Access chemia.uj.edu.pl. Wydział Chemii - Wydział Chemii

name

value

score

weighting

FCP (First Contentful Paint)

Value6.9 s

1/100

10%

LCP (Largest Contentful Paint)

Value34.1 s

0/100

25%

SI (Speed Index)

Value15.5 s

0/100

10%

TBT (Total Blocking Time)

Value600 ms

50/100

30%

CLS (Cumulative Layout Shift)

Value0.743

6/100

15%

TTI (Time to Interactive)

Value27.6 s

0/100

10%

chemia.uj.edu.pl

401 ms

chemia.uj.edu.pl

1449 ms

aui.css

266 ms

main.css

507 ms

main.css

378 ms

Our browser made a total of 96 requests to load all elements on the main page. We found that 83% of them (80 requests) were addressed to the original Chemia.uj.edu.pl, 6% (6 requests) were made to Fonts.gstatic.com and 4% (4 requests) were made to Uj.edu.pl. The less responsive or slowest element that took the longest time to load (1.5 sec) belongs to the original domain Chemia.uj.edu.pl.

Content Size

1.3 MB

After Optimization

973.2 kB

In fact, the total size of Chemia.uj.edu.pl main page is 1.3 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. 65% of websites need less resources to load. Javascripts take 548.9 kB which makes up the majority of the site volume.

HTML Optimization

-88%

Potential reduce by 124.0 kB

Original 141.2 kB
After minification 110.3 kB
After compression 17.1 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 30.9 kB, which is 22% 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 124.0 kB or 88% of the original size.

Image Optimization

-42%

Potential reduce by 219.7 kB

Original 524.6 kB
After minification 304.9 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, Chemia Uj needs image optimization as it can save up to 219.7 kB or 42% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-1%

Potential reduce by 7.5 kB

Original 548.9 kB
After minification 548.9 kB
After compression 541.4 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

-12%

Potential reduce by 15.2 kB

Original 124.9 kB
After minification 124.9 kB
After compression 109.7 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. Chemia.uj.edu.pl needs all CSS files to be minified and compressed as it can save up to 15.2 kB or 12% of the original size.

Requests Now

After Optimization

The browser has sent 87 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Chemia Uj. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 59 to 1 for JavaScripts and from 11 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

These are opportunities to improve keyboard navigation in your application.

High

[accesskey] values are not unique

High

[id] attributes on active, focusable elements are not unique

High

Some elements have a [tabindex] value greater than 0

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

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.

High

Links do not have a discernible name

These items highlight common accessibility best practices.

High

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

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

Search Engine Optimization Advices

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

High

Links are not crawlable

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/).

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 Chemia.uj.edu.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 Chemia.uj.edu.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

chemia.uj.edu.pl

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

Report Summary

Performance

Accessibility

Best Practices

SEO

Wydział Chemii - Wydział Chemii - Uniwersytet Jagielloński

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

chemia.uj.edu.pl

chemia.uj.edu.pl

aui.css

main.css

main.css

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

chemia.uj.edu.pl

chemia.uj.edu.pl

aui.css

main.css

main.css

main.css

main.css

barebone.jsp

main.js

main.js

main.js

navigation.js

main.css

css

css

css

jquery.js

modernizr.custom.js

mediaelementplayer.min.css

jquery.justifiedGallery.min.js

mediaelement-and-player.min.js

underscore.js

velocity.js

velocity.ui.js

jquery.blast.js

jquery.mmenu.min.all.js

jquery.fancybox.js

chosen.jquery.1.5.js

moment-with-locales.js

pikaday.js

clndr.js

jquery.justified.js

DropdownMenu.js

AsideMenu.js

ContentGroup.js

Header.js

FormSelect.js

Form.js

AddToCalendar.js

LangDropdown.js

LatestNews.js

MobileMenu.js

Slider.js