 ms

VAI-Logo-SCREEN_Inverted.svg

VAI-Logo-SCREEN_Inverted.svg

1523 ms

js

js

113 ms

js

js

45 ms

Accessibility Review

vaillant.cz accessibility score

91

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

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

vaillant.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

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

SEO Factors

vaillant.cz SEO score

92

Search Engine Optimization Advices

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 Vaillant.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 Vaillant.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

vaillant.cz

Open Graph description is not detected on the main page of Vaillant. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: