There's going to wide variation in latency/lag time depending on the brand and model of the tablet you're using -- the speed of the "network" depends on this as well as the camera. An acquaintance at Google suggests that there may be enough of a difference between the Apple and Android Canon apps to make a noticeable difference; as for hardware, the processor speed and its architecture as well as a list of things unknown to me, play their part. Any experts in the house?!
What (current) make & model are you using, and how's it doing? Can you compare across platforms?
If I owned a 6D my special interest would be in mounting a tablet from a base plate on a flexible arm in order to compose and focus manual-only lenses in live view. How large is your live view area within the Canon app?
For reference, Jeff at the "OK-Canon" center scared up what he called an "iPad3" and measured the live view picture at 5" x 4 in landscape, with no cropping he could spot, although the aspect ratio is a little off. He said some controls were in dead space to the left and right, though if you called up more these slopped onto the live view image about 1/2" on either side.