[sork] My Forwardsis slowly

[Debian]

Hi,

I'm installed 

Horde: 2.2.5 
IMP: 3.2.4 (run IMP tests) 
Vacation: 2.2.1 
Forwards: 2.2.1

All is Ok but when I use forwards, it's very solwly, I clic on "Set/install
a forward to" and my password, Ok and after 5 minutes, my forward is enable.
It's same when i want to go back to delete my forward but when my forward is
desable it's very quickly.
I don't understand why is very slowly after the forward.....

Thank's for your help


Charles