Access opticsky.cn. 光行天下-光电行业门户-光学,光电,光机技术及其软件运用专业网站!

name

value

score

weighting

FCP (First Contentful Paint)

Value2.7 s

60/100

10%

LCP (Largest Contentful Paint)

Value10.6 s

0/100

25%

SI (Speed Index)

Value9.0 s

14/100

10%

TBT (Total Blocking Time)

Value1,010 ms

27/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value15.6 s

6/100

10%

opticsky.cn

923 ms

pw_core.css

430 ms

head.css

426 ms

style.css

427 ms

core.js

640 ms

Our browser made a total of 83 requests to load all elements on the main page. We found that 89% of them (74 requests) were addressed to the original Opticsky.cn, 4% (3 requests) were made to Googleads.g.doubleclick.net and 2% (2 requests) were made to Pagead2.googlesyndication.com. The less responsive or slowest element that took the longest time to load (11.2 sec) belongs to the original domain Opticsky.cn.

Content Size

6.6 MB

After Optimization

4.5 MB

In fact, the total size of Opticsky.cn main page is 6.6 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. 65% of websites need less resources to load. Images take 6.0 MB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 76.3 kB

Original 98.6 kB
After minification 97.1 kB
After compression 22.3 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. 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 76.3 kB or 77% of the original size.

Image Optimization

-30%

Potential reduce by 1.8 MB

Original 6.0 MB
After minification 4.2 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, Opticsky needs image optimization as it can save up to 1.8 MB or 30% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-42%

Potential reduce by 188.1 kB

Original 444.9 kB
After minification 422.9 kB
After compression 256.8 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 188.1 kB or 42% of the original size.

CSS Optimization

-22%

Potential reduce by 2.7 kB

Original 12.2 kB
After minification 12.2 kB
After compression 9.5 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. Opticsky.cn needs all CSS files to be minified and compressed as it can save up to 2.7 kB or 22% of the original size.

Requests Now

After Optimization

The browser has sent 82 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Opticsky. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 10 to 1 for JavaScripts 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 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.

High

Definition list items are not wrapped in <dl> elements

High

Lists do not contain only <li> elements and script supporting elements (<script> and <template>).

High

List items (<li>) are not contained within <ul> or <ol> parent elements.

These are opportunities to improve keyboard navigation in your application.

High

Heading elements are not in a sequentially-descending order

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

Form elements do not have associated labels

High

Links do not have a discernible name

Areas of Improvement

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

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

Language and Encoding

Language Detected

ZH
Language Claimed

N/A
Encoding

GBK

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Opticsky.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 Opticsky.cn main page’s claimed encoding is gbk. 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

opticsky.cn

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

光行天下-光电行业门户-光学,光电,光机技术及其软件运用专业网站!

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

opticsky.cn

pw_core.css

head.css

style.css

core.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

opticsky.cn

pw_core.css

head.css

style.css

core.js

pw_ajax.js

adsbygoogle.js

mode.php

ddsliderplayer.js

global.js

zh_cn.js

524242121211.gif

1709298609949.jpg

bg.jpg

topbar.png

logo-index.gif

posts.png

medal.png

friend.png

jobcenter.png

ctj202456.gif

20240506133038.jpg

20240422052000.jpg

20240328034523.jpg

20240314030202.png

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20240414070319.png

20240412101853.jpg

20240328032330.png

20240325041948.jpg

20240320044150.png

20240306141246.png

jl2012318.gif

2024course.gif

oed3.gif

ao1019.gif

zhao9.gif

hxu430730.gif

20140524155002.jpg

20140524152020.jpg

20140524151307.jpg

zsgfxi.png

tfc.jpg