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dan.org screenshot

Report Summary

  • 7

    Performance

    Renders faster than
    22% of other websites

  • 91

    Accessibility

    Visual factors better than
    that of 77% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 91

    SEO

    Google-friendlier than
    71% of websites

dan.org

Home - Divers Alert Network

Page Load Speed

1.4 sec in total

First Response

102 ms

Resources Loaded

1.1 sec

Page Rendered

198 ms

dan.org screenshot

About Website

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

DAN promotes diver safety worldwide through research, medicine, education & emergency support. Get answers: What should divers do for their own safety?

Visit dan.org

Key Findings

We analyzed Dan.org page load time and found that the first response time was 102 ms and then it took 1.3 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 25% of websites can load faster.

Performance Metrics

dan.org performance score

7

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.1 s

3/100

10%

LCP (Largest Contentful Paint)

Value17.5 s

0/100

25%

SI (Speed Index)

Value10.9 s

6/100

10%

TBT (Total Blocking Time)

Value1,780 ms

10/100

30%

CLS (Cumulative Layout Shift)

Value0.525

14/100

15%

TTI (Time to Interactive)

Value15.4 s

7/100

10%

Network Requests Diagram

dan.org

102 ms

www.diversalertnetwork.org

322 ms

std.js

138 ms

jquery.js

361 ms

org2.css

185 ms

Our browser made a total of 23 requests to load all elements on the main page. We found that 4% of them (1 request) were addressed to the original Dan.org, 65% (15 requests) were made to Diversalertnetwork.org and 17% (4 requests) were made to Danintranet.org. The less responsive or slowest element that took the longest time to load (404 ms) relates to the external source Danintranet.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 151.1 kB (18%)

Content Size

827.7 kB

After Optimization

676.5 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Dan.org main page is 827.7 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. Only 10% of websites need less resources to load. Images take 621.9 kB which makes up the majority of the site volume.

HTML Optimization

-66%

Potential reduce by 10.4 kB

  • Original 15.7 kB
  • After minification 15.7 kB
  • After compression 5.3 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 10.4 kB or 66% of the original size.

Image Optimization

-2%

Potential reduce by 13.8 kB

  • Original 621.9 kB
  • After minification 608.1 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. Dan images are well optimized though.

JavaScript Optimization

-64%

Potential reduce by 105.2 kB

  • Original 163.8 kB
  • After minification 160.0 kB
  • After compression 58.6 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 105.2 kB or 64% of the original size.

CSS Optimization

-82%

Potential reduce by 21.7 kB

  • Original 26.3 kB
  • After minification 18.9 kB
  • After compression 4.6 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. Dan.org needs all CSS files to be minified and compressed as it can save up to 21.7 kB or 82% of the original size.

Requests Breakdown

Number of requests can be reduced by 4 (19%)

Requests Now

21

After Optimization

17

  • Images
  • JavaScript
  • CSS

The browser has sent 21 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dan. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 5 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

dan.org

dan.org

102 ms

www.diversalertnetwork.org

www.diversalertnetwork.org

322 ms

std.js

std.js

138 ms

jquery.js

jquery.js

361 ms

org2.css

org2.css

185 ms

landing.css

landing.css

139 ms

tw-sack.js

tw-sack.js

137 ms

bgwatermark.js

bgwatermark.js

158 ms

mhome.css

mhome.css

182 ms

analytics.js

analytics.js

38 ms

17014.jpg

17014.jpg

356 ms

17015.jpg

17015.jpg

353 ms

17016.jpg

17016.jpg

357 ms

17017.jpg

17017.jpg

404 ms

thbg.png

thbg.png

48 ms

deptGraphics2.jpg

deptGraphics2.jpg

186 ms

deptGraphics2.jpg

deptGraphics2.jpg

234 ms

danlogo.png

danlogo.png

51 ms

buttonbg2.png

buttonbg2.png

73 ms

searchIcon.png

searchIcon.png

51 ms

social.gif

social.gif

93 ms

collect

collect

10 ms

collect

collect

71 ms

Accessibility Review

dan.org accessibility score

91

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

Best Practices

dan.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

dan.org SEO score

91

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

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

    N/A

  • Encoding

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Dan.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 Dan.org main page’s claimed encoding is iso-8859-1. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

dan.org

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