VirtualBox 4.2 - slow bridged network

[Marek Salwerowicz]

Hi,

My host is FreeBSD 9.1 with 2 NICs (em0 and bge0), connected to 1Gbit LAN
VirtualBox 4.2

I am using the bridged network model:

VBoxManage modifyvm $VMnam  --boot1 net --nic1 bridged --nictype1 
$NICTYPE --bridgeadapter1 bge0

I've tested the following NIC types:

NICTYPE="Am79C973" #OK,
NICTYPE="Am79C970A" #OK
NICTYPE="82540EM" # OK
NICTYPE="82543GC" #
NICTYPE="82545EM" #

With all types I have only ~500KB/s of transfer

When I download the same file to host machine, my transfer is much 
faster (around 30-40 MB/s)
The same for Intel adapter (em0)

Is there any possibility to speed up the bridged adapter ?

-- 
Marek Salwerowicz