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Visit training.oreilly.comWe analyzed Training.oreilly.com page load time and found that the first response time was 181 ms and then it took 1.8 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.
training.oreilly.com performance score
name
value
score
weighting
Value5.1 s
9/100
10%
Value19.4 s
0/100
25%
Value10.8 s
7/100
10%
Value2,660 ms
4/100
30%
Value0.206
60/100
15%
Value21.5 s
1/100
10%
181 ms
369 ms
21 ms
38 ms
38 ms
Our browser made a total of 89 requests to load all elements on the main page. We found that 1% of them (1 request) were addressed to the original Training.oreilly.com, 30% (27 requests) were made to Shop.oreilly.com and 29% (26 requests) were made to Akamaicovers.oreilly.com. The less responsive or slowest element that took the longest time to load (369 ms) relates to the external source Shop.oreilly.com.
Page size can be reduced by 358.4 kB (34%)
1.1 MB
694.9 kB
In fact, the total size of Training.oreilly.com main page is 1.1 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. 65% of websites need less resources to load. Images take 550.9 kB which makes up the majority of the site volume.
Potential reduce by 112.1 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 112.1 kB or 83% of the original size.
Potential reduce by 2.7 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. Training O Reilly images are well optimized though.
Potential reduce by 151.1 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 151.1 kB or 59% of the original size.
Potential reduce by 92.5 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. Training.oreilly.com needs all CSS files to be minified and compressed as it can save up to 92.5 kB or 82% of the original size.
Number of requests can be reduced by 35 (41%)
85
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The browser has sent 85 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Training O Reilly. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 25 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.
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training.oreilly.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
[aria-*] attributes do not match their roles
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>).
training.oreilly.com best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Ensure CSP is effective against XSS attacks
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
Missing source maps for large first-party JavaScript
training.oreilly.com 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
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
EN
N/A
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Training.oreilly.com 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 Training.oreilly.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.
training.oreilly.com
Open Graph data is detected on the main page of Training O Reilly. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: