410 ms in total
30 ms
264 ms
116 ms
Click here to check amazing Courses Harvard content for United States. Otherwise, check out these important facts you probably never knew about courses.harvard.edu
Visit courses.harvard.eduWe analyzed Courses.harvard.edu page load time and found that the first response time was 30 ms and then it took 380 ms to load all DOM resources and completely render a web page. This is an excellent result, as only 5% of websites can load faster.
courses.harvard.edu performance score
name
value
score
weighting
Value15.6 s
0/100
10%
Value21.1 s
0/100
25%
Value15.6 s
0/100
10%
Value470 ms
61/100
30%
Value0.45
20/100
15%
Value22.8 s
1/100
10%
30 ms
56 ms
15 ms
13 ms
13 ms
Our browser made a total of 22 requests to load all elements on the main page. We found that 86% of them (19 requests) were addressed to the original Courses.harvard.edu, 9% (2 requests) were made to Google-analytics.com and 5% (1 request) were made to . The less responsive or slowest element that took the longest time to load (61 ms) belongs to the original domain Courses.harvard.edu.
Page size can be reduced by 184.0 kB (66%)
277.7 kB
93.8 kB
In fact, the total size of Courses.harvard.edu main page is 277.7 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. 15% of websites need less resources to load. Javascripts take 144.8 kB which makes up the majority of the site volume.
Potential reduce by 7.7 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 7.7 kB or 62% of the original size.
Potential reduce by 318 B
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. Courses Harvard images are well optimized though.
Potential reduce by 82.2 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 82.2 kB or 57% of the original size.
Potential reduce by 93.8 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. Courses.harvard.edu needs all CSS files to be minified and compressed as it can save up to 93.8 kB or 84% of the original size.
Number of requests can be reduced by 10 (53%)
19
9
The browser has sent 19 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Courses Harvard. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and from 6 to 1 for CSS and as a result speed up the page load time.
courses.harvard.edu
30 ms
index.html
56 ms
jquery.min.js
15 ms
modernizr-1.1.min.js
13 ms
site.js
13 ms
superfish.css
34 ms
superfish-navbar.css
35 ms
hoverIntent.js
35 ms
superfish.js
44 ms
isites.css
49 ms
isites-core.css
42 ms
core.css
34 ms
course_catalog.css
54 ms
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3 ms
analytics.js
34 ms
harvard-logo.gif
23 ms
header-course-catalog.png
25 ms
searchInputBkg.jpg
22 ms
searchBkgIMG.jpg
23 ms
searchBkgIMG_over.jpg
60 ms
btnStartOverHover.jpg
61 ms
collect
14 ms
courses.harvard.edu accessibility score
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
Buttons do not have an accessible name
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
Heading elements are not in a sequentially-descending order
Best practices
These items highlight common accessibility best practices.
Impact
Issue
[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.
courses.harvard.edu best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Browser errors were logged to the console
courses.harvard.edu SEO score
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
Links do not have descriptive text
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
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
Document uses legible font sizes
N/A
N/A
ISO-8859-1
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Courses.harvard.edu can be misinterpreted by Google and other search engines. Unfortunately we cannot identify language used on the page (probably there is a mix of languages, too little text or something else) and no language is claimed in <html> or <meta> tags either. Our system also found out that Courses.harvard.edu main page’s claimed encoding is iso-8859-1. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.
courses.harvard.edu
Open Graph description is not detected on the main page of Courses Harvard. 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: