Access onv.com.cn. 工业POE供电交换机-物联网控制箱-智能箱厂家-ONV光网视-光网视科技-网管交换机-工业网管交换机-OEM/ODM定制

onv.com.cn screenshot

28

Performance

Renders faster than
48% of other websites
55

Accessibility

Visual factors better than
that of 23% of websites
58

Best Practices

More advanced features
available than in
19% of websites
83

SEO

Google-friendlier than
46% of websites

First Response

1.1 sec

Resources Loaded

49.2 sec

Page Rendered

250 ms

onv.com.cn screenshot

About Website

Click here to check amazing Onv content. Otherwise, check out these important facts you probably never knew about onv.com.cn

深圳市光网视科技有限公司（ONV）是国内专业的POE交换机,工业交换机,控制箱,物联网箱,智能箱,工业POE交换机,核心交换机,无线网桥,光纤收发器,供电器,中继器,工业电源,工业路由的交换机厂家,致力于为全球客户提供领先,专业,有特色的安防传输产品和工业物联网传输解决方案

Visit onv.com.cn

Key Findings

We analyzed Onv.com.cn page load time and found that the first response time was 1.1 sec and then it took 49.4 sec to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster. Unfortunately, there were 4 request timeouts, which can generally increase the web page load time, as the browser stays idle while waiting for website response.

name

value

score

weighting

FCP (First Contentful Paint)

Value5.7 s

5/100

10%

LCP (Largest Contentful Paint)

Value8.1 s

2/100

25%

SI (Speed Index)

Value16.7 s

0/100

10%

TBT (Total Blocking Time)

Value280 ms

80/100

30%

CLS (Cumulative Layout Shift)

Value0.514

15/100

15%

TTI (Time to Interactive)

Value14.6 s

8/100

10%

onv.com.cn

1119 ms

www.onv.com.cn

4794 ms

style.css

1874 ms

jquery-1.8.3.min.js

1936 ms

js.js

748 ms

Our browser made a total of 171 requests to load all elements on the main page. We found that 63% of them (108 requests) were addressed to the original Onv.com.cn, 9% (16 requests) were made to Qiao.baidu.com and 8% (13 requests) were made to Static.bshare.cn. The less responsive or slowest element that took the longest time to load (20.4 sec) belongs to the original domain Onv.com.cn.

Content Size

10.5 MB

After Optimization

8.5 MB

In fact, the total size of Onv.com.cn main page is 10.5 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. 40% of websites need less resources to load. Images take 9.9 MB which makes up the majority of the site volume.

HTML Optimization

-91%

Potential reduce by 310.2 kB

Original 339.5 kB
After minification 288.1 kB
After compression 29.3 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 51.4 kB, which is 15% 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 310.2 kB or 91% of the original size.

Image Optimization

-15%

Potential reduce by 1.5 MB

Original 9.9 MB
After minification 8.4 MB

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, Onv needs image optimization as it can save up to 1.5 MB or 15% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-57%

Potential reduce by 97.8 kB

Original 171.3 kB
After minification 164.3 kB
After compression 73.5 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 97.8 kB or 57% of the original size.

CSS Optimization

-85%

Potential reduce by 98.6 kB

Original 115.4 kB
After minification 98.5 kB
After compression 16.8 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. Onv.com.cn needs all CSS files to be minified and compressed as it can save up to 98.6 kB or 85% of the original size.

Requests Now

158

After Optimization

107

The browser has sent 158 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Onv. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 25 to 1 for JavaScripts and from 6 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

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.

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 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

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

High

Browser errors were logged to the console

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 Onv.com.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 Onv.com.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

onv.com.cn

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