Tools & Wizards About Us

Report Summary

  • 57

    Performance

    Renders faster than
    73% of other websites

  • 98

    Accessibility

    Visual factors better than
    that of 94% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 100

    SEO

    Google-friendlier than
    94% of websites

robertsonoptical.com

Robertson Optical Laboratories, Inc. | Advanced Free Form Lens Technology & AR Portfolios

Page Load Speed

766 ms in total

First Response

87 ms

Resources Loaded

591 ms

Page Rendered

88 ms

About Website

Click here to check amazing Robertson Optical content. Otherwise, check out these important facts you probably never knew about robertsonoptical.com

We provide on-site digital edging and only the most advanced free form lens and AR portfolios, complete pair frame solutions and more. Robertson Optical Labs is family owned and operated, serving inde...

Visit robertsonoptical.com

Key Findings

We analyzed Robertsonoptical.com page load time and found that the first response time was 87 ms and then it took 679 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.

Performance Metrics

robertsonoptical.com performance score

57

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.5 s

67/100

10%

LCP (Largest Contentful Paint)

Value5.7 s

16/100

25%

SI (Speed Index)

Value3.2 s

92/100

10%

TBT (Total Blocking Time)

Value470 ms

61/100

30%

CLS (Cumulative Layout Shift)

Value0.006

100/100

15%

TTI (Time to Interactive)

Value8.0 s

43/100

10%

Network Requests Diagram

www.robertsonoptical.com

87 ms

minified.js

47 ms

focus-within-polyfill.js

43 ms

polyfill.min.js

36 ms

thunderbolt-commons.2ae1974e.bundle.min.js

126 ms

Our browser made a total of 48 requests to load all elements on the main page. We found that 2% of them (1 request) were addressed to the original Robertsonoptical.com, 40% (19 requests) were made to Static.parastorage.com and 27% (13 requests) were made to Static.wixstatic.com. The less responsive or slowest element that took the longest time to load (227 ms) relates to the external source Static.wixstatic.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 353.2 kB (48%)

Content Size

733.0 kB

After Optimization

379.8 kB

  • HTML
  • Images
  • JavaScript

In fact, the total size of Robertsonoptical.com main page is 733.0 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. 30% of websites need less resources to load. HTML takes 464.5 kB which makes up the majority of the site volume.

HTML Optimization

-74%

Potential reduce by 345.9 kB

  • Original 464.5 kB
  • After minification 462.7 kB
  • After compression 118.5 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 345.9 kB or 74% of the original size.

Image Optimization

-19%

Potential reduce by 5.2 kB

  • Original 27.4 kB
  • After minification 22.2 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, Robertson Optical needs image optimization as it can save up to 5.2 kB or 19% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-1%

Potential reduce by 2.0 kB

  • Original 241.1 kB
  • After minification 241.1 kB
  • After compression 239.1 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. This website has mostly compressed JavaScripts.

Requests Breakdown

Number of requests can be reduced by 10 (36%)

Requests Now

28

After Optimization

18

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 28 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Robertson Optical. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 11 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

robertsonoptical.com accessibility score

98

Accessibility Issues

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

robertsonoptical.com best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

robertsonoptical.com SEO score

100

Search Engine Optimization Advices

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

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Robertsonoptical.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Robertsonoptical.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

Open Graph data is detected on the main page of Robertson Optical. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: