I'm thinking to get an iPad Pro this summer. It'll be my main device for media, games, surfing web and mostly drawing. I'll use it quite much everyday. I'm hearing that charging time is 4 hrs from 0 to 100. Are there any ways to make it quicker? I know the 12.9 has the quick charging option through additional accessories, but I don't wanna go up to the price that I can instead buy a rMBP. And one more question, can it charge while using it on around 50% brightness?