Tools & Wizards About Us
chemical-cd.com screenshot

Report Summary

  • 21

    Performance

    Renders faster than
    39% of other websites

  • 69

    Accessibility

    Visual factors better than
    that of 35% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    19% of websites

  • 82

    SEO

    Google-friendlier than
    44% of websites

chemical-cd.com

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Page Load Speed

19.5 sec in total

First Response

1.9 sec

Resources Loaded

17.1 sec

Page Rendered

571 ms

chemical-cd.com screenshot

About Website

Click here to check amazing Chemical Cd content. Otherwise, check out these important facts you probably never knew about chemical-cd.com

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Visit chemical-cd.com

Key Findings

We analyzed Chemical-cd.com page load time and found that the first response time was 1.9 sec and then it took 17.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 95% of websites can load faster.

Performance Metrics

chemical-cd.com performance score

21

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.9 s

24/100

10%

LCP (Largest Contentful Paint)

Value22.7 s

0/100

25%

SI (Speed Index)

Value10.4 s

8/100

10%

TBT (Total Blocking Time)

Value1,780 ms

10/100

30%

CLS (Cumulative Layout Shift)

Value0.038

100/100

15%

TTI (Time to Interactive)

Value19.3 s

2/100

10%

Network Requests Diagram

chemical-cd.com

1875 ms

www.chemical-cd.com

1735 ms

all.js

2406 ms

allover.css

651 ms

index.css

1006 ms

Our browser made a total of 35 requests to load all elements on the main page. We found that 34% of them (12 requests) were addressed to the original Chemical-cd.com, 34% (12 requests) were made to Bdimg.share.baidu.com and 23% (8 requests) were made to Imgcn2.guidechem.com. The less responsive or slowest element that took the longest time to load (6.3 sec) relates to the external source China.guidechem.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 172.1 kB (37%)

Content Size

469.9 kB

After Optimization

297.8 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Chemical-cd.com main page is 469.9 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. 15% of websites need less resources to load. Images take 227.5 kB which makes up the majority of the site volume.

HTML Optimization

-71%

Potential reduce by 14.7 kB

  • Original 20.5 kB
  • After minification 18.1 kB
  • After compression 5.8 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. This page needs HTML code to be minified as it can gain 2.4 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 14.7 kB or 71% of the original size.

Image Optimization

-14%

Potential reduce by 33.0 kB

  • Original 227.5 kB
  • After minification 194.5 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, Chemical Cd needs image optimization as it can save up to 33.0 kB or 14% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-53%

Potential reduce by 105.9 kB

  • Original 198.1 kB
  • After minification 185.4 kB
  • After compression 92.2 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 105.9 kB or 53% of the original size.

CSS Optimization

-78%

Potential reduce by 18.6 kB

  • Original 23.8 kB
  • After minification 22.3 kB
  • After compression 5.2 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. Chemical-cd.com needs all CSS files to be minified and compressed as it can save up to 18.6 kB or 78% of the original size.

Requests Breakdown

Number of requests can be reduced by 13 (39%)

Requests Now

33

After Optimization

20

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 33 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Chemical Cd. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 14 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

chemical-cd.com

chemical-cd.com

1875 ms

www.chemical-cd.com

www.chemical-cd.com

1735 ms

all.js

all.js

2406 ms

allover.css

allover.css

651 ms

index.css

index.css

1006 ms

img.js

img.js

651 ms

qq.js

qq.js

747 ms

codejsforwebsite.jsp

codejsforwebsite.jsp

6270 ms

cd-chem$3b8639a535200_d015.png

cd-chem$3b8639a535200_d015.png

2698 ms

163735160904225.jpg

163735160904225.jpg

1263 ms

163735134405342.jpg

163735134405342.jpg

1280 ms

163735143203647.jpg

163735143203647.jpg

1281 ms

163735151001402.jpg

163735151001402.jpg

1294 ms

163735092701958.jpg

163735092701958.jpg

1302 ms

more.png

more.png

369 ms

shfssy1$216a4c1355759_331e.jpg

shfssy1$216a4c1355759_331e.jpg

2738 ms

cd-chem$26c1940efe7e8_4b37.jpg

cd-chem$26c1940efe7e8_4b37.jpg

2402 ms

li_bg.png

li_bg.png

363 ms

qqtop.jpg

qqtop.jpg

694 ms

qqbg.jpg

qqbg.jpg

682 ms

qqbot.jpg

qqbot.jpg

698 ms

img.jsp

img.jsp

398 ms

share.js

share.js

1018 ms

slide_api.js

slide_api.js

352 ms

slide_view.js

slide_view.js

673 ms

select_api.js

select_api.js

696 ms

select_view.js

select_view.js

714 ms

image_api.js

image_api.js

742 ms

image_view.js

image_view.js

754 ms

tangram.js

tangram.js

3056 ms

api_base.js

api_base.js

677 ms

view_base.js

view_base.js

355 ms

logger.js

logger.js

310 ms

slide_share.css

slide_share.css

2695 ms

button_21.gif

button_21.gif

589 ms

Accessibility Review

chemical-cd.com accessibility score

69

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

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

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

[id] attributes on active, focusable elements are not unique

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

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

[lang] attributes do not have a valid value

Best Practices

chemical-cd.com best practices score

58

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

SEO Factors

chemical-cd.com SEO score

82

Search Engine Optimization Advices

Crawling and Indexing

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

Impact

Issue

High

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

High

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

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 Chemical-cd.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 Chemical-cd.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

chemical-cd.com

Open Graph description is not detected on the main page of Chemical Cd. 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: