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cdn.kastatic.org

115 ms

Our browser made a total of 1 request to load all elements on the main page. We found that all of those requests were addressed to Cdn.kastatic.org and no external sources were called. The less responsive or slowest element that took the longest time to load (115 ms) belongs to the original domain Cdn.kastatic.org.

Content Size

2.1 MB

After Optimization

2.1 MB

In fact, the total size of Cdn.kastatic.org main page is 2.1 MB. This result falls within the top 5000 of lightweight and thus fast loading web pages. Only a small number of websites need less resources to load. Images take 2.0 MB which makes up the majority of the site volume.

HTML Optimization

-46%

Potential reduce by 212 B

Original 465 B
After minification 386 B
After compression 253 B

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 79 B, which is 17% 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 212 B or 46% of the original size.

Image Optimization

-0%

Potential reduce by 39 B

Original 2.0 MB
After minification 2.0 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. Cdn Kastatic images are well optimized though.

JavaScript Optimization

-1%

Potential reduce by 191 B

Original 21.9 kB
After minification 21.8 kB
After compression 21.7 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. This website has mostly compressed JavaScripts.

CSS Optimization

-19%

Potential reduce by 3.1 kB

Original 16.7 kB
After minification 16.7 kB
After compression 13.6 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. Cdn.kastatic.org needs all CSS files to be minified and compressed as it can save up to 3.1 kB or 19% of the original size.

Requests Now

After Optimization

Besides the initial HTML request, no CSS, Javascripts, AJAX or image files were requested in the course of web page rendering.

Language and Encoding

Language Detected

Language Claimed

N/A

Encoding

N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Cdn.kastatic.org can be misinterpreted by Google and other search engines. Our service has detected that English 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 Cdn.kastatic.org main page’s claimed encoding is . 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.

Social Sharing Optimization

cdn.kastatic.org

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