Access selleck.cn. Selleck中国官网 - 活性化合物专家（活性化合物，化合物库）

name

value

score

weighting

FCP (First Contentful Paint)

Value8.6 s

0/100

10%

LCP (Largest Contentful Paint)

Value13.4 s

0/100

25%

SI (Speed Index)

Value17.4 s

0/100

10%

TBT (Total Blocking Time)

Value2,090 ms

7/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value27.4 s

0/100

10%

selleck.cn

515 ms

selleck.cn

1661 ms

font.css

4026 ms

base.css

1305 ms

jquery.min.js

1135 ms

Our browser made a total of 53 requests to load all elements on the main page. We found that 32% of them (17 requests) were addressed to the original Selleck.cn, 21% (11 requests) were made to Webpage.qidian.qq.com and 11% (6 requests) were made to File.selleck.cn. The less responsive or slowest element that took the longest time to load (4 sec) belongs to the original domain Selleck.cn.

Content Size

918.7 kB

After Optimization

757.0 kB

In fact, the total size of Selleck.cn main page is 918.7 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. 50% of websites need less resources to load. Images take 340.4 kB which makes up the majority of the site volume.

HTML Optimization

-87%

Potential reduce by 133.3 kB

Original 153.1 kB
After minification 92.6 kB
After compression 19.8 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 60.6 kB, which is 40% 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 133.3 kB or 87% of the original size.

Image Optimization

-1%

Potential reduce by 3.2 kB

Original 340.4 kB
After minification 337.3 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. Selleck images are well optimized though.

JavaScript Optimization

-7%

Potential reduce by 22.4 kB

Original 310.5 kB
After minification 310.5 kB
After compression 288.0 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. This website has mostly compressed JavaScripts.

CSS Optimization

-2%

Potential reduce by 2.8 kB

Original 114.6 kB
After minification 114.6 kB
After compression 111.8 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. Selleck.cn has all CSS files already compressed.

Requests Now

After Optimization

The browser has sent 46 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Selleck. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 24 to 1 for JavaScripts and from 4 to 1 for CSS 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

Form elements do not have associated labels

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.

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

High

<dl>'s do not contain only properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements.

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

High

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

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

Serves images with low resolution

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

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 Selleck.cn 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 Selleck.cn 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

selleck.cn

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

Selleck中国官网 - 活性化合物专家（活性化合物，化合物库）

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

selleck.cn

selleck.cn

font.css

base.css

jquery.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

selleck.cn

selleck.cn

font.css

base.css

jquery.min.js

bootstrap.min.js

jquery.autocomplete.min.js

cookieRecord.js

base.js

homepage.js

897ec3d86b8b5ffb6efc37431817e996

hm.js

rt.js

gtm.js

logo_selleck_cn.png

sprite.svg

icon-home.png

the-nobel-prize.png

icon-FreeDelivery.png

flag-china.png

sprites.svg

police.png

Electronic_business_license.jpg

loadCustomer.html

wPGQ07tAAAAAAAAAQAAAADVpCcIAAAAAMk1MYsAAAAAyehMTA==

A8ZDTu0AAAAAAAABAAAAANWkJwgAAAAAyUIXoAAAAADJ6Eqh

banner-light-01.png

cns230606.png

view_productList.jhtml

analytics.js

EeBI9NRNkPNdMkcnkRwmpeAM15VSN

pk1.js

collect

i.js

jsonp

getGrayLevel

hm.gif

pc.html

index.html

initQidianMonitor.js

instant.js

qidianMonitor.umd.min.js

feedback-1.2.27.js