What are the specs of the iMac?
What type of apps are you running and which in particular seem more speedy on the G5?
Older programmes may indeed run slower if they are still using PPC (non-intel) code, such as old verisons of Photoshop. As your iMac will be "translating" the programme to Intel code to allow it to run.
I am not sure what you level of Mac or IT knowledge is so i have kept things pretty basic.
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