Analyze Ensembl genome browser 101

Page load speed analysis

  • 59/100

    Normal result
  • 6

    Successful tests
  • 2

    Failed tests
  • First response

    336 ms

  • Resources loaded

    2.9 sec

  • Page rendered

    182 ms

  • Total page load time

    3.4 sec

Click here to check amazing Ensembl content for United States. Otherwise, check out these important facts you probably never knew about

We analyzed page load time and found that the first response time was 336 ms and then it took 3.1 sec to load all DOM resources and completely render a web page. This is a poor result, as 50% of websites can load faster.

Page optimization

  • HTML 53.0 kB
    Images 884.6 kB
    Javascripts 763.0 kB
    CSS 254.1 kB

    In fact, the total size of main page is 2.0 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 45% of websites need less resources to load. Images take 884.6 kB which makes up the majority of the site volume.

    • Original 53.0 kB
    • After minification 49.5 kB
    • After compression 11.1 kB

    HTML optimization

    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 41.8 kB or 79% of the original size.

    • Original 884.6 kB
    • After optimization 867.4 kB

    Image optimization

    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. Ensembl images are well optimized though.

    • Original 763.0 kB
    • After minification 763.0 kB
    • After compression 234.3 kB

    JavaScript optimization

    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 528.7 kB or 69% of the original size.

    • Original 254.1 kB
    • After minification 253.9 kB
    • After compression 78.0 kB

    CSS optimization

    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. needs all CSS files to be minified and compressed as it can save up to 176.1 kB or 69% of the original size.

Network requests diagram

  • index.html
  • c5d3e910a7d41271091f321670ff6255.css
  • 9e5fb866ea5d8e4b2a686605ac218e47.image.css
  • c1abd10076e4fe935734f5770cb66318.js
  • 8331e5348dbe9e115a00aea02c2ce595.js
  • 9b4333c48659ba022dc34458e46acb34.png
  • a0986ee1fa08dd655721db906739ca57.jpg
  • cdc31f372fd4b641fbf8e57fac742d42.png
  • widgets.js
  • timeline.1b43d11859b7663a2225b885f87704a5.js
  • analytics.js
  • accounts_dropdown
  • piwik2.js
  • bx_loader.gif
  • controls.png
  • syndication
  • 490156138512396288
  • linkid.js
  • collect
  • timeline.4d087f49a21e27038d9769d7c976b8fa.default.css
  • CropperCapture577.png
  • CropperCapture570.png
  • Homo_sapiens.png
  • Mus_musculus.png
  • Homo_sapiens-e1438860291690.png
  • timeline.4d087f49a21e27038d9769d7c976b8fa.default.css
  • piwik.php
  • c78866538728fa858fac76b5a3ce0424_normal.png
  • mrr_caricature_normal.jpg
  • f3440ef862fb192536702911df40825c_normal.png
  • CcI4K0bW0AIy8z2.jpg:small
  • CcFO2ZSW0AAx4qy.png:small
  • jot

Our browser made a total of 34 requests to load all elements on the main page. We found that 15% of them (5 requests) were addressed to the original, 26% (9 requests) were made to and 15% (5 requests) were made to The less responsive or slowest element that took the longest time to load (1.1 sec) relates to the external source

Additional info on


The browser has sent 32 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Ensembl. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 7 to 1 for JavaScripts and from 4 to 1 for CSS and as a result speed up the page load time.











Possible request optimization













Normal result


As for redirects, our browser was forwarded to /index.html before it reached this domain.

IP address uses IP addresses which are currently shared with 8 other domains. The more sites share the same stack of IP addresses, the higher the host server’s workload is. It is strongly recommended that the host server should be changed or the hosting provider should be requested to give a different (separate) IP address for this domain.

Normal result

IP Trace

DNS records

Type Host Target/ip TTL Other
A 600
A 600
NS 3600
NS 3600

600 Mname:
Serial: 2020071501
Refresh: 28800
Retry: 7200
Expire: 604800
Minimum-ttl: 600

Language and encoding

Normal result


EN en language flag


EN en language flag





Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise 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 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.

HTTPS certificate

SSL Certificate has no SSL certificate. Web browsing can be safer with HTTPS connection, so we suggest that it should be obtained for this site.

Normal result

Visitor World Map

Country of origin for 63.1% of all visits is United States. It lies approximately 4470 miles away from the server location (United Kingdom) and such a long distance can negatively affect website speed, as it takes some time for data to travel back and forth between those places. That’s why one of the best ways to speed up page load time for the majority of users is moving the server to United States or just closer to the user base.

Poor result

Poor result

Social Sharing Optimization

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

Share this report in social media

Analyze another website