Accessing iTunes and iPhoto from Time Capsule. Which Mac should I get?

My iTunes and iPhoto libraries are housed in Time Capsule. Thus far, this has been very labor-intensive for my 4.5 year old Macbook. I plan to buy an new Mac but unable to decide which machine: 13" Air (possibly w/ 8GB RAM) or 13" Pro? Can Mac Air handle accessing these files easily with its limited processor? thank you

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