2.8 sec in total
430 ms
1.9 sec
428 ms
Welcome to collegeopentextbooks.org homepage info - get ready to check College Open Textbooks best content for United States right away, or after learning these important things about collegeopentextbooks.org
Funded by The William and Flora Hewlett Foundation, College Open Textbooks is a collection of colleges, governmental agencies, education non-profits, and other education-related organizations that are...
Visit collegeopentextbooks.orgWe analyzed Collegeopentextbooks.org page load time and found that the first response time was 430 ms and then it took 2.3 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 45% of websites can load faster.
collegeopentextbooks.org performance score
name
value
score
weighting
Value3.0 s
50/100
10%
Value6.4 s
9/100
25%
Value9.0 s
14/100
10%
Value910 ms
31/100
30%
Value0
100/100
15%
Value10.3 s
24/100
10%
430 ms
70 ms
135 ms
136 ms
137 ms
Our browser made a total of 56 requests to load all elements on the main page. We found that 96% of them (54 requests) were addressed to the original Collegeopentextbooks.org, 4% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (1.1 sec) belongs to the original domain Collegeopentextbooks.org.
Page size can be reduced by 423.5 kB (23%)
1.8 MB
1.4 MB
In fact, the total size of Collegeopentextbooks.org main page is 1.8 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. 35% of websites need less resources to load. Images take 1.4 MB which makes up the majority of the site volume.
Potential reduce by 19.7 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 19.7 kB or 76% of the original size.
Potential reduce by 142.3 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. College Open Textbooks images are well optimized though.
Potential reduce by 201.9 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 201.9 kB or 66% of the original size.
Potential reduce by 59.6 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. Collegeopentextbooks.org needs all CSS files to be minified and compressed as it can save up to 59.6 kB or 85% of the original size.
Number of requests can be reduced by 30 (56%)
54
24
The browser has sent 54 CSS, Javascripts, AJAX and image requests in order to completely render the main page of College Open Textbooks. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 10 to 1 for JavaScripts and from 8 to 1 for CSS and as a result speed up the page load time.
collegeopentextbooks.org
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collegeopentextbooks.org 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
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
collegeopentextbooks.org best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
collegeopentextbooks.org SEO score
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
EN
EN
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Collegeopentextbooks.org 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 Collegeopentextbooks.org 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.
collegeopentextbooks.org
Open Graph description is not detected on the main page of College Open Textbooks. 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: