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worlddigitallibrary.org screenshot

Report Summary

  • 36

    Performance

    Renders faster than
    55% of other websites

  • 98

    Accessibility

    Visual factors better than
    that of 94% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 96

    SEO

    Google-friendlier than
    90% of websites

worlddigitallibrary.org

About this Collection  |  World Digital Library  |  Digital Collections  |  Library of Congress

Page Load Speed

867 ms in total

First Response

17 ms

Resources Loaded

485 ms

Page Rendered

365 ms

worlddigitallibrary.org screenshot

About Website

Visit worlddigitallibrary.org now to see the best up-to-date World Digital Library content and also check out these interesting facts you probably never knew about worlddigitallibrary.org

This collection contains cultural heritage materials gathered during the World Digital Library (WDL) project, including thousands of items contributed by partner organizations worldwide as well as con...

Visit worlddigitallibrary.org

Key Findings

We analyzed Worlddigitallibrary.org page load time and found that the first response time was 17 ms and then it took 850 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

worlddigitallibrary.org performance score

36

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value7.1 s

1/100

10%

LCP (Largest Contentful Paint)

Value26.7 s

0/100

25%

SI (Speed Index)

Value13.3 s

2/100

10%

TBT (Total Blocking Time)

Value370 ms

70/100

30%

CLS (Cumulative Layout Shift)

Value0.001

100/100

15%

TTI (Time to Interactive)

Value26.7 s

0/100

10%

Network Requests Diagram

worlddigitallibrary.org

17 ms

55 ms

57 ms

base.css

24 ms

satelliteLib-6b47f831c184878d7338d4683ecf773a17973bb9.js

16 ms

Our browser made a total of 38 requests to load all elements on the main page. We found that 3% of them (1 request) were addressed to the original Worlddigitallibrary.org, 58% (22 requests) were made to Loc.gov and 18% (7 requests) were made to F1-na.readspeaker.com. The less responsive or slowest element that took the longest time to load (191 ms) relates to the external source Loc.gov.

Page Optimization Overview & Recommendations

Page size can be reduced by 3.2 MB (77%)

Content Size

4.2 MB

After Optimization

973.9 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Worlddigitallibrary.org main page is 4.2 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. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Javascripts take 3.6 MB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 116.5 kB

  • Original 143.5 kB
  • After minification 129.4 kB
  • After compression 27.0 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 116.5 kB or 81% of the original size.

Image Optimization

-13%

Potential reduce by 5.1 kB

  • Original 39.8 kB
  • After minification 34.7 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. Obviously, World Digital Library needs image optimization as it can save up to 5.1 kB or 13% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-76%

Potential reduce by 2.7 MB

  • Original 3.6 MB
  • After minification 3.5 MB
  • After compression 863.7 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 2.7 MB or 76% of the original size.

CSS Optimization

-88%

Potential reduce by 350.4 kB

  • Original 398.9 kB
  • After minification 314.0 kB
  • After compression 48.5 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. Worlddigitallibrary.org needs all CSS files to be minified and compressed as it can save up to 350.4 kB or 88% of the original size.

Requests Breakdown

Number of requests can be reduced by 11 (37%)

Requests Now

30

After Optimization

19

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 30 CSS, Javascripts, AJAX and image requests in order to completely render the main page of World Digital Library. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

worlddigitallibrary.org

worlddigitallibrary.org

17 ms

55 ms

57 ms

base.css

base.css

24 ms

satelliteLib-6b47f831c184878d7338d4683ecf773a17973bb9.js

satelliteLib-6b47f831c184878d7338d4683ecf773a17973bb9.js

16 ms

jquery-1.8.2.js

jquery-1.8.2.js

61 ms

ReadSpeaker.js

ReadSpeaker.js

150 ms

ReadSpeaker.Custom.js

ReadSpeaker.Custom.js

96 ms

base.js

base.js

101 ms

id

id

57 ms

AppMeasurement.min.js

AppMeasurement.min.js

44 ms

AppMeasurement_Module_ActivityMap.min.js

AppMeasurement_Module_ActivityMap.min.js

47 ms

logo-loc-new-branding.svg

logo-loc-new-branding.svg

41 ms

facebook.svg

facebook.svg

39 ms

twitter.svg

twitter.svg

38 ms

link.svg

link.svg

44 ms

email.svg

email.svg

43 ms

youtube.svg

youtube.svg

54 ms

pinterest.svg

pinterest.svg

183 ms

flickr.svg

flickr.svg

177 ms

instagram.svg

instagram.svg

179 ms

itunesU.svg

itunesU.svg

184 ms

congress-gov.svg

congress-gov.svg

188 ms

copyright-gov.svg

copyright-gov.svg

191 ms

OpenSans-Regular.woff

OpenSans-Regular.woff

190 ms

OpenSans-Bold.woff

OpenSans-Bold.woff

191 ms

dest5.html

dest5.html

20 ms

id

id

29 ms

ReadSpeaker.Styles.css

ReadSpeaker.Styles.css

2 ms

ReadSpeaker.Core.js

ReadSpeaker.Core.js

121 ms

ReadSpeaker.pub.Config.js

ReadSpeaker.pub.Config.js

121 ms

rs_button.png

rs_button.png

28 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

38 ms

RobotoSlab-Bold.woff

RobotoSlab-Bold.woff

44 ms

RobotoSlab-Regular.woff

RobotoSlab-Regular.woff

77 ms

ReadSpeaker.lib.Facade.adapter.jquery.js

ReadSpeaker.lib.Facade.adapter.jquery.js

10 ms

ibs:dpid=411&dpuuid=ZtFbpwAAAJkE_wN-

ibs:dpid=411&dpuuid=ZtFbpwAAAJkE_wN-

11 ms

ReadSpeaker.Base.js

ReadSpeaker.Base.js

7 ms

Accessibility Review

worlddigitallibrary.org accessibility score

98

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.

Best Practices

worlddigitallibrary.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

High

Missing source maps for large first-party JavaScript

SEO Factors

worlddigitallibrary.org SEO score

96

Search Engine Optimization Advices

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 Worlddigitallibrary.org 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 Worlddigitallibrary.org 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

worlddigitallibrary.org

Open Graph data is detected on the main page of World Digital Library. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: