DC 2.0 , 1.5 Gb, 10.4.X,
I have a couple of 2 week old systems here and they experience random lag. The mouse will stop being responsive for a second or typing stops for a second. It seems totally random. I dont notice anything out fo the ordinary except for maybe iChat using 10% cpu when hidden.
I know its not much info to go on but I hope its a quick fix.
Thanks
J