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opticaldevice.asia screenshot

Report Summary

  • 97

    Performance

    Renders faster than
    94% of other websites

  • 41

    Accessibility

    Visual factors better than
    that of 19% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 54

    SEO

    Google-friendlier than
    19% of websites

opticaldevice.asia

Optical Device Company,optical ,device,-Optical Device Company

Page Load Speed

4.2 sec in total

First Response

1 sec

Resources Loaded

3 sec

Page Rendered

125 ms

opticaldevice.asia screenshot

About Website

Welcome to opticaldevice.asia homepage info - get ready to check Optical Device best content right away, or after learning these important things about opticaldevice.asia

Optical Device Company, head quartered in Hong Kong, is a professional ophthalmic instrument supplier, distributing well-known brands of ophthalmic instruments, trading of used optical instruments. No...

Visit opticaldevice.asia

Key Findings

We analyzed Opticaldevice.asia page load time and found that the first response time was 1 sec and then it took 3.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 55% of websites can load faster.

Performance Metrics

opticaldevice.asia performance score

97

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.4 s

97/100

10%

LCP (Largest Contentful Paint)

Value1.5 s

100/100

25%

SI (Speed Index)

Value3.6 s

87/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.098

90/100

15%

TTI (Time to Interactive)

Value1.4 s

100/100

10%

Network Requests Diagram

opticaldevice.asia

1020 ms

metinfo.css

222 ms

public.js

431 ms

reset.css

429 ms

metinfo-min.js

655 ms

Our browser made a total of 30 requests to load all elements on the main page. We found that all of those requests were addressed to Opticaldevice.asia and no external sources were called. The less responsive or slowest element that took the longest time to load (1.1 sec) belongs to the original domain Opticaldevice.asia.

Page Optimization Overview & Recommendations

Page size can be reduced by 38.3 kB (12%)

Content Size

309.2 kB

After Optimization

270.8 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Opticaldevice.asia main page is 309.2 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 20% of websites need less resources to load. Images take 261.4 kB which makes up the majority of the site volume.

HTML Optimization

-75%

Potential reduce by 12.1 kB

  • Original 16.2 kB
  • After minification 15.9 kB
  • After compression 4.1 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 12.1 kB or 75% of the original size.

Image Optimization

-10%

Potential reduce by 25.0 kB

  • Original 261.4 kB
  • After minification 236.4 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. Optical Device images are well optimized though.

JavaScript Optimization

-2%

Potential reduce by 446 B

  • Original 26.7 kB
  • After minification 26.7 kB
  • After compression 26.2 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. This website has mostly compressed JavaScripts.

CSS Optimization

-16%

Potential reduce by 786 B

  • Original 4.9 kB
  • After minification 4.9 kB
  • After compression 4.1 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. Opticaldevice.asia needs all CSS files to be minified and compressed as it can save up to 786 B or 16% of the original size.

Requests Breakdown

Number of requests can be reduced by 3 (10%)

Requests Now

29

After Optimization

26

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 29 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Optical Device. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 4 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

opticaldevice.asia

opticaldevice.asia

1020 ms

metinfo.css

metinfo.css

222 ms

public.js

public.js

431 ms

reset.css

reset.css

429 ms

metinfo-min.js

metinfo-min.js

655 ms

fun.inc.js

fun.inc.js

437 ms

online.js

online.js

437 ms

opticaldevice.asia

opticaldevice.asia

531 ms

1406009942.jpg

1406009942.jpg

443 ms

botton.gif

botton.gif

228 ms

nav.png

nav.png

220 ms

navline.png

navline.png

224 ms

1317291765.jpg

1317291765.jpg

222 ms

1480474145.jpg

1480474145.jpg

439 ms

1480473418.jpg

1480473418.jpg

462 ms

1480473059.jpg

1480473059.jpg

445 ms

1480411395.jpg

1480411395.jpg

678 ms

1480411404.jpg

1480411404.jpg

661 ms

1480410839.jpg

1480410839.jpg

666 ms

1407922059.jpg

1407922059.jpg

667 ms

1317291842.jpg

1317291842.jpg

679 ms

1406003593.jpg

1406003593.jpg

749 ms

private%20pic_.jpg

private%20pic_.jpg

1093 ms

rrr.gif

rrr.gif

877 ms

indexline.gif

indexline.gif

880 ms

online3_1_1.gif

online3_1_1.gif

222 ms

online3_5_1.gif

online3_5_1.gif

224 ms

online3_3_1.gif

online3_3_1.gif

225 ms

online3_4_1.gif

online3_4_1.gif

220 ms

online3_7_1.gif

online3_7_1.gif

223 ms

Accessibility Review

opticaldevice.asia accessibility score

41

Accessibility Issues

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

Image elements do not have [alt] attributes

High

<input type="image"> elements do not have [alt] text

High

Form elements do not have associated labels

High

<object> elements do not have alternate text

Best Practices

opticaldevice.asia best practices score

58

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

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

opticaldevice.asia SEO score

54

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Links do not have descriptive text

High

Image elements do not have [alt] attributes

High

Document uses plugins

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 Opticaldevice.asia 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 Opticaldevice.asia 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

opticaldevice.asia

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