Tools & Wizards About Us
zkoss.org screenshot

Report Summary

  • 58

    Performance

    Renders faster than
    74% of other websites

  • 84

    Accessibility

    Visual factors better than
    that of 56% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 75

    SEO

    Google-friendlier than
    32% of websites

zkoss.org

Leading Enterprise Java Web Framework | ZK

Page Load Speed

3.3 sec in total

First Response

198 ms

Resources Loaded

2.6 sec

Page Rendered

510 ms

zkoss.org screenshot

About Website

Click here to check amazing ZK Oss content for Italy. Otherwise, check out these important facts you probably never knew about zkoss.org

ZK is the leading open source Ajax + Mobile Java Web framework integrating jQuery, Spring, JPA, Hibernate, JavaEE, Grails, Scala and many more.

Visit zkoss.org

Key Findings

We analyzed Zkoss.org page load time and found that the first response time was 198 ms and then it took 3.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.

Performance Metrics

zkoss.org performance score

58

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.3 s

41/100

10%

LCP (Largest Contentful Paint)

Value3.3 s

71/100

25%

SI (Speed Index)

Value5.5 s

55/100

10%

TBT (Total Blocking Time)

Value770 ms

38/100

30%

CLS (Cumulative Layout Shift)

Value0.005

100/100

15%

TTI (Time to Interactive)

Value8.4 s

39/100

10%

Network Requests Diagram

zkoss.org

198 ms

www.zkoss.org

215 ms

www.zkoss.org

315 ms

template

283 ms

css

39 ms

Our browser made a total of 109 requests to load all elements on the main page. We found that 85% of them (93 requests) were addressed to the original Zkoss.org, 4% (4 requests) were made to Fonts.gstatic.com and 3% (3 requests) were made to Fonts.googleapis.com. The less responsive or slowest element that took the longest time to load (1 sec) belongs to the original domain Zkoss.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 168.9 kB (13%)

Content Size

1.3 MB

After Optimization

1.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Zkoss.org 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. 35% of websites need less resources to load. Images take 979.8 kB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 54.7 kB

  • Original 65.6 kB
  • After minification 59.0 kB
  • After compression 10.8 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 54.7 kB or 83% of the original size.

Image Optimization

-9%

Potential reduce by 91.3 kB

  • Original 979.8 kB
  • After minification 888.5 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. ZK Oss images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 418 B

  • Original 214.5 kB
  • After minification 214.5 kB
  • After compression 214.1 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

-90%

Potential reduce by 22.4 kB

  • Original 25.0 kB
  • After minification 2.9 kB
  • After compression 2.6 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. Zkoss.org needs all CSS files to be minified and compressed as it can save up to 22.4 kB or 90% of the original size.

Requests Breakdown

Number of requests can be reduced by 27 (27%)

Requests Now

100

After Optimization

73

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 100 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 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 12 to 1 for JavaScripts and from 9 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

