Tools & Wizards About Us

Report Summary

  • 21

    Performance

    Renders faster than
    39% of other websites

  • 81

    Accessibility

    Visual factors better than
    that of 51% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 58

    SEO

    Google-friendlier than
    21% of websites

cenum.pl

Katalog monet, ceny monet kolekcjonerskich, monety obiegowe, snajper aukcyjny - Centrum numizmatyczne

Page Load Speed

3.8 sec in total

First Response

321 ms

Resources Loaded

3.1 sec

Page Rendered

359 ms

About Website

Click here to check amazing Cenum content for Poland. Otherwise, check out these important facts you probably never knew about cenum.pl

Centrum numizmatyczne - serwis pozwalający zarządzać kolekcją numizmatów, posiada katalog monet wraz z aktualnymi informacjami na temat aukcyjnych cen monet

Visit cenum.pl

Key Findings

We analyzed Cenum.pl page load time and found that the first response time was 321 ms and then it took 3.4 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

cenum.pl performance score

21

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.4 s

7/100

10%

LCP (Largest Contentful Paint)

Value11.7 s

0/100

25%

SI (Speed Index)

Value7.2 s

29/100

10%

TBT (Total Blocking Time)

Value1,910 ms

8/100

30%

CLS (Cumulative Layout Shift)

Value0.081

94/100

15%

TTI (Time to Interactive)

Value13.0 s

13/100

10%

Network Requests Diagram

cenum.pl

321 ms

style.css

223 ms

jquery.ui.all.css

214 ms

jquery.min.js

21 ms

jquery-ui.min.js

436 ms

Our browser made a total of 154 requests to load all elements on the main page. We found that 82% of them (127 requests) were addressed to the original Cenum.pl, 4% (6 requests) were made to Pagead2.googlesyndication.com and 3% (5 requests) were made to Googleads.g.doubleclick.net. The less responsive or slowest element that took the longest time to load (842 ms) belongs to the original domain Cenum.pl.

Page Optimization Overview & Recommendations

Page size can be reduced by 108.3 kB (10%)

Content Size

1.0 MB

After Optimization

935.4 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Cenum.pl main page is 1.0 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. 60% of websites need less resources to load. Images take 613.3 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 56.0 kB

  • Original 69.6 kB
  • After minification 66.2 kB
  • After compression 13.6 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 56.0 kB or 80% of the original size.

Image Optimization

-2%

Potential reduce by 11.9 kB

  • Original 613.3 kB
  • After minification 601.4 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. Cenum images are well optimized though.

JavaScript Optimization

-10%

Potential reduce by 34.1 kB

  • Original 328.0 kB
  • After minification 328.0 kB
  • After compression 293.9 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. This website has mostly compressed JavaScripts.

CSS Optimization

-19%

Potential reduce by 6.2 kB

  • Original 32.8 kB
  • After minification 32.3 kB
  • After compression 26.5 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. Cenum.pl needs all CSS files to be minified and compressed as it can save up to 6.2 kB or 19% of the original size.

Requests Breakdown

Number of requests can be reduced by 48 (32%)

Requests Now

151

After Optimization

103

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 151 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Cenum. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 24 to 1 for JavaScripts and from 16 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

cenum.pl accessibility score

81

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Image elements do not have [alt] attributes

Best Practices

cenum.pl 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

Page has valid source maps

SEO Factors

cenum.pl SEO score

58

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

Content Best Practices

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

Impact

Issue

High

Image elements do not have [alt] attributes

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 Cenum.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 Cenum.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

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