Modern i5 processors are fairly zippy and efficient. I do not know much about the i3 (I assume you mean the current Core i3 CPU), but here is a CPU comparison article from last year that might shed some light on the matter for you:
Modern i5 processors are fairly zippy and efficient. I do not know much about the i3 (I assume you mean the current Core i3 CPU), but here is a CPU comparison article from last year that might shed some light on the matter for you: