Tools & Wizards About Us

Report Summary

  • 76

    Performance

    Renders faster than
    84% of other websites

  • 80

    Accessibility

    Visual factors better than
    that of 50% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 83

    SEO

    Google-friendlier than
    46% of websites

books.zkoss.org

ZK Framework | Documentation | ZK

Page Load Speed

3.8 sec in total

First Response

186 ms

Resources Loaded

3.4 sec

Page Rendered

172 ms

About Website

Visit books.zkoss.org now to see the best up-to-date Books ZK Oss content for Italy and also check out these interesting facts you probably never knew about books.zkoss.org

A highly productive open source Java framework for building amazing enterprise web and mobile applications.

Visit books.zkoss.org

Key Findings

We analyzed Books.zkoss.org page load time and found that the first response time was 186 ms and then it took 3.6 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

books.zkoss.org performance score

76

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.8 s

28/100

10%

LCP (Largest Contentful Paint)

Value3.8 s

56/100

25%

SI (Speed Index)

Value3.8 s

84/100

10%

TBT (Total Blocking Time)

Value80 ms

99/100

30%

CLS (Cumulative Layout Shift)

Value0.045

99/100

15%

TTI (Time to Interactive)

Value6.2 s

62/100

10%

Network Requests Diagram

books.zkoss.org

186 ms

documentation

297 ms

template

173 ms

css

64 ms

doc

179 ms

Our browser made a total of 80 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Books.zkoss.org, 50% (40 requests) were made to Zkoss.org and 9% (7 requests) were made to Apis.google.com. The less responsive or slowest element that took the longest time to load (1.9 sec) relates to the external source Apis.google.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 287.5 kB (53%)

Content Size

541.3 kB

After Optimization

253.9 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Books.zkoss.org main page is 541.3 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. 50% of websites need less resources to load. HTML takes 226.3 kB which makes up the majority of the site volume.

HTML Optimization

-87%

Potential reduce by 196.3 kB

  • Original 226.3 kB
  • After minification 219.7 kB
  • After compression 29.9 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 196.3 kB or 87% of the original size.

Image Optimization

-0%

Potential reduce by 644 B

  • Original 136.0 kB
  • After minification 135.4 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. Books ZK Oss images are well optimized though.

JavaScript Optimization

-50%

Potential reduce by 89.8 kB

  • Original 178.1 kB
  • After minification 178.1 kB
  • After compression 88.3 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 89.8 kB or 50% of the original size.

CSS Optimization

-69%

Potential reduce by 695 B

  • Original 1.0 kB
  • After minification 920 B
  • After compression 313 B

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. Books.zkoss.org needs all CSS files to be minified and compressed as it can save up to 695 B or 69% of the original size.

Requests Breakdown

Number of requests can be reduced by 48 (63%)

Requests Now

76

After Optimization

28

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 76 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Books ZK Oss. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 25 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

books.zkoss.org accessibility score

80

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.

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

Form elements do not have associated labels

Best Practices

books.zkoss.org best practices score

83

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

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

books.zkoss.org SEO score

83

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

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

Language and Encoding

  • Language Detected

    N/A

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Books.zkoss.org 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), while the claimed language is English. Our system also found out that Books.zkoss.org 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 data is detected on the main page of Books ZK Oss. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: