Very slow DFSR on Windows Server 2008

We need to have distributed file system between two location.
I evaluating possibility to use DFS and two Windows Server 2008 to do it.

I set up two computer with clean installation of system.
The test is on two local subnets, so speed should not be an issue.
Each server is defined in separate logical site.

The DFSR folder I create on one server has 50 GB / 40,000 files.
The initial replication still is not finished after couple of days.
The transfer speed is only about 5kB/s and 3 files / min.
I increase staging quote to 100GB, so it should not be a limit.

I also make simple test of speed between both servers.
I create shared folder on both servers and manually copy files.
The transfer speed is reasonable 5 MB/s (1000 time faster that DFSR).

There is no processor load on servers (0% CPU).
This is test before real use so server do almost nothing else.
The event log shows sometimes 5014 but followed immediately with 5004.

Does anybody have an idea what is wrong?