Tools & Wizards About Us
pre.cz screenshot

Report Summary

  • 47

    Performance

    Renders faster than
    65% of other websites

  • 57

    Accessibility

    Visual factors better than
    that of 24% of websites

  • 0

    Best Practices

  • 46

    SEO

    Google-friendlier than
    18% of websites

pre.cz

Domácnosti | PRE

Page Load Speed

11.6 sec in total

First Response

1.5 sec

Resources Loaded

9.3 sec

Page Rendered

839 ms

pre.cz screenshot

About Website

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

PRE je tradičním a spolehlivým dodavatelem elektrické energie na území celé České republiky.

Visit pre.cz

Key Findings

We analyzed Pre.cz page load time and found that the first response time was 1.5 sec and then it took 10.1 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

pre.cz performance score

47

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.4 s

37/100

10%

LCP (Largest Contentful Paint)

Value5.9 s

14/100

25%

SI (Speed Index)

Value3.4 s

89/100

10%

TBT (Total Blocking Time)

Value1,030 ms

26/100

30%

CLS (Cumulative Layout Shift)

Value0.003

100/100

15%

TTI (Time to Interactive)

Value4.8 s

79/100

10%

Network Requests Diagram

1508 ms

index.css

1295 ms

080a5dd09dab20009b2345dfbcfc4dfb2bc8aee5e82edca82ae3b1b728e92c337a6467520c303f12

506 ms

080a5dd09dab20009b2345dfbcfc4dfb2bc8aee5e82edca82ae3b1b728e92c337a6467520c303f12

502 ms

update-browser-component.js

600 ms

Our browser made a total of 77 requests to load all elements on the main page. We found that 90% of them (69 requests) were addressed to the original Pre.cz, 8% (6 requests) were made to Googletagmanager.com and 1% (1 request) were made to Consent.cookiebot.com. The less responsive or slowest element that took the longest time to load (4.7 sec) belongs to the original domain Pre.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.5 MB (39%)

Content Size

3.8 MB

After Optimization

2.3 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Pre.cz main page is 3.8 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. 70% of websites need less resources to load. Images take 2.3 MB which makes up the majority of the site volume.

HTML Optimization

-89%

Potential reduce by 117.4 kB

  • Original 131.7 kB
  • After minification 82.6 kB
  • After compression 14.3 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 49.1 kB, which is 37% 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 117.4 kB or 89% of the original size.

Image Optimization

-16%

Potential reduce by 367.8 kB

  • Original 2.3 MB
  • After minification 2.0 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. Obviously, PRE needs image optimization as it can save up to 367.8 kB or 16% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-68%

Potential reduce by 695.9 kB

  • Original 1.0 MB
  • After minification 1.0 MB
  • After compression 324.9 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 695.9 kB or 68% of the original size.

CSS Optimization

-86%

Potential reduce by 303.9 kB

  • Original 352.7 kB
  • After minification 348.5 kB
  • After compression 48.7 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. Pre.cz needs all CSS files to be minified and compressed as it can save up to 303.9 kB or 86% of the original size.

Requests Breakdown

Number of requests can be reduced by 24 (32%)

Requests Now

75

After Optimization

51

  • Images
  • JavaScript
  • CSS

The browser has sent 75 CSS, Javascripts, AJAX and image requests in order to completely render the main page of PRE. 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

