Tools & Wizards About Us

Report Summary

  • 95

    Performance

    Renders faster than
    93% of other websites

  • 94

    Accessibility

    Visual factors better than
    that of 83% of websites

  • 42

    Best Practices

    More advanced features
    available than in
    19% of websites

  • 67

    SEO

    Google-friendlier than
    26% of websites

slaviz.pl

Kursy Komputerowe - Język Niderlandzki Holenderski | Łódź

Page Load Speed

1.8 sec in total

First Response

317 ms

Resources Loaded

1.3 sec

Page Rendered

231 ms

About Website

Visit slaviz.pl now to see the best up-to-date Slaviz content and also check out these interesting facts you probably never knew about slaviz.pl

SLAVIZ oferuje Kursy Językowe oraz Kursy-Szkolenia Komputerowe. Szkolenia przeprowadzamy na terenie woj.łódzkiego. Oferujemy dojazd do klienta z własnym sprzętem. Oferujemy Język niderlandzki-holender...

Visit slaviz.pl

Key Findings

We analyzed Slaviz.pl page load time and found that the first response time was 317 ms and then it took 1.5 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 30% of websites can load faster.

Performance Metrics

slaviz.pl performance score

95

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.7 s

92/100

10%

LCP (Largest Contentful Paint)

Value1.7 s

99/100

25%

SI (Speed Index)

Value2.2 s

99/100

10%

TBT (Total Blocking Time)

Value30 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.159

73/100

15%

TTI (Time to Interactive)

Value1.7 s

100/100

10%

Network Requests Diagram

slaviz.pl

317 ms

layout.css

98 ms

jquery-1.4.1.min.js

286 ms

jquery.jcarousel.pack.js

192 ms

jquery.jcarousel.setup.js

193 ms

Our browser made a total of 40 requests to load all elements on the main page. We found that 98% of them (39 requests) were addressed to the original Slaviz.pl, 3% (1 request) were made to Stat.cal.pl. The less responsive or slowest element that took the longest time to load (671 ms) belongs to the original domain Slaviz.pl.

Page Optimization Overview & Recommendations

Page size can be reduced by 45.0 kB (13%)

Content Size

335.4 kB

After Optimization

290.4 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Slaviz.pl main page is 335.4 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. 30% of websites need less resources to load. Images take 289.3 kB which makes up the majority of the site volume.

HTML Optimization

-71%

Potential reduce by 9.9 kB

  • Original 13.9 kB
  • After minification 12.0 kB
  • After compression 4.0 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. This page needs HTML code to be minified as it can gain 1.9 kB, which is 13% 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 9.9 kB or 71% of the original size.

Image Optimization

-12%

Potential reduce by 33.9 kB

  • Original 289.3 kB
  • After minification 255.4 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. Obviously, Slaviz needs image optimization as it can save up to 33.9 kB or 12% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-2%

Potential reduce by 460 B

  • Original 28.4 kB
  • After minification 28.4 kB
  • After compression 28.0 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

-19%

Potential reduce by 703 B

  • Original 3.8 kB
  • After minification 3.8 kB
  • After compression 3.1 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. Slaviz.pl needs all CSS files to be minified and compressed as it can save up to 703 B or 19% of the original size.

Requests Breakdown

Number of requests can be reduced by 3 (8%)

Requests Now

38

After Optimization

35

  • Images
  • JavaScript
  • CSS

The browser has sent 38 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Slaviz. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

slaviz.pl accessibility score

94

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.

Best Practices

slaviz.pl best practices score

42

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

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

slaviz.pl SEO score

67

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

Language and Encoding

  • Language Detected

    PL

  • Language Claimed

    EN

  • Encoding

    ISO-8859-2

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Slaviz.pl can be misinterpreted by Google and other search engines. Our service has detected that Polish is used on the page, and it does not match the claimed English language. Our system also found out that Slaviz.pl main page’s claimed encoding is iso-8859-2. 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

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