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redwave.cz screenshot

Report Summary

  • 82

    Performance

    Renders faster than
    87% of other websites

  • 80

    Accessibility

    Visual factors better than
    that of 49% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 69

    SEO

    Google-friendlier than
    28% of websites

redwave.cz

Infratopen? REDWAVE.CZ

Page Load Speed

23.8 sec in total

First Response

536 ms

Resources Loaded

23.2 sec

Page Rendered

134 ms

redwave.cz screenshot

About Website

Visit redwave.cz now to see the best up-to-date REDWAVE content and also check out these interesting facts you probably never knew about redwave.cz

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Visit redwave.cz

Key Findings

We analyzed Redwave.cz page load time and found that the first response time was 536 ms and then it took 23.3 sec to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster. Unfortunately, there was 1 request timeout, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

Performance Metrics

redwave.cz performance score

82

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.7 s

60/100

10%

LCP (Largest Contentful Paint)

Value3.3 s

70/100

25%

SI (Speed Index)

Value6.4 s

40/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.001

100/100

15%

TTI (Time to Interactive)

Value3.5 s

92/100

10%

Network Requests Diagram

redwave.cz

536 ms

www.redwave.cz

635 ms

style.css

277 ms

lightbox.css

191 ms

prototype.js

1035 ms

Our browser made a total of 27 requests to load all elements on the main page. We found that 93% of them (25 requests) were addressed to the original Redwave.cz, 4% (1 request) were made to C1.navrcholu.cz and 4% (1 request) were made to Toplist.cz. The less responsive or slowest element that took the longest time to load (20.2 sec) relates to the external source Toplist.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 192.7 kB (40%)

Content Size

483.0 kB

After Optimization

290.2 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Redwave.cz main page is 483.0 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. 15% of websites need less resources to load. Images take 264.2 kB which makes up the majority of the site volume.

HTML Optimization

-71%

Potential reduce by 7.5 kB

  • Original 10.7 kB
  • After minification 9.3 kB
  • After compression 3.1 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 1.3 kB, which is 12% 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 7.5 kB or 71% of the original size.

Image Optimization

-6%

Potential reduce by 15.3 kB

  • Original 264.2 kB
  • After minification 248.8 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. REDWAVE images are well optimized though.

JavaScript Optimization

-82%

Potential reduce by 156.3 kB

  • Original 191.1 kB
  • After minification 137.0 kB
  • After compression 34.8 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 156.3 kB or 82% of the original size.

CSS Optimization

-80%

Potential reduce by 13.6 kB

  • Original 17.0 kB
  • After minification 13.8 kB
  • After compression 3.4 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. Redwave.cz needs all CSS files to be minified and compressed as it can save up to 13.6 kB or 80% of the original size.

Requests Breakdown

Number of requests can be reduced by 5 (22%)

Requests Now

23

After Optimization

18

  • Images
  • JavaScript
  • CSS

The browser has sent 23 CSS, Javascripts, AJAX and image requests in order to completely render the main page of REDWAVE. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

redwave.cz

redwave.cz

536 ms

www.redwave.cz

www.redwave.cz

635 ms

style.css

style.css

277 ms

lightbox.css

lightbox.css

191 ms

prototype.js

prototype.js

1035 ms

scriptaculous.js

scriptaculous.js

284 ms

lightbox.js

lightbox.js

473 ms

obr.js

obr.js

194 ms

code

code

205 ms

effects.js

effects.js

565 ms

builder.js

builder.js

188 ms

bg.jpg

bg.jpg

96 ms

shadow.png

shadow.png

99 ms

top.jpg

top.jpg

565 ms

undr_head.jpg

undr_head.jpg

284 ms

flag_ru.jpg

flag_ru.jpg

284 ms

flag_cz.jpg

flag_cz.jpg

282 ms

menu2.jpg

menu2.jpg

282 ms

slunce.jpg

slunce.jpg

472 ms

bottom2.jpg

bottom2.jpg

564 ms

czin.jpg

czin.jpg

382 ms

cent.jpg

cent.jpg

471 ms

zona.jpg

zona.jpg

472 ms

loading.gif

loading.gif

442 ms

closelabel.gif

closelabel.gif

541 ms

count.asp

count.asp

20199 ms

print.css

print.css

96 ms

Accessibility Review

redwave.cz accessibility score

80

Accessibility Issues

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.

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

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

redwave.cz best practices score

67

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

Browser errors were logged to the console

SEO Factors

redwave.cz SEO score

69

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

robots.txt is not valid

Language and Encoding

  • Language Detected

    CS

  • Language Claimed

    N/A

  • Encoding

    WINDOWS-1250

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Redwave.cz can be misinterpreted by Google and other search engines. Our service has detected that Czech is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Redwave.cz main page’s claimed encoding is windows-1250. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

redwave.cz

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