Report Summary

  • 31

    Performance

    Renders faster than
    51% of other websites

  • 93

    Accessibility

    Visual factors better than
    that of 82% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 76

    SEO

    Google-friendlier than
    35% of websites

library.yale.edu

Homepage | Yale Library

Page Load Speed

830 ms in total

First Response

50 ms

Resources Loaded

654 ms

Page Rendered

126 ms

library.yale.edu screenshot

About Website

Click here to check amazing Library Yale content for United States. Otherwise, check out these important facts you probably never knew about library.yale.edu

Get to know the helpful people, explore the unique collections, and see the amazing spaces of the Yale University Library system.

Visit library.yale.edu

Key Findings

We analyzed Library.yale.edu page load time and found that the first response time was 50 ms and then it took 780 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.yale.edu performance score

31

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.5 s

35/100

10%

LCP (Largest Contentful Paint)

Value14.2 s

0/100

25%

SI (Speed Index)

Value4.3 s

76/100

10%

TBT (Total Blocking Time)

Value1,130 ms

22/100

30%

CLS (Cumulative Layout Shift)

Value0.141

78/100

15%

TTI (Time to Interactive)

Value12.0 s

16/100

10%

Network Requests Diagram

library.yale.edu

50 ms

web.library.yale.edu

84 ms

css_kShW4RPmRstZ3SpIC-ZvVGNFVAi0WEMuCnI0ZkYIaFw.css

20 ms

css_hTLrwzbU9bZhjvzx-j5entbJFEHkjJyd6RgHEla8FhA.css

34 ms

css_IXy4f8xJPrOoW9nMqIML83f0gCGm-ilS3juJoCWgzwE.css

30 ms

Our browser made a total of 42 requests to load all elements on the main page. We found that 2% of them (1 request) were addressed to the original Library.yale.edu, 64% (27 requests) were made to Web.library.yale.edu and 10% (4 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (124 ms) relates to the external source Google-analytics.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 597.9 kB (60%)

Content Size

1.0 MB

After Optimization

403.8 kB

In fact, the total size of Library.yale.edu main page is 1.0 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. 45% of websites need less resources to load. Javascripts take 527.1 kB which makes up the majority of the site volume.

HTML Optimization

-73%

Potential reduce by 74.8 kB

  • Original 103.1 kB
  • After minification 100.7 kB
  • After compression 28.3 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. 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 74.8 kB or 73% of the original size.

Image Optimization

-12%

Potential reduce by 21.8 kB

  • Original 180.6 kB
  • After minification 158.8 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, Library Yale needs image optimization as it can save up to 21.8 kB or 12% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-65%

Potential reduce by 344.7 kB

  • Original 527.1 kB
  • After minification 500.0 kB
  • After compression 182.4 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. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 344.7 kB or 65% of the original size.

CSS Optimization

-82%

Potential reduce by 156.7 kB

  • Original 190.9 kB
  • After minification 187.4 kB
  • After compression 34.2 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.yale.edu needs all CSS files to be minified and compressed as it can save up to 156.7 kB or 82% of the original size.

Requests Breakdown

Number of requests can be reduced by 29 (78%)

Requests Now

37

After Optimization

8

The browser has sent 37 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Library Yale. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 15 to 1 for JavaScripts and from 8 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

library.yale.edu accessibility score

93

Accessibility Issues

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

Buttons do not have an accessible name

Best Practices

library.yale.edu 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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

library.yale.edu SEO score

76

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

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.yale.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.yale.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

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