Our detectives are back with the following intel on this WordPress site
The site is using the Hartwall.fi 2015 theme by Bob the Robot .
We could identify 2 plugins (there might be more) -
Better WordPress Minify
W3 Total Cache
This information was last updated 15 April, 2017
Allows you to combine and minify your CSS and JS files to improve page load time.
Search Engine (SEO) & Performance Optimization (WPO) via caching. Integrated caching: CDN, Minify, Page, Object, Fragment, Database support.