Tools & Wizards About Us
blueoptical.com screenshot

Report Summary

  • 57

    Performance

    Renders faster than
    74% of other websites

  • 59

    Accessibility

    Visual factors better than
    that of 26% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 89

    SEO

    Google-friendlier than
    67% of websites

blueoptical.com

Shanghai Blue Optics Co.,Ltd.-Shanghai Blue Optics Co.,Ltd.，Shanghai Blue Optics Lens Co.,Ltd.，Jiangsu Blue Optics Co.,Ltd.

Page Load Speed

5 sec in total

First Response

714 ms

Resources Loaded

3.6 sec

Page Rendered

686 ms

blueoptical.com screenshot

About Website

Welcome to blueoptical.com homepage info - get ready to check Blue Optical best content right away, or after learning these important things about blueoptical.com

Blue Optics, formerly known as Shanghai Blue Optics Lens Industry Co., Ltd which was established in year 1995., is one of the biggest optical enterprise in Asia-Pacific regions whose production coveri...

Visit blueoptical.com

Key Findings

We analyzed Blueoptical.com page load time and found that the first response time was 714 ms and then it took 4.3 sec to load all DOM resources and completely render a web page. This is a poor result, as 65% of websites can load faster.

Performance Metrics

blueoptical.com performance score

57

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.2 s

99/100

10%

LCP (Largest Contentful Paint)

Value4.6 s

34/100

25%

SI (Speed Index)

Value7.0 s

32/100

10%

TBT (Total Blocking Time)

Value260 ms

83/100

30%

CLS (Cumulative Layout Shift)

Value0.469

18/100

15%

TTI (Time to Interactive)

Value4.7 s

80/100

10%

Network Requests Diagram

blueoptical.com

714 ms

basic.css

424 ms

index_en.css

410 ms

lang_json_en.js

420 ms

basic.js

826 ms

Our browser made a total of 29 requests to load all elements on the main page. We found that all of those requests were addressed to Blueoptical.com and no external sources were called. The less responsive or slowest element that took the longest time to load (1.6 sec) belongs to the original domain Blueoptical.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 121.4 kB (4%)

Content Size

2.9 MB

After Optimization

2.8 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Blueoptical.com main page is 2.9 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. 55% of websites need less resources to load. Images take 2.5 MB which makes up the majority of the site volume.

HTML Optimization

-88%

Potential reduce by 48.6 kB

  • Original 55.2 kB
  • After minification 37.4 kB
  • After compression 6.6 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 17.8 kB, which is 32% 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 48.6 kB or 88% of the original size.

Image Optimization

-1%

Potential reduce by 34.0 kB

  • Original 2.5 MB
  • After minification 2.5 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. Blue Optical images are well optimized though.

JavaScript Optimization

-11%

Potential reduce by 26.4 kB

  • Original 243.5 kB
  • After minification 243.5 kB
  • After compression 217.1 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 26.4 kB or 11% of the original size.

CSS Optimization

-17%

Potential reduce by 12.4 kB

  • Original 71.6 kB
  • After minification 71.6 kB
  • After compression 59.2 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. Blueoptical.com needs all CSS files to be minified and compressed as it can save up to 12.4 kB or 17% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

25

After Optimization

25

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 25 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Blue Optical. According to our analytics all requests are already optimized.

Network Requests Diagram

blueoptical.com

blueoptical.com

714 ms

basic.css

basic.css

424 ms

index_en.css

index_en.css

410 ms

lang_json_en.js

lang_json_en.js

420 ms

basic.js

basic.js

826 ms

1521427446.png

1521427446.png

214 ms

1521424380.png

1521424380.png

210 ms

1521424430.png

1521424430.png

206 ms

1521425086.png

1521425086.png

444 ms

1521425051.png

1521425051.png

444 ms

1604366838.jpg

1604366838.jpg

445 ms

1604366499.jpg

1604366499.jpg

444 ms

1604369206.jpg

1604369206.jpg

839 ms

1604369763.jpg

1604369763.jpg

971 ms

1604369270.jpg

1604369270.jpg

1602 ms

web-icons.woff

web-icons.woff

754 ms

index_en.js

index_en.js

666 ms

254 ms

ajax-loader.gif

ajax-loader.gif

219 ms

loading.gif

loading.gif

218 ms

1605080294.jpg

1605080294.jpg

624 ms

1605082146.jpg

1605082146.jpg

637 ms

1605082318.jpg

1605082318.jpg

423 ms

1605086376.jpg

1605086376.jpg

429 ms

1604388224.jpg

1604388224.jpg

1075 ms

1604390472885759.jpg

1604390472885759.jpg

675 ms

1604388845.jpg

1604388845.jpg

839 ms

1604388935.jpg

1604388935.jpg

840 ms

slick.woff

slick.woff

829 ms

Accessibility Review

blueoptical.com accessibility score

59

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-hidden="true"] elements contain focusable descendents

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

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

Buttons do not have an accessible name

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.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

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

Tables and lists

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

Impact

Issue

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.

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

blueoptical.com best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

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

Browser errors were logged to the console

SEO Factors

blueoptical.com SEO score

89

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

    EN

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Blueoptical.com can be misinterpreted by Google and other search engines. Our service has detected that English 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 Blueoptical.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

blueoptical.com

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