Report Summary

  • 2

    Performance

    Renders faster than
    19% of other websites

  • 73

    Accessibility

    Visual factors better than
    that of 39% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 80

    SEO

    Google-friendlier than
    42% of websites

clp.ac.cn

首页-中国激光杂志社

Page Load Speed

16.4 sec in total

First Response

1 sec

Resources Loaded

15 sec

Page Rendered

381 ms

clp.ac.cn screenshot

About Website

Click here to check amazing Clp content. Otherwise, check out these important facts you probably never knew about clp.ac.cn

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Key Findings

We analyzed Clp.ac.cn page load time and found that the first response time was 1 sec and then it took 15.4 sec to load all DOM resources and completely render a web page. This is a poor result, as 90% of websites can load faster.

Performance Metrics

clp.ac.cn performance score

2

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.3 s

7/100

10%

LCP (Largest Contentful Paint)

Value18.5 s

0/100

25%

SI (Speed Index)

Value18.8 s

0/100

10%

TBT (Total Blocking Time)

Value7,980 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0.696

7/100

15%

TTI (Time to Interactive)

Value17.4 s

4/100

10%

Network Requests Diagram

clp.ac.cn

1038 ms

www.clp.ac.cn

1235 ms

layer.css

383 ms

share.min.css

575 ms

bootstrap.min.css

2454 ms

Our browser made a total of 40 requests to load all elements on the main page. We found that 85% of them (34 requests) were addressed to the original Clp.ac.cn, 15% (6 requests) were made to Opticsjournal.net. The less responsive or slowest element that took the longest time to load (9.7 sec) relates to the external source Opticsjournal.net.

Page Optimization Overview & Recommendations

Page size can be reduced by 689.7 kB (40%)

Content Size

1.7 MB

After Optimization

1.0 MB

In fact, the total size of Clp.ac.cn main page is 1.7 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. 25% of websites need less resources to load. Images take 1.3 MB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 14.8 kB

  • Original 19.2 kB
  • After minification 16.4 kB
  • After compression 4.4 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 2.8 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 14.8 kB or 77% of the original size.

Image Optimization

-29%

Potential reduce by 373.0 kB

  • Original 1.3 MB
  • After minification 934.9 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, Clp needs image optimization as it can save up to 373.0 kB or 29% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-67%

Potential reduce by 125.7 kB

  • Original 187.4 kB
  • After minification 173.2 kB
  • After compression 61.7 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 125.7 kB or 67% of the original size.

CSS Optimization

-84%

Potential reduce by 176.1 kB

  • Original 209.5 kB
  • After minification 204.3 kB
  • After compression 33.4 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. Clp.ac.cn needs all CSS files to be minified and compressed as it can save up to 176.1 kB or 84% of the original size.

Requests Breakdown

Number of requests can be reduced by 15 (39%)

Requests Now

38

After Optimization

23

The browser has sent 38 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Clp. 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 from 7 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

clp.ac.cn accessibility score

73

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

[aria-*] attributes do not match their roles

High

ARIA input fields do not have accessible names

High

Elements with an ARIA [role] that require children to contain a specific [role] are missing some or all of those required children.

High

ARIA toggle fields do not have accessible names

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

Links do not have a discernible name

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.

Best Practices

clp.ac.cn best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

clp.ac.cn SEO score

80

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

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

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 Clp.ac.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 Clp.ac.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

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