Access dfvent.com. 佛山市大风通风科技有限公司-首页

name

value

score

weighting

FCP (First Contentful Paint)

Value4.5 s

14/100

10%

LCP (Largest Contentful Paint)

Value20.5 s

0/100

25%

SI (Speed Index)

Value16.1 s

0/100

10%

TBT (Total Blocking Time)

Value1,310 ms

18/100

30%

CLS (Cumulative Layout Shift)

Value0.875

3/100

15%

TTI (Time to Interactive)

Value10.0 s

26/100

10%

dfvent.com

854 ms

30536_zh-cn.html.Head.js

1231 ms

30536_zh-cn.html.Body.js

2102 ms

pcstyle.css

265 ms

reset.css

271 ms

Our browser made a total of 116 requests to load all elements on the main page. We found that 2% of them (2 requests) were addressed to the original Dfvent.com, 98% (114 requests) were made to Nwzimg.wezhan.cn. The less responsive or slowest element that took the longest time to load (2.1 sec) relates to the external source Nwzimg.wezhan.cn.

Content Size

2.1 MB

After Optimization

1.2 MB

In fact, the total size of Dfvent.com main page is 2.1 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. 60% of websites need less resources to load. Images take 1.5 MB which makes up the majority of the site volume.

HTML Optimization

-89%

Potential reduce by 204.4 kB

Original 228.8 kB
After minification 202.4 kB
After compression 24.3 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. This page needs HTML code to be minified as it can gain 26.3 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 204.4 kB or 89% of the original size.

Image Optimization

-49%

Potential reduce by 719.3 kB

Original 1.5 MB
After minification 746.3 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. Obviously, Dfvent needs image optimization as it can save up to 719.3 kB or 49% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-11%

Potential reduce by 46.7 kB

Original 408.8 kB
After minification 408.6 kB
After compression 362.1 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 46.7 kB or 11% of the original size.

CSS Optimization

-23%

Potential reduce by 9.1 kB

Original 40.4 kB
After minification 35.8 kB
After compression 31.3 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. Dfvent.com needs all CSS files to be minified and compressed as it can save up to 9.1 kB or 23% of the original size.

Requests Now

114

After Optimization

The browser has sent 114 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dfvent. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 22 to 1 for JavaScripts and from 11 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

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 interpretation of your content by users in different locales.

High

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

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

Image elements do not have [alt] attributes

High

Links do not have a discernible name

These items highlight common accessibility best practices.

High

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

Areas of Improvement

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

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 Dfvent.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 Dfvent.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

dfvent.com

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

佛山市大风通风科技有限公司-首页

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

dfvent.com

30536_zh-cn.html.Head.js

30536_zh-cn.html.Body.js

pcstyle.css

reset.css

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

dfvent.com

30536_zh-cn.html.Head.js

30536_zh-cn.html.Body.js

pcstyle.css

reset.css

iconfont.css

iconfont.css

iconfont.css

pager.css

hover-effects.css

antChain.css

video-js.min.css

30536_Pc_zh-CN.css

jquery-3.6.3.min.js

jquery.lazyload.min.js

smart.animation.min.js

kino.razor.min.js

common.min.js

admin.validator.min.js

jquery.cookie.js

jssor.slider-22.2.16-all.min.js

jquery.jqueryzoom.js

jquery.SuperSlide.2.1.1.js

jqPaginator.min.js

lz-slider.min.js

lz-preview.min.js

slideshow.js

video.min.js

41701405.png

videodefault.png

polyfill.min.js

slicknav.css

jquery.slicknav.min.js

modernizr.min.js

ResponsiveJsLoader.js

50291088.jpg

42275416.jpg

42309460.jpg

42310507.jpg

42275165.jpg

43360950.jpg

51093926.png

51093974.jpg