Performance losings with iptables

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Hello,
i use iptables with Debian-Linux (2.4.20).
Wenn i install 150 Input-Chains like this:
iptables -A input -s 192.168.81.xxx
i will lose a lot of perfomance (for example: apache take a lot of time, ssh ...)
Wenn i show the perfomance with vmstat - vmstat says that 99 % is idel...
Wer is the Problem ???
 
Thanks for helping ... Michael

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