I have been using Virtualmin/Webmin for some weeks now and I find it to be the perfect CPanel alternative.
Yesterday I have installed mod_pagespeed and noticed the difference right away with sites loading faster, there is an issue though with roundcube.
When I login to roundcube, no matter what virtualhost, the messages simply didn`t show and the interface itself was irresponsive.
I then turned mood_pagespeed OFF and the issue was solved.
I also notice that with mood_pagespeed ON and accessing roundcube via https everything was normal.
I have then made a redirect from http to https for rouncube page so that I can still use mood_pagespeed.
I wonder if anyone knows if there is a setting on mood_pagespeed or even httpd that solves this issue.