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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.asiaWe 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.
opticaldevice.asia performance score
name
value
score
weighting
Value1.4 s
97/100
10%
Value1.5 s
100/100
25%
Value3.6 s
87/100
10%
Value0 ms
100/100
30%
Value0.098
90/100
15%
Value1.4 s
100/100
10%
1020 ms
222 ms
431 ms
429 ms
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 size can be reduced by 38.3 kB (12%)
309.2 kB
270.8 kB
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.
Potential reduce by 12.1 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.
Potential reduce by 25.0 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.
Potential reduce by 446 B
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.
Potential reduce by 786 B
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.
Number of requests can be reduced by 3 (10%)
29
26
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.
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opticaldevice.asia accessibility score
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
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
<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
Image elements do not have [alt] attributes
<input type="image"> elements do not have [alt] text
Form elements do not have associated labels
<object> elements do not have alternate text
opticaldevice.asia best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Displays images with incorrect aspect ratio
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
opticaldevice.asia SEO score
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Impact
Issue
Links do not have descriptive text
Image elements do not have [alt] attributes
Document uses plugins
EN
N/A
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.
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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: