Concerns about Macbook Pro 13's integrate graphics card

Good evening,

A similar topic has been posted on the Macbook Pro hardware section - if you believe its more suitable there I'll cease this one.

I am about to purchase a laptop and the Macbook Pro 13 i7 is top on the list, however it does not have a dedicated graphics card.

Will this negatively impact on performance for Adobe Lightroom? In future I would also like to do more stitching and HDR editing - potentially using Photoshop. Will a dedicated card be beneficial in these scenarios.

I'm using a Nikon D7000, working with RAW files of 20-25Mb each.
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