Help with slow site and javascrips

Any chance of some help with performance on our educational devsite that is getting slow? https://developers.google.com/speed/pagespeed/insights/?url=www.afff.se
We have many plugins in there but none that are not doing something important...
Would be great to at least get to decent speed in drawing pages even if it only dev
as we are about to do some real world testing...
thanx
j