i'm using IDS 4235 running IPS 5.1(5) with 4 Fast Ethernet card.when running in inline mode with default signature configuration it slows down all internet activities (I connected to the internet via 2M SHDSL).i don't know what is wrong ....??

I'm using IDS 4235 running IPS 5.1(5).in inline (connected directly with outside router) mode with 4 FE card.i noticed that it slowed down my network very much (my internet connection is 2M SHDSL) even when no configurations but the default one is ap...