4.1 sec in total
252 ms
3.6 sec
304 ms
Welcome to 21cngems.com homepage info - get ready to check 21cn Gems best content right away, or after learning these important things about 21cngems.com
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Visit 21cngems.comWe analyzed 21cngems.com page load time and found that the first response time was 252 ms and then it took 3.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.
21cngems.com performance score
name
value
score
weighting
Value4.0 s
22/100
10%
Value5.8 s
15/100
25%
Value5.5 s
55/100
10%
Value690 ms
43/100
30%
Value0.007
100/100
15%
Value7.5 s
48/100
10%
252 ms
1328 ms
221 ms
148 ms
278 ms
Our browser made a total of 118 requests to load all elements on the main page. We found that 94% of them (111 requests) were addressed to the original 21cngems.com, 3% (4 requests) were made to Microsofttranslator.com and 1% (1 request) were made to Js.tongji.linezing.com. The less responsive or slowest element that took the longest time to load (1.3 sec) belongs to the original domain 21cngems.com.
Page size can be reduced by 244.2 kB (35%)
704.9 kB
460.7 kB
In fact, the total size of 21cngems.com main page is 704.9 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. 35% of websites need less resources to load. Images take 438.7 kB which makes up the majority of the site volume.
Potential reduce by 133.8 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 133.8 kB or 90% of the original size.
Potential reduce by 26.4 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. 21cn Gems images are well optimized though.
Potential reduce by 58.3 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 58.3 kB or 66% of the original size.
Potential reduce by 25.8 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. 21cngems.com needs all CSS files to be minified and compressed as it can save up to 25.8 kB or 87% of the original size.
Number of requests can be reduced by 29 (25%)
114
85
The browser has sent 114 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 21cn Gems. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 6 to 1 for JavaScripts and as a result speed up the page load time.
21cngems.com
252 ms
www.21cngems.com
1328 ms
stylesheet.css
221 ms
menu.css
148 ms
jquery-1.4.2.min.js
278 ms
menu.js
156 ms
jquery.idTabs.min.js
154 ms
tongji.js
785 ms
bg.jpg
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logo.jpg
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quick_find.gif
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menusep.jpg
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header_middle_x.jpg
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header_left_x.jpg
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header_bullet.gif
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header_right_x.jpg
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button_quick_find.gif
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pixel_trans.gif
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category_button.jpg
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header_middle_y.jpg
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header_left_y.jpg
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arrow_right.gif
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table_background_default.gif
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widget.aspx
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metrics.js
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header_left_z.jpg
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header_right_z.jpg
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button_login.png
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footer_left_y.jpg
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ul-01.gif
407 ms
21cngems.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
Form elements do not have associated labels
Links do not have a discernible name
21cngems.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
Browser errors were logged to the console
21cngems.com SEO score
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Impact
Issue
Links are not crawlable
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
EN
EN
ISO-8859-1
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 21cngems.com 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 21cngems.com main page’s claimed encoding is iso-8859-1. 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.
21cngems.com
Open Graph description is not detected on the main page of 21cn Gems. 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: