Tools & Wizards About Us
cardiacscience.com screenshot

Report Summary

  • 3

    Performance

    Renders faster than
    20% of other websites

  • 87

    Accessibility

    Visual factors better than
    that of 66% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 86

    SEO

    Google-friendlier than
    60% of websites

cardiacscience.com

Public Access Defibrillator - ZOLL Medical

Page Load Speed

3.2 sec in total

First Response

528 ms

Resources Loaded

2.6 sec

Page Rendered

136 ms

cardiacscience.com screenshot

About Website

Click here to check amazing Cardiacscience content for United States. Otherwise, check out these important facts you probably never knew about cardiacscience.com

ZOLL offers lightweight and portable automated external defibrillators (AEDs) designed to assist lay rescuers. Learn more about our AEDs and Real CPR Help technology.

Visit cardiacscience.com

Key Findings

We analyzed Cardiacscience.com page load time and found that the first response time was 528 ms and then it took 2.7 sec to load all DOM resources and completely render a web page. This is a poor result, as 50% of websites can load faster.

Performance Metrics

cardiacscience.com performance score

3

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.9 s

4/100

10%

LCP (Largest Contentful Paint)

Value50.6 s

0/100

25%

SI (Speed Index)

Value11.0 s

6/100

10%

TBT (Total Blocking Time)

Value2,630 ms

4/100

30%

CLS (Cumulative Layout Shift)

Value0.984

2/100

15%

TTI (Time to Interactive)

Value39.8 s

0/100

10%

Network Requests Diagram

aeds-for-public-access

528 ms

Bootstrap.js

80 ms

0552c7d7-62e0-4163-900d-2374c78f3501.css

52 ms

css

52 ms

slick.css

40 ms

Our browser made a total of 158 requests to load all elements on the main page. We found that 0% of them (0 request) were addressed to the original Cardiacscience.com, 32% (50 requests) were made to Fonts.gstatic.com and 3% (4 requests) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (1.1 sec) relates to the external source Zoll.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.5 MB (12%)

Content Size

12.3 MB

After Optimization

10.8 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Cardiacscience.com main page is 12.3 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. Only a small number of websites need less resources to load. Images take 11.7 MB which makes up the majority of the site volume.

HTML Optimization

-93%

Potential reduce by 223.2 kB

  • Original 240.6 kB
  • After minification 107.9 kB
  • After compression 17.5 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 132.8 kB, which is 55% 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 223.2 kB or 93% of the original size.

Image Optimization

-10%

Potential reduce by 1.1 MB

  • Original 11.7 MB
  • After minification 10.6 MB

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. Cardiacscience images are well optimized though.

JavaScript Optimization

-36%

Potential reduce by 93.3 kB

  • Original 259.6 kB
  • After minification 259.6 kB
  • After compression 166.3 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 93.3 kB or 36% of the original size.

CSS Optimization

-12%

Potential reduce by 5.1 kB

  • Original 43.3 kB
  • After minification 43.3 kB
  • After compression 38.2 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. Cardiacscience.com needs all CSS files to be minified and compressed as it can save up to 5.1 kB or 12% of the original size.

Requests Breakdown

Number of requests can be reduced by 30 (29%)

Requests Now

104

After Optimization

74

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 104 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Cardiacscience. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 20 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

aeds-for-public-access

aeds-for-public-access

528 ms

Bootstrap.js

Bootstrap.js

80 ms

0552c7d7-62e0-4163-900d-2374c78f3501.css

0552c7d7-62e0-4163-900d-2374c78f3501.css

52 ms

css

css

52 ms

slick.css

slick.css

40 ms

jquery-ui.css

jquery-ui.css

33 ms

main.css

main.css

66 ms

webopt.css

webopt.css

94 ms

built.js

built.js

78 ms

jquery-ui.js

jquery-ui.js

43 ms

slick.min.js

slick.min.js

61 ms

locale-switcher.css

locale-switcher.css

103 ms

ddslick.min.js

ddslick.min.js

92 ms

locale-switcher.js

locale-switcher.js

97 ms

gtm.js

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bat.js

bat.js

403 ms

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852 ms

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981 ms

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853 ms

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Accessibility Review

cardiacscience.com accessibility score

87

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

Links do not have a discernible name

Tables and lists

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Impact

Issue

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

Best Practices

cardiacscience.com 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

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

cardiacscience.com SEO score

86

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

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

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 Cardiacscience.com 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 Cardiacscience.com 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

cardiacscience.com

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