8.6 sec in total
49 ms
5 sec
3.5 sec
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Visit coursera.r7.comWe analyzed Coursera.r7.com page load time and found that the first response time was 49 ms and then it took 8.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 85% of websites can load faster.
coursera.r7.com performance score
name
value
score
weighting
Value4.0 s
22/100
10%
Value9.3 s
1/100
25%
Value19.3 s
0/100
10%
Value11,690 ms
0/100
30%
Value0.019
100/100
15%
Value47.1 s
0/100
10%
49 ms
11 ms
171 ms
187 ms
537 ms
Our browser made a total of 308 requests to load all elements on the main page. We found that 0% of them (1 request) were addressed to the original Coursera.r7.com, 69% (212 requests) were made to Img.r7.com and 18% (56 requests) were made to Assets.r7.com. The less responsive or slowest element that took the longest time to load (1.7 sec) relates to the external source Img.r7.com.
Page size can be reduced by 1.7 MB (38%)
4.5 MB
2.8 MB
In fact, the total size of Coursera.r7.com main page is 4.5 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. 85% 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. Images take 2.3 MB which makes up the majority of the site volume.
Potential reduce by 1.2 MB
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. This page needs HTML code to be minified as it can gain 165.4 kB, which is 12% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 1.2 MB or 86% of the original size.
Potential reduce by 749 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. Coursera R7 images are well optimized though.
Potential reduce by 350.5 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 350.5 kB or 61% of the original size.
Potential reduce by 153.6 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. Coursera.r7.com needs all CSS files to be minified and compressed as it can save up to 153.6 kB or 64% of the original size.
Number of requests can be reduced by 83 (27%)
304
221
The browser has sent 304 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Coursera R7. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 45 to 1 for JavaScripts and from 40 to 1 for CSS and as a result speed up the page load time.
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coursera.r7.com accessibility score
ARIA
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
Impact
Issue
Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.
[role]s are not contained by their required parent element
[aria-*] attributes do not have valid values
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
<frame> or <iframe> elements do not have a title
Image elements do not have [alt] attributes
Links do not have a discernible name
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
Heading elements are not in a sequentially-descending order
Tables and lists
These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Impact
Issue
Lists do not contain only <li> elements and script supporting elements (<script> and <template>).
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.
coursera.r7.com best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Displays images with incorrect aspect ratio
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
Missing source maps for large first-party JavaScript
coursera.r7.com SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
Links are not crawlable
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
Image elements do not have [alt] attributes
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
Tap targets are not sized appropriately
PT
N/A
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Coursera.r7.com can be misinterpreted by Google and other search engines. Our service has detected that Portuguese 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 Coursera.r7.com 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.
coursera.r7.com
Open Graph data is detected on the main page of Coursera R7. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: