IMac 3.06 dual core beachballing after disk repair

Can't get to the bottom of what's going on with my machine. It's very slow after start or wake-up, beachballs with lots of disk activity even when no apps are open. After twenty minutes or so everything seems OK, well nearly OK as it will still beachball a bit every so often.
I ran the disk repair utility after having the same symtoms a couple of weeks ago and it successfully repaired it.
Running permissions repair doesn't flag up anything unusual - core tasks and java which Apple indicate is normal. These show as repaired but if you run the repair again the same result appear.
Running the activity monitor doesn't seem to show any unusual activity. kernal_task consumes most of the real memory (around 300mb), mds uses the most virtual memory (400mb).
Any help very much appreciated as this driving me nuts.

The next time you have the problem, note the exact time: hour, minute, second.
If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Scroll back in the log to the time you noted above. Select any messages timestamped from then until the end of the episode. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.

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Message was edited by: TheB
Message was edited by: TheB

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Phanman08 wrote:
So my Macbook froze while playing Dragon Age Origins and i had to force shutdown. When i tried to reboot, it froze at the apple logo and then went to either a black screen or a grey screen. I then put in the install dvd and used the disk utility to repair it and it's booting properly now. However when I try playing Dragon Age or Starcraft 2 they are unplayably slow. I've tried resetting the SMC, the PRAM, and repairing the disk permissions to no avail.
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IMac 3.06 dual core beachballing after disk repair

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