Further since one or two weeks I have problems when replying on forum posts. It tooks a longe time while browsing the forum is fast.
I do have the problem on different Internet connections and routers/firewalls.
I've seen that too on occasion, did some checking into it with nothing found. Haven't had time to really dig into it. Felt like reverse DNS lookup delay, but I disabled that in SMF and it didn't change anything.