Report Summary

  • 35

    Performance

    Renders faster than
    55% of other websites

  • 98

    Accessibility

    Visual factors better than
    that of 96% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    86% of websites

  • 91

    SEO

    Google-friendlier than
    76% of websites

duke.edu

Duke University

Page Load Speed

1.3 sec in total

First Response

57 ms

Resources Loaded

764 ms

Page Rendered

507 ms

duke.edu screenshot

About Website

Click here to check amazing Duke content for United States. Otherwise, check out these important facts you probably never knew about duke.edu

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Key Findings

We analyzed Duke.edu page load time and found that the first response time was 57 ms and then it took 1.3 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 20% of websites can load faster.

Performance Metrics

duke.edu performance score

35

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.3 s

74/100

10%

LCP (Largest Contentful Paint)

Value9.1 s

1/100

25%

SI (Speed Index)

Value5.3 s

57/100

10%

TBT (Total Blocking Time)

Value1,610 ms

12/100

30%

CLS (Cumulative Layout Shift)

Value0.066

97/100

15%

TTI (Time to Interactive)

Value9.0 s

34/100

10%

Network Requests Diagram

duke.edu

57 ms

duke.edu

156 ms

duke.js

63 ms

mqdefault.jpg

109 ms

12751143_1731662890398390_88949705_n.jpg

218 ms

Our browser made a total of 37 requests to load all elements on the main page. We found that 70% of them (26 requests) were addressed to the original Duke.edu, 11% (4 requests) were made to I1.ytimg.com and 11% (4 requests) were made to Scontent.cdninstagram.com. The less responsive or slowest element that took the longest time to load (459 ms) belongs to the original domain Duke.edu.

Page Optimization Overview & Recommendations

Page size can be reduced by 763.2 kB (22%)

Content Size

3.5 MB

After Optimization

2.7 MB

In fact, the total size of Duke.edu main page is 3.5 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. 30% of websites need less resources to load. Images take 2.5 MB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 99.0 kB

  • Original 123.0 kB
  • After minification 111.7 kB
  • After compression 23.9 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 99.0 kB or 81% of the original size.

Image Optimization

-2%

Potential reduce by 58.4 kB

  • Original 2.5 MB
  • After minification 2.4 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. Duke images are well optimized though.

JavaScript Optimization

-75%

Potential reduce by 464.7 kB

  • Original 623.0 kB
  • After minification 623.0 kB
  • After compression 158.3 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 464.7 kB or 75% of the original size.

CSS Optimization

-53%

Potential reduce by 141.1 kB

  • Original 267.6 kB
  • After minification 266.5 kB
  • After compression 126.5 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. Duke.edu needs all CSS files to be minified and compressed as it can save up to 141.1 kB or 53% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

35

After Optimization

35

The browser has sent 35 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Duke. According to our analytics all requests are already optimized.

Accessibility Review

duke.edu accessibility score

98

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

Links do not have a discernible name

Best Practices

duke.edu best practices score

92

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

Missing source maps for large first-party JavaScript

SEO Factors

duke.edu SEO score

91

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 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 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

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