Report Summary

  • 68

    Performance

    Renders faster than
    80% of other websites

  • 91

    Accessibility

    Visual factors better than
    that of 76% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 100

    SEO

    Google-friendlier than
    94% of websites

omim.org

Home - OMIM

Page Load Speed

2.7 sec in total

First Response

724 ms

Resources Loaded

1.8 sec

Page Rendered

183 ms

omim.org screenshot

About Website

Welcome to omim.org homepage info - get ready to check OMIM best content for China right away, or after learning these important things about omim.org

Online Mendelian Inheritance in Man (OMIM) is a comprehensive, authoritative compendium of human genes and genetic phenotypes that is freely available and updated daily. The full-text, referenced over...

Visit omim.org

Key Findings

We analyzed Omim.org page load time and found that the first response time was 724 ms and then it took 2 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

omim.org performance score

68

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.2 s

42/100

10%

LCP (Largest Contentful Paint)

Value4.3 s

41/100

25%

SI (Speed Index)

Value3.7 s

85/100

10%

TBT (Total Blocking Time)

Value350 ms

73/100

30%

CLS (Cumulative Layout Shift)

Value0.001

100/100

15%

TTI (Time to Interactive)

Value4.3 s

84/100

10%

Network Requests Diagram

omim.org

724 ms

analytics.js

31 ms

plusone.js

94 ms

screen.css

159 ms

text.css

159 ms

Our browser made a total of 31 requests to load all elements on the main page. We found that 84% of them (26 requests) were addressed to the original Omim.org, 6% (2 requests) were made to Google-analytics.com and 6% (2 requests) were made to Apis.google.com. The less responsive or slowest element that took the longest time to load (724 ms) belongs to the original domain Omim.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 275.9 kB (62%)

Content Size

446.0 kB

After Optimization

170.1 kB

In fact, the total size of Omim.org main page is 446.0 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. 25% of websites need less resources to load. Javascripts take 319.7 kB which makes up the majority of the site volume.

HTML Optimization

-83%

Potential reduce by 24.1 kB

  • Original 29.1 kB
  • After minification 18.9 kB
  • After compression 4.9 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 10.2 kB, which is 35% 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 24.1 kB or 83% of the original size.

Image Optimization

-11%

Potential reduce by 5.4 kB

  • Original 47.1 kB
  • After minification 41.7 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, OMIM needs image optimization as it can save up to 5.4 kB or 11% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-64%

Potential reduce by 205.0 kB

  • Original 319.7 kB
  • After minification 311.5 kB
  • After compression 114.8 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 205.0 kB or 64% of the original size.

CSS Optimization

-83%

Potential reduce by 41.3 kB

  • Original 50.1 kB
  • After minification 41.0 kB
  • After compression 8.7 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. Omim.org needs all CSS files to be minified and compressed as it can save up to 41.3 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 17 (59%)

Requests Now

29

After Optimization

12

The browser has sent 29 CSS, Javascripts, AJAX and image requests in order to completely render the main page of OMIM. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 14 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Accessibility Review

omim.org accessibility score

91

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

Buttons do not have an accessible name

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Best Practices

omim.org best practices score

75

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

Page has valid source maps

SEO Factors

omim.org 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 Omim.org 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 Omim.org 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 description is not detected on the main page of OMIM. 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: