System slows down in copying data

[Furqan <furahm2002@xxxxxxxxx>]

Hello
I am using linux-iscsi-5.0.0.0.3rc6-363 initiator in linux and 
iscsitarget-0.4.11 as a target. My target is set on a static ip on a system
that is located in other office. The target system is  AMD Opteron(tm)
Processor 248  with 8GB of ram and scsci drive as a target.  The initiator
machine is Intel(R) Pentium(R) 4 CPU 2.80GHz with 512MB ram.  When running
initiator in linux I am able to connect to target and mount the drive to
local system. But when I try to copy data to target the system slow down
such that I can run application but cannot get the output of keyboard keys,
if i am getting output of keys it is after long time. And after that also
the data is not being copied to target.  But when I try to copy data from
target to local system it copies but at very slow speed.  On the other hand
when I am running iscsi initiator on Windows I can copy data from local
system to target and vice versa, but in windows also the speed is too slow.
It takes 10 minutes to copy 30 MB of data. 
Please anyone can explain why is it so, or whether Iam doing any mistake.
In linux the configuration of iscsid file of initiator is as follow
node.active_cnx = 1
node.startup = manual
#node.session.auth.username = dima
#node.session.auth.password = aloha
node.session.timeo.replacement_timeout = 0
node.session.err_timeo.abort_timeout = 10
node.session.err_timeo.reset_timeout = 30
node.session.iscsi.InitialR2T = No
node.session.iscsi.ImmediateData = Yes
node.session.iscsi.FirstBurstLength = 262144
node.session.iscsi.MaxBurstLength = 16776192
node.session.iscsi.DefaultTime2Wait = 0
node.session.iscsi.DefaultTime2Retain = 0
node.session.iscsi.MaxConnections = 0
node.cnx[0].iscsi.HeaderDigest = None
node.cnx[0].iscsi.DataDigest = None
node.cnx[0].iscsi.MaxRecvDataSegmentLength = 65536
#discovery.sendtargets.auth.authmethod = CHAP
#discovery.sendtargets.auth.username = dima
#discovery.sendtargets.auth.password = aloha


 and configuration of ietd file of target is as follow
Target iqn.2002-12.com.eastti.iet:storage.disk1.iet
	# Users, who can access this target
	# (no users means anyone can access the target)
	# IncomingUser joe secret
	# Logical Unit definition
	# You must define one logical unit at least.
	# Block devices, regular files, LVM, and RAID can be offered
	# to the initiators as a block device.
	Lun 0 Path=/dev/sda
				# ,Type=fileio
	# Alias name for this target
	Alias Test
	# various iSCSI parameters
	# (not all are used right now, see also iSCSI spec for details)
	#MaxConnections		1
	#InitialR2T		Yes
	#ImmediateData		No
	#MaxRecvDataSegmentLength 8192
	#MaxBurstLength		262144
	#FirstBurstLength	65536
	#DefaultTime2Wait	2
	#DefaultTime2Retain	20
	#MaxOutstandingR2T	8
	#DataPDUInOrder		Yes
	#DataSequenceInOrder	Yes
	#ErrorRecoveryLevel	0
	#HeaderDigest		CRC32C,None
	#DataDigest		CRC32C,None
	# various target parameters
	#Wthreads		8

I have checked iscsi on LAN network it is working fine but on internet it is
not giving performance in Windows and output in Linux
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