Access cog-uk.io. Real-Time Epidemiology for COVID-19 – Centre for Genomic Pathogen Surveillance

cog-uk.io

224 ms

717 ms

wp-emoji-release.min.js

274 ms

style.min.css

356 ms

style.css

288 ms

Our browser made a total of 59 requests to load all elements on the main page. We found that 2% of them (1 request) were addressed to the original Cog-uk.io, 78% (46 requests) were made to Pathogensurveillance.net and 14% (8 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (2.1 sec) relates to the external source Pathogensurveillance.net.

Content Size

572.2 kB

After Optimization

404.6 kB

In fact, the total size of Cog-uk.io main page is 572.2 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. 55% of websites need less resources to load. Javascripts take 200.7 kB which makes up the majority of the site volume.

HTML Optimization

-80%

Potential reduce by 56.0 kB

Original 69.7 kB
After minification 69.7 kB
After compression 13.7 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 56.0 kB or 80% of the original size.

Image Optimization

-16%

Potential reduce by 23.2 kB

Original 144.7 kB
After minification 121.6 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, Cog Uk needs image optimization as it can save up to 23.2 kB or 16% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-27%

Potential reduce by 53.5 kB

Original 200.7 kB
After minification 200.7 kB
After compression 147.2 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 53.5 kB or 27% of the original size.

CSS Optimization

-22%

Potential reduce by 34.9 kB

Original 157.1 kB
After minification 157.1 kB
After compression 122.2 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. Cog-uk.io needs all CSS files to be minified and compressed as it can save up to 34.9 kB or 22% of the original size.

Requests Now

After Optimization

The browser has sent 43 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Cog Uk. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 19 to 1 for JavaScripts and from 17 to 1 for CSS and as a result speed up the page load time.