Hazel pushing system to 100% every 5 mins

I have a g4 1.4ghz mac mini running hazel with 1 rule. The rule monitors a network drive looking for updates in the last hour and then adds any matches to iTunes.
The problem is the machine flies to 100% cpu usage every time it does a scan (seems like every 5 mins or so). Of course this generates lots of hear, the fans rev up etc. etc. I'm concerned it's putting undue stress on my machine.
Is this normal??
The problem is the machine flies to 100% cpu usage every time it does a scan (seems like every 5 mins or so). Of course this generates lots of hear, the fans rev up etc. etc. I'm concerned it's putting undue stress on my machine.
Is this normal??