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library.duke.edu screenshot

Report Summary

  • 44

    Performance

    Renders faster than
    63% of other websites

  • 100

    Accessibility

    Visual factors better than
    that of 97% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 82

    SEO

    Google-friendlier than
    44% of websites

library.duke.edu

Duke University Libraries | Duke University Libraries

Page Load Speed

962 ms in total

First Response

167 ms

Resources Loaded

616 ms

Page Rendered

179 ms

library.duke.edu screenshot

About Website

Welcome to library.duke.edu homepage info - get ready to check Library Duke best content for United States right away, or after learning these important things about library.duke.edu

Visit library.duke.edu

Key Findings

We analyzed Library.duke.edu page load time and found that the first response time was 167 ms and then it took 795 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.

Performance Metrics

library.duke.edu performance score

44

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.7 s

5/100

10%

LCP (Largest Contentful Paint)

Value10.1 s

0/100

25%

SI (Speed Index)

Value7.2 s

30/100

10%

TBT (Total Blocking Time)

Value270 ms

82/100

30%

CLS (Cumulative Layout Shift)

Value0.082

94/100

15%

TTI (Time to Interactive)

Value10.8 s

22/100

10%

Network Requests Diagram

library.duke.edu

167 ms

jquery.trln.autocomplete.js

74 ms

jquery.trln.autosuggest.js

54 ms

trln_init.js

40 ms

DUKE_autosuggest_home.css

40 ms

Our browser made a total of 77 requests to load all elements on the main page. We found that 22% of them (17 requests) were addressed to the original Library.duke.edu, 58% (45 requests) were made to Libcms.oit.duke.edu and 8% (6 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (199 ms) relates to the external source Blogs.library.duke.edu.

Page Optimization Overview & Recommendations

Page size can be reduced by 560.4 kB (60%)

Content Size

931.6 kB

After Optimization

371.2 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Library.duke.edu main page is 931.6 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. 40% of websites need less resources to load. CSS take 326.9 kB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 67.7 kB

  • Original 80.5 kB
  • After minification 73.7 kB
  • After compression 12.8 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. 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 67.7 kB or 84% of the original size.

Image Optimization

-7%

Potential reduce by 16.6 kB

  • Original 247.5 kB
  • After minification 230.9 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. Library Duke images are well optimized though.

JavaScript Optimization

-73%

Potential reduce by 203.0 kB

  • Original 276.8 kB
  • After minification 215.8 kB
  • After compression 73.8 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 203.0 kB or 73% of the original size.

CSS Optimization

-84%

Potential reduce by 273.2 kB

  • Original 326.9 kB
  • After minification 318.5 kB
  • After compression 53.7 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. Library.duke.edu needs all CSS files to be minified and compressed as it can save up to 273.2 kB or 84% of the original size.

Requests Breakdown

Number of requests can be reduced by 46 (61%)

Requests Now

76

After Optimization

30

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 76 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Library 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 34 to 1 for JavaScripts and from 8 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

