I have a PB G4 Rev D (1.67, 2gb ram, 128 vid) that is just over 3 years old. I have the latest release of Tiger running on it. Just prior to updating I noticed that while downloading from iTunes or the internet whether the file is 1gb or 60 gb my computer lags. The download doesn't but I can't really use the mouse as it just stalls. When I can get it to move I click on something else (another window) and it takes a few moments to register. I updated to the latest release of Tiger in hopes that fixed everything, no dice. I hooked my computer directly to the internet, no dice. Finally I checked to see that everything was working (hard drives (verify/repair, hardware, software, ram slots) and everything seems to be in order. This being a new development I'm lost. I am about 12 days out of Apple Care and would like this machine to last about another 3 months until I get back from my East coast trip. Does anyone know what could cause this or what else can be done to perhaps fix the issue?