IMac is running so SLOOOOOW...

Question

I migrated my girlfriend's G3 iBook (10.4) to her new Intel iMac and the machine's been running inexcusably slow, whether it's native or non-native apps. She's got MS Office and Photoshop 7 on there--obviously they run a bit slow and crash now and then, but native things like clicking on the Finder window gives me a long lag.
I've repaired permissions, rebooted, resolved font duplicates and it's still very slow.
Any tips?

Answer 1

Ditto. This is running slower than my old G4.
I initially bought a G5 iMac, and then with the new one came out 4 days later "upgraded" to the Intel. So far, I haven't seen any evidence that was the right decision.
I understand some programs are going to run slow, but what I can't understand is why finder is dragging (particularly seems to occur when I wake the machine up from sleeping). Simple things like close/open window make me wait 4 or 5 seconds, and it's frustating. I've repaired permissions and run Applejack, and the thing is still slow. Perhaps more memory would help, but I'd like to hear that first hand from somebody who had the problem and then cured it by adding memory before I blow more money on this thing.
iMac 17" Intel   Mac OS X (10.4.5)