Hi again
Thanks Andrew, Mark and Brett for trying to help.
We have now recieved help from Ruairi Prendiville. He found that if we increased the size of Network packages from 2048 to 65024 and the number of pre-allocated extents from 2 to 32, we got very good speeds again. We also changed our device usage from one 700GB device (located on SAN with extreem IO flashdisks), to chunks of 50GB devicefiles (located on the same SAN). I don't know if the device change made mutch diffence, but we are now happy with the speed of bcp in again.
Regards
Pål