2.3 sec in total
514 ms
1.6 sec
119 ms
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Visit ctdn.comWe analyzed Ctdn.com page load time and found that the first response time was 514 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.
ctdn.com performance score
name
value
score
weighting
Value6.7 s
2/100
10%
Value9.2 s
1/100
25%
Value8.5 s
18/100
10%
Value1,670 ms
11/100
30%
Value0.061
97/100
15%
Value23.0 s
1/100
10%
514 ms
176 ms
198 ms
392 ms
196 ms
Our browser made a total of 43 requests to load all elements on the main page. We found that 30% of them (13 requests) were addressed to the original Ctdn.com, 23% (10 requests) were made to D.adroll.com and 7% (3 requests) were made to Facebook.com. The less responsive or slowest element that took the longest time to load (605 ms) belongs to the original domain Ctdn.com.
Page size can be reduced by 250.5 kB (28%)
878.8 kB
628.3 kB
In fact, the total size of Ctdn.com main page is 878.8 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 30% of websites need less resources to load. Images take 564.8 kB which makes up the majority of the site volume.
Potential reduce by 12.2 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 12.2 kB or 74% of the original size.
Potential reduce by 49.6 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. Ctdn images are well optimized though.
Potential reduce by 86.5 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 86.5 kB or 50% of the original size.
Potential reduce by 102.2 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. Ctdn.com needs all CSS files to be minified and compressed as it can save up to 102.2 kB or 82% of the original size.
Number of requests can be reduced by 19 (63%)
30
11
The browser has sent 30 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Ctdn. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and as a result speed up the page load time.
ctdn.com
514 ms
5997e88.css
176 ms
b4005ca.css
198 ms
96d6766.js
392 ms
9cf790f.js
196 ms
sso.min.js
346 ms
dbuttons.png
477 ms
logo.png
86 ms
external4.png
111 ms
calgo_banner.jpg
112 ms
puzzle_banner.png
605 ms
robot_banner.jpg
600 ms
algotypes-small.gif
177 ms
thread.gif
177 ms
gtm.js
48 ms
uYKcPVoh6c5R0NpdEY5A-Q.woff
54 ms
ga.js
6 ms
roundtrip.js
28 ms
fbevents.js
28 ms
__utm.gif
10 ms
105 ms
VYVS24ZM4VC77GKJEZX3IV.js
254 ms
out
8 ms
tr
26 ms
24 ms
out
9 ms
out
8 ms
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18 ms
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22 ms
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21 ms
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20 ms
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19 ms
u.php
74 ms
sync
6 ms
36 ms
adsct
95 ms
pixel
54 ms
377928.gif
7 ms
sd
7 ms
in
9 ms
tap.php
64 ms
caaec58.css
88 ms
ctdn.com 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
<frame> or <iframe> elements do not have a title
Image elements do not have [alt] attributes
Links do not have a discernible name
ctdn.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
General
Impact
Issue
Detected JavaScript libraries
Browser errors were logged to the console
Missing source maps for large first-party JavaScript
ctdn.com SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
robots.txt is not valid
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
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
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 Ctdn.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 Ctdn.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.
ctdn.com
Open Graph description is not detected on the main page of Ctdn. 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: