5.1 sec in total
565 ms
3.6 sec
937 ms
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Codeforces. Programming competitions and contests, programming community
Visit codeforces.comWe analyzed Codeforces.com page load time and found that the first response time was 565 ms and then it took 4.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 70% of websites can load faster.
codeforces.com performance score
name
value
score
weighting
Value5.2 s
8/100
10%
Value5.6 s
17/100
25%
Value5.8 s
50/100
10%
Value170 ms
93/100
30%
Value0.012
100/100
15%
Value8.2 s
40/100
10%
565 ms
814 ms
387 ms
23 ms
35 ms
Our browser made a total of 99 requests to load all elements on the main page. We found that 12% of them (12 requests) were addressed to the original Codeforces.com, 69% (68 requests) were made to St.codeforces.com and 4% (4 requests) were made to Mc.yandex.ru. The less responsive or slowest element that took the longest time to load (1.5 sec) relates to the external source St.codeforces.com.
Page size can be reduced by 1.0 MB (45%)
2.4 MB
1.3 MB
In fact, the total size of Codeforces.com main page is 2.4 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. 50% of websites need less resources to load. Images take 1.2 MB which makes up the majority of the site volume.
Potential reduce by 191.2 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 191.2 kB or 86% of the original size.
Potential reduce by 135.0 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. Obviously, Codeforces needs image optimization as it can save up to 135.0 kB or 11% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 658.9 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 658.9 kB or 78% of the original size.
Potential reduce by 64.0 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. Codeforces.com needs all CSS files to be minified and compressed as it can save up to 64.0 kB or 78% of the original size.
Number of requests can be reduced by 73 (76%)
96
23
The browser has sent 96 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Codeforces. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 30 to 1 for JavaScripts and from 23 to 1 for CSS and as a result speed up the page load time.
codeforces.com
565 ms
jquery-1.8.3.js
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font-awesome.min.css
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codeforces.com accessibility score
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
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.
Impact
Issue
Image elements do not have [alt] attributes
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>).
codeforces.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
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
codeforces.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
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
EN
N/A
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Codeforces.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 Codeforces.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.
codeforces.com
Open Graph description is not detected on the main page of Codeforces. 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: