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authorities.loc.gov screenshot

Report Summary

  • 88

    Performance

    Renders faster than
    90% of other websites

  • 93

    Accessibility

    Visual factors better than
    that of 80% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 69

    SEO

    Google-friendlier than
    28% of websites

authorities.loc.gov

Library of Congress Authorities (Search for Name, Subject, Title and Name/Title)

Page Load Speed

254 ms in total

First Response

31 ms

Resources Loaded

151 ms

Page Rendered

72 ms

authorities.loc.gov screenshot

About Website

Welcome to authorities.loc.gov homepage info - get ready to check Authorities Loc best content for United States right away, or after learning these important things about authorities.loc.gov

The Library of Congress Authority file includes subject, name, title and name/title authority records created by or for the Library of Congress.

Visit authorities.loc.gov

Key Findings

We analyzed Authorities.loc.gov page load time and found that the first response time was 31 ms and then it took 223 ms to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster.

Performance Metrics

authorities.loc.gov performance score

88

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.4 s

69/100

10%

LCP (Largest Contentful Paint)

Value3.2 s

72/100

25%

SI (Speed Index)

Value2.4 s

98/100

10%

TBT (Total Blocking Time)

Value140 ms

95/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value3.2 s

95/100

10%

Network Requests Diagram

authorities.loc.gov

31 ms

opac-auth.css

6 ms

satelliteLib-6b47f831c184878d7338d4683ecf773a17973bb9.js

16 ms

id

17 ms

AppMeasurement.min.js

8 ms

Our browser made a total of 12 requests to load all elements on the main page. We found that 42% of them (5 requests) were addressed to the original Authorities.loc.gov, 25% (3 requests) were made to Assets.adobedtm.com and 17% (2 requests) were made to Dpm.demdex.net. The less responsive or slowest element that took the longest time to load (41 ms) relates to the external source Smon.loc.gov.

Page Optimization Overview & Recommendations

Page size can be reduced by 27.4 kB (21%)

Content Size

129.5 kB

After Optimization

102.1 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Authorities.loc.gov main page is 129.5 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. Only 10% of websites need less resources to load. Javascripts take 103.2 kB which makes up the majority of the site volume.

HTML Optimization

-65%

Potential reduce by 4.0 kB

  • Original 6.2 kB
  • After minification 5.6 kB
  • After compression 2.2 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. 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 4.0 kB or 65% of the original size.

Image Optimization

-2%

Potential reduce by 316 B

  • Original 19.7 kB
  • After minification 19.4 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. Authorities Loc images are well optimized though.

JavaScript Optimization

-22%

Potential reduce by 23.0 kB

  • Original 103.2 kB
  • After minification 103.2 kB
  • After compression 80.2 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 23.0 kB or 22% of the original size.

CSS Optimization

-14%

Potential reduce by 45 B

  • Original 326 B
  • After minification 326 B
  • After compression 281 B

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. Authorities.loc.gov needs all CSS files to be minified and compressed as it can save up to 45 B or 14% of the original size.

Requests Breakdown

Number of requests can be reduced by 3 (27%)

Requests Now

11

After Optimization

8

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 11 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Authorities Loc. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

authorities.loc.gov

authorities.loc.gov

31 ms

opac-auth.css

opac-auth.css

6 ms

satelliteLib-6b47f831c184878d7338d4683ecf773a17973bb9.js

satelliteLib-6b47f831c184878d7338d4683ecf773a17973bb9.js

16 ms

id

id

17 ms

AppMeasurement.min.js

AppMeasurement.min.js

8 ms

AppMeasurement_Module_ActivityMap.min.js

AppMeasurement_Module_ActivityMap.min.js

9 ms

background.gif

background.gif

6 ms

redpanel.jpg

redpanel.jpg

16 ms

auth-title.gif

auth-title.gif

16 ms

dest5.html

dest5.html

24 ms

id

id

41 ms

ibs:dpid=411&dpuuid=ZkmyqwAAAF-4hwMv

ibs:dpid=411&dpuuid=ZkmyqwAAAF-4hwMv

4 ms

Accessibility Review

authorities.loc.gov accessibility score

93

Accessibility Issues

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

Best Practices

authorities.loc.gov 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

SEO Factors

authorities.loc.gov SEO score

69

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Page is blocked from indexing

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 Authorities.loc.gov 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 Authorities.loc.gov 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

authorities.loc.gov

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