It's not just you. It's known as shutter lag, and it exists in pretty much all phones and "point and shoot" style digital cameras to varying degrees. Has to do with how fast the firmware in a given device registers a tap or a button press and triggers the shutter to activate. Sometimes it's also because your display image is a rough focus and the camera does a final autofocus as you trigger the shutter, and that causes lag depending on how good the software behind it is. It was the primary reason I moved to a DSLR from a p/s camera way back when.
Yup. This isn't an OS thing. It's platform agnostic.