zkoss.org

zkoss.org

198 ms

www.zkoss.org

www.zkoss.org

215 ms

www.zkoss.org

www.zkoss.org

315 ms

template

template

283 ms

css

css

39 ms

index

index

117 ms

slick.css

slick.css

126 ms

jquery.min.js

jquery.min.js

127 ms

jquery-migrate-1.4.1.min.js

jquery-migrate-1.4.1.min.js

124 ms

stuck.css

stuck.css

112 ms

css

css

42 ms

css2

css2

42 ms

font-awesome.min.css

font-awesome.min.css

208 ms

banner

banner

218 ms

template.js

template.js

253 ms

banner.js

banner.js

137 ms

client.js

client.js

35 ms

gaz.js

gaz.js

225 ms

conversion.js

conversion.js

92 ms

index.js

index.js

310 ms

slick.min.js

slick.min.js

340 ms

ZK-logo.svg

ZK-logo.svg

161 ms

Header_ZK.jpg

Header_ZK.jpg

264 ms

chart.svg

chart.svg

164 ms

spreadsheet.svg

spreadsheet.svg

159 ms

theme.svg

theme.svg

161 ms

Pivottable.svg

Pivottable.svg

162 ms

test.svg

test.svg

264 ms

studio.svg

studio.svg

204 ms

plugin.svg

plugin.svg

261 ms

Demo.svg

Demo.svg

267 ms

build.svg

build.svg

267 ms

Documentation.svg

Documentation.svg

306 ms

Support.svg

Support.svg

365 ms

tutorial.svg

tutorial.svg

391 ms

Forum.svg

Forum.svg

279 ms

About.svg

About.svg

366 ms

Pricing.svg

Pricing.svg

285 ms

ee.svg

ee.svg

385 ms

Contact.svg

Contact.svg

392 ms

main-banner-image-10.png

main-banner-image-10.png

432 ms

ZK_Training_Responsive_Design_in_ZK.png

ZK_Training_Responsive_Design_in_ZK.png

495 ms

ZK10.png

ZK10.png

506 ms

Keikai6_comingsoon.png

Keikai6_comingsoon.png

401 ms

ZK_Training_Responsive_Design_in_ZK_mobile.png

ZK_Training_Responsive_Design_in_ZK_mobile.png

523 ms

ZK10_mobile.png

ZK10_mobile.png

533 ms

Keikai6_comingsoon_mobile.png

Keikai6_comingsoon_mobile.png

548 ms

rapid-development.png

rapid-development.png

558 ms

BAML.png

BAML.png

631 ms

deutsche-bank.png

deutsche-bank.png

646 ms

accenture.png

accenture.png

538 ms

Sony.png

Sony.png

662 ms

dod.png

dod.png

552 ms

EUC.png

EUC.png

677 ms

ebay.png

ebay.png

672 ms

KFOlCnqEu92Fr1MmSU5fBBc9.ttf

KFOlCnqEu92Fr1MmSU5fBBc9.ttf

39 ms

KFOmCnqEu92Fr1Mu4mxP.ttf

KFOmCnqEu92Fr1Mu4mxP.ttf

40 ms

KFOlCnqEu92Fr1MmEU9vAw.ttf

KFOlCnqEu92Fr1MmEU9vAw.ttf

145 ms

KFOlCnqEu92Fr1MmWUlfBBc9.ttf

KFOlCnqEu92Fr1MmWUlfBBc9.ttf

186 ms

Toyota.png

Toyota.png

667 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

740 ms

cb=gapi.loaded_0

cb=gapi.loaded_0

111 ms

analytics.js

analytics.js

153 ms

csp-report

csp-report

868 ms

170 ms

Dreamworks.png

Dreamworks.png

623 ms

soprasteria.png

soprasteria.png

653 ms

bt.png

bt.png

630 ms

Swiss-re.png

Swiss-re.png

660 ms

Oracle.png

Oracle.png

751 ms

tsystem.png

tsystem.png

713 ms

collect

collect

12 ms

collect

collect

33 ms

33 ms

roche.png

roche.png

652 ms

Airbus.png

Airbus.png

567 ms

HTC.png

HTC.png

691 ms

Johns-Hopkins.png

Johns-Hopkins.png

580 ms

Telstra.png

Telstra.png

715 ms

ga-audiences

ga-audiences

18 ms

docomo.png

docomo.png

649 ms

Barclays.png

Barclays.png

1004 ms

mmc.png

mmc.png

744 ms

Sun_Partner_Advantage_(small).png

Sun_Partner_Advantage_(small).png

916 ms

ADP.png

ADP.png

578 ms

fujitsu.png

fujitsu.png

676 ms

20thcenturyfox.png

20thcenturyfox.png

692 ms

emc2.png

emc2.png

720 ms

Samsung.png

Samsung.png

776 ms

telecom.png

telecom.png

764 ms

un.png

un.png

602 ms

simply-java.png

simply-java.png

725 ms

Enterprise-level-Security.png

Enterprise-level-Security.png

604 ms

Innovation-technology.png

Innovation-technology.png

613 ms

Open-source-2.png

Open-source-2.png

732 ms

ZK.svg

ZK.svg

719 ms

NA.svg

NA.svg

973 ms

null.svg

null.svg

803 ms

Performance.svg

Performance.svg

760 ms

Features.svg

Features.svg

740 ms

Support.svg

Support.svg

739 ms

ossf_logobsim.jpg

ossf_logobsim.jpg

629 ms

search-white.svg

search-white.svg

742 ms

close.svg

close.svg

775 ms

facebook.svg

facebook.svg

708 ms

linkedin.svg

linkedin.svg

697 ms

twitter.svg

twitter.svg

707 ms

arrow-left.svg

arrow-left.svg

723 ms

arrow-right.svg

arrow-right.svg

779 ms

Accessibility Review

zkoss.org accessibility score

84

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

Image elements do not have [alt] attributes

High

Form elements do not have associated labels

High

Links do not have a discernible name

Best Practices

zkoss.org best practices score

75

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

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

zkoss.org SEO score

75

Search Engine Optimization Advices

Content Best Practices

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

Impact

Issue

High

Links do not have descriptive text

High

Image elements do not have [alt] attributes

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

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Zkoss.org can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that 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

zkoss.org

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