any antivirus and firewall will not reduce bittorrent speed

I tried many firewall and anti virus have built in firewall
my experience is every firewall reduce download speed
bitdefender even block traffic of both IDM and utorrent
despite disable its firewall option , download not even starting

If it's blocking means then why don't you move that application into Trusted option. I use KIS 2009/NIS 2008. I havn't faced any problems.

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Originally Posted by aaggie_john

I tried many firewall and anti virus have built in firewall
my experience is every firewall reduce download speed
bitdefender even block traffic of both IDM and utorrent
despite disable its firewall option , download not even starting

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try zone alarm

Yeah, zone alarm is a good option :)

why don't you use utorrent, it automatically integrate with your firewall and router

Eset never seems to harm my speeds .

I used Outpost and Comodo and it didn't harm my download/upload speed too.
May be you just configure your firewalls wrong.