Tools & Wizards About Us
dhvi.duke.edu screenshot

Report Summary

  • 9

    Performance

    Renders faster than
    23% of other websites

  • 93

    Accessibility

    Visual factors better than
    that of 80% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 86

    SEO

    Google-friendlier than
    60% of websites

dhvi.duke.edu

Home | Duke Human Vaccine Institute

Page Load Speed

5.1 sec in total

First Response

188 ms

Resources Loaded

4.4 sec

Page Rendered

561 ms

dhvi.duke.edu screenshot

About Website

Visit dhvi.duke.edu now to see the best up-to-date Dhvi Duke content for United States and also check out these interesting facts you probably never knew about dhvi.duke.edu

Visit dhvi.duke.edu

Key Findings

We analyzed Dhvi.duke.edu page load time and found that the first response time was 188 ms and then it took 4.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 75% of websites can load faster.

Performance Metrics

dhvi.duke.edu performance score

9

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value8.9 s

0/100

10%

LCP (Largest Contentful Paint)

Value13.0 s

0/100

25%

SI (Speed Index)

Value20.3 s

0/100

10%

TBT (Total Blocking Time)

Value8,860 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.212

59/100

15%

TTI (Time to Interactive)

Value32.1 s

0/100

10%

Network Requests Diagram

dhvi.duke.edu

188 ms

google_tag.script.js

33 ms

ajax-progress.module.css

63 ms

align.module.css

99 ms

autocomplete-loading.module.css

99 ms

Our browser made a total of 98 requests to load all elements on the main page. We found that 68% of them (67 requests) were addressed to the original Dhvi.duke.edu, 9% (9 requests) were made to Youtube.com and 6% (6 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (2.5 sec) belongs to the original domain Dhvi.duke.edu.

Page Optimization Overview & Recommendations

Page size can be reduced by 518.2 kB (14%)

Content Size

3.7 MB

After Optimization

3.1 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Dhvi.duke.edu main page is 3.7 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. 70% of websites need less resources to load. Images take 2.9 MB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 46.1 kB

  • Original 56.3 kB
  • After minification 48.6 kB
  • After compression 10.2 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 7.7 kB, which is 14% 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 46.1 kB or 82% of the original size.

Image Optimization

-7%

Potential reduce by 195.2 kB

  • Original 2.9 MB
  • After minification 2.7 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. Dhvi Duke images are well optimized though.

JavaScript Optimization

-1%

Potential reduce by 3.5 kB

  • Original 271.9 kB
  • After minification 271.8 kB
  • After compression 268.4 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

-66%

Potential reduce by 273.4 kB

  • Original 411.5 kB
  • After minification 410.1 kB
  • After compression 138.1 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. Dhvi.duke.edu needs all CSS files to be minified and compressed as it can save up to 273.4 kB or 66% of the original size.

Requests Breakdown

Number of requests can be reduced by 57 (64%)

Requests Now

89

After Optimization

32

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 89 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dhvi Duke. 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 39 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

dhvi.duke.edu

dhvi.duke.edu

188 ms

google_tag.script.js

google_tag.script.js

33 ms

ajax-progress.module.css

ajax-progress.module.css

63 ms

align.module.css

align.module.css

99 ms

autocomplete-loading.module.css

autocomplete-loading.module.css

99 ms

fieldgroup.module.css

fieldgroup.module.css

99 ms

container-inline.module.css

container-inline.module.css

98 ms

clearfix.module.css

clearfix.module.css

286 ms

details.module.css

details.module.css

286 ms

hidden.module.css

hidden.module.css

124 ms

item-list.module.css

item-list.module.css

124 ms

js.module.css

js.module.css

124 ms

nowrap.module.css

nowrap.module.css

186 ms

position-container.module.css

position-container.module.css

185 ms

progress.module.css

progress.module.css

186 ms

reset-appearance.module.css

reset-appearance.module.css

186 ms

resize.module.css

resize.module.css

211 ms

sticky-header.module.css

sticky-header.module.css

384 ms

system-status-counter.css

system-status-counter.css

285 ms

system-status-report-counters.css

system-status-report-counters.css

485 ms

system-status-report-general-info.css

system-status-report-general-info.css

238 ms

tabledrag.module.css

tabledrag.module.css

486 ms

tablesort.module.css

tablesort.module.css

484 ms

tree-child.module.css

tree-child.module.css

384 ms

views.module.css

views.module.css

310 ms

oembed.formatter.css

oembed.formatter.css

483 ms

filter.caption.css

filter.caption.css

485 ms

filter.caption.css

filter.caption.css

483 ms

addtoany.css

addtoany.css

683 ms

paragraphs.unpublished.css

paragraphs.unpublished.css

582 ms

node.css

node.css

582 ms

mb.YTPlayer.min.css

mb.YTPlayer.min.css

583 ms

breadcrumb.css

breadcrumb.css

584 ms

bootstrap.min.css

bootstrap.min.css

33 ms

all.css

all.css

42 ms

messages-light.css

messages-light.css

781 ms

style.css

style.css

2486 ms

alert.css

alert.css

176 ms

alert.html

alert.html

179 ms

jquery.min.js

jquery.min.js

1202 ms

page.js

page.js

61 ms

bootstrap.bundle.min.js

bootstrap.bundle.min.js

43 ms

drupalSettingsLoader.js

drupalSettingsLoader.js

605 ms

drupal.js

drupal.js

584 ms

drupal.init.js

drupal.init.js

624 ms

addtoany.js

addtoany.js

588 ms

popper.min.js

popper.min.js

989 ms

bootstrap.min.js

bootstrap.min.js

888 ms

global.js

global.js

787 ms

mb.YTPlayer.min.js

mb.YTPlayer.min.js

1163 ms

youtube.js

youtube.js

1062 ms

css2

css2

38 ms

dhvi-logo-white.svg

dhvi-logo-white.svg

184 ms

postdoccareerbanner189in.png

postdoccareerbanner189in.png

1426 ms

programsandcentersgraphic.png

programsandcentersgraphic.png

135 ms

makeadifferencegraphic.png

makeadifferencegraphic.png

200 ms

opportunityawaitsgraphic.png

opportunityawaitsgraphic.png

231 ms

Bart%20Haynes%20USE.jpg

Bart%20Haynes%20USE.jpg

183 ms

faucinewsphoto.jpg

faucinewsphoto.jpg

345 ms

kshitijwaghphoto.jpg

kshitijwaghphoto.jpg

268 ms

danielwrapp-cropped2.png

danielwrapp-cropped2.png

340 ms

ln2-freezers-accessioningunit-freezerfarm.png

ln2-freezers-accessioningunit-freezerfarm.png

508 ms

dhvi-logo-blue.svg

dhvi-logo-blue.svg

444 ms

pattern-dark.png

pattern-dark.png

429 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0C4n.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0C4n.ttf

118 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0C4n.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0C4n.ttf

119 ms

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsgH1y4n.ttf

memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsgH1y4n.ttf

182 ms

oembed

oembed

460 ms

oembed

oembed

457 ms

oembed

oembed

889 ms

oembed

oembed

563 ms

oembed

oembed

890 ms

fb-icon.svg

fb-icon.svg

477 ms

twitter-icon.svg

twitter-icon.svg

607 ms

instagram-icon.svg

instagram-icon.svg

608 ms

linkedin-icon.svg

linkedin-icon.svg

608 ms

fa-solid-900.woff

fa-solid-900.woff

84 ms

fa-regular-400.woff

fa-regular-400.woff

130 ms

gtm.js

gtm.js

115 ms

memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0Rk8ZkaVc.ttf

memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0Rk8ZkaVc.ttf

79 ms

sm.25.html

sm.25.html

59 ms

eso.D0Uc7kY6.js

eso.D0Uc7kY6.js

77 ms

oembed.frame.css

oembed.frame.css

337 ms

H_-ksKxCXKk

H_-ksKxCXKk

126 ms

kdgLGwd7Tr8

kdgLGwd7Tr8

495 ms

aL6FC3wBZ24

aL6FC3wBZ24

432 ms

www-player.css

www-player.css

5 ms

www-embed-player.js

www-embed-player.js

36 ms

base.js

base.js

65 ms

ad_status.js

ad_status.js

590 ms

Xal8RkuvyCiU6W_GOvwH_DuhE1BN-1S9Ky9af2kVVy4.js

Xal8RkuvyCiU6W_GOvwH_DuhE1BN-1S9Ky9af2kVVy4.js

539 ms

embed.js

embed.js

211 ms

E9gfeUV8YEM

E9gfeUV8YEM

372 ms

GezlHXfhCBA

GezlHXfhCBA

370 ms

id

id

279 ms

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

KFOlCnqEu92Fr1MmEU9fBBc9.ttf

231 ms

KFOmCnqEu92Fr1Mu4mxP.ttf

KFOmCnqEu92Fr1Mu4mxP.ttf

231 ms

id

id

85 ms

Accessibility Review

dhvi.duke.edu accessibility score

93

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

ARIA IDs are not unique

Best Practices

dhvi.duke.edu best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

dhvi.duke.edu 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

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

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Dhvi.duke.edu 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 Dhvi.duke.edu 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

dhvi.duke.edu

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