Access kramerius.mzk.cz. Digitální knihovna Kramerius

name

value

score

weighting

FCP (First Contentful Paint)

Value6.5 s

2/100

10%

LCP (Largest Contentful Paint)

Value9.2 s

1/100

25%

SI (Speed Index)

Value8.3 s

19/100

10%

TBT (Total Blocking Time)

Value820 ms

35/100

30%

CLS (Cumulative Layout Shift)

Value0.011

100/100

15%

TTI (Time to Interactive)

Value10.3 s

25/100

10%

kramerius.mzk.cz

370 ms

2248 ms

jquery-ui.custom.css

367 ms

dateAxisV.css

244 ms

styles.css

248 ms

Our browser made a total of 105 requests to load all elements on the main page. We found that 84% of them (88 requests) were addressed to the original Kramerius.mzk.cz, 5% (5 requests) were made to Apis.google.com and 3% (3 requests) were made to Platform.twitter.com. The less responsive or slowest element that took the longest time to load (2.2 sec) belongs to the original domain Kramerius.mzk.cz.

Content Size

1.3 MB

After Optimization

352.0 kB

In fact, the total size of Kramerius.mzk.cz 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. 55% of websites need less resources to load. Javascripts take 947.7 kB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 159.5 kB

Original 207.1 kB
After minification 194.9 kB
After compression 47.6 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 159.5 kB or 77% of the original size.

Image Optimization

-14%

Potential reduce by 15.9 kB

Original 113.6 kB
After minification 97.6 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, Kramerius Mzk needs image optimization as it can save up to 15.9 kB or 14% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-79%

Potential reduce by 748.8 kB

Original 947.7 kB
After minification 696.4 kB
After compression 198.9 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 748.8 kB or 79% of the original size.

CSS Optimization

-85%

Potential reduce by 43.5 kB

Original 51.3 kB
After minification 34.9 kB
After compression 7.8 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. Kramerius.mzk.cz needs all CSS files to be minified and compressed as it can save up to 43.5 kB or 85% of the original size.

Requests Now

102

After Optimization

The browser has sent 102 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Kramerius Mzk. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 29 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

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

Image elements do not have [alt] attributes

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

Low

Ensure CSP is effective against XSS attacks

High

Serves images with low resolution

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

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

High

robots.txt is not valid

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

High

Image elements do not have [alt] attributes

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

Language and Encoding

Language Detected

N/A
Language Claimed

N/A
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Kramerius.mzk.cz can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else) and no language is claimed in <html> or <meta> tags either. Our system also found out that Kramerius.mzk.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

kramerius.mzk.cz

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

Report Summary

Performance

Accessibility

Best Practices

SEO

Digitální knihovna Kramerius

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

kramerius.mzk.cz

jquery-ui.custom.css

dateAxisV.css

styles.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

kramerius.mzk.cz

jquery-ui.custom.css

dateAxisV.css

styles.css

autocomplete.css

layout-default-latest.css

jquery-1.5.1.min.js

jquery-ui-1.8.11.custom.min.js

settings.js

jquery.mousewheel.js

jquery.layout-latest.js

jquery-ui-timepicker-addon.js

pageQuery.js

main.js

dateAxis_formatV.js

dateAxisV.js

autocomplete.js

jquery.jstree.js

seadragon-min.js

cmn.js

json2.js

plusone.js

jquery.ui.datepicker-en.js

jquery-ui-timepicker-en.js

underscore-min.js

utils.js

jcanvas.js

canvasDa.js

cb=gapi.loaded_0

k5.png

search_orange.png

ui-bg_flat_75_ffffff_40x100.png

ui-bg_glass_75_e6e6e6_1x400.png

ui-icons_222222_256x240.png

custom.jsp

newest.jsp

facets.jsp

browseTitle.jsp

browseAuthor.jsp

collections.jsp

info.jsp

ui-bg_highlight-soft_75_cccccc_1x100.png

ui-bg_glass_65_ffffff_1x400.png

ga.js