library.duke.edu

library.duke.edu

167 ms

jquery.trln.autocomplete.js

jquery.trln.autocomplete.js

74 ms

jquery.trln.autosuggest.js

jquery.trln.autosuggest.js

54 ms

trln_init.js

trln_init.js

40 ms

DUKE_autosuggest_home.css

DUKE_autosuggest_home.css

40 ms

jquery.gritter.css

jquery.gritter.css

39 ms

jquery.gritter.min.js

jquery.gritter.min.js

49 ms

css_xE-rWrJf-fncB6ztZfd2huxqgxu4WO-qwma6Xer30m4.css

css_xE-rWrJf-fncB6ztZfd2huxqgxu4WO-qwma6Xer30m4.css

101 ms

css_aE6HmKcex--4gHeMkP4MUsGXdtR3PtbJ_uRF24-ev5U.css

css_aE6HmKcex--4gHeMkP4MUsGXdtR3PtbJ_uRF24-ev5U.css

105 ms

css_RyKEw8ebogxFgRsrNWP0khiyo7LVYRk8_1jyW0Qmdl4.css

css_RyKEw8ebogxFgRsrNWP0khiyo7LVYRk8_1jyW0Qmdl4.css

104 ms

css_4R-soHnWxCZPeWNsqlctEi1KhYbdiatD0PACPrM8ff4.css

css_4R-soHnWxCZPeWNsqlctEi1KhYbdiatD0PACPrM8ff4.css

116 ms

css_7QX0ofF3CfPhhm6-PW7UoPK3ORcEa8CUuqVeCQ03AtY.css

css_7QX0ofF3CfPhhm6-PW7UoPK3ORcEa8CUuqVeCQ03AtY.css

109 ms

jquery.min.js

jquery.min.js

35 ms

jquery.once.js

jquery.once.js

106 ms

drupal.js

drupal.js

143 ms

jquery.cookie.js

jquery.cookie.js

140 ms

jquery.colorbox-min.js

jquery.colorbox-min.js

141 ms

colorbox.js

colorbox.js

141 ms

colorbox_style.js

colorbox_style.js

142 ms

colorbox_load.js

colorbox_load.js

143 ms

colorbox_inline.js

colorbox_inline.js

144 ms

jcaption.js

jcaption.js

144 ms

themekey_redirect.js

themekey_redirect.js

145 ms

googleanalytics.js

googleanalytics.js

146 ms

jquery.formalize.js

jquery.formalize.js

146 ms

omega-mediaqueries.js

omega-mediaqueries.js

147 ms

jquery.rwdImageMaps.min.js

jquery.rwdImageMaps.min.js

148 ms

bootstrap.min.js

bootstrap.min.js

151 ms

init.js

init.js

149 ms

respond.min.js

respond.min.js

149 ms

megamenu_plugins.js

megamenu_plugins.js

149 ms

megamenu.js

megamenu.js

162 ms

js_injector_13.js

js_injector_13.js

164 ms

js_injector_20.js

js_injector_20.js

164 ms

js_injector_31.js

js_injector_31.js

177 ms

js_injector_32.js

js_injector_32.js

165 ms

js_injector_45.js

js_injector_45.js

176 ms

js_injector_47.js

js_injector_47.js

166 ms

js_injector_65.js

js_injector_65.js

175 ms

js_injector_91.js

js_injector_91.js

181 ms

js_injector_93.js

js_injector_93.js

187 ms

alert.html

alert.html

68 ms

analytics.js

analytics.js

21 ms

collect

collect

119 ms

collect

collect

112 ms

collect

collect

112 ms

collect

collect

113 ms

collect

collect

114 ms

library_logo_print.png

library_logo_print.png

101 ms

palfrey600x360-260x180.jpg

palfrey600x360-260x180.jpg

199 ms

80x15.png

80x15.png

178 ms

ripolinuns600x360-260x180.jpg

ripolinuns600x360-260x180.jpg

153 ms

classof2020book600x360-260x180.jpg

classof2020book600x360-260x180.jpg

157 ms

Women-at-Duke-Book-cover-260x180.jpg

Women-at-Duke-Book-cover-260x180.jpg

160 ms

women_filmmakers600x360-260x180.jpg

women_filmmakers600x360-260x180.jpg

143 ms

papyrus600x360-260x180.jpg

papyrus600x360-260x180.jpg

159 ms

bg-body-shadowBackground-1240.png

bg-body-shadowBackground-1240.png

65 ms

bg-header-dukeblend-960-180b.jpg

bg-header-dukeblend-960-180b.jpg

62 ms

glyphicons-halflings-white.png

glyphicons-halflings-white.png

63 ms

discovery_icons_sprite.png

discovery_icons_sprite.png

64 ms

dropdown-b.png

dropdown-b.png

61 ms

arrowdrop-green-padded-sm.png

arrowdrop-green-padded-sm.png

62 ms

library-background-blue.jpg

library-background-blue.jpg

77 ms

search-arrow-light-v2b.png

search-arrow-light-v2b.png

79 ms

striped-grey.png

striped-grey.png

79 ms

quick_nav_icon_sprite.png

quick_nav_icon_sprite.png

75 ms

footer_icon_sprite_2015.png

footer_icon_sprite_2015.png

78 ms

logo.png

logo.png

70 ms

find.jpg

find.jpg

68 ms

using-library-alumni.jpg

using-library-alumni.jpg

71 ms

research-student.jpg

research-student.jpg

68 ms

course-support.jpg

course-support.jpg

68 ms

libraries.jpg

libraries.jpg

68 ms

about.jpg

about.jpg

96 ms

devillogo-60pct-60.png

devillogo-60pct-60.png

98 ms

dukelogo_vert_60pct_140.png

dukelogo_vert_60pct_140.png

97 ms

css_2bMj_EayKQzvvtvPPwWhl9khtStacntuSBN0WbMJR30.css

css_2bMj_EayKQzvvtvPPwWhl9khtStacntuSBN0WbMJR30.css

24 ms

Accessibility Review

library.duke.edu accessibility score

100

Accessibility Issues

Best Practices

library.duke.edu best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

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

High

Missing source maps for large first-party JavaScript

SEO Factors

library.duke.edu SEO score

82

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

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

    EN

  • Encoding

    UTF-8

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

library.duke.edu

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