1508 ms

index.css

index.css

1295 ms

080a5dd09dab20009b2345dfbcfc4dfb2bc8aee5e82edca82ae3b1b728e92c337a6467520c303f12

080a5dd09dab20009b2345dfbcfc4dfb2bc8aee5e82edca82ae3b1b728e92c337a6467520c303f12

506 ms

080a5dd09dab20009b2345dfbcfc4dfb2bc8aee5e82edca82ae3b1b728e92c337a6467520c303f12

080a5dd09dab20009b2345dfbcfc4dfb2bc8aee5e82edca82ae3b1b728e92c337a6467520c303f12

502 ms

update-browser-component.js

update-browser-component.js

600 ms

cookiebot.js

cookiebot.js

312 ms

index.js

index.js

1533 ms

gtm.js

gtm.js

104 ms

search.svg

search.svg

105 ms

search-close.svg

search-close.svg

103 ms

menu-search.svg

menu-search.svg

105 ms

logo_pre-color.svg

logo_pre-color.svg

106 ms

menu-burger.svg

menu-burger.svg

137 ms

menu-close.svg

menu-close.svg

199 ms

menu-arrow.svg

menu-arrow.svg

202 ms

menu-back.svg

menu-back.svg

201 ms

fotovolt_320x406.png

fotovolt_320x406.png

799 ms

Banner_Klimatizace_720x304.jpg

Banner_Klimatizace_720x304.jpg

604 ms

FVE_order_720x304px.jpg

FVE_order_720x304px.jpg

1090 ms

el_inst_w_720x304.jpg

el_inst_w_720x304.jpg

484 ms

bg-CTA-potrebuji-zaridit-320-767.jpg

bg-CTA-potrebuji-zaridit-320-767.jpg

496 ms

icon-elektrina-big-m.svg

icon-elektrina-big-m.svg

497 ms

icon-plyn-big-m.svg

icon-plyn-big-m.svg

599 ms

icon-plyn-and-elektrina-big-m.svg

icon-plyn-and-elektrina-big-m.svg

601 ms

icon-elektrina-s.svg

icon-elektrina-s.svg

695 ms

icon-plyn-s.svg

icon-plyn-s.svg

697 ms

bg-CTA-technologie-320-767.jpg

bg-CTA-technologie-320-767.jpg

999 ms

I-1-dobijeci_stanice.svg

I-1-dobijeci_stanice.svg

738 ms

icon-elektromobilita-wallbox-l.svg

icon-elektromobilita-wallbox-l.svg

794 ms

icon-elektromobilita-wallbox-m.svg

icon-elektromobilita-wallbox-m.svg

796 ms

13-dobijeci-stanice-bod.svg

13-dobijeci-stanice-bod.svg

838 ms

1-stav-uctu--white.svg

1-stav-uctu--white.svg

893 ms

I-2-0012_online_platba-L--white.svg

I-2-0012_online_platba-L--white.svg

897 ms

5-prehled-odberu-white.svg

5-prehled-odberu-white.svg

895 ms

icon-otazka-s--hover.svg

icon-otazka-s--hover.svg

936 ms

2-zalohy--white.svg

2-zalohy--white.svg

992 ms

4-kontrola-plateb--white.svg

4-kontrola-plateb--white.svg

994 ms

I-3-0056_online_sprava-L--white.svg

I-3-0056_online_sprava-L--white.svg

996 ms

image.png

image.png

1828 ms

image.jpg

image.jpg

1095 ms

image.jpg

image.jpg

4717 ms

image.jpg

image.jpg

1292 ms

image.png

image.png

1083 ms

image.jpg

image.jpg

1089 ms

image.png

image.png

1297 ms

image.jpg

image.jpg

1395 ms

cbc747ad33e6865cc26d.woff

cbc747ad33e6865cc26d.woff

1296 ms

uc.js

uc.js

43 ms

js

js

47 ms

js

js

115 ms

js

js

112 ms

destination

destination

109 ms

destination

destination

108 ms

image.png

image.png

1221 ms

image.png

image.png

1598 ms

icon-cas-s.svg

icon-cas-s.svg

1299 ms

icon-zdravotnicka-pece.svg

icon-zdravotnicka-pece.svg

1301 ms

icon-obcerstveni-s.svg

icon-obcerstveni-s.svg

1104 ms

icon-dovolena-s.svg

icon-dovolena-s.svg

1105 ms

icon-osobni-ucet.svg

icon-osobni-ucet.svg

1102 ms

icon-financni-odmeny.svg

icon-financni-odmeny.svg

1098 ms

bg-kariera-320-767.jpg

bg-kariera-320-767.jpg

1100 ms

ico_facebook.svg

ico_facebook.svg

1097 ms

ico_facebook-hover.svg

ico_facebook-hover.svg

1156 ms

ico_linkedin.svg

ico_linkedin.svg

1104 ms

ico_linkedin-hover.svg

ico_linkedin-hover.svg

1101 ms

ico_youtube.svg

ico_youtube.svg

1157 ms

ico_youtube-hover.svg

ico_youtube-hover.svg

1102 ms

ico_message.svg

ico_message.svg

1103 ms

ico_message-hover.svg

ico_message-hover.svg

1102 ms

ico_call.svg

ico_call.svg

1091 ms

ico_call-hover.svg

ico_call-hover.svg

1101 ms

ico_pin.svg

ico_pin.svg

1099 ms

ico_pin-hover.svg

ico_pin-hover.svg

1099 ms

ico_fault.svg

ico_fault.svg

1061 ms

ico_fault-hover.svg

ico_fault-hover.svg

1036 ms

landing

landing

105 ms

Accessibility Review

pre.cz accessibility score

57

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

Document doesn't have a <title> element

High

Image elements do not have [alt] attributes

High

Form elements do not have associated labels

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

SEO Factors

pre.cz SEO score

46

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Document doesn't have a <title> element

High

Image elements do not have [alt] attributes

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    CS

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Pre.cz can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it does not match the claimed Czech language. Our system also found out that Pre.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

pre.cz

Open Graph description is not detected on the main page of PRE. 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: