Tools & Wizards About Us
lifevest.zoll.com screenshot

Report Summary

  • 19

    Performance

    Renders faster than
    36% of other websites

  • 96

    Accessibility

    Visual factors better than
    that of 88% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 85

    SEO

    Google-friendlier than
    55% of websites

lifevest.zoll.com

ZOLL LifeVest Wearable Defibrillator | ZOLL Medical Corporation

Page Load Speed

1.7 sec in total

First Response

93 ms

Resources Loaded

1.4 sec

Page Rendered

253 ms

lifevest.zoll.com screenshot

About Website

Click here to check amazing Life Vest ZOLL content for United States. Otherwise, check out these important facts you probably never knew about lifevest.zoll.com

LifeVest® is a proven therapy for patients at risk of sudden cardiac death, allowing patients to return to most of their daily activities with peace of mind that they have protection.

Visit lifevest.zoll.com

Key Findings

We analyzed Lifevest.zoll.com page load time and found that the first response time was 93 ms and then it took 1.6 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.

Performance Metrics

lifevest.zoll.com performance score

19

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value4.2 s

19/100

10%

LCP (Largest Contentful Paint)

Value15.1 s

0/100

25%

SI (Speed Index)

Value5.6 s

52/100

10%

TBT (Total Blocking Time)

Value950 ms

29/100

30%

CLS (Cumulative Layout Shift)

Value0.546

13/100

15%

TTI (Time to Interactive)

Value11.8 s

17/100

10%

Network Requests Diagram

lifevest.zoll.com

93 ms

lifevest.zoll.com

337 ms

Bootstrap.js

61 ms

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

74 ms

css

59 ms

Our browser made a total of 39 requests to load all elements on the main page. We found that 51% of them (20 requests) were addressed to the original Lifevest.zoll.com, 13% (5 requests) were made to Fonts.gstatic.com and 5% (2 requests) were made to Fast.fonts.net. The less responsive or slowest element that took the longest time to load (337 ms) belongs to the original domain Lifevest.zoll.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 67.7 kB (2%)

Content Size

2.7 MB

After Optimization

2.7 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Lifevest.zoll.com main page is 2.7 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. 65% of websites need less resources to load. Images take 2.6 MB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 30.7 kB

  • Original 37.0 kB
  • After minification 26.2 kB
  • After compression 6.3 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. This page needs HTML code to be minified as it can gain 10.8 kB, which is 29% 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 30.7 kB or 83% of the original size.

Image Optimization

-0%

Potential reduce by 1.2 kB

  • Original 2.6 MB
  • After minification 2.6 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. Life Vest ZOLL images are well optimized though.

JavaScript Optimization

-28%

Potential reduce by 35.0 kB

  • Original 126.8 kB
  • After minification 126.8 kB
  • After compression 91.8 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 35.0 kB or 28% of the original size.

CSS Optimization

-5%

Potential reduce by 810 B

  • Original 15.9 kB
  • After minification 15.9 kB
  • After compression 15.1 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. Lifevest.zoll.com has all CSS files already compressed.

Requests Breakdown

Number of requests can be reduced by 16 (53%)

Requests Now

30

After Optimization

14

  • Images
  • JavaScript
  • CSS

The browser has sent 30 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Life Vest ZOLL. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

lifevest.zoll.com

lifevest.zoll.com

93 ms

lifevest.zoll.com

lifevest.zoll.com

337 ms

Bootstrap.js

Bootstrap.js

61 ms

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

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

74 ms

css

css

59 ms

main.css

main.css

46 ms

site-nav-alt-4.css

site-nav-alt-4.css

74 ms

lifevest.css

lifevest.css

43 ms

jquery.fancybox.min.css

jquery.fancybox.min.css

43 ms

built.js

built.js

84 ms

email-decode.min.js

email-decode.min.js

40 ms

jquery-ui.js

jquery-ui.js

69 ms

owl.carousel.min.js

owl.carousel.min.js

69 ms

modules-main.js

modules-main.js

180 ms

jquery.fancybox.min.js

jquery.fancybox.min.js

44 ms

pa-5c45cf089a3f830016000433.js

pa-5c45cf089a3f830016000433.js

69 ms

gtm.js

gtm.js

164 ms

zoll-lifevest-logo.ashx

zoll-lifevest-logo.ashx

177 ms

us_patients_tile.ashx

us_patients_tile.ashx

179 ms

us_mp_tile.ashx

us_mp_tile.ashx

178 ms

us_careers_tile.ashx

us_careers_tile.ashx

177 ms

thin-divider.ashx

thin-divider.ashx

176 ms

lv-home-phone.ashx

lv-home-phone.ashx

176 ms

thin-divider.ashx

thin-divider.ashx

233 ms

lv-home-fax.ashx

lv-home-fax.ashx

233 ms

lv-home-mouse.ashx

lv-home-mouse.ashx

233 ms

zoll-logo-white-png.ashx

zoll-logo-white-png.ashx

232 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0C4k.woff

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0C4k.woff

178 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0C4k.woff

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0C4k.woff

233 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsgH1y4k.woff

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsgH1y4k.woff

290 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1y4k.woff

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1y4k.woff

291 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgshZ1y4k.woff

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgshZ1y4k.woff

296 ms

insight.min.js

insight.min.js

258 ms

video-js.min.css

video-js.min.css

182 ms

video.min.js

video.min.js

209 ms

bc017822-de5a-4b1a-8eed-ed8e06fec708.woff

bc017822-de5a-4b1a-8eed-ed8e06fec708.woff

179 ms

us_hero_family.ashx

us_hero_family.ashx

198 ms

icomoon.woff

icomoon.woff

70 ms

insight_tag_errors.gif

insight_tag_errors.gif

134 ms

Accessibility Review

lifevest.zoll.com accessibility score

96

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

Links do not have a discernible name

Best Practices

lifevest.zoll.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

lifevest.zoll.com SEO score

85

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

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

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Lifevest.zoll.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 Lifevest.zoll.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

lifevest.zoll.com

Open Graph description is not detected on the main page of Life Vest ZOLL. 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: