Comdo Firewall is making my labtop very busy

after installing Comodo Firewall, I could see a lot of I/O write & reads traffic, CPU usage fluctuating between 17 & 20%some times, memory usage around CFP 27mb cmdagent 7mb, total virtual memory is 30mb. is there any way to avoid all of this, I can see my harddisk led falshing as my latop is on. if I exit your firewall then every thing is OK.
However, I am using NOD32 antvirus.

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It could be the logging feature thats causing this. Especially if you have a lot of traffic going on. Do you monitor and log a lot of actions?