Tools & Wizards About Us

Report Summary

  • 24

    Performance

    Renders faster than
    43% of other websites

  • 96

    Accessibility

    Visual factors better than
    that of 89% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 76

    SEO

    Google-friendlier than
    35% of websites

dro.hs.columbia.edu

Digital Reference of Ophthalmology | Vagelos College of Physicians and Surgeons

Page Load Speed

413 ms in total

First Response

130 ms

Resources Loaded

168 ms

Page Rendered

115 ms

About Website

Welcome to dro.hs.columbia.edu homepage info - get ready to check Dro Hs Columbia best content for United States right away, or after learning these important things about dro.hs.columbia.edu

The Digital Reference of Ophthalmology provides color images of entities encountered in ophthalmic practice. Learn more.

Visit dro.hs.columbia.edu

Key Findings

We analyzed Dro.hs.columbia.edu page load time and found that the first response time was 130 ms and then it took 283 ms to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster.

Performance Metrics

dro.hs.columbia.edu performance score

24

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value6.7 s

2/100

10%

LCP (Largest Contentful Paint)

Value11.4 s

0/100

25%

SI (Speed Index)

Value8.6 s

17/100

10%

TBT (Total Blocking Time)

Value1,120 ms

23/100

30%

CLS (Cumulative Layout Shift)

Value0.001

100/100

15%

TTI (Time to Interactive)

Value16.0 s

6/100

10%

Network Requests Diagram

dro.hs.columbia.edu

130 ms

index.gif

27 ms

Our browser made a total of 2 requests to load all elements on the main page. We found that all of those requests were addressed to Dro.hs.columbia.edu and no external sources were called. The less responsive or slowest element that took the longest time to load (130 ms) belongs to the original domain Dro.hs.columbia.edu.

Page Optimization Overview & Recommendations

Page size can be reduced by 1.9 kB (62%)

Content Size

3.0 kB

After Optimization

1.1 kB

  • HTML

In fact, the total size of Dro.hs.columbia.edu main page is 3.0 kB. This result falls within a vast category (top 1 000 000) of heavyweight, probably not optimized, and thus slow loading web pages. Only a small number of websites need less resources to load. HTML takes 3.0 kB which makes up the majority of the site volume.

HTML Optimization

-62%

Potential reduce by 1.9 kB

  • Original 3.0 kB
  • After minification 2.8 kB
  • After compression 1.1 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 1.9 kB or 62% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

1

After Optimization

1

  • Images

The browser has sent 1 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Dro Hs Columbia. According to our analytics all requests are already optimized.

Network Requests Diagram

Accessibility Review

dro.hs.columbia.edu accessibility score

96

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.

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

<frame> or <iframe> elements do not have a title

Best Practices

dro.hs.columbia.edu 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

General

Impact

Issue

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Page has valid source maps

High

Issues were logged in the Issues panel in Chrome Devtools

SEO Factors

dro.hs.columbia.edu SEO score

76

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

    ISO-8859-1

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Dro.hs.columbia.edu 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 Dro.hs.columbia.edu main page’s claimed encoding is iso-8859-1. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

Open Graph description is not detected on the main page of Dro Hs Columbia. 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: