I use the week view calendar view all time on my ipad and iphone. I have about 5 calendars showing at any given time... 4 subscribed calendars, and one Exchange. When looking at the week view in landscape mode the calendar starts to flash and get real slow and choppy. It locks ups for periods of 5-10 seconds at a time while I can't do anything, can't scroll or move or open an event. I'm running the latest ios7.0.3 on my ipad 4th gen. The same thing happens to me on my iphone. I didn't have this issue in ios6. Anyone else experiencing this???