I have run your site though a http2 check:
https://tools.keycdn.com/http2-test
As your sites support http2, you should not have minify enabled
When loading a website from an HTTP1.1 server, A single request is processed at a time. therefore, the browser will first download the CSS, then another CSS, then another JS. At the end of the download process, the pages will be rendered. This happens one after another, until all assets are loaded on the page. A single HTTP request on an HTTP 1.1 based server will always load quicker than multiple, as there is no waiting period.
With HTTP 2, All requests load at the same time. There is no waiting and there are the same number of connections for the number of assets being requested. Therefore, merging and minifying creates a larger file which then takes longer to to upload and download, leading to a longer render process for the website. By keeping all of the individual files un-merged and un- minified they can all load at the same time.
