Tools & Wizards About Us
zvon.org screenshot

Report Summary

  • 94

    Performance

    Renders faster than
    93% of other websites

  • 48

    Accessibility

    Visual factors better than
    that of 20% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 69

    SEO

    Google-friendlier than
    28% of websites

zvon.org

ZVON.org

Page Load Speed

910 ms in total

First Response

186 ms

Resources Loaded

605 ms

Page Rendered

119 ms

zvon.org screenshot

About Website

Click here to check amazing ZVON content for United States. Otherwise, check out these important facts you probably never knew about zvon.org

cleaning information pipelines: interactive resources about our planet, civilization, and computers

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Key Findings

We analyzed Zvon.org page load time and found that the first response time was 186 ms and then it took 724 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 10% of websites can load faster.

Performance Metrics

zvon.org performance score

94

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.7 s

92/100

10%

LCP (Largest Contentful Paint)

Value2.7 s

85/100

25%

SI (Speed Index)

Value2.4 s

98/100

10%

TBT (Total Blocking Time)

Value90 ms

98/100

30%

CLS (Cumulative Layout Shift)

Value0.008

100/100

15%

TTI (Time to Interactive)

Value3.4 s

93/100

10%

Network Requests Diagram

zvon.org

186 ms

zvon.css

84 ms

jsapi

18 ms

zvon.js

241 ms

ga.js

25 ms

Our browser made a total of 21 requests to load all elements on the main page. We found that 76% of them (16 requests) were addressed to the original Zvon.org, 10% (2 requests) were made to Google-analytics.com and 5% (1 request) were made to Google.com. The less responsive or slowest element that took the longest time to load (248 ms) belongs to the original domain Zvon.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 94.3 kB (45%)

Content Size

208.5 kB

After Optimization

114.3 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Zvon.org main page is 208.5 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. 25% of websites need less resources to load. Javascripts take 125.2 kB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 13.3 kB

  • Original 17.1 kB
  • After minification 13.6 kB
  • After compression 3.8 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. This page needs HTML code to be minified as it can gain 3.5 kB, which is 21% 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 13.3 kB or 78% of the original size.

Image Optimization

-3%

Potential reduce by 1.4 kB

  • Original 40.6 kB
  • After minification 39.2 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. ZVON images are well optimized though.

JavaScript Optimization

-47%

Potential reduce by 59.3 kB

  • Original 125.2 kB
  • After minification 111.1 kB
  • After compression 65.9 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 59.3 kB or 47% of the original size.

CSS Optimization

-79%

Potential reduce by 20.2 kB

  • Original 25.6 kB
  • After minification 20.4 kB
  • After compression 5.4 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. Zvon.org needs all CSS files to be minified and compressed as it can save up to 20.2 kB or 79% of the original size.

Requests Breakdown

Number of requests can be reduced by 9 (47%)

Requests Now

19

After Optimization

10

  • Images
  • JavaScript
  • CSS

The browser has sent 19 CSS, Javascripts, AJAX and image requests in order to completely render the main page of ZVON. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

zvon.org

zvon.org

186 ms

zvon.css

zvon.css

84 ms

jsapi

jsapi

18 ms

zvon.js

zvon.js

241 ms

ga.js

ga.js

25 ms

jquery.min.js

jquery.min.js

41 ms

zvon.png

zvon.png

82 ms

key_small.png

key_small.png

168 ms

grad1.png

grad1.png

169 ms

comp.png

comp.png

169 ms

comp_small.png

comp_small.png

170 ms

law_small.png

law_small.png

169 ms

lib_small.png

lib_small.png

219 ms

eco_small.png

eco_small.png

237 ms

key.png

key.png

248 ms

__utm.gif

__utm.gif

24 ms

plus_google.gif

plus_google.gif

24 ms

home.png

home.png

83 ms

note_iPhone.png

note_iPhone.png

85 ms

icon_sprite.png

icon_sprite.png

132 ms

email_sprite.png

email_sprite.png

152 ms

Accessibility Review

zvon.org accessibility score

48

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.

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

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

zvon.org 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

Browser errors were logged to the console

SEO Factors

zvon.org SEO score

69

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

Image elements do not have [alt] attributes

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Zvon.org can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Zvon.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

zvon.org

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