25.2 sec in total
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We analyzed Onlinejudge.org page load time and found that the first response time was 320 ms and then it took 24.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 95% of websites can load faster.
onlinejudge.org performance score
Our browser made a total of 56 requests to load all elements on the main page. We found that 2% of them (1 request) were addressed to the original Onlinejudge.org, 38% (21 requests) were made to Uva.onlinejudge.org and 18% (10 requests) were made to Tpc.googlesyndication.com. The less responsive or slowest element that took the longest time to load (5.8 sec) relates to the external source Udebug.com.
Page size can be reduced by 536.5 kB (45%)
Potential reduce by 19.4 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. This page needs HTML code to be minified as it can gain 3.2 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 19.4 kB or 72% of the original size.
Potential reduce by 12.9 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. Online Judge images are well optimized though.
Potential reduce by 487.3 kB
Potential reduce by 16.8 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. Onlinejudge.org needs all CSS files to be minified and compressed as it can save up to 16.8 kB or 75% of the original size.
Number of requests can be reduced by 28 (54%)
onlinejudge.org accessibility score
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.
[aria-*] attributes do not match their roles
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
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.
<frame> or <iframe> elements do not have a title
Form elements do not have associated labels
onlinejudge.org best practices score
Trust and Safety
Does not use HTTPS
Ensure CSP is effective against XSS attacks
Serves images with low resolution
Browser errors were logged to the console
onlinejudge.org SEO score
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Onlinejudge.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 Onlinejudge.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.
Open Graph description is not detected on the main page of Online Judge. 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: