Tools & Wizards About Us
coderslab.pl screenshot

Report Summary

  • 22

    Performance

    Renders faster than
    40% of other websites

  • 94

    Accessibility

    Visual factors better than
    that of 83% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 93

    SEO

    Google-friendlier than
    83% of websites

coderslab.pl

Kursy programowania – szkolenia, kursy IT (informatyczne) online, bootcamp programistyczny – Szkoła Programowania Coders Lab

Page Load Speed

3.7 sec in total

First Response

45 ms

Resources Loaded

2.4 sec

Page Rendered

1.2 sec

coderslab.pl screenshot

About Website

Welcome to coderslab.pl homepage info - get ready to check Coders Lab best content for Poland right away, or after learning these important things about coderslab.pl

Rozwijaj się w IT z naszą szkołą IT! Odkryj różnorodne kursy programowania, machine learningu i wiele innych. Sprawdź nasze kursy już teraz! 💻

Visit coderslab.pl

Key Findings

We analyzed Coderslab.pl page load time and found that the first response time was 45 ms and then it took 3.7 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

coderslab.pl performance score

22

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.4 s

38/100

10%

LCP (Largest Contentful Paint)

Value9.8 s

0/100

25%

SI (Speed Index)

Value7.8 s

23/100

10%

TBT (Total Blocking Time)

Value2,350 ms

5/100

30%

CLS (Cumulative Layout Shift)

Value0.094

91/100

15%

TTI (Time to Interactive)

Value17.6 s

4/100

10%

Network Requests Diagram

coderslab.pl

45 ms

coderslab.pl

160 ms

pl

973 ms

865cab3455ced939.css

41 ms

91f529120df06919.css

33 ms

Our browser made a total of 101 requests to load all elements on the main page. We found that 80% of them (81 requests) were addressed to the original Coderslab.pl, 17% (17 requests) were made to Www-api.coderslab.pl and 1% (1 request) were made to Static.payu.com. The less responsive or slowest element that took the longest time to load (973 ms) belongs to the original domain Coderslab.pl.

Page Optimization Overview & Recommendations

Page size can be reduced by 282.5 kB (10%)

Content Size

2.7 MB

After Optimization

2.5 MB

  • HTML
  • Images
  • JavaScript

In fact, the total size of Coderslab.pl main page is 2.7 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

-83%

Potential reduce by 281.5 kB

  • Original 341.1 kB
  • After minification 341.0 kB
  • After compression 59.6 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 281.5 kB or 83% of the original size.

Image Optimization

-0%

Potential reduce by 850 B

  • Original 2.3 MB
  • After minification 2.3 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. Coders Lab images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 125 B

  • Original 88.2 kB
  • After minification 88.2 kB
  • After compression 88.1 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.

Requests Breakdown

Number of requests can be reduced by 47 (48%)

Requests Now

98

After Optimization

51

  • Images
  • JavaScript
  • CSS

The browser has sent 98 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Coders Lab. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 36 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

coderslab.pl

coderslab.pl

45 ms

coderslab.pl

coderslab.pl

160 ms

pl

pl

973 ms

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865cab3455ced939.css

41 ms

91f529120df06919.css

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33 ms

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56 ms

widget-products-installments.min.js

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782 ms

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69 ms

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31 ms

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32 ms

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55 ms

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65 ms

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83 ms

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98 ms

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82 ms

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83 ms

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85 ms

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89 ms

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104 ms

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114 ms

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104 ms

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389 ms

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116 ms

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117 ms

_buildManifest.js

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391 ms

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393 ms

vcd15cbe7772f49c399c6a5babf22c1241717689176015

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70 ms

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57 ms

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348 ms

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347 ms

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341 ms

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47 ms

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835 ms

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836 ms

Accessibility Review

coderslab.pl accessibility score

94

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

[aria-hidden="true"] elements contain focusable descendents

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.

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

Best Practices

coderslab.pl 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

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

coderslab.pl SEO score

93

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

    PL

  • Language Claimed

    PL

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Coderslab.pl can be misinterpreted by Google and other search engines. Our service has detected that Polish is used on the page, and it matches the claimed language. Our system also found out that Coderslab.pl 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

coderslab.pl

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