Tools & Wizards About Us
nerds.cz screenshot

Report Summary

  • 38

    Performance

    Renders faster than
    57% of other websites

  • 59

    Accessibility

    Visual factors better than
    that of 26% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

nerds.cz

Geek trička a originální IT trička s vtipným potiskem - Geekworld.cz - Hadry pro Ajťáky

Page Load Speed

3.6 sec in total

First Response

314 ms

Resources Loaded

3 sec

Page Rendered

316 ms

nerds.cz screenshot

About Website

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

Originální IT trička, linux trička a Geek trička s potiskem pro geek a Ajťáky. Ideální vánoční geek dárky pro otce a syny. Moderní designová geek trika.

Visit nerds.cz

Key Findings

We analyzed Nerds.cz page load time and found that the first response time was 314 ms and then it took 3.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.

Performance Metrics

nerds.cz performance score

38

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.3 s

40/100

10%

LCP (Largest Contentful Paint)

Value4.1 s

48/100

25%

SI (Speed Index)

Value8.5 s

18/100

10%

TBT (Total Blocking Time)

Value1,280 ms

18/100

30%

CLS (Cumulative Layout Shift)

Value0.106

88/100

15%

TTI (Time to Interactive)

Value11.6 s

18/100

10%

Network Requests Diagram

nerds.cz

314 ms

geekworld.cz

784 ms

global.css

33 ms

highdpi.css

31 ms

responsive-tables.css

29 ms

Our browser made a total of 236 requests to load all elements on the main page. We found that 0% of them (1 request) were addressed to the original Nerds.cz, 93% (219 requests) were made to Geekworld.cz and 3% (7 requests) were made to App.livechatoo.com. The less responsive or slowest element that took the longest time to load (1.2 sec) relates to the external source Geekworld.cz.

Page Optimization Overview & Recommendations

Page size can be reduced by 362.0 kB (8%)

Content Size

4.6 MB

After Optimization

4.3 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Nerds.cz main page is 4.6 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. Only a small number of websites need less resources to load. Images take 3.8 MB which makes up the majority of the site volume.

HTML Optimization

-88%

Potential reduce by 268.6 kB

  • Original 304.2 kB
  • After minification 304.2 kB
  • After compression 35.6 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 268.6 kB or 88% of the original size.

Image Optimization

-2%

Potential reduce by 60.1 kB

  • Original 3.8 MB
  • After minification 3.8 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. Nerds images are well optimized though.

JavaScript Optimization

-8%

Potential reduce by 33.0 kB

  • Original 420.2 kB
  • After minification 420.2 kB
  • After compression 387.2 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

-1%

Potential reduce by 364 B

  • Original 71.4 kB
  • After minification 71.4 kB
  • After compression 71.0 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. Nerds.cz has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 51 (30%)

Requests Now

168

After Optimization

117

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 168 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Nerds. 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 42 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

nerds.cz

nerds.cz

314 ms

geekworld.cz

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784 ms

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33 ms

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geekworld.cz

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741 ms

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originalni-tricko-mp345.jpg

originalni-tricko-mp345.jpg

114 ms

html-stylist-geek-tricko.jpg

html-stylist-geek-tricko.jpg

111 ms

detsky-overal-kocky-15-16.jpg

detsky-overal-kocky-15-16.jpg

112 ms

404-error-love-not-found-damske-geek-tricko.jpg

404-error-love-not-found-damske-geek-tricko.jpg

113 ms

pixie-crew-skolni-penal-pxa-05-kulaty-cerny.jpg

pixie-crew-skolni-penal-pxa-05-kulaty-cerny.jpg

101 ms

sprite.png

sprite.png

124 ms

stopar.jpg

stopar.jpg

122 ms

Accessibility Review

nerds.cz accessibility score

59

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

Form elements do not have associated labels

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

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

nerds.cz best practices score

67

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

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

High

Missing source maps for large first-party JavaScript

SEO Factors

nerds.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

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 Nerds.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 Nerds.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

nerds.cz

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