Tools & Wizards About Us
langchem.com screenshot

Report Summary

  • 52

    Performance

    Renders faster than
    69% of other websites

  • 46

    Accessibility

    Visual factors better than
    that of 20% of websites

  • 0

    Best Practices

  • 83

    SEO

    Google-friendlier than
    46% of websites

langchem.com

完美体育●(中国)官方网站-365WM SPORTS☻

Page Load Speed

6.8 sec in total

First Response

846 ms

Resources Loaded

5.9 sec

Page Rendered

86 ms

langchem.com screenshot

About Website

Visit langchem.com now to see the best up-to-date Langchem content and also check out these interesting facts you probably never knew about langchem.com

上海亚兴生物医药科技有限公司,abotchem,化学试剂，定制合成

Visit langchem.com

Key Findings

We analyzed Langchem.com page load time and found that the first response time was 846 ms and then it took 5.9 sec to load all DOM resources and completely render a web page. This is a poor result, as 80% of websites can load faster.

Performance Metrics

langchem.com performance score

52

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.9 s

4/100

10%

LCP (Largest Contentful Paint)

Value7.9 s

3/100

25%

SI (Speed Index)

Value7.6 s

26/100

10%

TBT (Total Blocking Time)

Value170 ms

93/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value6.7 s

56/100

10%

Network Requests Diagram

langchem.com

846 ms

ty.js

1237 ms

css.css

418 ms

leftnav.css

421 ms

Lefnav.js

218 ms

Our browser made a total of 22 requests to load all elements on the main page. We found that 77% of them (17 requests) were addressed to the original Langchem.com, 9% (2 requests) were made to Hm.baidu.com and 5% (1 request) were made to Asdw-kk25t.com. The less responsive or slowest element that took the longest time to load (2.3 sec) belongs to the original domain Langchem.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 18.2 kB (14%)

Content Size

128.5 kB

After Optimization

110.3 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Langchem.com main page is 128.5 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. Only 10% of websites need less resources to load. Images take 109.2 kB which makes up the majority of the site volume.

HTML Optimization

-72%

Potential reduce by 11.6 kB

  • Original 16.1 kB
  • After minification 14.9 kB
  • After compression 4.5 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 11.6 kB or 72% of the original size.

Image Optimization

-5%

Potential reduce by 5.6 kB

  • Original 109.2 kB
  • After minification 103.6 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. Langchem images are well optimized though.

JavaScript Optimization

-28%

Potential reduce by 305 B

  • Original 1.1 kB
  • After minification 1.1 kB
  • After compression 800 B

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 305 B or 28% of the original size.

CSS Optimization

-33%

Potential reduce by 710 B

  • Original 2.2 kB
  • After minification 2.2 kB
  • After compression 1.5 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. Langchem.com needs all CSS files to be minified and compressed as it can save up to 710 B or 33% of the original size.

Requests Breakdown

Number of requests can be reduced by 6 (30%)

Requests Now

20

After Optimization

14

  • Images
  • JavaScript
  • CSS

The browser has sent 20 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Langchem. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests and as a result speed up the page load time.

Network Requests Diagram

langchem.com

langchem.com

846 ms

ty.js

ty.js

1237 ms

css.css

css.css

418 ms

leftnav.css

leftnav.css

421 ms

Lefnav.js

Lefnav.js

218 ms

hm.js

hm.js

1440 ms

pa

pa

932 ms

uk.gif

uk.gif

212 ms

topnav_Line.gif

topnav_Line.gif

212 ms

cn.gif

cn.gif

211 ms

logo.gif

logo.gif

412 ms

menuBg.gif

menuBg.gif

421 ms

menuLine.gif

menuLine.gif

419 ms

button-search.gif

button-search.gif

420 ms

tel.gif

tel.gif

630 ms

main3.jpg

main3.jpg

2321 ms

leftnav-bg.png

leftnav-bg.png

599 ms

leftnav-chevron.gif

leftnav-chevron.gif

604 ms

Index_leftNewProTitle.gif

Index_leftNewProTitle.gif

606 ms

QuickLink.gif

QuickLink.gif

817 ms

hm.gif

hm.gif

313 ms

button_131.gif

button_131.gif

1004 ms

Accessibility Review

langchem.com accessibility score

46

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.

Internationalization and localization

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

Impact

Issue

High

<html> element does not have a [lang] attribute

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

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

SEO Factors

langchem.com SEO score

83

Search Engine Optimization Advices

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

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    GB2312

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Langchem.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 Langchem.com main page’s claimed encoding is gb2312. 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.

Social Sharing Optimization

langchem.com

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