Thanks for your explanation @Chouf1 🙂
It is a managed server from german hoster strato.
I try to fix it since 2 days and got a big headache! 🙂 This site has really much images to load and the loading time for archive-pages go down to 1,1 sec from 2,0 since loading images from subdomain. Everything works fine except of bp members-loop and bbpress topics with more than 3 replies.
I will try to remove the subdomain and hope it works like bevor. It`s better all sites loading in 2,0sec instead of some loading very fast and some needs forever.
I have that sense it could be fixed but i do not get it!
