So, I've had my D7100 for about a month or so now. I'm really noticing how it's brain seems to be a slower thinker. What I mean by this is that i'm finding that as I take photos, the camera sometimes wont shot if im shooting too fast for it. Like example. I was trying to capture my two year old and she was moving around heap so I was taking a photo fairly quickly one after the other, but then it started to do nothing when I hold the shutter button down and so I end up missing a heap of shots before it 'catches up' and starts taking photos again. I'm guessing the problem is that it's trying to process the photos as the green light stays on for ages and then turns off. I also can't view the photos on the screen until it finished thinking too. I never had this problem with my D3100! I tried switching lens to see if it helped but it didn't. It does this in single and continuous modes.

Does anyone know why its being so slow and how can change/fix it?