Access 21dianyuan.com. 世纪电源网-电子电源行业综合服务商

name

value

score

weighting

FCP (First Contentful Paint)

Value6.4 s

2/100

10%

LCP (Largest Contentful Paint)

Value7.3 s

5/100

25%

SI (Speed Index)

Value11.8 s

4/100

10%

TBT (Total Blocking Time)

Value1,360 ms

17/100

30%

CLS (Cumulative Layout Shift)

Value0.017

100/100

15%

TTI (Time to Interactive)

Value16.0 s

6/100

10%

21dianyuan.com

1394 ms

www.21dianyuan.com

15161 ms

index.css

1004 ms

style.css

2264 ms

jquery-1.11.1.min.js

4497 ms

Our browser made a total of 124 requests to load all elements on the main page. We found that 55% of them (68 requests) were addressed to the original 21dianyuan.com, 33% (41 requests) were made to Static.21dianyuan.com and 2% (3 requests) were made to S0.2mdn.net. The less responsive or slowest element that took the longest time to load (20.5 sec) relates to the external source Static.21dianyuan.com.

Content Size

1.9 MB

After Optimization

856.8 kB

In fact, the total size of 21dianyuan.com main page is 1.9 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. 35% of websites need less resources to load. Javascripts take 1.0 MB which makes up the majority of the site volume.

HTML Optimization

-82%

Potential reduce by 204.5 kB

Original 250.8 kB
After minification 240.2 kB
After compression 46.3 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 204.5 kB or 82% of the original size.

Image Optimization

-11%

Potential reduce by 68.5 kB

Original 596.1 kB
After minification 527.6 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. Obviously, 21 Dianyuan needs image optimization as it can save up to 68.5 kB or 11% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-74%

Potential reduce by 769.2 kB

Original 1.0 MB
After minification 1.0 MB
After compression 276.1 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 769.2 kB or 74% of the original size.

CSS Optimization

-86%

Potential reduce by 41.4 kB

Original 48.2 kB
After minification 37.6 kB
After compression 6.8 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. 21dianyuan.com needs all CSS files to be minified and compressed as it can save up to 41.4 kB or 86% of the original size.

Requests Now

After Optimization

The browser has sent 82 CSS, Javascripts, AJAX and image requests in order to completely render the main page of 21 Dianyuan. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 12 to 1 for JavaScripts and as a result speed up the page load time.

Accessibility Issues

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.

High

Buttons do not have an accessible name

High

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

Low

Detected JavaScript libraries

Search Engine Optimization Advices

To appear in search results, crawlers need access to your app.

High

Links are not crawlable

Format your HTML in a way that enables crawlers to better understand your app’s content.

High

Image elements do not have [alt] attributes

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/).

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

Language Detected

ZH
Language Claimed

N/A
Encoding

UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 21dianyuan.com can be misinterpreted by Google and other search engines. Our service has detected that Chinese 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 21dianyuan.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.

Social Sharing Optimization

21dianyuan.com

Open Graph description is not detected on the main page of 21 Dianyuan. 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:

Report Summary

Performance

Accessibility

Best Practices

SEO

世纪电源网-电子电源行业综合服务商

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

21dianyuan.com

www.21dianyuan.com

index.css

style.css

jquery-1.11.1.min.js

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

21dianyuan.com

www.21dianyuan.com

index.css

style.css

jquery-1.11.1.min.js

jquery-ui.min.js

Xslider.js

jquery.marquee.js

jquery.cxslide.min.js

stat.php

56e1414f78777.gif

close1.gif

keysight_20160219_3.gif

ti_hangzou2016.gif

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icon.jpg

loggo-dian.gif

logo.jpg

cc_160_60.gif

hw_160_60.gif

ksd_160_60.gif

rs_160_60.gif

st_160_60.gif

td_160_60.gif

sw_160_60.gif

tcl_160_60.gif

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icon2.jpg

1418466073548c131906916_small.jpg

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