After upgrading to 10.5.4, CPU keeps maxing out and system runs slower

Hi there,
I upgraded to 10.5.4 last week and quite frequently my CPU starts revving up and stays at a high level until I put my iMac to sleep. When I did my weekly reboot last Friday it seemed to not have the problem for a while, but then it came back again pretty quick. By checking Activity Monitor I found out that my resources are maxed out all the time, I've got about 80% CPU attached to Safari right now. Applications seem to load slower, everything runs a bit slower when it's like this.
I found under System Preferences > Energy Saver that I had my Processor Performance set to Highest, so I switched that to Automatic, but I'm still having this problem.
Can anyone help me with this?
Travis

Thank you, Pondini, that's all I was really asking about in the 3 (4) previous messages. I wanted to know if I could download the combo updater and install it over top of the 10.5.4 version I downloaded through Software Update. Thanks for the confirmation. I did download it this morning after getting your post and have installed it.
Initially, after installation and reboot of the combo update 10.5.4, my CPU maxed out again for a little while, and I checked Activity Monitor and it said a program called "Pattern ?" was hogging the CPU, the ? refers to a second word that I didn't write down at the time, I think it started with the letter M.
I had my iMac turned off for a couple hours after that. When I turned it back on, I was ripping 4 CD's into iTunes and so it sounded like the CPU was running high again through that, but I think that's typical for when I'm ripping a CD. Anyhow, right now the CPU is running normal, about 20% of total cycles used and that Pattern ? whatever program has disappeared from the list. So maybe that was something that the Combo Updater 10.5.4 was using to fix a problem and it might be back to normal again.
So, so far so good, thanks to the people here who have helped. I will post again if the problem persists.
Also, Pondini, thanks for reminding me to check posts in the forum for information. I almost always do that initially, before I post my question. I did that this time, but I had no idea at the time that downloading the combo updater would be the solution as I was scanning the forum for people who had spiking CPU's, not any other type of problem. I suppose in hindsight, after finding that combo updater might be a possible solution to my problem I should have ended this thread and sought new information, posed a new question / post if necessary. But like you say, I would have found other posts about installing combo updater.
Travis

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